Composite additive for producing nickel-iron particles by using laterite, and application method thereof

A composite additive and laterite nickel ore technology, which is applied in the field of composite additives for the production of nickel-iron alloys by direct reduction of laterite nickel ore, can solve the problem that the blast furnace method has poor adaptability to laterite nickel ore, the hydrometallurgical process is not very mature, and the rotary kiln-electric furnace process Long process and other problems, to achieve the effect of high-quality nickel-iron products, reduced power consumption, and strong adaptability

Active Publication Date: 2012-08-22
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In summary, in the treatment of laterite nickel ore, various processes have their own characteristics. Generally speaking, the hydrometallurgical process is not very mature, and the blast furnace method has poor adaptability to laterite nickel ore. The process flow of rotary kiln-electric furnace long, high energy consumption, especially electricity consumption, so new metallurgical processes of lateritic nickel ore are being developed at home and abroad

Method used

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  • Composite additive for producing nickel-iron particles by using laterite, and application method thereof
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  • Composite additive for producing nickel-iron particles by using laterite, and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] According to the composition of the laterite nickel ore 1, the ratio of raw materials for preparing the composite additive is 50% quicklime, 32% fluorite, 15% soda ash and 3% boric acid, and the composite additive powder with a particle size of less than 0.15mm is produced by a ball mill.

[0040] The composite additive is added to the laterite nickel ore powder according to the addition amount of 8wt% of the laterite nickel ore, the amount of coal powder added is 20% of the laterite nickel ore weight, mixed evenly, and after adding a little water, pressed into the laterite nickel ore carbon-containing ball The carbon-containing pellets of the laterite nickel ore were reduced for 8 hours at a temperature of 1200° C. (that is, kept at a constant temperature for 8 hours). After cooling, nickel-iron particles containing about 6 wt % of nickel were obtained by magnetic separation.

Embodiment 2

[0042] Change the addition of the composite additive to 5% of the laterite nickel ore weight, and other ingredients are the same as in Example 1, and the reduction temperature is increased to 1250°C. After 8 hours of reduction, the reduction of the laterite ore and the separation of slag and gold can be realized. Select the same nickel-iron particles containing about 6wt% nickel.

Embodiment 3

[0044] According to the composition of laterite nickel ore 2, the ratio of raw materials for the preparation of composite additives is 10% of quicklime, 70% of fluorite, 5% of soda ash, 10% of boric acid and 5% of cryolite, and the composite additive powder of less than 0.15mm is made by ball mill .

[0045]The composite additive is added to the laterite nickel ore powder according to the addition amount of 18wt% of laterite nickel ore, and the amount of coal powder added is 15% of the weight of laterite nickel ore, mixed evenly, and after adding a little water, pressed into laterite nickel ore carbon-containing balls Reduction at 1250°C for 7 hours can realize the reduction of laterite ore and the separation of slag and gold. After cooling, ferronickel particles containing about 12% nickel can be obtained by magnetic separation.

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Abstract

The invention discloses a composite additive for producing nickel-iron particles by using laterite, which comprises the components by mass percent: 20-70% of fluorite, 10-50% of quick lime, 5-20% of sodium carbonate, 3-10% of boric acid and 0-10% of cryolite; and correspondingly, the invention also provides an application method of the composite additive, which comprises the steps of: mixing laterite powder, the composite additive and pulverized coal, adding water into the mixture to prepare carbon-containing laterite pellets; then, carrying out reduction on the carbon-containing laterite pellets at 1200-1400 DEG C for 2-8 hours, and then carrying out slag-metal liquation; and directly carrying out magnetic separation without carrying out the levigation step after cooling, and separating nickel-iron alloy from furnace slag.

Description

technical field [0001] The invention relates to a composite additive, in particular to a composite additive used for direct reduction of laterite nickel ore to produce ferronickel alloy. Background technique [0002] At present, the world's proven nickel reserves are about 160 million tons, of which sulfide ore accounts for about 30%, and laterite nickel ore accounts for about 70%. Due to the mature extraction process of nickel sulfide ore, about 60% of nickel production comes from nickel sulfide ore. Although there are large reserves of laterite nickel ore, due to technical and economic reasons, many laterite nickel ore have not been developed on a large scale. Therefore, in the long run, laterite nickel ore will be the main source of nickel in the future. At present, the resources of nickel sulfide ore with high grade and good mining conditions are gradually becoming tense or even exhausted, and the development and utilization of laterite nickel ore is likely to be accele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/14C22B23/02
Inventor 张友平刘峰张勇陈祥明马腾
Owner BAOSHAN IRON & STEEL CO LTD
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