Method and device for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate

A lithium carbonate, ultra-purity technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of complicated steps, low efficiency, low lithium utilization rate, etc., to reduce production costs, high purity of finished products, High utilization effect

Active Publication Date: 2017-08-18
深圳市聚能永拓科技开发有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technical solution of this patent can obtain high-purity lithium carbonate, but cannot obtain ultra-purity lithium carbonate, and the processing steps are complicated and unfriendly to the environment
[0005] Russian patent RU2564806 also

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  • Method and device for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate
  • Method and device for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate

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Embodiment Construction

[0032] The present invention is further described below in conjunction with accompanying drawing:

[0033] Ultra-purity lithium carbonate is extracted from industrial-grade lithium carbonate. Ultra-purity lithium carbonate means that the content of lithium carbonate exceeds 99.99%. Industrial grade lithium carbonate is mixed with different impurities according to different origins. This patent processes industrial grade lithium carbonate mainly containing calcium, magnesium, potassium, sodium, boron and sulfate. Lithium carbonate is slightly soluble in water, and lithium bicarbonate is highly soluble in water. Lithium carbonate is carbonized to generate lithium bicarbonate, and then calcium and magnesium ions are removed by ion exchange, and lithium bicarbonate is decarburized by heating. Sodium dissolves in water, so the precipitated lithium carbonate after decarburization will be extremely pure.

[0034] In the traditional process, similar processes for preparing ultra-pur...

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Abstract

The invention relates to a method for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate. The method comprises the following steps: A, preparing a lithium hydrogen carbonate solution; B, performing ion exchange impurity removal; C, performing impurity removal on an ion exchange resin regeneration solution; D, performing lithium hydrogen carbonate heating decarbonization: heating the lithium hydrogen carbonate solution subjected to ion exchange impurity removal, so as to convert lithium hydrogen carbonate into lithium carbonate precipitates, and filtering the solution to obtain the lithium carbonate precipitates and a separate solution; E, concentrating the separate solution in Step D to obtain the lithium carbonate precipitates and a separate solution; F, adding an impurity removal reagent into the separate solution in Step E to remove sulfate radical and borate ions, filtering to obtain precipitates and a separate solution, and returning the separate solution as a pulping raw material. The method comprises few34 procedures, and is pollution-free, and a lithium utilization rate is high.

Description

technical field [0001] The invention relates to a method and a device for extracting ultra-purity lithium carbonate from industrial grade lithium carbonate. Background technique [0002] With the application of electronic products and the promotion of electric vehicles, the demand for lithium carbonate as a raw material for lithium batteries is increasing day by day. [0003] Russian patent document RU2243157 provides a method for extracting extra-purity lithium carbonate from industrial-grade lithium carbonate, which includes mechanically activating and crushing industrial-grade lithium carbonate, and using carbon dioxide at 5-25°C and 0.5 atmospheric pressure to decompose the carbonic acid after mechanical activation. The lithium slurry is carbonized and stirred until a lithium bicarbonate solution is obtained, the lithium bicarbonate solution is filtered, the impurity is removed using a synthetic cation exchange resin whose composition is vinylpyridine or sulfonic acid or...

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 盛亮
Owner 深圳市聚能永拓科技开发有限公司
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