Method for leaching cobalt by synergetic reduction of cobalt ores

A cobalt ore and leaching technology is applied in the field of cobalt ore co-reduction leaching, which can solve the problems of low leaching rate, high cost, and environmental hazards caused by sulfur dioxide escape, and achieve the effect of improving leaching rate and realizing recycling.

Inactive Publication Date: 2018-09-25
华刚矿业股份有限公司
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Problems solved by technology

[0006] The invention provides a method for cobalt ore synergistic reduction and leaching of cobalt to solve the technical problems of low leaching rate and high cost when leaching cobalt from cobalt ore in the prior art, and the escape of sulfur dioxide during the leaching process is harmful to the environment.

Method used

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  • Method for leaching cobalt by synergetic reduction of cobalt ores

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Effect test

Embodiment 1

[0040] The weight percentage of cobalt in the Congo (golden) cobalt ore of this embodiment is 0.69%, and the weight percentage of copper is 0.93%. 90m of sulfuric acid solution containing ferrous ion concentration of 1g / L 3 / h, cobalt ore 30t / h mixed (sulfuric acid solution and cobalt ore are continuously input at the above speed), stirred and leached for 8h at room temperature, and SO2 was introduced during the leaching process 2 Gas reaction, the pH value at the end point of the reaction is 1.74, and the end point potential is 290mv. The end point reaction solution is subjected to liquid-solid separation, and the obtained filter residue is washed twice with sulfuric acid solution. According to the above steps, cyclic leaching is performed 3 times to obtain a leaching solution containing cobalt ions.

[0041] The above-mentioned leachate containing cobalt ions can increase the cobalt ion concentration to 4.5-6g / L after cyclic leaching and use, and the crude cobalt hydroxide ...

Embodiment 2

[0044] The weight percentage of cobalt in the Congo (golden) cobalt ore of this embodiment is 0.98%, and the weight percentage of copper is 2.93%. 130m of sulfuric acid solution containing ferrous ion concentration 2.5g / L 3 / h, cobalt ore 33t / h mixed (sulfuric acid solution and cobalt ore are continuously input at the above speed), stirred and leached for 6h at room temperature, and SO4 was introduced during the leaching process 2 gas, the pH value at the end point of the leaching reaction is 1.57, and the end point potential is 307mv. The end point reaction solution is subjected to liquid-solid separation, and the obtained filter residue is washed twice with sulfuric acid solution. According to the above steps, the leaching cycle is performed twice to obtain a leach solution containing cobalt ions.

[0045] The above-mentioned leachate containing cobalt ions can increase the cobalt ion concentration to 4.5-6g / L after cyclic leaching and use, and the crude cobalt hydroxide pr...

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Abstract

The invention discloses a method for leaching cobalt by synergetic reduction of cobalt ores. The method comprises the following steps: (1) mixing an acid solution containing ferrous ions or containingferrous ions and ferric ions with cobalt ores to react to generate first reaction liquid, and adding a reducing agent to the first reaction liquid to react to obtain second reaction liquid; and (2) performing liquid-solid separation on the second reaction liquid obtained in the step (1) to obtain leaching liquid containing cobalt ions. The reducing agent includes one or more of sulfur dioxide, sodium sulfite and sodium metabisulfite. The method is characterized in that the ferrous ions and the reducing agent are subjected to synergetic leaching from the acid environment, and the ferrous ionsreact with trivalent cobalt in the cobalt ores to generate divalent cobalt which can be dissolved in the acid solution, thereby being favorable for leaching of cobalt.

Description

technical field [0001] The invention relates to the field of nonferrous metal hydrometallurgy, in particular to a method for cobalt ore synergistic reduction and leaching of cobalt. Background technique [0002] Congo (Kinshasa) is the country with the largest reserves of cobalt resources in the world, and its production capacity accounts for more than half of the world's total production. Congo (Kinshasa) cobalt resources mainly exist in the form of copper-cobalt symbiotic ore, and a few are independent cobalt ore. Congo (DRC) cobalt ore mainly exists in the form of hydrocobalt ore, and currently it is mainly processed by hydrometallurgy. The hydrometallurgical method has the characteristics of mature process, flexible product scheme and environmental friendliness, and is considered to be the most suitable process for processing copper-cobalt oxide ore. [0003] The key technology in the cobalt ore leaching process is to add a reducing agent to reduce and leaching the cob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/08
CPCC22B3/08C22B23/043Y02P10/20
Inventor 张吉贵黄蕴成李宋江付晨晓高权林荣跃
Owner 华刚矿业股份有限公司
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