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Preparation method of lithium fluoride

A lithium fluoride and lithium carbonate technology, applied in the direction of lithium halide, etc., can solve the problems of product agglomeration, affecting the screening process, fine particle size, etc., and achieve the effect of low cost and high yield

Inactive Publication Date: 2011-04-27
SHANGHAI CHINA LITHIUM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the product is finer, the solid-liquid separation is incomplete, more soluble impurities are brought in, and the product agglomeration phenomenon is more serious during drying, which affects the screening process
It needs to use more alkaline substances such as ammonia water to adjust the pH, which increases the product cost and introduces related impurities

Method used

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  • Preparation method of lithium fluoride

Examples

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Effect test

Embodiment 1

[0021] The raw material lithium carbonate is industrial grade lithium carbonate, wherein the weight content of lithium carbonate is 99.07%, sodium (Na) is 775PPm, magnesium (Mg) is 112PPm, iron (Fe) is 52PPm, potassium (K), aluminum (Al) , copper (Cu) is 20PPm, calcium (Ca) is 221PPm, sulfate (SO 4 2- ) is 1466PPm.

[0022] (1) 1.8M 3 In the stainless steel reaction tower, add 1400L of pure water, turn on carbon dioxide (control the pressure at 0.15Mpa), add 60Kg of industrial grade lithium carbonate, add 0.12Kg oxalic acid, add 0.29Kg barium hydroxide; Dissolve completely, and then filter with a polypropylene plate and frame filter press to obtain a lithium bicarbonate solution.

[0023] (2)5M 3 In the polypropylene reaction tank, add the lithium bicarbonate solution 4000L of step (1), then add 242Kg of hydrofluoric acid, the solution pH=5, keep stirring at 35° C. for 30 minutes, add the lithium hydroxide solution that the weight concentration is 15%, adjust The pH of th...

Embodiment 2

[0026] Raw material lithium carbonate is industrial grade lithium carbonate, wherein, the weight content of lithium carbonate is 99.12%, sodium (Na) content is 855PPm, magnesium (Mg) content is 107PPm, iron (Fe) is 48PPm, potassium (K), aluminum ( Al), copper (Cu) is 20PPm, calcium (Ca) content is 285PPm, sulfate content (SO 4 2- ) is 1521PPm.

[0027] (1) 1.8M 3 In the stainless steel reaction tower, add 1400L of pure water, turn on carbon dioxide (control the pressure at 0.2Mpa), add 60Kg of industrial grade lithium carbonate, add 0.16Kg of oxalic acid, add 0.301Kg of barium hydroxide, and feed carbon dioxide until pH = 8, lithium carbonate Dissolve completely, and then filter with a polypropylene plate and frame filter press to obtain a lithium bicarbonate solution.

[0028] (2)5M 3 In the polypropylene reaction tank, add the lithium bicarbonate solution 4000L of step (1), then add 242.3Kg of hydrofluoric acid, the solution pH=5, keep stirring at 34.3° C. for 34 minutes...

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Abstract

The invention provides a preparation method of lithium fluoride, which comprises the following steps: (1) introducing carbon dioxide into water, then adding the raw material lithium carbonate to obtain a lithium bicarbonate solution, then adding a precipitant, introducing carbon dioxide until the pH of the solution is 8-9, filtering, and collecting the lithium bicarbonate solution; and (2) adding hydrofluoric acid to the filtrate obtained in the step (1), carrying out fluoridation, then adding a lithium hydroxide solution, regulating the pH of the system to be 7-7.5, then filtering, collecting the filter cake, and drying to obtain the product lithium fluoride. In the invention, the industrial grade lithium carbonate is used, the total yield of the technical process achieves more than 97%, the purity is as high as 99.9% or above, and the impurity content in the product is as low as 80PPm or below.

Description

technical field [0001] The invention relates to a preparation process of lithium fluoride. Background technique [0002] Lithium fluoride can be used as a flux in enamel, glass, and ceramic industries, as well as a flux in brazing flux and molten salt chemistry. In addition, it is also used as a raw material for heat receivers in spacecraft to store solar radiation heat energy. In recent years, with the continuous development of lithium battery technology, lithium-ion batteries have become the rechargeable power supply of today's portable electronic products due to their advantages such as high specific energy, high power density, long cycle life, small self-discharge, and high cost performance. In the main select object. At the same time, in order to alleviate environmental pressure, countries around the world are competing to develop hybrid electric vehicles (HEV) that use both batteries and mechanical power. According to market forecasts in Japan, the United States and E...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 米泽华付文宝
Owner SHANGHAI CHINA LITHIUM INDAL
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