Gold washer

1. There are many kinds of gold separation equipment used to extract gold from river sand. The specific equipment should be determined according to the type and nature of sand gold. In general, the extraction of gold from sand gold ore requires screening equipment, gravity separation equipment and cleaning equipment. As a professional gold separation equipment manufacturer, Gongyi Furui machinery factory makes a brief introction here for your reference!

2. The extraction of gold comes from placer gold and pulse gold. Since the 1970s, the output of vein gold has been maintained at 75% ～ 85%, and placer gold accounts for 15% ～ 25%< After the primary gold deposit is exposed to the surface, e to mechanical and chemical weathering, the gold bearing vein or gold bearing mother rock is graally broken into cuttings and gold grains. Then, under the action of transportation and separation by external force, the minerals with larger specific gravity (such as gold grains) are deposited on the hillside, river bed and lakeshore bank to form a certain enrichment. Those with instrial mining value are called placer gold deposits
placer gold deposits are usually mined by dredger, hydraulic mining, excavator and underground (shaft) mining. The placer gold deposits in China are mainly mined by dredger, hydraulic mining and excavator mining
placer gold beneficiation process mainly includes preparation operation and beneficiation operation before beneficiation. Preparation operation is mainly composed of crushing and screening. Fragmentation is mainly to dissociate the ore particles and clay slime in the mined ore. Screening is to screen out the coarse fraction without gold. The commonly used equipments are plane screen, cylinder screen, cylinder scrubbing machine, etc. Gravity beneficiation is mainly used for the separation of placer gold. On the one hand, the placer gold ratio is large (average 17.50-18.0) and the particle size is coarse (generally 0.074-2mm). On the other hand, gravity beneficiation is more economical and simple. Gravity separation equipment generally uses various types of chutes, jigs and shakers (commonly used for cleaning)< However, gravity separation, flotation, mercury mixing, cyanidation, resin pulp method, carbon pulp adsorption method and heap leaching method are commonly used to extract gold. For some kinds of ores, the combined gold extraction process is often used
there are many schemes of gold separation process used in proction practice, which are usually as follows:
1. Single mixed mercury process is suitable for the treatment of quartz vein primary deposit and oxidized ore containing coarse-grained gold. The method of extracting gold by mixing mercury is an old and common method of gold separation. In the modern gold instry, the mixed mercury method still occupies a very important position. Because gold is mostly in free state in ores, a part of gold particles in all kinds of ores can be recovered by mixed mercury method. Practice has proved that the loss of coarse gold in tailings can be obviously reced by recovering part of gold particles in advance with mercury mixing method in gold separation process
the theoretical basis of gold extraction by mixed mercury method is that mercury can selectively wet gold particles and then diffuse into the wetted gold particles
in the slurry with water as the medium, when Mercury contacts the surface of gold particles, the contact surface formed by gold and mercury replaces the original contact surface between gold and water and between mercury and water, thus recing the surface energy and destroying the hydration film which hinders the contact between gold and mercury. At this time, mercury diffuses rapidly along the surface of the gold particle and reces the surface energy at the phase interface. Then mercury diffuses into gold particles and forms mercury compound amalgam (mercury paste)
the mixed mercury extraction method can be divided into internal mixed mercury and external mixed mercury. The mercury mixing equipment includes mixing plate, mixing chute, rammer, mixing cylinder and special small ball mill or rod mill< The process is simple, easy to operate and low cost. However, mercury is a toxic substance, which is harmful to human body. Therefore, the concentrator using mixed mercury to extract gold should strictly abide by the safety technical operation proceres, so as to minimize the harm of mercury vapor and metal mercury to human body
2. The combined process of mercury mixing and gravity separation is divided into two schemes: mixing mercury before gravity separation and gravity separation before Mercury mixing. The process of mixing mercury before gravity separation is suitable for treating simple quartz vein gold bearing ore. The process of gravity separation followed by mercury mixing is suitable for the treatment of large gold particles, but the surface is not easy to be directly mixed with mercury, and placer gold ores with low gold content
3. Gravity separation (mixed mercury) - cyanidation combined process, which is suitable for the treatment of quartz vein gold bearing oxide ore. The concentrate from gravity separation is mixed with mercury; Or the raw ore is directly mixed with mercury, and the tailings, graded ore and mixed sand are cyanidated respectively
4. Single flotation flowsheet this flowsheet is suitable for the treatment of sulfide gold bearing quartz vein ore, polymetallic gold bearing sulfide ore and carbon bearing (graphite) ore with fine gold particles and high floatability
5. The combined process of mercury mixing and flotation is to recover the coarse gold from the ore with mercury mixing, and then the tailings of mercury mixing are used for flotation. This process is suitable for single flotation ore, gold bearing oxide ore and associated free gold ore. The recovery rate of this process is higher than that of single flotation process
6. In the whole slime cyanidation (direct cyanidation) process, gold is proced in quartz vein ore in the form of fine or fine particle dispersion, and the ore is oxidized deeply, and does not contain Cu, as, Sb, Bi and carbonaceous substances. This kind of ore is most suitable for the whole slime cyanidation process
cyanidation is one of the main methods to extract gold and silver. This method has the advantages of high recovery rate, strong adaptability to ore and local proction of gold, so it has been widely used
gold extraction by cyanidation consists of four steps: leaching of gold bearing ore in cyanidation solution, separation of gold bearing precious solution from leaching resie, precipitation of gold leaching and smelting of gold slime. The disadvantage of this method is that cyanide is highly toxic and easy to pollute the environment. In practice, we must strictly do a good job in environmental protection and governance
7. The flotation cyanidation process has the following three schemes:
(1) flotation cyanidation process. It is suitable for the treatment of gold bearing quartz vein ore and quartz pyrite ore which are closely associated with gold and sulfide< (2) flotation roasting cyanidation process. The process is suitable for the treatment of floatable minerals harmful to cyanidation, with only a small amount of gold combined with this mineral
8. Flotation gravity separation combined flowsheet this flowsheet is mainly flotation method, which is suitable for the ores with close coexistence of gold and sulfide and can only recover gold by smelting method. It is also suitable for gold bearing quartz vein ore with uneven coarse accumulation and distribution, and has higher recovery than single flotation
9. Heap leaching heap leaching is a type of Cyanidation for gold extraction, which is suitable for the treatment of low-grade gold ore. The main advantages are simple process, less investment and low cost
the above nine processes are principle processes, and their internal structure should be different according to the different types and properties of ores
no matter which kind of ore contains coarse-grained gold, the principle of early recovery and more recovery should be implemented. Before the ore enters the flotation operation, gravity separation, mercury mixing or single cell flotation should be used to recover coarse-grained gold in time
Gongyi Longtai Machinery Manufacturing Co., Ltd., specializing in the proction of mineral processing equipment, welcome to purchase!

3. Sand gold, is proced in the bottom of the river or low-lying areas, so mixed with sand, after washing out the gold. Sand gold originated from the mine, because the gold ore exposed to the ground, after a long period of wind and rain, the rock disintegrated and disintegrated in the north, the gold separated from the vein, accompanied by the sediment down the water, naturally settled in the sand, deposited in the bottom of the river or under the sand as a gold bearing layer, thus forming sand gold. The characteristics of Shajin are: different particle sizes, big like broad beans, small like fine sand, different shapes. The color varies with the fineness. More than 90% of the color is reddish yellow, 8% is light yellow, and 7% is cyan yellow

the content of gold in the ore is very low. In order to extract gold, it is necessary to crush and grind the ore and preconcentrate or separate gold from the ore by mineral processing. Gravity separation and flotation are widely used in gold beneficiation. Gravity separation plays a very important role in the proction of placer gold beneficiation equipment and placer gold beneficiation equipment. Flotation method is widely used in rock gold mines. At present, about 80% of rock gold mines in China adopt this method for gold beneficiation. The level of placer gold beneficiation equipment, placer gold beneficiation equipment and equipment has been greatly improved< According to the investigation, most gold concentrators in China use jaw crusher for coarse crushing, standard cone crusher for medium crushing, and short head cone crusher and counter roller crusher for fine crushing. Medium and small gold concentrators mostly adopt two-stage one closed circuit crushing process, while large gold concentrators adopt three-stage one closed circuit crushing process
in order to improve the mineral processing capacity of placer gold processing equipment and sand gold processing equipment and tap the potential of the equipment, the crushing process has been reformed to improve the utilization coefficient of the grinding machine. The main measures adopted are more crushing and less grinding to rece the particle size of the incoming grinding stone< (2) placer gold processing equipment, placer gold processing equipment gravity separation
gravity separation is widely used in rock gold mines, mostly as an auxiliary process to recover coarse gold in grinding circuit, creating favorable conditions for flotation and cyanidation process, improving beneficiation index, increasing the total recovery of gold, and playing a positive role in increasing output and recing cost. More than 10 gold concentrators in Shandong Province have adopted the gravity separation process. The average total recovery rate can be increased by 2% ~ 3%. The economic benefit of the enterprise is good. According to incomplete statistics, the annual profit can be several million yuan. Henan, Hunan, Inner Mongolia and other provinces (regions) have also achieved good results, the main equipment used are chute, shaker, jig and short cone cyclone. From the view of most gold mines in China, the flotation gravity combined process (gravity separation for flotation tailings) is suitable for use. In the future, it is necessary to vigorously promote the stage grinding stage separation process and advocate the principle of early recovery< According to the survey, about 80% of China's rock gold mines adopt flotation method for gold separation, and the concentrate proced is mostly sent to non-ferrous smelters for treatment. Due to the increasing development of cyanidation and in order to improve the economic benefit and rece the loss of concentrate transportation, the proct structure has changed greatly in recent years. Most of them adopt on-site treatment (of course, because of the contradiction between beneficiation and metallurgy and pricing problems, the mine is forced to treat on-site), which promotes the great development of flotation technology and occupies an important position in gold proction. There are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly. According to the investigation results of flotation process indexes of more than 40 gold concentrators in China, the flotation recovery rate of sulfide ore is 90%, and a few of them are as high as 95% ~ 97%; The recovery of oxide ore is about 75%; Some of them are 80% - 85%. In recent years, there are a lot of innovation and scientific research achievements in flotation process, and the effect is obvious. Stage grinding flotation process and gravity flotation combined process are the main trend of flotation technology development in China. For example, in a gold mine in Hunan Province, the combined gravity flotation process was used for stage grinding and stage separation, and the recovery rate was increased by more than 6%. Another example is Xincheng Gold Mine, where the original flowsheet is direct flotation of raw ore. e to the high mud content of the ore itself and the insufficient cemented filling strength of mining tailings, some mud and sand are brought in, the beneficiation indexes continuously decrease. Through investigation and test, the process flow of mud sand separation is adopted, the recovery rate is increased by 95.01% from 93.05%, and the concentrate grade is increased from 135g / T to 140g / T, which stabilizes the proction. Because the grade of raw ore in Jinchangyu Gold Mine is decreasing year by year, the flotation index is reced. Through the cooperation with Shenyang Gold Institute and other units, the branch flotation process is adopted, and the flotation index and concentrate grade are improved. Of course, like other methods, flotation method is not omnipotent, and it is impossible to be effective for all gold bearing ores. The ore properties should be mainly considered. When selecting the technological process, it is necessary to carry out various demonstrations and tests< br />

4. A complete set of beneficiation and metallurgy process

Gold beneficiation

crushing and grinding of gold ore

the content of gold in the ore is very low. In order to extract gold, it is necessary to crush and grind the ore and preconcentrate or separate gold from the ore by mineral processing. According to the investigation, jaw crusher is often used in China's gold concentrators for coarse crushing, standard cone crusher for medium crushing, and short head cone crusher and counter roller crusher for fine crushing. Medium and small gold concentrators mostly adopt two-stage one closed circuit crushing process, while large gold concentrators adopt three-stage one closed circuit crushing process<

Gold beneficiation gravity separation technology

gravity separation and flotation are widely used in gold beneficiation, and gravity separation plays a very important role in placer gold proction

gravity separation is widely used in rock gold mines. It is mostly used as an auxiliary process to recover coarse gold in grinding circuit, which creates favorable conditions for flotation and cyanidation process, improves beneficiation indexes, increases the total recovery of gold, and plays a positive role in increasing output and recing cost<

more than 10 gold concentrators in Shandong Province have adopted gravity separation process, the average total recovery rate can be increased by 2% ~ 3%, and the enterprise has good economic benefits. According to incomplete statistics, it can make a profit of several million yuan per year. Henan, Hunan, Inner Mongolia and other provinces (regions) have also achieved good results, the main equipment used are chute, shaker, jig and short cone cyclone<

Gold beneficiation - flotation technology

flotation method is widely used in rock gold mines. According to the survey, about 80% of rock gold mines in China adopt flotation method for gold separation, and the concentrate proced is mostly sent to gold smelters for treatment

there are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly. According to the investigation results of flotation process indexes of more than 40 gold concentrators in China, the flotation recovery rate of sulfide ore is 90%, and a few of them are as high as 95% ~ 97%; The recovery of oxide ore is about 75%; Some of them are 80% - 85%

in recent years, there are a lot of innovation and scientific research achievements in flotation process, and the effect is obvious. Stage grinding flotation process and gravity flotation combined process are the main trend of flotation technology development in China. For example, Xiangxi Gold Mine adopts gravity flotation combined process to grind ore in stages and separate ore in stages, which can obtain better indexes and increase recovery by more than 6%; Jiaojia gold mine, Wulong gold mine, Wenyu Gold Mine and Dongchuang gold mine have also achieved certain results

of course, like other methods, flotation method is not omnipotent, and it is impossible to be effective for all gold bearing ores. The ore properties should be mainly considered, and various argumentation and tests should be carried out when selecting the technological process. In recent years, in order to improve the separation effect, in the process of continuous improvement, many improvements and researches have been made on the reagent addition system and mixed medication, and new progress has been made in the automatic control of dosing<

gold extraction process of gold beneficiation

gold extraction by mixed mercury method

mixed mercury method is an ancient gold extraction process, which is simple, economical and suitable for the recovery of coarse-grained monomer gold. This method is still used in many gold mines in China. With the development of gold proction and the progress of science and technology, the process of extracting gold by mixed mercury method has been improved and perfected. Due to the increasingly stringent requirements of environmental protection, some mines have cancelled the mercury mixing operation and replaced it by gravity separation, flotation and cyanidation

in the proction of gold, the process of extracting gold by mixed mercury method still plays an important role, and has been applied at home and abroad. At present, this technology has been applied in many gold mines, such as Zhangjiakou, Hebei, Ergou, Liaoning, Jiapigou, Jilin and Yinan, Shandong. Liaoning Ergou gold mine was originally a single flotation process. According to the nature of ore, it was changed into a combined process of mixed mercury and flotation. The total recovery was increased by 78.1% (the recovery of mixed mercury was 64.6%), the grade of tailings was reced from 0.74g/t to 0.32g/t, and the annual benefit was 1.58 million yuan. The key to the process of gold extraction by mixed mercury method is how to take protective measures to eliminate mercury pollution<

cyanidation gold extraction process

cyanidation gold extraction process is the main method to extract gold from ore or concentrate. The process of gold extraction by cyanidation includes: cyanidation leaching, washing and filtration of leaching pulp, extraction of gold from cyanidation solution or cyanidation pulp and smelting of finished procts. There are two kinds of gold extraction processes in the existing cyanidation plants of gold mines in China. One is the so-called conventional cyanidation process (CCD method and CCF method) in which the thickener is used for continuous countercurrent washing and zinc powder is used to replace the precipitation to recover gold. The other is that there is no need for filtration and washing, CIP process and CIL process were used to recover gold from cyanide pulp directly by activated carbon adsorption< The conventional cyanidation process can be divided into two types according to the different materials: one is the cyanidation plant which processes flotation gold concentrate or mixed mercury and gravity tailings. Most of them are large state-owned mines. For example, Jinchangyu in Hebei Province; Wulong, Liaoning, Yangzhaiyu, Henan; Zhaoyuan, Xincheng, Jiaojia and Sanshan gold mines in Shandong Province. The other is a gold extraction plant which processes argillaceous oxide ore and uses whole slime stirring cyanidation. Such as Jilin trench; Tuanjiegou, Heilongjiang Province; Xinqiao gold and silver mine in Anhui Province. As early as 1930s, cyanidation process has been used in China. During 1936-1938, Jinguashi gold mine in Taiwan used cyanidation zinc powder replacement process to extract gold with an annual output of 150000 taels. After entering the 1960s, in order to adapt to the development of national economy and vigorously develop the proction of mineral gold, the intermittent mechanical agitation cyanidation process and continuous agitation cyanidation process were successively adopted in some mines to replace the percolation cyanidation process. In 1967, the continuous mechanical agitation cyanidation process was first realized in Lingshan and Linglong gold concentrators of Zhaoyuan gold mine, Shandong Province. The cyanidation rate increased from 70% to 93.23%. Since then, the continuous mechanical agitation cyanidation process has been rapidly promoted in major gold mines in China

in recent years, new progress has been made in the scientific research of new processes such as thiourea extraction, thiosulfate extraction, preoxidation bacterial leaching, pressure catalytic leaching and resin adsorption. In 1979, Changchun Gold Research Institute successfully carried out the test of thiourea gold extraction. In 1984, a thiourea gold extraction workshop was built in Longshui mine, Guangxi, with a daily processing capacity of 10-20t of flotation gold concentrate. Although other processes are in the stage of experimental research and are preparing to be put into operation, it is enough to show that the gold extraction technology in China has developed to a new level< In China's gold resources, low-grade oxidized ores account for a certain proportion, so it is not economical to use the conventional cyanidation process to extract gold from such ores, but the heap leaching process still has economic benefits. At the end of 1970s, China began to study the heap leaching process of low-grade gold bearing oxide ore. after the successful small-scale proction of Hushan gold mine in Dandong, Liaoning Province, it was successively applied in some mines in Linghu, Yindongpo, Mojiang, Chongli, Hebei, Chifeng, Inner Mongolia and other areas, with satisfactory economic results, It opens up a way for the development and utilization of low grade gold bearing oxide ore. The heap leaching process has developed rapidly because of its simple process, easy operation, low investment, good benefit and fast start-up. The application of granulation technology and activated carbon adsorption column, as well as the development of gold loaded carbon desorption electrodeposition process, have added new vitality to the popularization and application of heap leaching gold extraction process<

gold smelting and recovery

gold smelting is the last process in gold proction, and its proct is finished gold. Smelting can be divided into roughing and refining. The refined and rough procts are alloy (commonly known as quality gold). Most of the local gold in China's gold mines is quality gold, which is sold directly to banks. Gold rich ore blocks and various gold concentrates are transported to non-ferrous smelters for processing and refining of finished gold (commonly known as gold content). Over the past 40 years since the founding of the people's Republic of China, gold smelting and comprehensive recovery have developed rapidly, the level of smelting technology and equipment has been continuously improved, and the smelting cost has been decreasing, which has promoted the development of gold proction< Before the 1970s, gold proction was in the initial stage of development. Except for a few mines which began to use cyanidation process, the local gold was mainly smelted from natural gold and concentrate from placer gravity separation and mercury paste from mixed mercury process, Local gold accounts for only 30% of the total output, and 70% of the gold is recovered by nonferrous smelters< Since 1970, gold proction has been developing graally, cyanidation technology has been widely used, and the amount of local gold in mines has been increasing. In 1985, the output of finished gold in mines accounted for 70% of the national gold output, and most of the concentrate procts proced by concentrators were proced by cyanidation

the traditional crucible method is mostly used for in-situ smelting in mines. Due to the different proction process and material properties, the gold content of the resultant gold is also different. Because the gold content is not high or the silver content is not priced, some mines adopt the chemical method to remove impurities, remelting or electrolysis method to separate and refine gold and silver in order to improve the quality and economic benefits

recovery of associated gold in nonferrous smelters

in gold proction, the recovery of associated gold from polymetallic ore occupies a considerable position. Gold, copper, lead and other non-ferrous metals are selected into the concentrate. In copper and lead smelting, gold and silver are recovered. In order to increase gold proction, some non-ferrous smelters in China have built comprehensive precious metal recovery workshops. By 1985, there were more than 20 smelters in China. In addition to Shenyang smelter, Zhuzhou Smelter, Shanghai smelter, Yunnan Smelter, Chongqing smelter, Wuhan smelter, Fuchunjiang smelter, Tianjin smelter, Taiyuan smelter, etc. Among them, the output of associated gold in the three major smelters of Shenyang smelter, Shangye smelter and Zhuzhou Smelter accounts for more than 90% of the total output of associated gold in China, which is an important force in China's gold proction. The recovery of associated gold in these enterprises is based on the fact that in the process of copper and lead smelting, gold and silver are enriched in the crude copper and lead. During the electrolytic refining of crude copper and lead, gold and silver are deposited in the electrolytic anode slime. Therefore, extracting gold and silver from the anode slime is the main way to recover associated gold and silver.

5. Sand gold, is proced in the bottom of the river or low-lying areas, so mixed with sand, after washing out the gold. Sand gold originated from the mine, because the gold ore exposed to the ground, after a long period of wind and rain, the rock disintegrated and disintegrated in the north, the gold separated from the vein, accompanied by the sediment down the water, naturally settled in the sand, deposited in the bottom of the river or under the sand as a gold bearing layer, thus forming sand gold. The characteristics of Shajin are: different particle sizes, big like broad beans, small like fine sand, different shapes. The color varies with the fineness. More than 90% of the color is reddish yellow, 8% is light yellow, and 7% is cyan yellow
the content of gold in the ore is very low. In order to extract gold, it is necessary to crush and grind the ore and preconcentrate or separate gold from the ore by mineral processing. Gravity separation and flotation are widely used in gold beneficiation. Gravity separation plays a very important role in the proction of placer gold beneficiation equipment and placer gold beneficiation equipment. Flotation method is widely used in rock gold mines. At present, about 80% of rock gold mines in China adopt this method for gold beneficiation. The level of placer gold beneficiation equipment, placer gold beneficiation equipment and equipment has been greatly improved< According to the investigation, most gold concentrators in China use jaw crusher for coarse crushing, standard cone crusher for medium crushing, and short head cone crusher and counter roller crusher for fine crushing. Medium and small gold concentrators mostly adopt two-stage one closed circuit crushing process, while large gold concentrators adopt three-stage one closed circuit crushing process
in order to improve the mineral processing capacity of placer gold processing equipment and sand gold processing equipment and tap the potential of the equipment, the crushing process has been reformed to improve the utilization coefficient of the grinding machine. The main measures adopted are more crushing and less grinding to rece the particle size of the incoming grinding stone< (2) placer gold processing equipment, placer gold processing equipment gravity separation
gravity separation is widely used in rock gold mines, mostly as an auxiliary process to recover coarse gold in grinding circuit, creating favorable conditions for flotation and cyanidation process, improving beneficiation index, increasing the total recovery of gold, and playing a positive role in increasing output and recing cost. More than 10 gold concentrators in Shandong Province have adopted the gravity separation process. The average total recovery rate can be increased by 2% ~ 3%. The economic benefit of the enterprise is good. According to incomplete statistics, the annual profit can be several million yuan. Henan, Hunan, Inner Mongolia and other provinces (regions) have also achieved good results, the main equipment used are chute, shaker, jig and short cone cyclone. From the view of most gold mines in China, the flotation gravity combined process (gravity separation for flotation tailings) is suitable for use. In the future, it is necessary to vigorously promote the stage grinding stage separation process and advocate the principle of early recovery< According to the survey, about 80% of China's rock gold mines adopt flotation method for gold separation, and the concentrate proced is mostly sent to non-ferrous smelters for treatment. Due to the increasing development of cyanidation and in order to improve the economic benefit and rece the loss of concentrate transportation, the proct structure has changed greatly in recent years. Most of them adopt on-site treatment (of course, because of the contradiction between beneficiation and metallurgy and pricing problems, the mine is forced to treat on-site), which promotes the great development of flotation technology and occupies an important position in gold proction. There are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly. According to the investigation results of flotation process indexes of more than 40 gold concentrators in China, the flotation recovery rate of sulfide ore is 90%, and a few of them are as high as 95% ~ 97%; The recovery of oxide ore is about 75%; Some of them are 80% - 85%. In recent years, there are a lot of innovation and scientific research achievements in flotation process, and the effect is obvious. Stage grinding flotation process and gravity flotation combined process are the main trend of flotation technology development in China. For example, in a gold mine in Hunan Province, the combined gravity flotation process was used for stage grinding and stage separation, and the recovery rate was increased by more than 6%. Another example is Xincheng Gold Mine, where the original flowsheet is direct flotation of raw ore. e to the high mud content of the ore itself and the insufficient cemented filling strength of mining tailings, some mud and sand are brought in, the beneficiation indexes continuously decrease. Through investigation and test, the process flow of mud sand separation is adopted, the recovery rate is increased by 95.01% from 93.05%, and the concentrate grade is increased from 135g / T to 140g / T, which stabilizes the proction. Because the grade of raw ore in Jinchangyu Gold Mine is decreasing year by year, the flotation index is reced. Through the cooperation with Shenyang Gold Institute and other units, the branch flotation process is adopted, and the flotation index and concentrate grade are improved. Of course, like other methods, flotation method is not omnipotent, and it is impossible to be effective for all gold bearing ores. The ore properties should be mainly considered. When selecting the technological process, it is necessary to carry out various demonstrations and tests< br />

6. There are three main ways to refine gold ore, one is between kuzai, the other is between reservoirs and between fat barrels. These refineries are not only operated by Taiyang company, but also run by the people
kuzijian, also known as shangkuangjian, is a place for refining shangkuang or Xizhong ore
1. The ore is crushed with iron mortar or gravel machine, and then put into the rolling groove to add mercury to form fine sand
2. The fine sand containing mercury and gold is laid on the upper end of the gold tank and cleaned with water. With different specific gravity, the sand and stone particles will be washed into the collection basin, and the Mercury will stay on the upper end of the gold tank
3. Pick out the mercury and gold, collect the sand and stone in the basin, and then repeatedly use the rolling groove and gold groove to collect until the gold and sand content graally decreases
4. Wrap the collected mercury gold with cotton cloth and screw out too much mercury
5. Put the mercury gold into the crucible and heat it to make the mercury evaporate to get the crude gold
the hair barrel is mainly used for refining fine gold sand or ore tailings left after ore charging and refining
Step 1:
1. First, crush the ore tailings, add fine sand and lime, mix them evenly, put them into the hair barrel together, fill them with water, and place them for one day and one night
2. Let out the water in the barrel, add sodium cyanide and keep it for one day and one night to dissolve the ore into liquid
3. When the liquid in the barrel is introced into the wooden box with the leaded wire, gold, silver, copper and other metals will adhere to the surface of the leaded wire and precipitate
4. Add sulfuric acid to dissolve the gold and silver precipitate into a thick solution, and then filter out the slime containing metal components with filter paper and cotton cloth< Step 2:
1. Dry the slime, then add soda and borax
2. Pour the liquid into the crucible, heat the coking coal to 1300 ~ 1400 ℃ to make the metal melt into liquid, pour the liquid into the iron mortar to make it naturally condense into a solid, and then knock down the solid containing gold at the bottom (because of the large proportion of gold, the composition containing gold will condense at the bottom)
Step 3: put the gold containing solid into the slag removal furnace, while heating, while blowing cold with air< If the excavated ore belongs to medium and flat mines, it will be piled up in the pit, waiting for scheling, and then sent to the tamping yard near the entrance (commonly known as water workshop). During the process of collection and refining:
1. The ore is carried into the mortar by manpower, and the water is added to make the pestle rotate up, down, left and right. The crushed ore and the water in the mortar turn into pulp. Along the water flow, the pulp goes through the filter screen, and then stays in the blanket. At this time, according to the specific gravity, the ore liquid is left in the first, second and third blanket or is taken away by the water. Collect the ore by staying on the blanket about every 30 minutes to 1 hour
2. Collect ore:
step1. Put the sand on the first blanket into the gold bath and wash it repeatedly to collect gold
Step 2. Lead blanket: the mineral sand on the second and third blankets should be screened by "lead blanket sand", and then taken to the gold trough to collect gold sand. The method is to put the mineral sand into the plate groove covered with a blanket, pour it into the washing, and the heavier mineral sand will stay on the top of the blanket. This step is called pulling blanket sand. The collected ore is washed repeatedly with gold bath to collect gold sand< The process is as follows:
1. When the temperature drops slightly, pour the liquid into the water rapidly, and make the water rotate at the same time. When the metal liquid meets the water, it will condense into gold and silver alloys one by one
2. Put the alloy into an iron pot, add nitric acid to boil, melt silver in nitric acid, then add water to clean, and collect silver nitrate solution to recover silver
3. Repeat step 2 until the color of gold chip becomes Brown
4. Add sulfuric acid to boil to dissolve other impurities. Then wash it repeatedly with water to get pure gold
5. After drying, add appropriate amount of borax and nitre, and then melt them in crucible
6. Pour into the mold and cool to form pure gold strips. Repeat 1312132