Preparation method of dust-free-level lithium hydroxide monohydrate

A technology of lithium hydroxide and lithium sulfate monohydrate, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of low main content and inability to meet the requirements of the product, and achieve high lithium recovery rate, low product cost and equipment investment. less effect

Active Publication Date: 2014-02-12
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of process conditions, the main content of the product is too low, and the LiOH content can only reach 55%; it cannot meet the needs of relevant customers for the main content of the product (LiOH content ≥ 56.5%)

Method used

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  • Preparation method of dust-free-level lithium hydroxide monohydrate
  • Preparation method of dust-free-level lithium hydroxide monohydrate
  • Preparation method of dust-free-level lithium hydroxide monohydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Dust-free LiOH·H 2 Preparation of O

[0036] (1) Take Li 2 Li with an O concentration of 38 g / L 2 SO 4 Leaching solution 3m 3 , to which Ca(OH) is added 2 Adjust pH=11, filter to obtain lithium sulfate primary purification solution;

[0037] (2) Add 33kg of sodium hydroxide to the lithium sulfate primary purification solution obtained in step (1), stir well to dissolve it completely, then cool it to -3°C under stirring, and the solution contains S0 4 2- When the concentration is 30g / l, it is separated by filtration to obtain LiOH solution and Na 2 SO 4 10H 2 O solid;

[0038] (3) Filter the LiOH solution obtained in step (2) to obtain a pure LiOH solution; evaporate the LiOH pure liquid until the liquid-solid phase volume ratio is about 1:1, then filter and centrifuge it to obtain LiOH·H 2 O crude product;

[0039] (4) To the LiOH·H obtained in step (3) 2 Add deionized water to the O crude product, stir to dissolve it completely, and make Li in th...

Embodiment 2—36

[0043] Example 2-36 Dust-free LiOH·H 2 Preparation of O

[0044] The preparation process is the same as in Example 1, except that the types and contents of the modifying reagents added in steps (4) and (6) are different. The specific implementation results are shown in Table 1.

[0045]

[0046]

[0047] In Table 1, √ means no hardening, × means hardening, × + Indicates that the agglomerate is very hard. "Qualified" in Table 1 means that the obtained product meets the index of dust-free lithium hydroxide monohydrate product. The specific indicators are as follows:

[0048] Table 2

[0049]

Main content%

Fe%

Na+K%

Ca%

Cl - %

SO 4 2- %

CO 2 %

acid insoluble matter

Water insoluble matter

Example 1

56.7

0.0012

0.008

0.006

0.0013

0.015

0.23

0.002

0.006

Example 2

56.5

0.0010

0.012

0.005

0.0010

0.016

0.26

0.002

0.008

Example 3 ...

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Abstract

The invention relates to a novel preparation method of dust-free-level lithium hydroxide monohydrate, and belongs to the technical field of lithium hydroxide. The novel preparation method is characterized by comprising the following steps of: (1) preparing LiOH solution in a concentration of 60-75 g / L; (2) adding a modified reagent in the LiOH solution in the step (1), heating the solution and raising the temperature to 85-95 DEG C, and then, filtering and separating to obtain a filtered solution; (3) evaporating the filtered solution obtained in the step (2) until the liquid-solid volume ratio becomes 1:0.8-1.0, carrying out cooling, crystallizing, separating and eluting to obtain a wet product of LiOH.H2O; (4) drying the wet product obtained in the step (3), adding modified reagent, uniformly mixing and stirring, and cooling the mixture to a proper temperature, thus finishing the preparation. The modified reagent is one or combination of more of sodium lauryl sulfate, paraffin wax, fatty acid polyethylene glycol ester, dioctyl hyaluronate sodium, dibromoethane, fatty acid sorbitan, sodium dodecyl sulfate, methyl amyl alcohol, stearic acid, etc. The method disclosed by the invention can avoid flying dust in the use of the product, prevent the product from caking during the long-term storage, and guarantee the main content of the product.

Description

technical field [0001] The invention relates to a preparation method of dust-free 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 can...

Claims

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Application Information

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Patent Type & Authority Patents(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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