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Method for extracting nickel-cobalt from laterite nickel ore by utilizing hydrochloric acid leaching

A technology for leaching laterite nickel ore and hydrochloric acid, applied in the field of non-ferrous metal metallurgy, can solve the problems of difficult separation of iron and nickel and cobalt, large amount of nickel entrainment, large amount of iron slag, etc. effect of concentration

Inactive Publication Date: 2019-03-12
INST OF PROCESS ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching conditions of the hydrochloric acid system are mild, the equipment investment is small, the technical risk is small, and the ore types are more universal, which has good advantages. However, the hydrochloric acid leaching process has not yet achieved large-scale industrial application. The main problem lies in the conventional hydrochloric acid leaching process. The iron content in the medium reaches 100-120g / L. The high iron concentration makes it difficult to separate iron from nickel and cobalt. At the same time, the amount of iron slag is large, and the amount of nickel entrained in the slag is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to the ratio of 3:1, the limonite-type laterite-nickel ore and serpentine-type laterite-nickel ore are mixed evenly and then ground, and the particle size after grinding is controlled at 200 meshes, accounting for 85% of the total ore amount; according to hydrochloric acid: mixed ore Add hydrochloric acid at a mass ratio of 3:1, heat to 95°C, and keep warm for 3h. After the separation of the reaction slurry, the total iron concentration in the leaching solution was 93g / L, the Ni concentration reached 6.5g / L, and the Co concentration was 0.4g / L; Iron slag. The separated mother liquor and iron slag washing liquid are combined to obtain a nickel-cobalt-rich leaching solution, the recovery rate of nickel is 95.5%, and the magnesium silicate building material is prepared after the silicon slag is washed.

Embodiment 2

[0034] According to the ratio of 1:1, the limonite-type laterite-nickel ore and the serpentine-type laterite-nickel ore are mixed evenly and then ground, and the particle size after grinding is controlled at 200 meshes, which accounts for 90% of the total ore amount; according to hydrochloric acid: mixed ore Add hydrochloric acid at a mass ratio of 2:1, heat to 110°C, and keep warm for 2h. After the separation of the reaction slurry, the total iron concentration in the leaching solution is 54g / L, the Ni concentration reaches 5.7g / L, and the Co concentration is 0.3g / L; under normal temperature conditions, the leaching solution is neutralized by adding sodium hydroxide and then oxidized by adding sodium hypochlorite to obtain iron removal scum. The separated mother liquor and iron slag washing solution are combined to obtain a nickel-cobalt-rich leaching solution, the recovery rate of nickel is 96.3%, and the magnesium silicate building material is prepared after the silicon sla...

Embodiment 3

[0036] According to the ratio of 1:8, limonite-type laterite-nickel ore and serpentine-type laterite-nickel ore are mixed evenly and then ground. After grinding, the particle size is controlled at 200 meshes, and the amount of ore accounts for 78% of the total ore amount; according to hydrochloric acid: mixed ore Add hydrochloric acid at a mass ratio of 1:1, heat to 130°C, and keep warm for 1h. After the separation of the reaction slurry, the total iron concentration in the leaching solution was 25g / L, the Ni concentration reached 5.2g / L, and the Co concentration was 0.2g / L; Iron slag. The separated mother liquor and iron slag washing solution are combined to obtain a nickel-cobalt-rich leaching solution, the recovery rate of nickel is 95.6%, and the calcium silicate building material is prepared after the silicon slag is washed.

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Abstract

The invention provides a method for extracting nickel-cobalt from laterite nickel ore by utilizing hydrochloric acid leaching. The method comprises the following steps of: uniformly mixing brown irontype laterite nickel ore with serpentine type laterite nickel ore and afterwards grinding; adding the ground mixed ores into hydrochloric acid to carry out leaching reaction; carrying out solid and liquid separation on the obtained reaction slurry to obtain silicon slag and leaching liquid; and oxidizing, neutralizing and filtering the obtained leaching liquid to obtain leaching liquid rich in nickel and cobalt. The method provided by the invention implements hydrochloric acid leaching by taking the mixed ores of the brown iron type laterite nickel ore and the serpentine type laterite nickel ore as raw materials, thereby effectively increasing the nickel content and reducing the iron content in the leaching liquid.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for extracting nickel and cobalt by leaching laterite nickel ore with hydrochloric acid. Background technique [0002] Nickel has excellent properties such as corrosion resistance, high temperature resistance, and oxidation resistance, and is widely used in aerospace, machinery manufacturing, electrical instruments, chemical metallurgy and other industrial sectors. The mineral resources of nickel mainly include nickel sulfide ore and nickel oxide ore, and the nickel in the nickel oxide deposit accounts for 65-70% of the total nickel reserves. With the reduction of high-grade and easy-to-mining nickel sulfide ore resources, the cost of extracting metallic nickel and cobalt from nickel sulfide ore has increased year by year; since 2012, nickel metal extracted from laterite nickel ore accounts for 45% of the world's nickel production Above, therefore, u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10C22B3/44C22B23/00
CPCC22B3/10C22B3/44C22B23/0423Y02P10/20
Inventor 曲景奎魏广叶郭强张忠虎齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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