Investment promotion of laterite nickel ore sintering machine
It involves two aspects:
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the company does not transfer out the medical insurance card, but continues to pay for you: you can't transfer out personally, so you need to transfer out from the company
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the company did not transfer out the medical insurance card, and did not continue to pay, so that the medical insurance card is in arrears: take your personal identity and bank card, and you can transfer out after paying your arrears The medical insurance center involves the operation of several departments, and the specific departments have to be asked on site. I remember when I did it, I went to the director of medical insurance to issue certificates, to the finance department to pay, and then to the window office to transfer out.)
suppose that we can proce 1200 tons of sinter 24 hours a day
1. The daily output of 1200 tons of new rectangular sintering machine is about 6 million yuan without environmental protection equipment, and the investment of traditional sintering machine is about 5.5-12 million yuan
2. The installed capacity of the traditional sintering machine is about 3100kwh (charged desting), while that of the new sintering machine is 1600kwh. Assuming that the electricity charge is 0.6 yuan, it can save 20000 yuan per day
3. If the air volume of traditional sintering machine is 6000 cubic meters per minute, and that of new sintering machine is 2000 cubic meters per minute, about 2 million yuan investment will be saved in electrostatic precipitator and bag filter
4. The consumption of coal powder of traditional sintering machine is as high as 10% per ton of sinter, while the consumption of coal powder of new sintering machine is about 5%. Only for this, the sintering machine can save 60 tons of coal powder, equivalent to RMB 60000 per day
5. The traditional sintering machine needs to use gas for ignition. The sintering machine with a daily output of 1200 tons of sinter needs about 9000 yuan of gas per day, while the new sintering machine does not use gas
6. In terms of scalability, e to the small amount of flue gas, the new sintering machine will not be put into operation again in the future
comprehensive analysis shows that the application of the new sintering machine can increase the annual income of the enterprise by more than 20 million e to its energy saving in gas, coal and electricity.
Sintering machine is not a machine, but a project composed of several processes. Take the 48 square meter laterite nickel ore sintering machine project of Jinye Metallurgical Equipment Manufacturing Co., Ltd. as an example:
the main process of sintering machine is composed of the following parts:
quicklime crushing room, coal (coke) powder crushing room, batching warehouse, primary mixer room, secondary mixer room, 70m2 sintering machine room Binder, heat breaker, screening chamber, etc
batching warehouse
raw material warehouse (60) × Two 50 type loaders and one 5 * 8m sliding screen are set for drying and screening of raw ore mixed lime. They are used as the reserve material storehouse for sinter proction. There are six silos in the storehouse. The ore powder and fuel are proportioned by electronic scale and flux by screw feeder according to the set proportion and then sent to the mixer room by the main proportioning belt
mixing room
mixing room φ two point two × Two 9m mixers are used to add water to a certain humidity and mix the incoming materials well. In the second mixture, the mixture is pelletized and the mixture is heated
sintering chamber
the mixture is evenly distributed in the mixing bin along the length direction by shuttle distributor, and then the mixture is evenly distributed on the 1.5m wide sintering plate by the combination of round roller distributor and multi roller distributor, and then it is fed into the igniter along with the rotation of the plate. The mixture preheated by hot air is heated and ignited by the burning high temperature flue gas. Under the action of negative pressure ventilation, the mixture burns downward with the trolley moving forward, and the physical and chemical changes are completed at the tail of the machine, and the hot sinter is fired φ one point five × 2.0 m single roll crushing falls into the screening system
quick lime crushing chamber
the large pieces of quick lime passing the inspection are sieved to & lt; 3mm> 85% of the lime powder is sent into the flux bin, weighed and digested before batching
coal (coke) powder crushing chamber; 3mm> 85% of the fuel powder is sent into the fuel bin, and then weighed and fed to participate in the batching<
process flow
laterite nickel ore bin (3) fuel bin (1) flux bin (1)
↓ ↓
disc feeder + belt scale disc feeder + belt scale screw feeder
↓ ↓
- - - → B = 650 main batching belt ← -
↓
water → primary mixer φ two thousand and two hundred × 9000
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water + steam → secondary mixer φ two thousand and two hundred × 9000
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b = 650 mixture belt Gallery
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shuttle distributor
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mixture bin
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round roller distributor
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multi roller distributor
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chimney ← exhaust fan ← cyclone st collector ← 48m2 sintering machine ← igniter ← gas + combustion fan
single roller crusher φ one thousand and five hundred × 2000 ← cooling water
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cyclone st collector ← sinter storage bin ← exhaust fan (1 set)
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finished sinter belt or electric furnace bin
suppose that we can proce 1200 tons of sinter 24 hours a day
1. The daily output of 1200 tons of new type rectangular sintering machine is about 6 million yuan without environmental protection equipment, and the investment of traditional sintering machine is about 5.5-12 million yuan
2. The installed capacity of the traditional sintering machine is about 3100kwh (charged desting), while that of the new sintering machine is 1600kwh. Assuming that the electricity charge is 0.6 yuan, it can save 20000 yuan per day
3. If the air volume of traditional sintering machine is 6000 cubic meters per minute, and that of new sintering machine is 2000 cubic meters per minute, about 2 million yuan investment will be saved in electrostatic precipitator and bag filter
4. The consumption of coal powder of traditional sintering machine is as high as 10% per ton of sinter, while the consumption of coal powder of new sintering machine is about 5%. Only for this, the sintering machine can save 60 tons of coal powder, equivalent to RMB 60000 per day
5. The traditional sintering machine needs to use gas for ignition. The sintering machine with a daily output of 1200 tons of sinter needs about 9000 yuan of gas per day, while the new sintering machine does not use gas
6. In terms of scalability, e to the small amount of flue gas, the new sintering machine will not be put into operation again in the future
comprehensive analysis shows that the application of the new sintering machine can increase the annual income of the enterprise by more than 20 million e to its energy saving in gas, coal and electricity.
(1) ammonia leaching process (Caron process)
the instry of treating nickel oxide ore by wet process began in the 1940s. Ammonia leaching process was first used, that is, nickel oxide ore was dried, reced and roasted, and then subjected to multi-stage atmospheric ammonia leaching. The representative plant is Cuba Nicaro nickel plant built in the United States. Ammonia leaching process is not suitable for the treatment of nickel oxide ore with high copper and cobalt content, as well as Si Mg Ni sintered nickel, nickel powder and nickel block. New Caledonian nickel oxide ore is only suitable for the treatment of laterite on the surface, which greatly limits the development of ammonia leaching process. In addition, the recovery rate of nickel and cobalt in ammonia leaching process is low. The recovery rate of nickel and cobalt in the whole process is only 75-80% and 40-50% respectively. So far, only four factories in the world have adopted ammonia leaching process to treat nickel oxide ore, and they were all built before the 1970s. For more than 30 years, no new factory has adopted ammonia leaching process< (2) acid leaching method
under the condition of 250-270 ℃, 4-5 MPa High Temperature and high pressure, nickel, cobalt and other valuable metals are dissolved together with iron and aluminum minerals with dilute sulfuric acid. In the subsequent reaction, the impurity elements such as iron, aluminum and silicon are hydrolyzed into the slag under certain conditions such as pH value, and nickel and cobalt are selectively added into the solution, from which solvent extraction is used Sulfur precipitation technology recovery< The instrial proction of treating nickel oxide ore by acid leaching process began in the 1950s. At that time, the representative factory was the MAOA nickel smelter in Cuba, which was also designed and built by the United States. Acid leaching process is suitable for the treatment of nickel oxide ore with low magnesium content. Excessive magnesium content in ore will increase acid consumption, increase operation cost and affect the process. If the cobalt content in the ore is high, the acid leaching process is more suitable. Not only the leaching rate of cobalt is higher than that of ammonia leaching process, but also the unit proction cost of acid leaching process is greatly reced because the value of drill is higher than that of nickel. Although the nickel leaching rate of high-pressure acid leaching can reach more than 90%, but the acid leaching process is also restricted by the ore conditions. At present, there are only three factories in the world that use the acid leaching method to treat nickel oxide ore, and because the treatment conditions of high temperature and high pressure are strict on the equipment, the operation is not very normal. Generally speaking, the development of acid leaching process is not mature< At present, there is only the dayama smelter of Nippon yakim in the world, which is used to treat nickel oxide by the combined process of pyrometallurgy and hydrometallurgy. The main process is as follows: the raw ore is milled and pulverized coal is mixed to form a pellet, the pellet is dried and high-temperature reced roasting, the roasted ore pellet is grinded again, and the slurry is beneficiated (gravity separation and magnetic separation) to obtain nickel iron alloy procts. The biggest feature of this process is low proction cost, 85% of energy consumption is provided by coal, and coal consumption per ton of mine is 160-180kg. More than 80% of the energy consumption of electric furnace smelting in Pyrometallurgical process is provided by electric energy, and the power consumption per ton of ore is 560-600 kwh. The difference between the two energy consumption costs is very large. According to the current domestic market value, the difference between the two prices is 3-4 times. However, there are still many problems in this process. Although Dajiangshan smelter has been improved for many times, the process technology is still not stable. After decades, its proction scale is still around 10000 tons per year. The key technology of this process is to control the temperature of rection roasting process, such as mixing and preparation of pulverized coal and ore. From the point of view of energy saving, low cost and comprehensive utilization (treatment of low grade nickel oxide ore), this process is worthy of further study and promotion. Russian researchers have carried out experimental research on the flotation or magnetic separation of Urals nickel oxide ore by means of segregation roasting. They believe that it is the only method that can rece cost, save energy and increase nickel proction at present. It is suitable for treating any type of nickel oxide ore
pyrometallurgical process for procing ferronickel from nickel oxide ore has the advantages of short process and high efficiency, but high energy consumption. The largest component of its operating cost is energy consumption. If electric furnace smelting is adopted, the power consumption alone accounts for about 50% of the operating cost. In addition, the fuel consumption of drying and roasting pretreatment process before nickel oxide ore smelting, The energy consumption cost in the operation cost may account for more than 65%. Pyrometallurgical process is mainly used to treat high-grade nickel laterite because of the large amount of ore, high energy consumption and high smelting cost. At present, the main method to treat medium and low-grade nickel laterite ore is wet process. Although the cost is lower than pyrometallurgical process, the process of wet treatment of nickel oxide ore is complex, the process is long, and the process conditions require high equipment. To sum up, solving the problem of high energy consumption in Pyrometallurgical process and developing new wet process to treat medium and low grade nickel laterite will be the development direction of nickel smelting in the future.