Method for preparing battery-stage monohydrate lithium hydroxide

A monohydrate lithium hydroxide, battery-grade technology, applied in the direction of lithium oxide;/hydroxide, battery electrodes, circuits, etc., can solve the problems of immature lithium hydroxide technology, serious equipment corrosion, complicated process flow, etc. Achieve the effects of easy operation, low equipment investment and high lithium recovery rate

Active Publication Date: 2008-07-09
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the use of magnesium makes the process complicated, the equipment is corroded seriously, the amount of evaporated water is large, and the

Method used

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  • Method for preparing battery-stage monohydrate lithium hydroxide

Examples

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Comparison scheme
Effect test

Embodiment 1

[0063] Referring to Fig. 1, battery-grade LiOH·H in Example 1 of the present invention 2 The preparation method of O comprises the following steps:

[0064] (1) Take purification solution 12, 280ml, add 982g sodium hydroxide, stir well to dissolve it completely, then cool it to -8°C while stirring, when Na in the solution + When the concentration is 10g / l, it is separated by filtration to obtain Na 2 SO 4 10H 2 O solid and LiOH slurry;

[0065] (2), when the LiOH liquid obtained in step (1) is evaporated to a liquid-solid ratio of about 1:1, when cooled to 35° C., it is filtered and centrifuged, and 285 ml of deionized water is added for rinsing to obtain 424 g LiOH. h 2 O one crude product;

[0066] (3), LiOH·H obtained in step (2) 2 Add 3,365ml deionized water to the primary crude product, stir to make it dissolve completely, and obtain LiOH·H 2 O primary heavy solution of crude product;

[0067] (4), LiOH·H obtained in step (3) 2 O once crude product heavy solutio...

Embodiment 2

[0072] Referring to Figure 1, Example 2 of the present invention battery-grade LiOH·H 2 The preparation method of O comprises the following steps:

[0073] (1) Take 12280ml of purified solution, add 803g of sodium hydroxide, stir fully to dissolve it completely, then cool it to -2°C while stirring, when Na in the solution + When the concentration is 20g / l, it is separated by filtration to obtain Na 2 SO 4 10H 2 O solid and LiOH slurry;

[0074] (2), when the LiOH liquid obtained in step (1) is evaporated to a liquid-solid ratio of about 1:1, when cooled to 45° C., it is filtered and centrifuged, and 280 ml of deionized water is added for rinsing to obtain 416 g LiOH. h 2 O one crude product;

[0075] (3), LiOH·H obtained in step (2) 2 Add 2,701ml of deionized water to the primary crude product, stir to make it dissolve completely, and obtain LiOH·H 2 O primary heavy solution of crude product;

[0076] (4), LiOH·H obtained in step (3) 2 O once crude product heavy solu...

Embodiment 3

[0080] Referring to Figure 1, Example 3 of the present invention battery-grade LiOH·H 2 The preparation method of O comprises the following steps:

[0081] (1), take 12,280ml of the purified solution, add 884g of sodium hydroxide, stir it fully to dissolve it completely, then cool it to -5°C while stirring, when the Na in the solution + When the concentration is 16g / l, it is separated by filtration to obtain Na 2 SO 4 10H 2 O solid and LiOH slurry;

[0082] (2), when the LiOH liquid obtained in step (1) is evaporated to a liquid-solid ratio of about 1: 1, when cooled to 41° C., it is filtered and centrifuged, and 270 ml of deionized water is added for rinsing to obtain 421 g LiOH. h 2 O one crude product;

[0083] (3), LiOH·H obtained in step (2) 2 Add 3,007ml deionized water to the primary crude product, stir to make it dissolve completely, and obtain LiOH·H 2 O primary heavy solution of crude product;

[0084] (4), LiOH·H obtained in step (3) 2 O once crude product...

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Abstract

The invention provides a process for preparing battery grade lithium hydroxide monohydrate, comprising: (1) adding sodium hydroxide in lithium sulfate purification fluid and obtaining solid of Na2SO4, 10H2O and liquid of LiOH after completely dissolving and cooling, (2) obtaining liquid of LiOH after filtering and separating, (3) evaporating and concentrating the liquid of LiOH and filtering, separating and leaching the liquid of LiOH after cooling and crystallizing to obtain one-time crude product of LiOH, H2O, (4) adding deionized water in the one-time crude product of LiOH, H2O and obtaining re-dissolving solution of the one-time crude product of LiOH, H2O, (5) adding refining agent in the re-dissolving solution of the one-time crude product of LiOH, H2O and obtaining filtrate of LiOH refined liquor after filtering and separating, (6) filtering and separating the LiOH refined liquor after evaporating, concentrating, cooling and crystallizing to obtain solid of battery grade wet product of LiOH, H2O and (7) taking out the battery grade wet product of LiOH, H2O after drying to obtain battery product of LiOH, H2O. The invention is simple in production process, easy operation and perfect product quality.

Description

Technical field: [0001] The invention relates to a preparation method of battery-grade lithium hydroxide monohydrate. 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. At present, the world's lithium-based grease production accounts for 73.41% of the total grease production, of which China accounts for 82.42%, North America accounts for 68.34%, and Europe accounts for 67.98%. In addition, LiOH·H 2 O is also widely used in chemical industry, national defense, battery and other fields. In the battery industry, it can be used as an alkaline storage batter...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/48H01M4/485
CPCY02E60/10
Inventor 姚开林金鹏霍立明涂明江董华波黄春莲夏光友
Owner TIANQI LITHIUM CORP
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