Method for preparing lithium fluoride

A variety of lithium fluoride and lithium fluoride technologies, applied in the direction of lithium halide, etc., can solve the problems of lithium fluoride purity not meeting the requirements, poor fluidity, and high alkaline impurities, so as to avoid product quality and good fluidity , the effect of high purity

Active Publication Date: 2010-06-09
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the expansion of the application field of lithium fluoride, the demand for lithium fluoride is also increasing, and its quality requirements are also getting higher and higher, such as lithium fluoride used in lithium batteries, ceramic materials, optical glass and other industries High purity is required. There are many existing methods for producing lithium fluoride, all of which have some shortcomings. Some of the produced lithium fluoride cannot meet the requirements, some contain high levels of alkaline impurities, and some have poor fluidity. , it is difficult to meet the requirements of lithium fluoride raw materials for the preparation of some new products

Method used

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  • Method for preparing lithium fluoride
  • Method for preparing lithium fluoride
  • Method for preparing lithium fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The reaction principle of producing lithium fluoride in this example is:

[0018] Li 2 CO 3 +H 2 O+CO 2 ==2LiHCO 3 (P CO2 =0.40~0.45MPa)

[0019] LiHCO 3 +HF=LiF↓+CO 2 ↑+H 2 o

[0020] Main production process:

[0021] 1. Carbonation reaction

[0022] Add 2.5m3 pure water into the carbonization kettle, then put in 75kg of high-purity lithium carbonate, and cover the hand hole tightly. Start stirring, turn on the circulating cooling water, then slowly open the carbon dioxide gas control valve, raise the pressure in the carbonization kettle to 0.4MPa for reaction, and continue to maintain this pressure for 3 hours to obtain lithium bicarbonate solution.

[0023] The specifications of the main raw materials used above are

[0024] 1. Pure water quality requirements (ppm)

[0025]

[0026] 2. Quality requirements for high-purity lithium carbonate (ppm)

[0027]

[0028] 3. Carbon dioxide: industrial grade, the content is not less than 99.9%.

[0029] 2...

Embodiment 2

[0055] Main production process:

[0056] 1. Carbonation reaction

[0057] Add 2m into the carbonization kettle 3 Pure water, then put in 100kg of high-purity lithium carbonate, and cover the hand hole tightly. Start stirring, turn on the circulating cooling water, then slowly open the carbon dioxide gas control valve, raise the pressure in the carbonization kettle to 0.45MPa for reaction, and continue to maintain this pressure for 2.5 hours to obtain lithium bicarbonate solution.

[0058] The purity of the main raw materials used above, pure water, high-purity lithium carbonate and carbon dioxide raw materials are all greater than 99.9%

[0059] 2. Filtering:

[0060] After the carbonization reaction is complete, the carbonized solution is filtered through a 5 μm sintered ceramic precision filter, and the filtrate is poured into the batching tank.

[0061] 3. Neutralization reaction:

[0062] Start the stirring of the lithium bicarbonate solution in the batching tank, tur...

Embodiment 3-5

[0072]

[0073] The lithium fluoride product that above-mentioned embodiment produces all can reach the requirement of the object of the present invention.

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Abstract

The invention relates to a method for preparing lithium fluoride, which is characterized by comprising the following steps of: mixing high-purity lithium carbonate with pure water, and introducing carbon dioxide gas to carry out the carburization reaction for obtaining a lithium bicarbonate solution; precisely filtering the lithium bicarbonate solution; introducing hydrofluoric acid gas into the lithium bicarbonate solution, stirring to carry out the neutralization reaction, and controlling the pH value to be 0.5-3 to prepare lithium fluoride slurry; centrifugally separating the lithium fluoride slurry to separate solid from liquid of the lithium fluoride slurry; and drying the separated solid lithium fluoride to obtain a finished product. The method of the invention has the advantage of simple technology; the prepared lithium fluoride has the advantages of high purity, good liquidity, no alkaline impurities and neutral state; and the product can achieve the lithium fluoride grade of battery levels.

Description

technical field [0001] The invention belongs to the technical field of production methods of chemical products, and in particular relates to a preparation method of lithium fluoride, in particular to a preparation method for producing battery-grade lithium fluoride. Background technique [0002] With the expansion of the application field of lithium fluoride, the demand for lithium fluoride is also increasing, and its quality requirements are also getting higher and higher, such as lithium fluoride used in lithium batteries, ceramic materials, optical glass and other industries High purity is required. There are many existing methods for producing lithium fluoride, all of which have some shortcomings. Some of the produced lithium fluoride cannot meet the requirements, some contain high levels of alkaline impurities, and some have poor fluidity. , it is difficult to meet the requirements of lithium fluoride raw materials for the preparation of some new products. Contents of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04
Inventor 李良彬邓招男胡耐根李义曾辉如黄学武何新天
Owner GANFENG LITHIUM CO LTD
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