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Method for preparing high purity level lithium hydroxide monohydrate

A pure grade technology of lithium hydroxide monohydrate, which is applied in the direction of lithium oxide;

Active Publication Date: 2012-09-12
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the LiOH·H obtained by this method 2 The content standard of the impurity Fe in the O product is 0.0008%, the content standard of the impurity Ca is 0.005%, the content standard of the impurity K is 0.005%, and the impurity CO 2 The content standard is 0.50%, and the LiOH·H obtained by this method 2 O products cannot reach the LiOH·H required for the production of high-purity high-end lithium materials 2 O Requirements for its impurity content

Method used

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  • Method for preparing high purity level lithium hydroxide monohydrate
  • Method for preparing high purity level lithium hydroxide monohydrate
  • Method for preparing high purity level lithium hydroxide monohydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Example 1 High-purity grade LiOH·H 2 Preparation of O

[0044] (1), take Li 2 Li with an O concentration of 38 g / L 2 SO 4 Leach solution 10000ml, add Ca(OH) to it 2 Regulate pH=9, filter to obtain lithium sulfate primary purification solution, the concentration of impurity in the purification solution is reduced to Fe 3+ 0.38g / l, silicon 9.40g / l, aluminum 0.0032g / l, manganese 0.0027g / l. Add 1100g of sodium hydroxide to the primary purification solution of lithium sulfate, stir well to dissolve it 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 Na 2 SO 4 10H 2 O solid and LiOH solution;

[0045] (2), the LiOH solution obtained in step (1) is filtered through a precision microporous filter tube to obtain the LiOH solution pure liquid; the concentration of impurity calcium in the LiOH pure liquid is 0.5g / l, and the concentration of impurity magnesium is 0.00...

Embodiment 2

[0054] Example 2 High-purity grade LiOH·H 2 Preparation of O

[0055] (1), take Li 2 Li with an O concentration of 38 g / L 2 SO 4 Leach solution 10000ml, add Ca(OH) to it 2 Regulate pH=10, filter to obtain lithium sulfate primary purification solution, the concentration of impurity in the purification solution is reduced to Fe 3+ 0.45g / l, silicon 8.3g / l, aluminum 0.0040g / l, manganese 0.0034g / l, then add 980g sodium hydroxide to the primary purification solution of lithium sulfate, fully stir to make it completely dissolve, and then put the It is cooled to -2°C, when SO in solution 4 2- When the concentration is 32g / L, it is separated by filtration to obtain Na 2 SO 4 10H 2 O solid and LiOH solution;

[0056] (2), the LiOH solution obtained in step (1) is filtered through a precision microporous filter tube to obtain the LiOH solution pure liquid; the concentration of impurity calcium in the LiOH pure liquid is 0.45g / l, and the concentration of impurity magnesium is 0....

Embodiment 3

[0065] Example 3 High-purity grade LiOH·H 2 Preparation of O

[0066] (1), 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=10 to filter to obtain lithium sulfate primary purification solution, and the concentration of impurities in the purification solution is reduced to Fe 3+0.28g / l, silicon 8.5g / l, aluminum 0.0034g / l, manganese 0.0031g / l, then add 980g sodium hydroxide to the primary purification solution of lithium sulfate, fully stir to dissolve it completely, and then put the It is cooled to -6°C, when SO in solution 4 2- When the concentration is 28g / L, it is separated by filtration to obtain Na 2 SO 4 10H 2 O solid and LiOH solution;

[0067] (2), the LiOH solution of step (1) gained is filtered through precise microporous filter tube to obtain LiOH solution pure liquid; The concentration of impurity calcium in described LiOH pure liquid is 0.37g / l, the concentration of impurity magnesium is 0.0065g / l ...

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Abstract

The invention relates to a method for preparing a high purity level lithium hydroxide monohydrate and belongs to the technical field of lithium hydroxide preparations. The method includes the following steps of adding calcium hydroxide into a lithium sulfate leaching liquid to adjust the potential of hydrogen (pH) value, filtering to obtain a lithium sulfate primary cleaning liquid, adding sodium hydroxide, then filtering and removing impurities, crystallizing to obtain a sodium sulfate decahydrate solid and a lithium hydroxide refrigerating fluid, finely filtering the lithium hydroxide refrigerating fluid, then performing an evaporating separation to obtain a Lithium hydroxide monohydrate primary crude product, dissolving the crude product by adding water, adding a refining agent to remove sodium, then performing an evaporation concentration, separating and leaching to obtain a Lithium hydroxide monohydrate secondary crude product, adding water into the secondary crude product, performing the evaporation concentration, cooling to crystallize, and drying to obtain the high purity level lithium hydroxide monohydrate. By means of the method, the evaporation liquid-solid ratio is reasonably controlled, and processes of crystallizing and crystal growing are modified, so that the high purity level lithium hydroxide monohydrate product is obtained, the process is simple, the operation is easy, the equipment investment is few, the product cost is low, the lithium recovery rate is high, product qualities are stable, and the method is suitable for the industrialized production of the high purity level lithium hydroxide monohydrate.

Description

technical field [0001] The invention relates to a preparation method of high-purity lithium hydroxide monohydrate, 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 isotopes, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
Inventor 何东利金鹏何开茂刘元礼彭宗惠何雄艾家圆
Owner TIANQI LITHIUM CORP
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