Crystallization method of aluminium fluoride

A technology of aluminum fluoride and crystallization, which is applied in the direction of aluminum fluoride and aluminum halide, can solve the problems of difficult dehydration of aluminum fluoride, high equipment requirements, and high energy consumption, and achieve easy drying and dehydration, lower equipment requirements, and low energy consumption. Reduced effect

Inactive Publication Date: 2006-09-13
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this crystallization method are: (1) the product contains a large amount of crystal water, the dehydration of aluminum fluoride is difficult, the energy consumption is high, the speed is slow, and the equipment requirements are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The crystallization method of aluminum fluoride in this example is as follows: the aluminum fluoride solution obtained by the reaction is subjected to high-temperature crystallization under pressure, the crystallization temperature is 140°C, and the pressure is 3 atmospheres. After the crystallization is completed, aluminum fluoride less than one crystal water is obtained. , and then dried and dehydrated to obtain aluminum fluoride products.

Embodiment 2

[0009] In the crystallization method of aluminum fluoride in this embodiment, the aluminum fluoride solution obtained by the reaction is subjected to high-temperature crystallization under high pressure, the crystallization temperature is 150° C., and the pressure is 4 atmospheres. After the crystallization is completed, aluminum fluoride less than one crystal water is obtained. After drying and dehydration, the aluminum fluoride product is obtained.

Embodiment 3

[0011] In the crystallization method of aluminum fluoride in this embodiment, the aluminum fluoride solution obtained by the reaction is subjected to high-temperature crystallization under pressure, the crystallization temperature is 160° C., and the pressure is 5 atmospheres. After the crystallization is completed, aluminum fluoride less than one crystal water is obtained. After drying and dehydration, the aluminum fluoride product is obtained. aluminum fluoride in water, and then dried and dehydrated to obtain aluminum fluoride products.

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PUM

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Abstract

A process for crystallizing aluminum fluoride from the resultant aluminum fluoride solution includes such steps as crystallizing at 130-200 deg.C under 3-5 atom, filtering, washing, and drying. It has high volume weight.

Description

technical field [0001] The invention relates to a crystallization method of aluminum fluoride. Background technique [0002] Aluminum fluoride is used as an additive in the production of electrolytic aluminum to lower the melting point of the electrolyte and increase the conductivity of the electrolyte. Its traditional production process is hydrofluoric acid-dry method and hydrofluoric acid-wet method. Hydrofluoric acid - the raw materials of the wet process are hydrofluoric acid and aluminum hydroxide, and the production process is the reaction and crystallization of hydrofluoric acid and aluminum hydroxide slurry to obtain aluminum fluoride trihydrate, which is then dried and dehydrated to obtain fluorine Aluminum products. The raw material price of the above-mentioned production process is high, the production cost is high, the dry process equipment investment is large, and the process is complicated. Hydrofluoric acid - the crystallization of aluminum fluoride in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
Inventor 李世江侯红军杨华春皇甫根利闫春生张良张金保
Owner DO FLUORIDE CHEM CO LTD
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