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Process for removing impurities from copper-cobalt ore leaching solution by two-stage extraction

A technology of leaching liquid and extraction method, which is applied in the field of extraction and impurity removal, and can solve the problems of polluting the environment, increasing the consumption of hydrochloric acid, and increasing the cost of Cl treatment

Active Publication Date: 2019-12-10
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the leaching solution system is mostly sulfuric acid system, it will lead to calcium enrichment in the P204 impurity removal section, resulting in a large amount of calcium sulfate crystals, which will block the pipeline and pollute the environment; at the same time, due to the high saponification rate of P204, a large amount of cobalt will be extracted into the organic, thus increasing The acid consumption in the washing section increases the volume of the water phase in the washing section; the prior art generally uses hydrochloric acid washing in the miscellaneous extraction section, which will increase the consumption of hydrochloric acid and increase the amount of Cl - Emissions, increasing Cl - processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of process that adopts two-stage extraction to remove impurities from copper-cobalt ore leaching liquid, it comprises following specific steps:

[0023] The first stage: using P204 to pre-extract and remove calcium from copper cobalt sulfuric acid leaching solution

[0024] Saponify the organic extractant P204 with ammonia water, the saponification rate is 20%; the pH of the water phase at the inlet of the extraction section is 3.0-3.5, and the Ca concentration is 0.7-1.2g / L; the volume ratio of the organic phase to the water phase is 2:1, and the organic phase The flow direction is opposite to the flow direction of the water phase, which is countercurrent extraction, and the number of extraction stages is 8; the pH of the water phase at the outlet of the extraction section is 2.0, and the Ca concentration of the raffinate is below 0.05g / L;

[0025] The extracted organic phase is washed with low-concentration sulfuric acid with a concentration of 0.3-0.4N, the vo...

Embodiment 2

[0030] A kind of process that adopts two-stage extraction to remove impurities from copper-cobalt ore leaching liquid, it comprises following specific steps:

[0031] The first stage: using P204 to pre-extract and remove calcium from copper cobalt sulfuric acid leaching solution

[0032] The organic extractant P204 is saponified with ammonia water, and the saponification rate is 15%; the pH of the water phase at the inlet of the extraction section is 4.0, and the Ca concentration is 0.7-1.2g / L; the volume ratio of the organic phase to the water phase is 1.5:1, and the organic phase flows in the same direction as The flow direction of the water phase is opposite, which is countercurrent extraction, and the number of extraction stages is 10; the pH of the water phase at the outlet of the extraction section is 2.5, and the Ca concentration of the raffinate is below 0.05g / L;

[0033] The extracted organic phase is washed with low-concentration sulfuric acid with a concentration of...

Embodiment 3

[0038] A kind of process that adopts two-stage extraction to remove impurities from copper-cobalt ore leaching liquid, it comprises following specific steps:

[0039] The first stage: using P204 to pre-extract and remove calcium from copper cobalt sulfuric acid leaching solution

[0040] Saponify the organic extractant P204 with ammonia water, the saponification rate is 18%; the pH of the water phase at the inlet of the extraction section is 5.5, and the Ca concentration is 0.7-1.2g / L; the volume ratio of the organic phase to the water phase is 1:1, and the flow direction of the organic phase is in line with The flow direction of the water phase is opposite, which is countercurrent extraction, and the number of extraction stages is 9; the pH of the water phase at the outlet of the extraction section is 2.5, and the Ca concentration of the raffinate is below 0.05g / L;

[0041]The extracted organic phase is washed with low-concentration sulfuric acid with a concentration of 0.3-0...

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PUM

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Abstract

The invention belongs to the technical field of cobalt hydrometallurgy, in particular to a method for extracting and removing impurities from a copper-cobalt ore leaching solution. In view of the problems existing in the prior art, the present invention adopts a two-stage process of P204 pre-extracting calcium + P204 extracting impurities such as Ca, Cu and Zn. P204 is saponified with ammonia water first, and the saponification rate is low; by controlling the pH of the aqueous phase, the volume ratio of the organic phase to the aqueous phase, and the number of countercurrent extraction stages, the calcium content in the raffinate is kept below 0.05g / L. The lower limit of crystallization concentration does not produce calcium sulfate crystals. Due to the low saponification rate of P204, the washing section can be washed with low-concentration sulfuric acid, without calcium sulfate crystals, and most of the Co in the organic is washed into the water phase; at the same time, the washing section uses low-concentration sulfuric acid instead of hydrochloric acid for washing, reducing the consumption of hydrochloric acid. Reduce Cl ‑ Emissions, reduced Cl ‑ Processing costs. The stripping section can be stripped with low-concentration hydrochloric acid, and the concentration of Co in the liquid after stripping is low.

Description

technical field [0001] The invention belongs to the technical field of cobalt hydrometallurgy, in particular to a method for extracting and removing impurities from a copper-cobalt ore leaching solution. Background technique [0002] The wet smelting of copper-cobalt concentrate generally leaches valuable metals such as Co and Cu in the mineral into the solution under the sulfuric acid system, and the solution is purified in the later stage to remove Fe, Ca, Cu, Mn, Mg, Al, Zn, Si and other impurities to obtain a relatively pure cobalt sulfate solution; in the impurity removal process, solvent extraction is generally used to extract Fe first, and then extract Zn, Al, Ca, Cu, Mn, usually without a separate calcium extraction process. Because the leaching solution system is mostly sulfuric acid system, it will lead to calcium enrichment in the P204 impurity removal section, resulting in a large amount of calcium sulfate crystals, which will block the pipeline and pollute the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B3/08
CPCC22B3/08C22B3/3846Y02P10/20
Inventor 凌怊章青夏仙满余攀张伟
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드