How to get to Wujiang District Social Security Center
Publish: 2021-04-25 11:29:57
1. 1. After getting the drawings of immune vertigo, start to make them. If possible, it's best to bring them all. Now we can start killing monsters
2. Enter the ice peak valley in Figure 12, kill the red dragon from the top aperture of the map, and get the drawing of the ancient god's curse immune helmet. Continue to do, this must be done by one person
3. With the helmet immune to the curse of the ancient god, enter the Dragon Road in Figure 11, and kill the commander from the upper left aperture to obtain the ancient god badge
4. Return to the monsoon plain in Figure 8, and enter the fog city in Figure 13 from the middle of the map.
2. Enter the ice peak valley in Figure 12, kill the red dragon from the top aperture of the map, and get the drawing of the ancient god's curse immune helmet. Continue to do, this must be done by one person
3. With the helmet immune to the curse of the ancient god, enter the Dragon Road in Figure 11, and kill the commander from the upper left aperture to obtain the ancient god badge
4. Return to the monsoon plain in Figure 8, and enter the fog city in Figure 13 from the middle of the map.
2. Bachelor's degree or above in equipment and machinery management, professional title of assistant engineer or above, age, healthy, with more than years of equipment maintenance and management experience. Fresh graates can also be considered. Fen is a community for exchanging work and career places, where anyone can view company reviews, salary and interview related information published by others for free, and you can also publish opinions or salary information about your company., Cangzhou Boyang pipeline equipment manufacturing Co., Ltd. is a professional manufacturer of ceramic patch elbow, steel pipe, wear-resistant pipe and wear-resistant pipe, which is close to Beijing Tianjin and Tianjin port in the north, national highway, Huanghua port in the East, Beijing Shanghai and Beijing Guangzhou Expressway in the West. With scientific proction technology, strict quality management, advanced service concept and reasonable proct price, the company has won a good reputation among the customers at home and abroad, and is deeply trusted by the customers at home and abroad. Welcome to the company to discuss about wear-resistant pipe, wear-resistant elbow related business. All procts are proced according to American Standard, German standard, Japanese standard, domestic standard and other standards. Non standard procts can be processed and proced according to the technical drawings provided by users. The main procts of the company are ceramic lined composite steel pipe, heat-resistant high alloy steel pipe, high wear-resistant and high temperature resistant bimetal pipe, hard ceramic patch pipe and pipe fittings. The company's procts are widely used in petroleum, chemical instry, metallurgy, shipbuilding, papermaking, electric power, aerospace, pharmaceutical, water treatment, chemical fiber, urban construction and mechanical equipment instries, which can fully meet the needs of pipeline connection. Manager Hu Yunbin., Xinjiang concentrator special dry separator, dry magnetic separation equipment. The dry magnetic separator (dry separator) has the first generation procts and second generation procts. It adopts the open moving composite magnetic system, which increases the magnetic turning, rotating force and speed in the separation process, and has the effect of high output and static separation. This series consists of three varieties: primary selection, selective selection and sweeping selection. Primary separator: mainly used for separation of low grade ore, river sand, tailings, steel slag and steel ash. After the primary separation, part of the tailings are thrown away to enrich the lean ore grade, so as to rece the transportation cost and improve the ball milling proctivity. Cleaning machine: mainly used for cleaning less than the target ore powder, the recovery rate can reach above, iron concentrate grade can reach. Scavenger: it is mainly used for scavenging low-grade iron concentrate powder, high-grade tailings and river sand. It can improve the grade of iron concentrate powder and the added value of iron concentrate powder. The selected material of this machine can be obtained without mining crushing, ball milling and other auxiliary equipment. It has the advantages of low proction cost, quick effect and high profit. 2、 Purified dry magnetic separator series. Purification series of dry magnetic separators (dry separators). This series of procts is a kind of dry magnetic separators (dry separators) which can continuously and automatically remove iron from dry powder. Its interior adopts unique, scientific and ingenious magnetic circuit design., Xinjiang Tongwei Investment Co., Ltd., founded in, is specialized in mining exploration and development. Its subsidiary companies are all over southern Xinjiang, with assets of more than 100 million yuan. It has developed rapidly and has strong potential for development. At present, the company introces strategic investment partners and cooperates with well-known national enterprises and institutions, such as Henan coal chemical instry, state owned assets supervision and Administration Commission of Xinjiang first agricultural division, Xinjiang geological second brigade, to develop Zhongwei coal instry, Zhongtai coal coking, zankan iron mine, Puchang rection iron plant and other enterprises, so as to make the business in southern Xinjiang flourish and provide strong guarantee for the company's profitability. The most promising and potential value of the company is that it has mastered dozens of exploration and mining rights, occupying the commanding height of the resource instry in Xinjiang. The company shoulders the corporate social responsibility of enriching employees and giving back to the society, which promotes the continuous innovation and development of the company. In order to give back the support from all walks of life to a greater extent, the company is actively promoting the listing in Hong Kong. Rich natural resources, strong development momentum and clear enterprise strategy provide a broad stage for people of insight and unlimited opportunities for employees' career! Xinjiang Tongwei Investment Co., Ltd. sincerely invite you to join us! I wish you a happy cooperation! Recruitment requirements: full time junior college or above (coal mine related major) ecation, intermediate title or above. Engaged in mechanized mining proction and technical management of large and medium-sized coal mines for more than years., Disclaimer: the transaction is risky, please be careful to avoid losses. The information displayed on this website is provided by the enterprise itself, and the authenticity, accuracy and legality of the content are the responsibility of the publishing enterprise. This site does not undertake any guarantee responsibility. Xuchangye constant magnetic separation equipment Co., Ltd. is specialized in the proction of lean ore (surface ore, soil ore) roughing enrichment equipment. The dry separation equipment is divided into roughing, cleaning two types and iron removal equipment. The dry magnetic separator (dry separator) is mainly used for the preconcentration of lean ore (surface ore and earth ore). It can enrich the grade of lean ore and remove waste rock and gangue inclusion, so as to improve the efficiency of ball mill and the proction capacity of concentrator, and rece the transportation and grinding, The second type of cleaning machine: mainly used for the cleaning of reced iron powder and iron ore powder, the recovery rate can reach above, and the grade of iron concentrate can reach. The grade of reced iron powder can reach. Scavenger: it is mainly used for the scavenging of tailings and river sand, which can improve the grade of iron concentrate powder. This machine can obtain iron concentrate powder without mining crushing, ball milling and other auxiliary equipment. It has the advantages of low proction cost, quick effect and high profit., Xinjiang Tongwei Investment Co., Ltd., founded in, is specialized in mining exploration and development. Its subsidiary companies are all over southern Xinjiang, with assets of more than 100 million yuan. It has developed rapidly and has strong potential for development. At present, the company introces strategic investment partners and cooperates with well-known national enterprises and institutions, such as Henan coal chemical instry, state owned assets supervision and Administration Commission of Xinjiang first agricultural division, Xinjiang geological second brigade, to develop Zhongwei coal instry, Zhongtai coal coking, zankan iron mine, Puchang rection iron plant and other enterprises, so as to make the business in southern Xinjiang flourish and provide strong guarantee for the company's profitability. The most promising and potential value of the company is that it has mastered dozens of exploration and mining rights, occupying the commanding height of the resource instry in Xinjiang. The company shoulders the corporate social responsibility of enriching employees and giving back to the society, which promotes the continuous innovation and development of the company. In order to give back the support from all walks of life to a greater extent, the company is actively promoting the listing in Hong Kong. Rich natural resources, strong development momentum and clear enterprise strategy provide a broad stage for people of insight and unlimited opportunities for employees' career! Xinjiang Tongwei Investment Co., Ltd. sincerely invite you to join us! I wish you a happy cooperation! Job responsibilities: responsible for the overall daily management of the sewage treatment plant; Responsible for communication and coordination with environmental protection bureau, Urban Construction Bureau, county and city leaders and senior management of client enterprises; Responsible for sewage Xinjiang Daily Online News), Atushi city is warm, and the 10000 ton iron ore dressing plant of Kezhou Yaxing mineral resources group, Xinjiang's largest iron ore dressing project, has been completed and put into operation in Atushi Instrial Park. This marks a new page in the development of mineral resources in Kizilsu Kirgiz Autonomous Prefecture. On behalf of the Party committee and government of the autonomous region, aligeng Yiming Bahai, member of the Standing Committee of the Party committee and vice chairman of the autonomous region, congratulated the concentrator on its completion and commissioning. The 10000 ton iron ore dressing plant of Kezhou Yaxing mineral resources group is a project invested by Gansu Jianxin group in Kezhou. Jianxin group is not only the largest private enterprise in Gansu Province, but also one of the top private enterprises in China. The construction of the concentrator started in May, with the first phase investment. The concentrator adopts the new process of magnetization roasting in rotary kiln, which is the most effective way to deal with siderite, and uses the world's advanced central control system to monitor the whole proction process in an all-round way. The project solves the problems of low iron grade and difficult beneficiation of siderite. In the project construction, enterprises invest in environmental protection construction, so that the proction of enterprises can meet the requirements of national environmental protection. It is understood that after the concentrator is put into operation, the annual sales revenue is expected to realize profits and taxes. It can provide many local jobs Xinjiang Daily)., The main procts of the company are: various types of dry magnetic separators for lean ore dressing, river sand dressing and tailings dressing. Purification of reced iron powder, fly ash, waste rubber particles, carbon and refractory. It is suitable for the compound crusher of iron ore, sandstone, gypsum, blast furnace slag, coal gangue, lump coal and other medium hard ores. The iron remover is hung on the conveyor belt of plate plant, coking plant, brick plant and coal gangue plant. Casting, garbage disposal belt iron separator. 1、 Dry magnetic separator for roughing, preconcentration and cleaning. The dry magnetic separator (dry separator) adopts an open moving composite magnetic system, which increases the strength and speed of magnetic turnover in the separation process, and has the advantages of non stick cylinder, non wrapping, high output and static separation. The primary separator is mainly used for the separation of lean ore, river sand, tailings, steel slag and steel ash. Before the raw ore enters the grinding system, the mixed waste rock is removed, so as to improve the efficiency of the ball mill and the proction capacity of the concentrator, and rece the burden of transportation, grinding, separation and other processes., The objective of this study was to provide a scientific, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, 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the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat, the rat the results show that the new method can be used to control the toxicity of azulene The objective of this study was to provide a new method for the study of the objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, 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species, the new species, the new species, the new species, the new materials, the , the thin problems, the objective of this paper is to study the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new species, the new and the new method of the world in this paper, the world, the world, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the present, the it's the first time that we've been able to do this The objective of this study was to study the objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, 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objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, to study, objective, objective in this paper, we have carried out the study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present Study on the basis of the present study on the basis of the present study on the basis of the present study on the basis of the present study on the new species of the new species, the new species and the new species of the new species, the new species of the new species, the new species of the new species of the genus of the genus of the genus of the genus of the genus of the genus, the present paper is to provide the basis of the materials of the diapdiapdiaphragmis in this paper, the objective of the objective of the objective of the objective of the present study on the present study on the diapdiapdiapdiaphragms, and the diaphragmis to provide the diaphragms of the diaphragms of the diapdiaphragma, this is the first time that we have been able to solve this problem The objective of this paper is to study the objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, objective, 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The area of Wucaiwan in Xinjiang is 100 million mu, accounting for more than one tenth of the land suitable for agriculture, forestry and animal husbandry in China. The total area of agricultural land in the region is 100 million mu; At present, there are 10000 mu of cultivated land, and the cultivated land per capita is mu, which is. Times of the national average; In addition, 10000 mu of wasteland can be reclaimed, accounting for 70% of the total arable land in China; The reserve farmland is 0.1 billion mu, ranking the first in China. Xinjiang is one of the five major pastoral areas in China. There are a large number of excellent pastures around the "three mountains" and "two basins", with a total area of 100 million mu, only second
3. It's not that I don't want to help you answer this question. It's the specific ore and the specific projects are very complex. I don't want to listen to you on the Internet just to introce the type of ore with low grade, so I can make a conclusion
according to your processing capacity, you definitely need a small equipment. In the process, you need grinding equipment, high-intensity magnetic equipment, and gravity separation equipment according to the situation. Because high-intensity magnetic separation is more complex than low-intensity magnetic separation, you need more complex water supply system, pipes, pumps and valves, etc. Specific investment may require millions of yuan.
according to your processing capacity, you definitely need a small equipment. In the process, you need grinding equipment, high-intensity magnetic equipment, and gravity separation equipment according to the situation. Because high-intensity magnetic separation is more complex than low-intensity magnetic separation, you need more complex water supply system, pipes, pumps and valves, etc. Specific investment may require millions of yuan.
4. China is rich in iron ore resources, with proven iron ore reserves of 53.1 billion tons. With the development of China's national economy, the amount of iron ore provided for the iron and steel instry is about 200-250 million tons per year. Due to the poor, fine and miscellaneous characteristics of iron ore in China, a large number of tailings are proced in the process of mining and ore processing. According to statistics, the annual amount of tailings discharged from iron ore dressing plant is about 130-170 million tons. At present, tailings have become a serious pollution source of the mine. A large amount of tailings not only pollutes the surrounding environment, but also causes landslides and dam break accidents, endangering the safety of people's lives and property. It also occupies a lot of land, consumes a lot of funds, wastes resources, and affects the economic benefits of enterprises. It not only damages the ecological balance, but also hinders the economic development< At the second working conference on prevention and control of instrial pollution, Comrade Zhu Rongji stressed: "comprehensive utilization and turning waste into treasure not only protect national resources, but also make full use of national resources and purify the environment. It can be said that more can be achieved with one stone." In view of the present situation that the primary mineral resources are decreasing day by day in our country, it is an important problem to be solved urgently in the current mining development to reasonably develop and effectively utilize the tailings discharged from the ore dressing plants as the secondary mineral resources, so as to turn harm into benefit and waste into treasure. Mineral resources are a kind of non renewable resources. The full and reasonable use of tailings resources plays a very important role in improving the environment, ensuring the safety of people's property, recing the occupation of land, saving resources and improving the economic benefits of mines. It will be concive to the sustainable development of mining instry and obtain good social, environmental and economic benefits
the comprehensive utilization degree of tailings resources is a sign to measure a country's scientific and technological level, economic development and ecological environment protection. The developed countries take the waste free mine as the development goal. The comprehensive utilization of tailings resources in China's iron ore concentrators started late, and the recovery rate of tailings is very low, only about 7%. At present, according to the comprehensive utilization of tailings and the use of processed procts, it can be summarized as follows:
(1) tailings re concentration to recover a variety of valuable metals
(2) tailings are processed into a variety of building materials
(3) tailings are used as filling materials for goaf
(4) tailing is used to make agricultural fertilizer and improve soil
tailings re concentration measures
tailings are huge potential secondary mineral resources. China's iron ore resources are mostly lean ore, with iron grade of 30% - 35% accounting for about 80%, some of which are associated with polymetallic ore, hematite, etc. According to different types of lean iron ore, different separation processes should be adopted to recover one or more useful metals
through the investigation on the comprehensive utilization of tailings from more than 100 large and medium-sized iron ore concentrators in China's metallurgical system, it is known that the re concentration of tailings to recover a variety of valuable metals is an important way for the comprehensive utilization of tailings from iron ore concentrators, an effective measure for mine enterprises to increase proction and generate income, and a major measure for mine pollution control and environmental purification
in recent years, on the basis of experimental research on tailings re concentration, China's iron ore concentrators have adopted a variety of measures to re concentrate tailings, recover useful minerals, rece the final tailings grade, and obtain considerable economic benefits< According to the characteristics of tailings re concentration process and measures, it can be divided into three types:
(1) combination of increasing re concentration equipment and using idle equipment of main plant:
(2) combination of increasing re concentration equipment and using original process of main plant
(3) establishment of separate tailings re concentration plant
1.1 increase the reselection equipment and use the idle equipment of the main plant
most of China's large and medium-sized iron ore concentrators were built and put into operation from 1950s to 1970s. With the development of metallurgical instry, iron ore resources are graally reced and disappeared. At present, the mining proction capacity of some iron ores is reced, resulting in the situation that the proction capacity of concentrator is greater than that of mining proction capacity. Some equipment and facilities are idle, which directly affects the economic benefits of mining enterprises. In order to make rational use of the tailings resources and give full play to the existing potential, some concentrators adopt the measures of increasing the re concentration equipment and using the idle equipment to re concentrate the tailings discharged from the concentrator to obtain qualified concentrate, so as to achieve the purpose of recing tailings, increasing proction and income. There are Shougang waterworks concentrator, Dashihe concentrator, etc< The original design capacity of Dashihe concentrator and Shuichang Concentrator of Shougang Mining Company is 27 million tons of raw ore per year, which adopts three stages and one closed circuit crushing, stage grinding, stage separation, combined separation of low intensity magnetic separation and gravity separation, and fine screen self circulation process. The original design has 26 sets ￠ 2700mm × 3600 mm ball mill series. In recent years, e to the decline of mining proction capacity, the actual annual processing capacity of raw ore is only about 10 million tons, and about 60% of the rich capacity of the concentrator can be used
(1) the tailings of the concentrator of the waterworks are reprocessed. Construction of tailings re concentration equipment outside the main house. A 612m2 plant is built with 16 bkw1030 magnetic separators for tailings re concentration. The recovered coarse concentrate is pumped to the main plant for grinding and re concentration. In the main hall, two idle grinding and dressing series are used to treat the recovered coarse concentrate separately and process it into qualified concentrate. The flowsheet of tailings re concentration in Shuichang Concentrator is shown in Figure 1< (2) tailings re concentration in Dashihe concentrator. There are two processes in the tailings re concentration facility of the plant. The first process is to concentrate part of the tailings to be re concentrated by a series of magnetic separation equipment shut down in the main plant. The re concentration concentrate is grinded and re concentrated by the process of processing raw ore in the main plant to proce qualified concentrate. See Figure 2 for the first process of tailings re concentration in Dashihe concentrator
the second process of tailings re concentration in Dashihe concentrator belongs to the second type, which is the combination of adding RE concentration equipment and using the original process of the main plant
1.2 increase the re concentration equipment and use the original process of the main plant
some concentrators of this type include Dashihe concentrator series, Angang Gongchangling concentrator and WISCO Chengchao concentrator
(1) after the magnetic separation operation in each section of the main plant, some series of bkw103 tailings re separation magnetic separators are installed in Dashihe concentrator to re concentrate the tailings. The re concentrated concentrate enters this process for regrinding and re separation, and is processed into qualified concentrate. See Figure 3 for the second process of tailings re concentration in Dashihe concentrator< (2) tailings re concentration in Gongchangling concentrator of Angang. A sweeping workshop was built outside the main hall and six cp2012 disc permanent magnet machines were installed. The tailings proced in the main workshop are pumped into the primary magnetic separation after one-stage grinding of the original proction series after the coarse concentrate is selected by the magnetic separator, and then processed into the final concentrate together with the raw ore through the subsequent operations. The feature of the process is to make full use of the resial capacity of the original process equipment, only adding magnetic separator for tailings recovery and re separation, without adding grinding and classification equipment. The flowsheet of tailings re concentration in Gongchangling concentrator is shown in Figure 4
(3) tailings re concentration in Chengchao concentrator of WISCO. Using the tailings conveying chute of the existing concentrator, a JHC type rectangular ring permanent magnetic separator is installed before the tailings enter the concentration pool, so that all the tailings are re concentrated, and the coarse concentrate after re concentration is pumped back to the existing proction system for continuous separation, and then processed into qualified iron concentrate through the process of fine screening regrinding magnetic separation. The process flow is shown in Figure 5< In order to rece the final tailings grade, rece the cost of concentrate and improve the economic benefits of enterprises, many iron ore concentrators in China have set up separate tailings concentration plants with self raised funds. Benxi Steel Nanfen and Waitoushan tailings re concentration plant, Angang Dagushan, Donganshan and Qidashan tailings re concentration plant, and Maanshan mining company tailings re concentration plant have achieved good economic benefits
(1) tailings re concentration plant of Nanfen concentrator of Benxi steel. Nanfen concentrator discharges 5 million tons of tailings every year. The total tailings discharged from No.3, No.4 and No.5 concentrators of Nanfen mine are used to select the coarse concentrate by HS type magnetic recovery machine, and then the coarse concentrate is pumped to a separate reconcentration plant, and the final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering low intensity magnetic separation fine screening low intensity magnetic separation filtration. The process flow of Nanfen tailings re concentration is shown in Figure 6. The grade of tailings in the car room of Nanfen No.3, No.4 and No.5 concentrators is 8.6% before re concentration and 8.03% after re concentration. The proction equipment of Nanfen tailings re concentration plant is shown in Table 1
Table 1 main proction equipment details of Nanfen tailings re concentration plant
equipment name Model and specification / mm number Remarks
magnetic Reclaimer HS—￠1600 × eight two The 95.6ka/m coarse magnetic reclaimer is selected HS—￠1600 × ten two 96.2ka/m thick rubber pump ￠113 four Conveying back to fine
permanent magnetic separator ￠780 × one thousand and eight hundred one H-103.5 Ka / M
ball mill ￠2300 × three thousand one
double screw classifier ￠2000 × eight thousand and four hundred one
permanent magnet dewatering tank ￠2000 × one thousand five hundred and forty one Top magnetic system
permanent magnetic separator ￠780 × one thousand and eight hundred one H-71.7 Ka / M self made
fine screen four hundred × one thousand and two hundred × ten one A = 0.15mm one section
permanent magnet separator ￠780 × one thousand and eight hundred one H = 59.7 Ka / M
internal filter GN—12m2 one
water ring vacuum pump S2—3 one 5M3 / min
1 ﹥ and 2 ﹥ glue pumps ￠113 two Fine screen pump
3 × 4 × glue pump ￠113 two Tailings pump
5 #, 6 #, rubber pump ￠113 two The sand return pump
Nanfen tailings re concentration plant was put into operation in October 1993. In recent years, the concentrate output is stable and the economic benefit is considerable. The economic benefits of Nanfen tailings over the years are shown in Table 2
Table 2 economic benefits of tailings concentration plant over the years Proct Name Quantity / T Grade /% Total income / 10000 yuan Cost / 10000 yuan Profit / 10000 yuan
1993 Iron concentrate powder ten thousand and twenty-six sixty-five point two six two hundred and sixty one hundred and six 154
1994 Iron concentrate powder forty-two thousand six hundred and ten sixty-five point two seven one thousand one hundred and ninety-three five hundred and eleven 682
1995 Iron concentrate powder forty-eight thousand six hundred and eighty sixty-six point two seven one thousand three hundred and sixty-three six hundred and eight 755
1996 Iron concentrate powder fifty-three thousand eight hundred and forty sixty-six point one three one thousand five hundred and eighty-eight eight hundred and eight 780
1997 Iron concentrate powder forty-nine thousand six hundred and forty sixty-five point six three one thousand four hundred and twenty-four seven hundred and forty-five 679
total Iron concentrate powder one hundred and sixty-four thousand seven hundred and ninety-six sixty-five point seven one five thousand eight hundred and twenty-eight two thousand eight hundred and seventy-eight 2950
(2) Waitoushan concentrator of Benxi steel. Waitoushan concentrator discharges 2.28 million tons of tailings every year. The tailings are separated into coarse concentrate by JHC giant ring magnetic separator, and then the coarse concentrate is pumped to a separate re concentration plant. The final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering double drum low intensity magnetic separation. The process flow of Waitoushan tailings re concentration is shown in Figure 7< The grade of Waitoushan tailings is 7.62% before re concentration and 6.15% after re concentration. The main proction equipment of Waitoushan tailings concentration plant is shown in Figure 8
1 - JHC magnetic separator; 2、10¬— 10.2pnj sand pump; 3—￠750mm × 1800mm magnetic separator< br />4—￠1500mm × 3000mm ball mill; 5 - ￠ 1200mm single screw classifier; 6 - ￠ 1600mm dewatering tank
7,8 - double drum low intensity magnetic separator; 9-5m2 permanent magnetic filter; (3) tailing re concentration plant of Dagushan Concentrator of Angang. Dagushan Concentrator has invested 10 million yuan so far to establish three tailings re concentration recovery points. Magnetic separation regrinding re concentration process is adopted for tailings re concentration. There are two technological processes for tailings re concentration:
the first process is to cut off the flow on the tailings pipeline and connect the branch pipe from the main pipe. The tailings are separated into coarse concentrate by cylindrical magnetic separator, and then reground and magnetic separation
the comprehensive utilization degree of tailings resources is a sign to measure a country's scientific and technological level, economic development and ecological environment protection. The developed countries take the waste free mine as the development goal. The comprehensive utilization of tailings resources in China's iron ore concentrators started late, and the recovery rate of tailings is very low, only about 7%. At present, according to the comprehensive utilization of tailings and the use of processed procts, it can be summarized as follows:
(1) tailings re concentration to recover a variety of valuable metals
(2) tailings are processed into a variety of building materials
(3) tailings are used as filling materials for goaf
(4) tailing is used to make agricultural fertilizer and improve soil
tailings re concentration measures
tailings are huge potential secondary mineral resources. China's iron ore resources are mostly lean ore, with iron grade of 30% - 35% accounting for about 80%, some of which are associated with polymetallic ore, hematite, etc. According to different types of lean iron ore, different separation processes should be adopted to recover one or more useful metals
through the investigation on the comprehensive utilization of tailings from more than 100 large and medium-sized iron ore concentrators in China's metallurgical system, it is known that the re concentration of tailings to recover a variety of valuable metals is an important way for the comprehensive utilization of tailings from iron ore concentrators, an effective measure for mine enterprises to increase proction and generate income, and a major measure for mine pollution control and environmental purification
in recent years, on the basis of experimental research on tailings re concentration, China's iron ore concentrators have adopted a variety of measures to re concentrate tailings, recover useful minerals, rece the final tailings grade, and obtain considerable economic benefits< According to the characteristics of tailings re concentration process and measures, it can be divided into three types:
(1) combination of increasing re concentration equipment and using idle equipment of main plant:
(2) combination of increasing re concentration equipment and using original process of main plant
(3) establishment of separate tailings re concentration plant
1.1 increase the reselection equipment and use the idle equipment of the main plant
most of China's large and medium-sized iron ore concentrators were built and put into operation from 1950s to 1970s. With the development of metallurgical instry, iron ore resources are graally reced and disappeared. At present, the mining proction capacity of some iron ores is reced, resulting in the situation that the proction capacity of concentrator is greater than that of mining proction capacity. Some equipment and facilities are idle, which directly affects the economic benefits of mining enterprises. In order to make rational use of the tailings resources and give full play to the existing potential, some concentrators adopt the measures of increasing the re concentration equipment and using the idle equipment to re concentrate the tailings discharged from the concentrator to obtain qualified concentrate, so as to achieve the purpose of recing tailings, increasing proction and income. There are Shougang waterworks concentrator, Dashihe concentrator, etc< The original design capacity of Dashihe concentrator and Shuichang Concentrator of Shougang Mining Company is 27 million tons of raw ore per year, which adopts three stages and one closed circuit crushing, stage grinding, stage separation, combined separation of low intensity magnetic separation and gravity separation, and fine screen self circulation process. The original design has 26 sets ￠ 2700mm × 3600 mm ball mill series. In recent years, e to the decline of mining proction capacity, the actual annual processing capacity of raw ore is only about 10 million tons, and about 60% of the rich capacity of the concentrator can be used
(1) the tailings of the concentrator of the waterworks are reprocessed. Construction of tailings re concentration equipment outside the main house. A 612m2 plant is built with 16 bkw1030 magnetic separators for tailings re concentration. The recovered coarse concentrate is pumped to the main plant for grinding and re concentration. In the main hall, two idle grinding and dressing series are used to treat the recovered coarse concentrate separately and process it into qualified concentrate. The flowsheet of tailings re concentration in Shuichang Concentrator is shown in Figure 1< (2) tailings re concentration in Dashihe concentrator. There are two processes in the tailings re concentration facility of the plant. The first process is to concentrate part of the tailings to be re concentrated by a series of magnetic separation equipment shut down in the main plant. The re concentration concentrate is grinded and re concentrated by the process of processing raw ore in the main plant to proce qualified concentrate. See Figure 2 for the first process of tailings re concentration in Dashihe concentrator
the second process of tailings re concentration in Dashihe concentrator belongs to the second type, which is the combination of adding RE concentration equipment and using the original process of the main plant
1.2 increase the re concentration equipment and use the original process of the main plant
some concentrators of this type include Dashihe concentrator series, Angang Gongchangling concentrator and WISCO Chengchao concentrator
(1) after the magnetic separation operation in each section of the main plant, some series of bkw103 tailings re separation magnetic separators are installed in Dashihe concentrator to re concentrate the tailings. The re concentrated concentrate enters this process for regrinding and re separation, and is processed into qualified concentrate. See Figure 3 for the second process of tailings re concentration in Dashihe concentrator< (2) tailings re concentration in Gongchangling concentrator of Angang. A sweeping workshop was built outside the main hall and six cp2012 disc permanent magnet machines were installed. The tailings proced in the main workshop are pumped into the primary magnetic separation after one-stage grinding of the original proction series after the coarse concentrate is selected by the magnetic separator, and then processed into the final concentrate together with the raw ore through the subsequent operations. The feature of the process is to make full use of the resial capacity of the original process equipment, only adding magnetic separator for tailings recovery and re separation, without adding grinding and classification equipment. The flowsheet of tailings re concentration in Gongchangling concentrator is shown in Figure 4
(3) tailings re concentration in Chengchao concentrator of WISCO. Using the tailings conveying chute of the existing concentrator, a JHC type rectangular ring permanent magnetic separator is installed before the tailings enter the concentration pool, so that all the tailings are re concentrated, and the coarse concentrate after re concentration is pumped back to the existing proction system for continuous separation, and then processed into qualified iron concentrate through the process of fine screening regrinding magnetic separation. The process flow is shown in Figure 5< In order to rece the final tailings grade, rece the cost of concentrate and improve the economic benefits of enterprises, many iron ore concentrators in China have set up separate tailings concentration plants with self raised funds. Benxi Steel Nanfen and Waitoushan tailings re concentration plant, Angang Dagushan, Donganshan and Qidashan tailings re concentration plant, and Maanshan mining company tailings re concentration plant have achieved good economic benefits
(1) tailings re concentration plant of Nanfen concentrator of Benxi steel. Nanfen concentrator discharges 5 million tons of tailings every year. The total tailings discharged from No.3, No.4 and No.5 concentrators of Nanfen mine are used to select the coarse concentrate by HS type magnetic recovery machine, and then the coarse concentrate is pumped to a separate reconcentration plant, and the final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering low intensity magnetic separation fine screening low intensity magnetic separation filtration. The process flow of Nanfen tailings re concentration is shown in Figure 6. The grade of tailings in the car room of Nanfen No.3, No.4 and No.5 concentrators is 8.6% before re concentration and 8.03% after re concentration. The proction equipment of Nanfen tailings re concentration plant is shown in Table 1
Table 1 main proction equipment details of Nanfen tailings re concentration plant
equipment name Model and specification / mm number Remarks
magnetic Reclaimer HS—￠1600 × eight two The 95.6ka/m coarse magnetic reclaimer is selected HS—￠1600 × ten two 96.2ka/m thick rubber pump ￠113 four Conveying back to fine
permanent magnetic separator ￠780 × one thousand and eight hundred one H-103.5 Ka / M
ball mill ￠2300 × three thousand one
double screw classifier ￠2000 × eight thousand and four hundred one
permanent magnet dewatering tank ￠2000 × one thousand five hundred and forty one Top magnetic system
permanent magnetic separator ￠780 × one thousand and eight hundred one H-71.7 Ka / M self made
fine screen four hundred × one thousand and two hundred × ten one A = 0.15mm one section
permanent magnet separator ￠780 × one thousand and eight hundred one H = 59.7 Ka / M
internal filter GN—12m2 one
water ring vacuum pump S2—3 one 5M3 / min
1 ﹥ and 2 ﹥ glue pumps ￠113 two Fine screen pump
3 × 4 × glue pump ￠113 two Tailings pump
5 #, 6 #, rubber pump ￠113 two The sand return pump
Nanfen tailings re concentration plant was put into operation in October 1993. In recent years, the concentrate output is stable and the economic benefit is considerable. The economic benefits of Nanfen tailings over the years are shown in Table 2
Table 2 economic benefits of tailings concentration plant over the years Proct Name Quantity / T Grade /% Total income / 10000 yuan Cost / 10000 yuan Profit / 10000 yuan
1993 Iron concentrate powder ten thousand and twenty-six sixty-five point two six two hundred and sixty one hundred and six 154
1994 Iron concentrate powder forty-two thousand six hundred and ten sixty-five point two seven one thousand one hundred and ninety-three five hundred and eleven 682
1995 Iron concentrate powder forty-eight thousand six hundred and eighty sixty-six point two seven one thousand three hundred and sixty-three six hundred and eight 755
1996 Iron concentrate powder fifty-three thousand eight hundred and forty sixty-six point one three one thousand five hundred and eighty-eight eight hundred and eight 780
1997 Iron concentrate powder forty-nine thousand six hundred and forty sixty-five point six three one thousand four hundred and twenty-four seven hundred and forty-five 679
total Iron concentrate powder one hundred and sixty-four thousand seven hundred and ninety-six sixty-five point seven one five thousand eight hundred and twenty-eight two thousand eight hundred and seventy-eight 2950
(2) Waitoushan concentrator of Benxi steel. Waitoushan concentrator discharges 2.28 million tons of tailings every year. The tailings are separated into coarse concentrate by JHC giant ring magnetic separator, and then the coarse concentrate is pumped to a separate re concentration plant. The final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering double drum low intensity magnetic separation. The process flow of Waitoushan tailings re concentration is shown in Figure 7< The grade of Waitoushan tailings is 7.62% before re concentration and 6.15% after re concentration. The main proction equipment of Waitoushan tailings concentration plant is shown in Figure 8
1 - JHC magnetic separator; 2、10¬— 10.2pnj sand pump; 3—￠750mm × 1800mm magnetic separator< br />4—￠1500mm × 3000mm ball mill; 5 - ￠ 1200mm single screw classifier; 6 - ￠ 1600mm dewatering tank
7,8 - double drum low intensity magnetic separator; 9-5m2 permanent magnetic filter; (3) tailing re concentration plant of Dagushan Concentrator of Angang. Dagushan Concentrator has invested 10 million yuan so far to establish three tailings re concentration recovery points. Magnetic separation regrinding re concentration process is adopted for tailings re concentration. There are two technological processes for tailings re concentration:
the first process is to cut off the flow on the tailings pipeline and connect the branch pipe from the main pipe. The tailings are separated into coarse concentrate by cylindrical magnetic separator, and then reground and magnetic separation
5. China is rich in iron ore resources, with proven iron ore reserves of 53.1 billion tons. With the development of China's national economy, the amount of iron ore provided for the iron and steel instry is about 200-250 million tons per year. Due to the poor, fine and miscellaneous characteristics of iron ore in China, a large number of tailings are proced in the process of mining and ore processing. According to statistics, the annual amount of tailings discharged from iron ore dressing plant is about 130-170 million tons. At present, tailings have become a serious pollution source of the mine. A large amount of tailings not only pollutes the surrounding environment, but also causes landslides and dam break accidents, endangering the safety of people's lives and property. It also occupies a lot of land, consumes a lot of funds, wastes resources, and affects the economic benefits of enterprises. It not only damages the ecological balance, but also hinders the economic development< At the second working conference on prevention and control of instrial pollution, Comrade Zhu Rongji stressed: "comprehensive utilization and turning waste into treasure not only protect national resources, but also make full use of national resources and purify the environment. It can be said that more can be achieved with one stone." In view of the present situation that the primary mineral resources are decreasing day by day in our country, it is an important problem to be solved urgently in the current mining development to reasonably develop and effectively utilize the tailings discharged from the ore dressing plants as the secondary mineral resources, so as to turn harm into benefit and waste into treasure. Mineral resources are a kind of non renewable resources. The full and reasonable use of tailings resources plays a very important role in improving the environment, ensuring the safety of people's property, recing the occupation of land, saving resources and improving the economic benefits of mines. It will be concive to the sustainable development of mining instry and obtain good social, environmental and economic benefits
the comprehensive utilization degree of tailings resources is a sign to measure a country's scientific and technological level, economic development and ecological environment protection. The developed countries take the waste free mine as the development goal. The comprehensive utilization of tailings resources in China's iron ore concentrators started late, and the recovery rate of tailings is very low, only about 7%. At present, according to the comprehensive utilization of tailings and the use of processed procts, it can be summarized as follows:
(1) tailings re concentration to recover a variety of valuable metals
(2) tailings are processed into a variety of building materials
(3) tailings are used as filling materials for goaf
(4) tailing is used to make agricultural fertilizer and improve soil
tailings re concentration measures
tailings are huge potential secondary mineral resources. China's iron ore resources are mostly lean ore, with iron grade of 30% - 35% accounting for about 80%, some of which are associated with polymetallic ore, hematite, etc. According to different types of lean iron ore, different separation processes should be adopted to recover one or more useful metals
through the investigation on the comprehensive utilization of tailings from more than 100 large and medium-sized iron ore concentrators in China's metallurgical system, it is known that the re concentration of tailings to recover a variety of valuable metals is an important way for the comprehensive utilization of tailings from iron ore concentrators, an effective measure for mine enterprises to increase proction and generate income, and a major measure for mine pollution control and environmental purification
in recent years, on the basis of experimental research on tailings re concentration, China's iron ore concentrators have adopted a variety of measures to re concentrate tailings, recover useful minerals, rece the final tailings grade, and obtain considerable economic benefits< According to the characteristics of tailings re concentration process and measures, it can be divided into three types:
(1) combination of increasing re concentration equipment and using idle equipment of main plant:
(2) combination of increasing re concentration equipment and using original process of main plant
(3) establishment of separate tailings re concentration plant
1.1 increase the reselection equipment and use the idle equipment in the main plant
most of China's large and medium-sized iron ore concentrators were built and put into operation from 1950s to 1970s. With the development of metallurgical instry, iron ore resources are graally reced and disappeared. At present, the mining proction capacity of some iron ores is reced, resulting in the situation that the proction capacity of concentrator is greater than that of mining proction capacity. Some equipment and facilities are idle, which directly affects the economic benefits of mining enterprises. In order to make rational use of the tailings resources and give full play to the existing potential, some concentrators adopt the measures of increasing the re concentration equipment and using the idle equipment to re concentrate the tailings discharged from the concentrator to obtain qualified concentrate, so as to achieve the purpose of recing tailings, increasing proction and income. There are Shougang waterworks concentrator, Dashihe concentrator, etc< The original design capacity of Dashihe concentrator and Shuichang Concentrator of Shougang Mining Company is 27 million tons of raw ore per year, which adopts three stages and one closed circuit crushing, stage grinding, stage separation, combined separation of low intensity magnetic separation and gravity separation, and fine screen self circulation process. The original design has 26 sets ￠ 2700mm × 3600 mm ball mill series. In recent years, e to the decline of mining proction capacity, the actual annual processing capacity of raw ore is only about 10 million tons, and about 60% of the rich capacity of the concentrator can be used
(1) the tailings of the concentrator of the waterworks are reprocessed. Construction of tailings re concentration equipment outside the main house. A 612m2 plant is built with 16 bkw1030 magnetic separators for tailings re concentration. The recovered coarse concentrate is pumped to the main plant for grinding and re concentration. In the main hall, two idle grinding and dressing series are used to treat the recovered coarse concentrate separately and process it into qualified concentrate. The flowsheet of tailings re concentration in Shuichang Concentrator is shown in Figure 1< (2) tailings re concentration in Dashihe concentrator. There are two processes in the tailings re concentration facility of the plant. The first process is to concentrate part of the tailings to be re concentrated by a series of magnetic separation equipment shut down in the main plant. The re concentration concentrate is grinded and re concentrated by the process of processing raw ore in the main plant to proce qualified concentrate. See Figure 2 for the first process of tailings re concentration in Dashihe concentrator
the second process of tailings re concentration in Dashihe concentrator belongs to the second type, which is the combination of adding RE concentration equipment and using the original process of the main plant
1.2 increase the re concentration equipment and use the original process of the main plant
this type of concentrator includes some series of Dashihe concentrator, Gongchangling concentrator of Angang and Chengchao concentrator of WISCO
(1) after the magnetic separation operation in each section of the main plant, some series of bkw103 tailings re separation magnetic separators are installed in Dashihe concentrator to re concentrate the tailings. The re concentrated concentrate enters this process for regrinding and re separation, and is processed into qualified concentrate. See Figure 3 for the second process of tailings re concentration in Dashihe concentrator< (2) tailings re concentration in Gongchangling concentrator of Angang. A sweeping workshop was built outside the main hall and six cp2012 disc permanent magnet machines were installed. The tailings proced in the main workshop are pumped into the primary magnetic separation after one-stage grinding of the original proction series after the coarse concentrate is selected by the magnetic separator, and then processed into the final concentrate together with the raw ore through the subsequent operations. The feature of the process is to make full use of the resial capacity of the original process equipment, only adding magnetic separator for tailings recovery and re separation, without adding grinding and classification equipment. The flowsheet of tailings re concentration in Gongchangling concentrator is shown in Figure 4
(3) tailings re concentration in Chengchao concentrator of WISCO. Using the tailings conveying chute of the existing concentrator, a JHC type rectangular ring permanent magnetic separator is installed before the tailings enter the concentration pool, so that all the tailings are re concentrated, and the coarse concentrate after re concentration is pumped back to the existing proction system for continuous separation, and then processed into qualified iron concentrate through the process of fine screening regrinding magnetic separation. The process flow is shown in Figure 5< In order to rece the final tailings grade, rece the cost of concentrate and improve the economic benefits of enterprises, many iron ore concentrators in China have set up separate tailings concentration plants with self raised funds. Benxi Steel Nanfen and Waitoushan tailings re concentration plant, Angang Dagushan, Donganshan and Qidashan tailings re concentration plant, and Maanshan mining company tailings re concentration plant have achieved good economic benefits
(1) tailings re concentration plant of Nanfen concentrator of Benxi steel. Nanfen concentrator discharges 5 million tons of tailings every year. The total tailings discharged from No.3, No.4 and No.5 concentrators of Nanfen mine are used to select the coarse concentrate by HS type magnetic recovery machine, and then the coarse concentrate is pumped to a separate reconcentration plant, and the final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering low intensity magnetic separation fine screening low intensity magnetic separation filtration. The process flow of Nanfen tailings re concentration is shown in Figure 6. The grade of tailings in the car room of Nanfen No.3, No.4 and No.5 concentrators is 8.6% before re concentration and 8.03% after re concentration. The proction equipment of Nanfen tailings re concentration plant is shown in Table 1
Table 1 main proction equipment details of Nanfen tailings re concentration plant
equipment name, model, specification / mm quantity remarks
magnetic recovery machine HS - ￠ 1600 × 8.295.6ka/m rough selection
magnetic recovery machine HS - ￠ 1600 × 10 2 96.2ka/m coarse selection
rubber pump ￠ 113 4 conveying back to fine
permanent magnetic separator ￠ 780 × 1800 1 h-103.5 Ka / M
ball mill ￠ 2300 × 3000 1
double screw classifier ￠ 2000 × 8400 1
permanent magnet dewatering tank ￠ 2000 × 1540 1 top magnetic system
permanent magnetic separator ￠ 780 × 1800 1 h-71.7 Ka / M self made
fine screen 400 × one thousand and two hundred × 101 A = 0.15mm one section
permanent magnetic separator ￠ 780 × 1800 1 h = 59.7 Ka / M
internal filter gn-12m2 1
water ring vacuum pump s2-31 11.5m3/min
1 ￠ 2 ￠ rubber pump ￠ 113 2 fine screen pump
3 ￠ 4 ￠ rubber pump ￠ 113 2 tailings pump
5 ￠ 6 ￠ rubber pump ￠ 113 2 sand return pump
Nanfen tailings re concentration plant was put into operation in October 1993. In recent years, the concentrate output is stable and the economic benefit is considerable. The economic benefits of Nanfen tailings over the years are shown in Table 2
Table 2 economic benefits of tailings re concentration plant over the years
year name quantity / T grade /% total income / 10000 yuan cost / 10000 yuan profit / 10000 yuan
1993 iron concentrate powder 10026 65.26 260 106 154
1994 iron concentrate powder 42610 65.27 1193 511 682
1995 iron concentrate powder 48680 66.27 1363 608 755
1996 iron concentrate powder 53840 66.13 1588 808 780
1997 iron concentrate powder 49640 65.63 1424 745 679
total iron concentrate powder 164796 65.71 5828 2878 2950
(2) Waitoushan concentrator of Benxi steel. Waitoushan concentrator discharges 2.28 million tons of tailings every year. The tailings are separated into coarse concentrate by JHC giant ring magnetic separator, and then the coarse concentrate is pumped to a separate re concentration plant. The final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering double drum low intensity magnetic separation. The process flow of Waitoushan tailings re concentration is shown in Figure 7< The grade of Waitoushan tailings is 7.62% before re concentration and 6.15% after re concentration. The main proction equipment of Waitoushan tailings concentration plant is shown in Figure 8
1 - JHC magnetic separator; 2、10?— 10.2pnj sand pump; 3—￠750mm × 1800mm magnetic separator< br />4—￠1500mm × 3000mm ball mill; 5 - ￠ 1200mm single screw classifier; 6 - ￠ 1600mm dewatering tank
7,8 - double drum low intensity magnetic separator; 9-5m2 permanent magnetic filter; (3) tailing re concentration plant of Dagushan Concentrator of Angang. Dagushan Concentrator has invested 10 million yuan so far to establish three tailings re concentration recovery points. Magnetic separation regrinding re concentration process is adopted for tailings re concentration. There are two technological processes for tailings re concentration:
the first process is to cut off the flow on the tailings pipeline and connect the branch pipe from the main pipe. The tailings are separated into coarse concentrate by cylinder magnetic separator, and then reground and separated by magnetic separator and spiral chute to obtain the final concentrate, as shown in Figure 9.
the second process is to install disc magnetic separator (two sections) in the tailings chute to select coarse concentrate
the comprehensive utilization degree of tailings resources is a sign to measure a country's scientific and technological level, economic development and ecological environment protection. The developed countries take the waste free mine as the development goal. The comprehensive utilization of tailings resources in China's iron ore concentrators started late, and the recovery rate of tailings is very low, only about 7%. At present, according to the comprehensive utilization of tailings and the use of processed procts, it can be summarized as follows:
(1) tailings re concentration to recover a variety of valuable metals
(2) tailings are processed into a variety of building materials
(3) tailings are used as filling materials for goaf
(4) tailing is used to make agricultural fertilizer and improve soil
tailings re concentration measures
tailings are huge potential secondary mineral resources. China's iron ore resources are mostly lean ore, with iron grade of 30% - 35% accounting for about 80%, some of which are associated with polymetallic ore, hematite, etc. According to different types of lean iron ore, different separation processes should be adopted to recover one or more useful metals
through the investigation on the comprehensive utilization of tailings from more than 100 large and medium-sized iron ore concentrators in China's metallurgical system, it is known that the re concentration of tailings to recover a variety of valuable metals is an important way for the comprehensive utilization of tailings from iron ore concentrators, an effective measure for mine enterprises to increase proction and generate income, and a major measure for mine pollution control and environmental purification
in recent years, on the basis of experimental research on tailings re concentration, China's iron ore concentrators have adopted a variety of measures to re concentrate tailings, recover useful minerals, rece the final tailings grade, and obtain considerable economic benefits< According to the characteristics of tailings re concentration process and measures, it can be divided into three types:
(1) combination of increasing re concentration equipment and using idle equipment of main plant:
(2) combination of increasing re concentration equipment and using original process of main plant
(3) establishment of separate tailings re concentration plant
1.1 increase the reselection equipment and use the idle equipment in the main plant
most of China's large and medium-sized iron ore concentrators were built and put into operation from 1950s to 1970s. With the development of metallurgical instry, iron ore resources are graally reced and disappeared. At present, the mining proction capacity of some iron ores is reced, resulting in the situation that the proction capacity of concentrator is greater than that of mining proction capacity. Some equipment and facilities are idle, which directly affects the economic benefits of mining enterprises. In order to make rational use of the tailings resources and give full play to the existing potential, some concentrators adopt the measures of increasing the re concentration equipment and using the idle equipment to re concentrate the tailings discharged from the concentrator to obtain qualified concentrate, so as to achieve the purpose of recing tailings, increasing proction and income. There are Shougang waterworks concentrator, Dashihe concentrator, etc< The original design capacity of Dashihe concentrator and Shuichang Concentrator of Shougang Mining Company is 27 million tons of raw ore per year, which adopts three stages and one closed circuit crushing, stage grinding, stage separation, combined separation of low intensity magnetic separation and gravity separation, and fine screen self circulation process. The original design has 26 sets ￠ 2700mm × 3600 mm ball mill series. In recent years, e to the decline of mining proction capacity, the actual annual processing capacity of raw ore is only about 10 million tons, and about 60% of the rich capacity of the concentrator can be used
(1) the tailings of the concentrator of the waterworks are reprocessed. Construction of tailings re concentration equipment outside the main house. A 612m2 plant is built with 16 bkw1030 magnetic separators for tailings re concentration. The recovered coarse concentrate is pumped to the main plant for grinding and re concentration. In the main hall, two idle grinding and dressing series are used to treat the recovered coarse concentrate separately and process it into qualified concentrate. The flowsheet of tailings re concentration in Shuichang Concentrator is shown in Figure 1< (2) tailings re concentration in Dashihe concentrator. There are two processes in the tailings re concentration facility of the plant. The first process is to concentrate part of the tailings to be re concentrated by a series of magnetic separation equipment shut down in the main plant. The re concentration concentrate is grinded and re concentrated by the process of processing raw ore in the main plant to proce qualified concentrate. See Figure 2 for the first process of tailings re concentration in Dashihe concentrator
the second process of tailings re concentration in Dashihe concentrator belongs to the second type, which is the combination of adding RE concentration equipment and using the original process of the main plant
1.2 increase the re concentration equipment and use the original process of the main plant
this type of concentrator includes some series of Dashihe concentrator, Gongchangling concentrator of Angang and Chengchao concentrator of WISCO
(1) after the magnetic separation operation in each section of the main plant, some series of bkw103 tailings re separation magnetic separators are installed in Dashihe concentrator to re concentrate the tailings. The re concentrated concentrate enters this process for regrinding and re separation, and is processed into qualified concentrate. See Figure 3 for the second process of tailings re concentration in Dashihe concentrator< (2) tailings re concentration in Gongchangling concentrator of Angang. A sweeping workshop was built outside the main hall and six cp2012 disc permanent magnet machines were installed. The tailings proced in the main workshop are pumped into the primary magnetic separation after one-stage grinding of the original proction series after the coarse concentrate is selected by the magnetic separator, and then processed into the final concentrate together with the raw ore through the subsequent operations. The feature of the process is to make full use of the resial capacity of the original process equipment, only adding magnetic separator for tailings recovery and re separation, without adding grinding and classification equipment. The flowsheet of tailings re concentration in Gongchangling concentrator is shown in Figure 4
(3) tailings re concentration in Chengchao concentrator of WISCO. Using the tailings conveying chute of the existing concentrator, a JHC type rectangular ring permanent magnetic separator is installed before the tailings enter the concentration pool, so that all the tailings are re concentrated, and the coarse concentrate after re concentration is pumped back to the existing proction system for continuous separation, and then processed into qualified iron concentrate through the process of fine screening regrinding magnetic separation. The process flow is shown in Figure 5< In order to rece the final tailings grade, rece the cost of concentrate and improve the economic benefits of enterprises, many iron ore concentrators in China have set up separate tailings concentration plants with self raised funds. Benxi Steel Nanfen and Waitoushan tailings re concentration plant, Angang Dagushan, Donganshan and Qidashan tailings re concentration plant, and Maanshan mining company tailings re concentration plant have achieved good economic benefits
(1) tailings re concentration plant of Nanfen concentrator of Benxi steel. Nanfen concentrator discharges 5 million tons of tailings every year. The total tailings discharged from No.3, No.4 and No.5 concentrators of Nanfen mine are used to select the coarse concentrate by HS type magnetic recovery machine, and then the coarse concentrate is pumped to a separate reconcentration plant, and the final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering low intensity magnetic separation fine screening low intensity magnetic separation filtration. The process flow of Nanfen tailings re concentration is shown in Figure 6. The grade of tailings in the car room of Nanfen No.3, No.4 and No.5 concentrators is 8.6% before re concentration and 8.03% after re concentration. The proction equipment of Nanfen tailings re concentration plant is shown in Table 1
Table 1 main proction equipment details of Nanfen tailings re concentration plant
equipment name, model, specification / mm quantity remarks
magnetic recovery machine HS - ￠ 1600 × 8.295.6ka/m rough selection
magnetic recovery machine HS - ￠ 1600 × 10 2 96.2ka/m coarse selection
rubber pump ￠ 113 4 conveying back to fine
permanent magnetic separator ￠ 780 × 1800 1 h-103.5 Ka / M
ball mill ￠ 2300 × 3000 1
double screw classifier ￠ 2000 × 8400 1
permanent magnet dewatering tank ￠ 2000 × 1540 1 top magnetic system
permanent magnetic separator ￠ 780 × 1800 1 h-71.7 Ka / M self made
fine screen 400 × one thousand and two hundred × 101 A = 0.15mm one section
permanent magnetic separator ￠ 780 × 1800 1 h = 59.7 Ka / M
internal filter gn-12m2 1
water ring vacuum pump s2-31 11.5m3/min
1 ￠ 2 ￠ rubber pump ￠ 113 2 fine screen pump
3 ￠ 4 ￠ rubber pump ￠ 113 2 tailings pump
5 ￠ 6 ￠ rubber pump ￠ 113 2 sand return pump
Nanfen tailings re concentration plant was put into operation in October 1993. In recent years, the concentrate output is stable and the economic benefit is considerable. The economic benefits of Nanfen tailings over the years are shown in Table 2
Table 2 economic benefits of tailings re concentration plant over the years
year name quantity / T grade /% total income / 10000 yuan cost / 10000 yuan profit / 10000 yuan
1993 iron concentrate powder 10026 65.26 260 106 154
1994 iron concentrate powder 42610 65.27 1193 511 682
1995 iron concentrate powder 48680 66.27 1363 608 755
1996 iron concentrate powder 53840 66.13 1588 808 780
1997 iron concentrate powder 49640 65.63 1424 745 679
total iron concentrate powder 164796 65.71 5828 2878 2950
(2) Waitoushan concentrator of Benxi steel. Waitoushan concentrator discharges 2.28 million tons of tailings every year. The tailings are separated into coarse concentrate by JHC giant ring magnetic separator, and then the coarse concentrate is pumped to a separate re concentration plant. The final concentrate is obtained through the process of low intensity magnetic separation grinding classification magnetic dewatering double drum low intensity magnetic separation. The process flow of Waitoushan tailings re concentration is shown in Figure 7< The grade of Waitoushan tailings is 7.62% before re concentration and 6.15% after re concentration. The main proction equipment of Waitoushan tailings concentration plant is shown in Figure 8
1 - JHC magnetic separator; 2、10?— 10.2pnj sand pump; 3—￠750mm × 1800mm magnetic separator< br />4—￠1500mm × 3000mm ball mill; 5 - ￠ 1200mm single screw classifier; 6 - ￠ 1600mm dewatering tank
7,8 - double drum low intensity magnetic separator; 9-5m2 permanent magnetic filter; (3) tailing re concentration plant of Dagushan Concentrator of Angang. Dagushan Concentrator has invested 10 million yuan so far to establish three tailings re concentration recovery points. Magnetic separation regrinding re concentration process is adopted for tailings re concentration. There are two technological processes for tailings re concentration:
the first process is to cut off the flow on the tailings pipeline and connect the branch pipe from the main pipe. The tailings are separated into coarse concentrate by cylinder magnetic separator, and then reground and separated by magnetic separator and spiral chute to obtain the final concentrate, as shown in Figure 9.
the second process is to install disc magnetic separator (two sections) in the tailings chute to select coarse concentrate
6.
1. As shown in the figure, change the text format of the values in this column to the number format
7. Can not drop, can only use mobile phone number registration Oh!
8.
bus route: watershed line of Chang 55 road → Jiao 100 Road, the whole journey is about 21.1km
1. Walk about 330m from Huzhuang village to Huzhuang station
2. Take watershed line of Chang 55 Road, pass 9 stops, and reach Changping Central Park Station (or take Shangkou line of Chang 55 Road)
3. Take Jiao 100 Road, pass 10 stops, and reach Baishan station
4. Walk about 1.1km, Arrive at Baishan Village
9. Take No.11 bus to Gaogang station, and then take No.53 bus to Huzhuang. I don't know where Dingzhuang is. You can ask the driver of No.53 bus to Huzhuang, or call a taxi after you get to Huzhuang
10. Notre Dame and Huzhuang church are both in Huzhuang, which is close to the county. Rose garden is in Beixin village of rose town. It's not far away. It's only half an hour's drive from the county.
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