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Process method of micro-powder battery grade lithium hydroxide monohydrate

A technology of lithium hydroxide monohydrate and process methods, applied in chemical instruments and methods, lithium oxides;/hydroxides, inorganic chemistry, etc., can solve the problems of high product impurities, easy fluctuations in quality, and high preparation costs, and achieve The effect of stable product quality, improved product quality and simple preparation process

Pending Publication Date: 2022-05-27
江西九岭锂业股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN111170342 A, disclose the method for preparing battery grade lithium hydroxide with industrial grade lithium hydroxide, this method is simple, but cost is high
[0004] At present, lithium hydroxide monohydrate still has the following problems: (1) the raw materials are limited. At present, it is mainly to prepare battery-grade lithium hydroxide monohydrate with spodumene, lithium carbonate or industrial grade lithium hydroxide as raw materials. The technology for preparing lithium hydroxide monohydrate from lepidolite; (2) The preparation method of freezing after causticizing is the mainstream, but this method has high energy consumption, high product impurities, and easy fluctuation in quality; (3) The preparation cost is high

Method used

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  • Process method of micro-powder battery grade lithium hydroxide monohydrate
  • Process method of micro-powder battery grade lithium hydroxide monohydrate
  • Process method of micro-powder battery grade lithium hydroxide monohydrate

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Embodiment 1

[0037] like figure 1 A process method for micropowder battery grade lithium hydroxide monohydrate, comprising the following steps:

[0038] In step S1, the lepidolite and sulfate are in a ratio of 1.3-2.5:1 by mass, at a temperature of 800-1200 degrees, and calcined for 0.5-2 hours, and then cooled to room temperature to obtain calcined clinker;

[0039] Step S2, ball milling and leaching the roasted clinker and water in a ratio of 2 to 0.5:1 to obtain a slurry of lithium sulfate solution;

[0040] In step S3, the slurry of the lithium sulfate solution obtained in step S2 is subjected to liquid-solid separation to obtain a lithium sulfate solution and lithium-containing silica sand; its subsidiary product, silica sand, can be directly sold;

[0041] In step S4, the obtained lithium sulfate solution is added with calcium oxide or sodium hydroxide to adjust the pH value to 11-13, and liquid-solid separation is performed to obtain a lithium sulfate purification solution;

[004...

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Abstract

The invention discloses a process method of micro-powder battery grade lithium hydroxide monohydrate. Comprising the following treatment steps: mixing lepidolite and sulfate, roasting, adding water, ball-milling and leaching, carrying out liquid-solid separation, adding calcium oxide to adjust the pH value, carrying out liquid-solid separation, removing cations such as calcium and magnesium by using ion exchange resin, causticizing barium hydroxide, crystallizing, re-dissolving, crystallizing and drying, crushing, packaging and the like. According to the process method of the micro-powder battery-grade lithium hydroxide monohydrate, the process step of obtaining the lithium hydroxide monohydrate from the lepidolite ore is reduced, and meanwhile, other lithium salt processes such as lithium carbonate precipitation and the like are not needed in the process to convert the lithium hydroxide into lithium hydroxide; the lithium hydroxide monohydrate preparation process is simplified, the production cost is reduced, the product quality stability is improved, and the product yield is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium hydroxide monohydrate, and in particular relates to a process method for micropowder battery grade lithium hydroxide monohydrate. Background technique [0002] Basic lithium salt products such as lithium carbonate and lithium hydroxide are widely used in dyes, chemical raw materials, glass manufacturing, ceramics, food, semiconductors, defense and military, atomic energy, catalysts and other fields. Battery-grade lithium hydroxide can be used to prepare ternary materials and phosphoric acid. Lithium iron and other lithium-ion battery cathode materials; high-grade pure lithium hydroxide monohydrate is not only used in high-end lithium-ion battery cathode materials and battery-grade lithium fluoride, but also widely used in optoelectronic information, and can be used to prepare optical special glass, magnetic materials and In the supercapacitor and pharmaceutical industries, with the continuous inno...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01F11/46
CPCC01D15/02C01F11/462C01P2004/01C01P2004/61C01P2006/80Y02E60/13
Inventor 姚丽李辰钰魏冬冬廖新占道武潘龙辉王清菱袁从淦
Owner 江西九岭锂业股份有限公司
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