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Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore

A laterite nickel ore and direct technology, applied in the field of metallurgy and chemical industry, can solve the problems of uneven mixing of materials, difficulty in implementation, and low grade of ferronickel products, so as to improve the degree of mixing and combination, improve the reduction efficiency, and the recovery rate of ferronickel is high Effect

Inactive Publication Date: 2014-09-10
章钦成 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is to grind the laterite nickel ore and then add the reducing agent and additives into the pressure ball. However, in actual production, it is found that if the laterite nickel ore, the reducing agent and the additive are not finely ground at the same time, the materials will be mixed unevenly and combined. Tight, the degree of reduction of laterite nickel ore in the rotary kiln is difficult to guarantee
In addition, the output material is extracted by strong magnetic after water quenching and grinding, and the product has a low grade of ferronickel and a large content of slag. This process is difficult to implement in actual production.

Method used

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  • Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore

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Effect test

Embodiment 1

[0031] (1) Raw ore: laterite nickel ore, its chemical composition: nickel 1.86%, iron 11.8%, magnesium oxide 24.7%, aluminum oxide 0.9%, silicon dioxide 42.5%, chromium oxide 1.0%;

[0032] (2) Process steps: Dry the laterite nickel raw ore, add 5.5% coal powder and 3% lime, mix and dry grind together to 200 mesh, accounting for 90%, press balls, the size of the pellets is 15mm, and the pellets are sent to preheat device, the preheating temperature is 350°C, and the time is 1.2h. After preheating, the pellets directly enter the rotary kiln for reduction and calcination. The temperature in the kiln is controlled at 1250-1300°C for 1 hour. The materials exiting the kiln are immediately water-quenched, crushed and ground to 2-3mm, and then enter the jig machine after screening to obtain Nickel-iron alloy grains. Under this process condition, the nickel-iron alloy contains 16.3% nickel, the recovery rate of nickel is 93.6%, and the recovery rate of iron is 91.8%.

Embodiment 2

[0034] (1) Raw ore: laterite nickel ore, its chemical composition: nickel 1.7%, iron 12.0%, magnesium oxide 25.2%, aluminum oxide 0.95%, silicon dioxide 43.2%, chromium oxide 0.8%;

[0035] (2) Process steps: Dry the laterite nickel raw ore, add 5% coal powder and 3.5% lime, mix and dry grind together to 200 mesh, accounting for 90%, press balls, the size of the pellets is 15mm, and the pellets are sent to preheat device, the preheating temperature is 370°C, and the time is 50 minutes. After preheating, the pellets directly enter the rotary kiln for reduction and calcination. The temperature in the kiln is controlled at 1300~1350°C for 1 hour. The materials exiting the kiln are immediately water-quenched, crushed and ground to 2~3mm, and then enter the jig machine after screening to obtain Nickel-iron alloy grains. Under this process condition, the nickel-iron alloy contains 15.7% nickel, the recovery rate of nickel is 95.4%, and the recovery rate of iron is 92.3%.

Embodiment 3

[0037] (1) Raw ore: laterite nickel ore, its chemical composition: nickel 1.86%, iron 11.8%, magnesium oxide 24.7%, aluminum oxide 0.9%, silicon dioxide 42.5%, chromium oxide 1.0%; by weight percentage

[0038] (2) Process steps: Dry the laterite nickel raw ore, add 5.5% coal powder and 3% lime, mix and dry grind together to 200 mesh, accounting for 90%, press balls, the size of the pellets is 15mm, and the pellets are sent to preheat The device is preheated at 400°C for 50 minutes. After preheating, the pellets directly enter the rotary kiln for reduction and calcination. The temperature in the kiln is controlled at 1300~1350°C for 1 hour. The materials exiting the kiln are immediately water-quenched, crushed and ground to 2~3mm, and then enter the jig machine after screening to obtain Nickel-iron alloy grains. Under this process condition, the nickel-iron alloy contains 16.0% nickel, the recovery rate of nickel is 93%, and the recovery rate of iron is 93%.

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Abstract

The invention discloses a method for producing nickel-iron particles by using a coal-based reducing agent to directly reduce laterite nickel ore, belongs to the technical field of metallurgy chemical engineering, and concretely relates to a method for producing nickel-iron particles by utilizing a rotary kiln to directly reduce laterite nickel ore. The method comprises: drying laterite nickel raw ore, adding coal and additives, mixing, performing dry grinding, and preparing balls; pre-heating, then sending into the rotary kiln and performing reduction calcining; performing water quenching on materials discharged from the kiln, then performing fragmentation and fine grinding, and then performing jigging separation, so as to obtain the nickel-iron particle product, and separating a magnetic material from a tail ore part discharged from a jigging machine by using a magnet separator, returning to the kiln for reutilization. Waste heat of the tail gas of the rotary kiln is used to perform preheating drying on the raw material. The method has the characteristics of simple production, convenient operation, low energy consumption, environment friendliness and high nickel-iron recovery rate.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and specifically relates to a method for directly reducing laterite nickel ore to produce ferronickel pellets by using a coal-based reducing agent. Background technique [0002] Nickel has been widely used in various fields such as stainless steel and special alloy steel due to its strong corrosion resistance and good heat resistance. With the development of my country's stainless steel industry, the demand for nickel is also increasing. At present, 60% of nickel metal in the world is extracted from nickel sulfide ore, and its production technology is mature. Development and utilization have very important practical significance. [0003] Xu Wei and others who applied for the first application (patent application number: 201110051778.1) researched and invented a method for directly reducing laterite nickel ore nickel-iron alloy grains in a rotary kiln. The production st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/06C22B1/24C22B1/216C22B23/02
Inventor 章钦成魏永刚周世伟
Owner 章钦成
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