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Method for removing calcium and magnesium impurities in lithium-rich solution by extraction process

An extraction method, lithium-rich technology, applied in the direction of lithium carbonate;/acid carbonate, etc., to achieve the effect of short time consumption, simple decalcification operation, and few steps

Inactive Publication Date: 2016-06-29
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the use of solvent extraction to remove calcium and magnesium ion impurities.

Method used

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  • Method for removing calcium and magnesium impurities in lithium-rich solution by extraction process

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Effect test

example 1

[0043] The lithium-rich solution was used as the extraction solution, the pH value of the extraction solution was adjusted to 3 with calcium carbonate and the temperature was controlled at 10°C. The extractant P204 and sulfonated kerosene as a slow-release agent were used to form the extract, wherein P204 and sulfonated kerosene were mixed in a volume ratio of 1:3. After oscillating and mixing the extracting solution and the extracting solution, control the extraction equilibrium time to 10 minutes, and the number of extraction stages to 6, so that the calcium and magnesium ions in the aqueous phase enter the organic phase, and the first raffinate and the loaded organic phase are separated.

[0044] The obtained loaded organic phase was washed and purified with 2 mol / L hydrochloric acid, the number of washing stages was 4, and the purified organic phase and washing liquid were separated to obtain.

[0045] The obtained purified organic phase is back-extracted with 4.5mol / L hyd...

example 2

[0054] The lithium-rich solution was used as the extraction solution, the pH value of the extraction solution was adjusted to 4 with calcium carbonate and the temperature was controlled at 30°C. The extractant P507 and sulfonated kerosene as a slow-release agent were used to form the extract, and P204 and sulfonated kerosene were mixed in a volume ratio of 1:2. After oscillating and mixing the extracting solution and the extracting solution, control the extraction equilibrium time to 15 minutes, and the number of extraction stages to 5, so that the calcium and magnesium ions in the aqueous phase enter the organic phase, and separate to obtain the first raffinate and the loaded organic phase.

[0055] The obtained loaded organic phase was washed and purified with 3 mol / L hydrochloric acid, the number of washing stages was 5, and the purified organic phase and the washing liquid were separated to obtain the purified organic phase.

[0056] The obtained purified organic phase is ...

example 3

[0065] The lithium-rich solution was used as the extraction solution, the pH value of the extraction solution was adjusted to 5 with calcium carbonate and the temperature was controlled at 50°C. The extractant P350 and sulfonated kerosene as a slow-release agent were used to form the extract, and P204 and sulfonated kerosene were mixed in a volume ratio of 1:1. After oscillating and mixing the extracting solution and the extracting solution, the extraction equilibrium time is controlled to be 30 minutes, and the number of extraction stages is 7, so that the calcium and magnesium ions in the aqueous phase enter the organic phase, and the first raffinate and the loaded organic phase are separated.

[0066] The obtained loaded organic phase was washed and purified with 0.5 mol / L hydrochloric acid, the number of washing stages was 6, and the purified organic phase and washing liquid were obtained by separation.

[0067] The obtained purified organic phase is back-extracted with 3 ...

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Abstract

The invention discloses a method for removing calcium and magnesium impurities in a lithium-rich solution by means of an extraction method. The method comprises the following steps: A. The lithium-rich solution is used as an extraction stock solution and mixed with an extraction solution composed of an extraction agent and a slow-release agent And carry out extraction, separate to obtain the first raffinate and organic phase, wherein, the extractant is P204, and the slow-release agent is sulfonated kerosene; B, use detergent to wash the organic phase, separate to obtain the washed liquid and the loaded organic phase; C, using a stripping agent to carry out back extraction on the loaded organic phase, and separate to obtain a purified organic phase and a second raffinate. The present invention is simple in operation, less in steps and shorter in time, without a large amount of solid precipitation, environmentally friendly, lower in cost, more thorough in calcium removal, can reduce the calcium in the solution to below 0.01g / L, and reduce the lithium carbonate product Calcium in the water drops below 0.005g / L.

Description

technical field [0001] The invention relates to the technical field of lithium carbonate preparation, more specifically, relates to a method for removing calcium and magnesium impurities in a lithium-rich solution by an extraction method. Background technique [0002] Lithium carbonate is a colorless crystal or white powder with a specific gravity of 2.11 and a melting point of 618°C. Its solubility in cold water is higher than that in hot water. Spodumene is usually used as raw material. The main process for producing lithium carbonate is the sulfuric acid method. Lithium carbonate is a basic lithium salt. It is mainly used in the battery industry to manufacture lithium cobaltate, lithium nickelate, lithium manganate and other electrode materials. It is also used as a non-aqueous electrolyte in rechargeable lithium batteries. It has good electrochemical properties and has been used As an important additive for TV picture tube glass, heat-resistant glass, porous glass and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 曹乃珍涂明江杨柳徐川高洁廖仕英
Owner TIANQI LITHIUM CORP
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