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Process method for respectively recovering nickel and iron from low-nickel high-iron laterite

A technology of lateritic nickel ore and process method, which is applied in the field of direct reduction to separately recover ferronickel powder and direct reduction iron powder, which can solve the problems that iron and nickel cannot be recovered at the same time, and achieve improved resource utilization, low price, and high economic benefits Effect

Active Publication Date: 2012-07-25
江苏荣鑫伟业新材料股份有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem that iron and nickel in the existing low-nickel and high-iron laterite nickel ore cannot be recovered at the same time. Coal is used as the reducing agent, and additives are added for reduction roasting. Iron powder and direct reduced iron powder are two products, so as to achieve the purpose of simplifying the process, saving investment and realizing the comprehensive utilization of resources

Method used

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  • Process method for respectively recovering nickel and iron from low-nickel high-iron laterite
  • Process method for respectively recovering nickel and iron from low-nickel high-iron laterite

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Embodiment 1

[0014] A lateritic nickel ore contains 1.48% nickel and 33.56% iron, which belongs to low-nickel and high-iron lateritic nickel ore, and the nickel mainly exists in silicate. The reduction roasting conditions of recovered ferronickel powder are as follows: the amount of reducing agent coal is 5%; the amount of additive is 20%; the additive used is a mixture of sodium hydroxide and calcium chloride, the ratio is 1:0.5; Reduction roasting at 1100°C for 40 minutes in the furnace; cooling; grinding to a particle size of -0.076mm accounting for 90% at a mass concentration of about 60%, and magnetic separation at a magnetic field strength of 1.8kGs. Nickel-iron powder with a nickel grade of 10.61% and a nickel recovery rate of 80.71% can be obtained, and the grade of iron in the magnetic separation tailings can be increased to 37.35%. Then add 8% binder (bentonite: quicklime = 3:1) and 25% coal as reducing agent pressure balls to the magnetic separation tailings, and reduce and roas...

Embodiment 2

[0016] A laterite nickel ore contains 1.42% nickel and 29.29% iron, which is a low-nickel and high-iron laterite nickel ore. The reduction roasting conditions of recovered ferronickel powder are as follows: the amount of reducing agent coal is 5%; the amount of additive is 10%, and the additive used is a mixture of sodium hydroxide and calcium chloride in a ratio of 1:0.5; Reduction roasting in the furnace at 1150°C for 50 minutes, after cooling, grind at a concentration of about 60% to a particle size of -0.076mm accounting for 95%, and magnetically separate under a magnetic field strength of 2.0kGs. Obtain nickel-iron powder with a nickel grade of 10.21% and a nickel recovery rate of 80.23%, and the grade of iron in the magnetic separation tailings is increased to 30.21%. Then add 7% binder (bentonite: quicklime = 3:1), and then add 23% coal as reducing agent to press balls, reduce and roast at 1200°C for 45 minutes, and the roasted balls are subjected to two-stage grinding ...

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Abstract

The invention belongs to the field of resource utilization and relates to a process method for respectively recovering nickel and iron from low-nickel high-iron laterite. Compared with a conventional method for simultaneously recovering the nickel and the iron for producing nickel and iron alloy ore concentrates, the process method is characterized in that two products of high-nickel-content nickel iron powder and directly reduced iron powder can be respectively obtained through two-step reduction roasting, and the respective recovery on the nickel and the iron can be realized. The process method is characterized in that the process method per se is simpler than other methods, coal powder with low use cost is directly used as reducing agents, and the application of coke with higher use cost is avoided; the simultaneous completion of nickel recovery and iron inhibition can be realized through the reducing agents and additives, and the iron reduction is inhibited during ensuring the nickel recovery rate; and finally, the nickel iron powder with the nickel grade higher than 10 percent and the directly reduced iron powder with the iron grade higher than 90 percent are obtained, and the recovery rates of the nickel and the iron are generally higher than 80 percent.

Description

technical field [0001] The invention belongs to the field of resource utilization, and relates to a process method for recovering ferronickel powder and direct reduction iron powder respectively through direct reduction from low-nickel and high-iron laterite nickel ore. The process mainly uses coal as the reducing agent, and adds additives to the low-nickel and high-iron laterite nickel ore, and then adopts selective reduction roasting-magnetic separation to recover ferronickel powder, and the tailings are recovered by direct reduction roasting to recover direct reduced iron powder method. technical background [0002] my country is in the stage of industrialization. With the acceleration of economic development, the demand for nickel is also increasing. Since 2005, China has replaced Japan as the country with the largest nickel consumption in the world. At present, 65% of the world's nickel is used to produce stainless steel. With the rapid development of the stainless s...

Claims

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Application Information

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IPC IPC(8): C22B1/02B03C1/015C22B23/00C21B13/00
Inventor 孙体昌张建华蒋曼寇珏刘志国张士元
Owner 江苏荣鑫伟业新材料股份有限公司