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Lithium hydroxide monohydrate and preparation method thereof

A technology of monohydrate lithium hydroxide and sodium ferrocyanide, applied in chemical instruments and methods, lithium oxide;/hydroxide, mixing methods, etc., can solve problems such as dust flying, and achieve low equipment investment and product quality. The effect of stable quality and low product cost

Active Publication Date: 2012-04-25
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] The technical problem to be solved by the present invention is aimed at existing wet LiOH·H 2 O has a compaction problem, and dry LiOH·H 2 O has the problem of flying dust, providing a new LiOH·H 2 O, that is, dust-free, non-hardened lithium hydroxide monohydrate

Method used

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  • Lithium hydroxide monohydrate and preparation method thereof
  • Lithium hydroxide monohydrate and preparation method thereof
  • Lithium hydroxide monohydrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Battery-grade dust-free LiOH·H 2 Preparation of O

[0047] (1) Preparation of Li 2 LiOH solution with an O concentration of 70±5g / l

[0048] Take Li 2 Li with an O concentration of 38 g / L 2 SO 4 Leach solution 10000ml, add Ca(OH) to it 2 Adjust pH=7, filter, then add 1080g sodium hydroxide to the filtrate, stir well to make it dissolve completely, then cool it to -3°C while stirring, when the SO in the solution 4 2- When the concentration is 35g / L, it is separated by filtration to obtain LiOH solution and Na 2 SO 4 10H 2 O solid; when the obtained LiOH solution was evaporated to a liquid-solid volume ratio of about 0.8:1, it was filtered and centrifuged to obtain LiOH·H 2 O primary crude product; add deionized water, stir to dissolve it completely, and make Li in the solution 2 O concentration is 70g / L, add 7.8g refining agent Li 1.3 Ti 0.8 Ce 0.4 Zr 0.5 al 0.3 (PO 4 ) 3 , the temperature was 45°C, stirred and reacted for 120 minutes, and the...

Embodiment 2-24

[0051] Example 2-24 Battery-grade dust-free LiOH·H 2 Preparation of O

[0052] The preparation process is the same as in Example 1, except that the amount of anti-caking agent used and the type of anti-caking agent are different. The specific results are shown in Table 1.

[0053] Table 1

[0054]

[0055] In Table 1, √ means no hardening, × means hardening, × + Indicates that the agglomerate is very hard.

[0056] Qualification in Table 1 refers to compliance with battery-grade product standard indicators:

[0057] Fe%

[0058]As can be seen from the results in Table 1, the selection of dispersants should pay attention to the impact of the substances brought into the product on the impurity content of the product. At the same time, some dispersants will produce a large amount of foam during use, which seriously affects the production. Sodium hexametaphosphate, sodium hexametaphosphate, potassium ferrocyanide, and sodium ferrocyanide are preferred. Insoluble ...

Embodiment 25-48

[0059] Example 25-48 Industrial-grade dust-free LiOH·H 2 Preparation of O

[0060] (1) Preparation of Li 2 LiOH solution with an O concentration of 70±5g / l

[0061] Take Li 2 Li with an O concentration of 38 g / L 2 SO 4 Leach solution 10000ml, add Ca(OH) 2 Adjust pH=7, filter, then add 1080g sodium hydroxide to the filtrate, stir well to make it dissolve completely, then cool it to -3°C while stirring, when the SO in the solution 4 2- When the concentration is 35g / L, it is separated by filtration to obtain LiOH solution and Na 2 SO 4 10H 2 O solid; when the obtained LiOH solution was evaporated to a liquid-solid ratio of about 0.8:1, it was filtered and centrifuged to obtain LiOH·H 2 O primary crude product; add deionized water, stir to dissolve it completely, and make Li in the solution 2 O concentration is 70g / L, it is separated by filtration, and the filtrate is LiOH pure liquid; Wherein Li 2 LiOH solution with an O concentration of 70 g / l, SO 4 2- Concentratio...

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Abstract

The invention refers to a dust-free lithium hydroxide monohydrate and a preparation method thereof, belonging to the technical field of lithium hydroxide. The technical problems to be solved by the invention are that wet LiOH.H2O has a problem of hardening and dry LiOH.H2O has a problem of dust explosion in the prior art. The invention provides a novel LiOH.H2O, that is, dust-free lithium hydroxide monohydrate without hardening. The lithium hydroxide monohydrate is a loosened granular wet product, wherein the content of water is less than or equal to 3.5%, and the surface of the lithium hydroxide monohydrate is coated with a little anti-hardening agent. The dust-free lithium hydroxide monohydrate is prepared by the following methods: (1) preparing a LiOH solution having a Li2O concentration of 70+-5g / l, and the concentration of SO42- is less than or equal to 15g / l; (2) evaporating the LiOH solution obtained in the step (1) until the ratio of liquid to solid is 1: (0.8-1.5); adding a little anti-hardening agent; uniformly stirring; separating and washing the mixture to obtain dust-free wet LiOH.H2O; and carrying out vacuum seal and packing the wet product, wherein the obtained product is not hardened within 3-5 months.

Description

technical field [0001] The invention relates to a dust-free grade lithium hydroxide monohydrate and a preparation method thereof, belonging to the technical field of lithium hydroxide preparation. Background technique [0002] Lithium hydroxide monohydrate (LiOH·H 2 O) has a wide range of uses, and the manufacture of advanced lithium-based grease is the current LiOH·H 2 The field with the largest consumption of O, LiOH·H 2 The lithium-based grease produced by O has a wide temperature range (-50°C to +300°C), good fire resistance, difficult oxidation, stable performance during multiple heating-cooling-heating cycles, long service life, and strong water resistance. In addition, LiOH·H 2 O is also widely used in chemical industry, national defense, battery and other fields. Used in the battery industry as an additive for alkaline storage batteries can prolong their life and increase storage capacity. In national defense, as an ion exchange resin, it can absorb radioactive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F3/18C01D15/02
CPCC01D15/02B01F3/18
Inventor 姚开林金鹏霍立明何东利何开茂彭宗惠涂明江杨柳金和山江虎成
Owner TIANQI LITHIUM CORP
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