Method for preparing high-nickel concentrate from low-grade red soil nickel ore

A laterite nickel ore, low-grade technology, applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve the problems of non-extraction technology, achieve strong process adaptability, fine embedded particle size, and improve the effect of separation

Inactive Publication Date: 2011-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign high-grade lateritic nickel ore resources have been mostly controlled by companies such as Japan, Europe and the United States, while low-grade lateritic nickel ore (containing less than 1.4% nickel) accounting for 70% of the reserves has no effective extraction technology

Method used

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  • Method for preparing high-nickel concentrate from low-grade red soil nickel ore
  • Method for preparing high-nickel concentrate from low-grade red soil nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , low-grade silicate-type laterite nickel ore is dried to a moisture content of 15%, crushed to 100% less than 3mm, crushed and high-pressure roller milled to -0.074mm80%, mixed with 1% coal and 15% compound additives , pelleting water 25%, pelletizing time 8min, raw pellet 6-16mm. The green pellets are dried and preheated on the chain grate machine. The preheating temperature is 1000°C and the preheating time is 20 minutes. The compressive strength of the pellets is greater than 500N. The preheated pellets enter the rotary kiln for reduction, and the amount of reduced coal (5mm-30mm) added The mass ratio of reduced coal to pellets is 0.8. The reduction temperature in the first stage is 800°C, the reduction time is 30 minutes, and the amount of reduced coal accounts for 30% of the total amount; the reduction temperature in the second stage is 1100°C, the reduction time is 90 minutes, and the amount of reduced coal added accounts for 70% of the total amount...

Embodiment 2

[0022] see figure 1 , low-grade silicate-type laterite nickel ore is dried to a moisture content of 14%, crushed to 100% less than 3mm, crushed and high-pressure roller milled to -0.074mm80%, mixed with 3% coal and 15% compound additives , pelleting water 25%, pelletizing time 8min, raw pellet 6-16mm. The green pellets are dried and preheated on the chain grate machine. The preheating temperature is 1100°C and the preheating time is 15 minutes. The compressive strength of the pellets is greater than 500N. The preheated pellets enter the rotary kiln for reduction, and the amount of reduced coal (5mm-30mm) added It is reduced coal, and the mass ratio of pellets is 1.0. The reduction temperature in the first stage is 900°C, the reduction time is 30 minutes, and the amount of reduced coal accounts for 30% of the total amount; the reduction temperature in the second stage is 1200°C, the reduction time is 60 minutes, and the amount of reduced coal added accounts for 70% of the tota...

Embodiment 3

[0024] see figure 1 , low-grade silicate-type laterite nickel ore is dried to a moisture content of 15%, crushed to 100% less than 3mm, crushed and high-pressure roller milled to -0.074mm80%, mixed with 3% coal and 20% compound additives , pelleting water 25%, pelletizing time 8min, raw pellet 6-16mm. The green pellets are dried and preheated on the chain grate machine. The preheating temperature is 1050°C and the preheating time is 18 minutes. The compressive strength of the pellets is greater than 500N. The preheated pellets enter the rotary kiln for reduction, and the amount of reduced coal (5mm-30mm) added It is reduced coal, and the mass ratio of pellets is 1.0. The reduction temperature of the first stage is 1050°C, the reduction time is 20 minutes, and the amount of reduced coal accounts for 30% of the total amount. The reduction temperature of the second stage is 1250°C, and the reduction time is 80 minutes. The amount of reduced coal added accounts for 70% of the tot...

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Abstract

The invention discloses a method for preparing a high-nickel concentrate from a low-grade red soil nickel ore, which comprises the following steps of: drying the low-grade red soil nickel ore until water content is 13 to 16 percent, crushing to ensure that the size of all particles is less than 3mm, grinding by using a high-pressure roller mill to ensure that particles with the size of less than 0.074mm account for 80 percent and specific surface area is not less than 2,000cm<2>/g, adding 15 to 20 percent of composite binder and 1 to 5 percent of coal powder, and pelletizing by using a disc pelletizer to obtain green pellets with the size of 6 to 16mm; drying and preheating the green pellets on a chain grate for water removal and solidification to ensure that each piece of pellet entering a kiln has the compression strength of over 500N; directly adding the preheated and solidified pellets into a rotary kiln, and reducing at the temperature of between 1,100 and 1,250 DEG C for 60 to 120 minutes by using pea coal as a reducing agent in a mass ratio of the reducing coal to the pellets of 0.8-1.0; and cooling a reduction product, sieving, performing magnetic separation to obtain a magnetic product, crushing, grinding, and performing magnetic separation to obtain the high-nickel concentrate, wherein the composite additive comprises the following components: Na2CO3 and CaO, iron oxide powder, the coal powder and sodium humate in a ratio of (30-60):(20-30):(20-30):(5-10). The method is high in adaptability and nickel recovery rate and suitable for mass production.

Description

technical field [0001] The invention relates to a method for preparing high-nickel concentrate ore from laterite nickel ore, in particular to a method for preparing high-nickel concentrate ore from low-grade laterite nickel ore. Background technique [0002] At present, about 60% of the world's nickel is extracted from sulfide ore, and the resource is decreasing sharply, and the mining depth is increasing day by day, and the extraction cost is rising. The lateritic nickel ore, which accounts for 72% of the total reserves, has a low mining cost and can directly produce products such as nickel oxide, nickel matte, and ferronickel. Especially, ferronickel is used to manufacture stainless steel. The production process is short and the cost is low, which has attracted great attention from all over the world. and attention. It has been proven that the nickel metal reserves of laterite nickel ore in the world are 160 million tons, but our country only has 800,000 tons, which is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/02B03C1/02C22B23/00
Inventor 朱德庆潘建李启厚郑国林李紫云
Owner CENT SOUTH UNIV
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