Method for producing aluminum fluoride

A production method and technology of aluminum fluoride, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of large investment in dry process equipment, high production process raw material prices, and high production costs, and achieve abundant reserves and good promotion and application value. , the effect of reducing production costs

Inactive Publication Date: 2005-06-15
DO FLUORIDE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw material price of the above-mentioned production process is high, the production c

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  • Method for producing aluminum fluoride
  • Method for producing aluminum fluoride

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Embodiment 1

[0018] The method for producing aluminum fluoride of the present invention is as follows: first, 500g of hydrofluoric acid with a concentration of 30% is heated to 60°C, and reacted with 560g of calcined kaolinite, and 560g of water is added during the reaction, the reaction temperature is 85°C, and the reaction time is For 15 minutes, control the pH at the end of the reaction to 1.5. After the reaction, fully filter and wash the kaolin slag. The filtrate obtained is an aluminum fluoride solution, and then the aluminum fluoride solution is crystallized to obtain aluminum fluoride trihydrate, and then dried Dehydration to produce aluminum fluoride products.

Embodiment 2

[0020] The method for producing aluminum fluoride in this embodiment is as follows: firstly heat 750g of hydrofluoric acid with a concentration of 20% to 70°C, then react with 550g of calcined kaolinite, and add 310g of water, the reaction temperature is 90°C, and the reaction time is For 20 minutes, control the pH at the end of the reaction to 2.0. After the reaction is over, filter and wash the kaolin slag, and the obtained filtrate is an aluminum fluoride solution, and then crystallize the aluminum fluoride solution to obtain aluminum fluoride trihydrate, and then dry and dehydrate , to produce aluminum fluoride products.

Embodiment 3

[0022] The method for producing aluminum fluoride of the present embodiment is as follows: 375g concentration is 20% hydrofluoric acid and 370g calcined kaolinite react, add 500g water in the reaction process, reaction temperature 95 ℃, reaction time 25 minutes, control The pH at the end of the reaction is 3.0. After the reaction is finished, filter and wash the kaolin slag, and the obtained filtrate is aluminum fluoride solution, and then the aluminum fluoride solution is crystallized to obtain aluminum fluoride trihydrate, and then dried and dehydrated to obtain fluoride Aluminum products.

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Abstract

A process for preparing aluminium fluoride incldues such steps as reaction between hydrofluoric acid and kaolinite at 80-100 deg.C for 10-30 min, filter, washing the kaolinite dregs with filtrate to obtain solution of aluminium fluoride, crystallizing to obtain trihydrated aluminium fluoride, and drying.

Description

technical field [0001] The present invention relates to a method for producing 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 dry process are hydrogen fluoride and aluminum hydroxide. After mixed reaction, aluminum trifluoride is produced at the bottom of the reactor, and the aluminum trifluoride is sent to the drum to cool to obtain the finished product. 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 f...

Claims

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Application Information

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IPC IPC(8): C01F7/50
Inventor 李世江侯红军杨华春李海生皇甫根利于贺华张富山
Owner DO FLUORIDE CHEM CO LTD
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