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Process for extracting nickel and cobalt from laterite by ore pulp extraction technology

An extraction technology and a technology of laterite ore, applied in the field of non-ferrous metal hydrometallurgy, can solve the problems of heavy filtration burden, unrecoverable nickel and cobalt, high viscosity of precipitate and difficult to wash, etc., achieve low comprehensive consumption, reduce the burden of liquid-solid separation, and recover high rate effect

Active Publication Date: 2011-04-13
JILIN JIEN NICKEL IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By neutralizing and removing iron, the resulting precipitate has a high viscosity and is difficult to wash, and the filtration burden is huge
Despite the multi-stage washing method, there is still a large amount of nickel and cobalt mixed into the iron slag and cannot be recovered

Method used

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  • Process for extracting nickel and cobalt from laterite by ore pulp extraction technology
  • Process for extracting nickel and cobalt from laterite by ore pulp extraction technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Take 1000g of laterite ore and crush it, add 2000ml of water to the laterite ore, and grind until the particle size is less than 0.074mm;

[0027] b. Put the ground pulp into the autoclave, add 1500ml of 5% sulfuric acid at a ratio of 2 / 1 to the pulp for high-pressure acid leaching;

[0028] c Inject the leached pulp into the normal pressure reactor, add CaCO 3 Adjust the pH value of the solution to 1.55; at the same time, pass hot air into the blast to oxidize, stir and react for 2 hours, and the temperature is 90°C, so that iron is oxidized to ferric ion hydrolysis and precipitation, and the iron content in the solution after iron removal is less than 5mg / l;

[0029]d. The ore pulp after iron removal is poured into the mixed sedimentation extraction tank with stirring, settling tank and baffle, and is extracted by P204 extraction agent in 5 stages, the extraction temperature is 20°C, washed with 1% sulfuric acid solution, and then washed with 3N hydrochloric acid s...

Embodiment 2

[0033] a. Take 1000g of laterite ore and crush it, add 3000ml of water to the laterite ore, and grind until the particle size is less than 0.074mm;

[0034] b. Put the ground pulp into the autoclave, and add 1000ml of sulfuric acid with a concentration of 10% in the ratio of 3 / 1 of the pulp to carry out high-pressure acid leaching;

[0035] c. Inject the leached ore pulp into the normal pressure reaction kettle, add CaO to adjust the pH of the solution to 2.0; at the same time, pass hot air into it for oxidation, stir for 3 hours, and the temperature is 90°C to oxidize iron into ferric ions, hydrolyze and precipitate, and remove iron The iron content in the final solution is less than 5mg / l;

[0036] d. The ore pulp after iron removal is poured into the mixed sedimentation extraction tank with stirring, settling tank and baffle, and is extracted by P204 extractant at 8 stages, the extraction temperature is 30°C, washed with 2% sulfuric acid solution, and then washed with 4N hy...

Embodiment 3

[0040] a. Take 1000g of laterite ore and crush it, add 4000ml of laterite ore water, and grind until the particle size is less than 0.074mm;

[0041] b. Put the ground pulp into the autoclave, add 1000ml of 13% sulfuric acid at a ratio of 4 / 1 to the pulp for high-pressure acid leaching;

[0042] c Inject the leached ore slurry into the normal pressure reactor, add Na 2 CO 3 Adjust the pH of the solution to 4; at the same time, pass hot air into it to oxidize, stir and react for 2-5 hours, and the temperature is 90°C, so that iron is oxidized to trivalent iron ion hydrolysis and precipitation, and the iron content in the solution after iron removal is less than 5mg / l;

[0043] d. The ore pulp after iron removal is injected into the mixed sedimentation extraction tank with stirring, settling tank and baffle, and is extracted with P204 extractant at 10 levels, the extraction temperature is 40 ° C, washed with 4% sulfuric acid solution, and then washed with 5N hydrochloric acid s...

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Abstract

The invention relates to a process for extracting nickel and cobalt from laterite by ore pulp extraction technology, which comprises the following steps of: crushing and grinding the laterite; putting into a high-pressure kettle, and carrying out high-pressure acid leaching to remove iron; pouring into a mixing settling extraction tank with a stirring and settling tank and a baffle plate, carrying out 5-12 grade of extraction, back extraction and phase splitting and washing to respectively obtain mixed solution of nickel and cobalt, waste liquid containing impurities and the ore pulp; extracting and separating nickel from cobalt to respectively obtain pure nickel solution and pure cobalt solution; and precipitating and calcining to obtain nickel oxide and cobalt oxide products. The solution with high concentration is obtained by extraction, the process is shortened, the liquid-solid separation load and a number of washing and filtering processes are reduced, so that energy consumption of production and production cost are reduced and the economic benefit is improved. An extracting agent can be used repeatedly after being saponified and has relatively low comprehensive consumption. The speed of the extraction process is high and is commonly less than 10 minutes. The extraction efficiency is high. The extracted ore pulp can be neutralized uniformly so as to reduce the treatment cost of tailings. The process is simple; the recovery rate is higher; and the nickel and cobalt recovery rates are both more than or equal to 90 percent and the process is easy to popularize.

Description

Technical field: [0001] The invention relates to a non-ferrous metal hydrometallurgy technology, which is to extract and recover nickel and cobalt from ore pulp by adopting a pulp extraction technology after wet high-pressure leaching of laterite ore. Background technique: [0002] About 30% of the global terrestrial nickel resources occur in sulfide ores, and 70% in laterite ores (nickel oxide ores). Currently only about 40% of global nickel production comes from laterite ores. With the acceleration of the development of laterite mine projects in the world in recent years, it is estimated that more than 50% of the global nickel production will come from laterite mines by 2012. Laterite ore has the characteristics of refractory mineral separation. Compared with nickel sulfide ore, laterite ore for smelting treatment has lower ore grade, higher smelting cost, and relatively poor development economy. [0003] The process of processing nickel oxide ore is mainly divided into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/26C22B23/00
CPCY02P10/20
Inventor 李韧王学哲刘力勇袁凤艳刘丹丹曲海翠马忠诚张鸣昕项允丛
Owner JILIN JIEN NICKEL IND
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