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Preparation method of high-purity lithium carbonate

A technology of high-purity lithium carbonate and lithium carbonate, which is applied in the direction of lithium carbonate;/acid carbonate, etc., can solve problems such as inaccessibility

Active Publication Date: 2011-04-20
天齐锂业(江苏)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, this method cannot directly obtain 99.99% lithium carbonate

Method used

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  • Preparation method of high-purity lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 adopts the inventive method to prepare high-purity lithium carbonate

[0048] The method includes the following steps (see figure 1 ): Add about 600kg of battery-grade lithium hydroxide monohydrate into the reactor and dissolve in distilled water to prepare Li 2 O concentration is the lithium hydroxide solution of 80g / L, stirring and reacting for a period of time, according to the Ca in the lithium hydroxide solution 2+ , Mg 2+ Concentration, adding an excess of 3% EDTA, the Ca in the complex solution 2+ , Mg 2+ , to obtain lithium hydroxide purification solution, and then remove insoluble impurities by pressure filtration to obtain lithium hydroxide filtrate; make Ca in the product 2+ The concentration is lower than 3ppm, making Mg in the product 2+ The concentration is less than 1ppm.

[0049] Add the lithium hydroxide filtrate to the reaction vessel first, then feed CO into the lithium hydroxide filtrate 2 gas, at the start of ventilation, CO 2 T...

Embodiment 2-8

[0051] Embodiment 2-8 adopts the inventive method to prepare high-purity lithium carbonate

[0052] Embodiment 2-8 method is the same as embodiment 1, only difference is CO 2 The specific results are shown in Table 1.

[0053]

[0054] As can be seen from Table 2, the present invention is passing through CO 2 , by controlling the CO 2 The flow rate can realize high-purity lithium carbonate with a lithium carbonate content of 99.99% in one step without further purification.

[0055] The inventor of the present invention is by adjusting lithium hydroxide solution concentration, in Li 2 Within the range of O concentration of 50-90g / L, high-purity lithium carbonate with lithium carbonate content of 99.99% can be obtained. And lithium hydroxide solution concentration is too low, when 45g / L, because the mother liquor amount increases, lithium yield reduces, and equipment utilization rate reduces. And when higher than 90g / L, because lithium hydroxide can not dissolve complete...

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Abstract

The invention relates to a preparation method of high-purity lithium carbonate, which belongs to the technical field of preparation of high-purity lithium carbonate. The invention aims at providing the method for directly preparing 99.99% lithium hydroxide by adopting lithium hydroxide, which is simple in production process. The technical scheme of the invention is as follows: preparing battery level lithium hydroxide monohydrate into solution of Li2O with concentration of 50-90g / L; introducing CO2 gas at the flow rate of 3-5L / s into the lithium hydroxide solution, wherein the flow rate of CO2 is decreased to 2-3L / s when the concentration of Li2O in the solution is decreased to 40g / L; decreasing the flow rate of CO2 to 0.8-1.2L / s when the concentration of Li2O in the solution is decreased to 20g / L; stop introducing the gas when a large number of liquids appear in the solution, and preparing lithium carbonate slurry; and separating the lithium carbonate slurry, washing the solids, drying until moisture is less than 0.1%, finally preparing the lithium carbonate. The battery level lithium hydroxide monohydrate is adopted as raw material, the high-purity lithium carbonate with the purity of 99.99% can be simply and conveniently prepared by adopting the method, and further purification is not required.

Description

technical field [0001] The invention relates to a preparation method of high-purity lithium carbonate, belonging to the technical field of preparation of high-purity lithium carbonate. technical background [0002] Li 2 CO 3 It is widely used in ceramics, glass, atomic energy, aerospace and lithium batteries, lithium alloys, medicine and other fields, and is also a raw material for the preparation of various lithium compounds. However, due to different uses, there are also different requirements for the purity and particle size of lithium carbonate. 99.9% high-purity lithium carbonate is used as positive electrode material for lithium-ion batteries; 99.99% high-purity lithium carbonate is used as electrolyte for lithium-ion batteries; 99.999% high-purity lithium carbonate is used for medicine and surface elastic wave component materials. With the continuous expansion of the application range of lithium products in high-tech fields, the demand for lithium salts at home and...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 姚开林金鹏霍立明涂明江梁平武严新星江虎成
Owner 天齐锂业(江苏)有限公司
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