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Method for preparing battery-grade lithium carbonate or high-purity lithium carbonate from industrial-grade lithium carbonate

A high-purity lithium carbonate, lithium carbonate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of high impurity content, difficulty in further improving product purity, etc., achieving simple and easy process and increasing technology Content and added value, low cost effect

Inactive Publication Date: 2014-01-29
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still deficiencies in the current preparation method, and the most significant problem is that it is difficult to further improve the product purity, and the impurity content is relatively high

Method used

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  • Method for preparing battery-grade lithium carbonate or high-purity lithium carbonate from industrial-grade lithium carbonate
  • Method for preparing battery-grade lithium carbonate or high-purity lithium carbonate from industrial-grade lithium carbonate
  • Method for preparing battery-grade lithium carbonate or high-purity lithium carbonate from industrial-grade lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A certain industrial grade lithium carbonate, its composition is Li 2 CO 3 98.29%, Ca0.027%, Mg0.0055%, Na0.026%, K0.012%, Fe0.0015%, Cl0.009%, SO 4 2- 0.18%, hydrochloric acid insoluble matter 0.38%.

[0027] (1) At a liquid-solid ratio of 17.5, CO 2 Carry out carbonization test under the conditions of flow rate 40L / h, carbonization time 1.5h, and filter. Li + The loss rate in the solid phase was 1.52%, and the Ca in the filtrate 2+ 24mg / L, Mg 2+ 12mg / L.

[0028] (2) Pass the filtrate of (1) into the exchange column equipped with chelating resin, the flow rate is 0.8ml / min, and the removal rate of primary ion exchange calcium is 78%.

[0029] (3) Put the liquid after primary ion exchange into a three-necked flask with a stirrer, stir, heat until the material liquid boils, react for 1.5h, filter, wash, and dry to obtain lithium carbonate product.

[0030] (4) After analysis, the content of lithium carbonate in the product is 99.9%, reaching the quality standard...

Embodiment 2

[0033] A certain industrial grade lithium carbonate, its composition is Li 2 CO 3 98.29%, Ca0.027%, Mg0.0055%, Na0.026%, K0.012%, Fe0.0015%, Cl0.009%, SO 4 2- 0.18%, hydrochloric acid insoluble matter 0.38%.

[0034] (1) At a liquid-solid ratio of 20, CO 2 Carry out carbonization test under the conditions of flow rate 45L / h, carbonization time 1h, and filter. Li + The loss rate in the solid phase was 1.09%, and the Ca in the filtrate 2+ 5.3mg / L, Mg 2+ 2.4mg / L.

[0035] (2) Pass the filtrate of (1) into the exchange column equipped with chelating resin, the flow rate is 1ml / min, the removal rate of calcium in the primary ion exchange is 80%, and the removal rate of calcium in the secondary ion exchange is 99%.

[0036] (3) Put the ion-exchanged solution into a three-necked flask with a stirrer, stir, heat until the material solution boils, react for 1 hour, filter, wash, and dry to obtain lithium carbonate product.

[0037] (4) After analysis, the content of lithium ca...

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Abstract

The invention discloses a method for preparing battery-grade lithium carbonate or high-purity lithium carbonate from industrial-grade lithium carbonate. The method comprises the following steps of: (1) carbonization: mixing the industrial-grade lithium carbonate with secondary distilled water to obtain slurry and then introducing carbon dioxide gas so that lithium carbonate solid is dissolved into a lithium bicarbonate solution; (2) ion exchange: removing main impurities such as calcium and magnesium out of the solution by using resin through carrying out ion exchange once or twice; and (3) pyrolysis: heating the solution subjected to ion exchange adsorption once for a certain time under the boiling condition, filtering, washing and drying to obtain the battery-grade lithium carbonate; and heating the solution subjected to ion exchange adsorption twice or more times for pyrolysis, filtering, washing and drying to obtain the high-purity lithium carbonate. The method provided by the invention is capable of effectively controlling the content of impurities, is short in process flow, low in energy consumption and friendly to environment, and also has high practical value.

Description

technical field [0001] The invention relates to a method for preparing battery-grade lithium carbonate or high-purity lithium carbonate by using industrial-grade lithium carbonate, which belongs to the field of separation and purification of inorganic material preparation. Background technique [0002] As a key product for the production of lithium metal and secondary lithium salt, industrial-grade lithium carbonate is an indispensable raw material in important industrial fields such as glass ceramics, petrochemicals, medicine, and batteries. In recent years, with the warming up of low-carbon economy and new energy industry, especially the rapid development of lithium battery industry, Li 2 CO 3 The demand for lithium is increasing day by day, and the scope of application is constantly expanding, but its purity requirements are also getting higher and higher, so the purification and preparation of high-purity Li 2 CO 3 It is imperative. [0003] Industrial grade lithium ...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 谭秀民张利珍张秀峰李琦赵恒勤
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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