Method for removing aluminium fluoride crystal water

A technology of aluminum fluoride and crystal water, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve the problems of main content reduction, aluminum fluoride hydrolysis, crystal water cannot be removed, etc., and achieve the effect of low water content

Inactive Publication Date: 2004-09-29
焦作市多氟多化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The drying and calcining devices used are rotary kilns, airflow calcining furnaces, etc., and the above methods can only remove the attached water and part of the crystal water, and some of the crystal water cannot be removed. The water content of the finished aluminum fluoride is usually 6 %about
In these devices, aluminum fluoride is in a state of relative motion. If the temperature reaches above 400°C, a large amount of aluminum fluoride will be hydrolyzed, resulting in a significant decrease in the main content.

Method used

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  • Method for removing aluminium fluoride crystal water

Examples

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Effect test

Embodiment 1

[0009] Aluminum fluoride with a water content of 6.58%, an F content of 59.89%, and an Al content of 29.85% is placed in the high temperature zone of a high-temperature static calciner at a temperature of 400°C for 30 minutes, and then cooled to obtain an aluminum fluoride product. The water content is 0.51%, the F content is 63.75%, and the Al content is 32.96%.

Embodiment 2

[0011] Aluminum fluoride with a water content of 5.48%, an F content of 60.10%, and an Al content of 30.25% is placed in the high temperature zone of a high-temperature static calciner at a temperature of 500°C for 25 minutes, and then cooled to obtain an aluminum fluoride product. The obtained water content is 0.49%, the F content is 63.92%, and the Al content is 33.10%.

Embodiment 3

[0013] Aluminum fluoride with a water content of 5.21%, an F content of 60.25%, and an Al content of 30.40% is placed in the high temperature zone of a high-temperature static calciner at a temperature of 600°C for 20 minutes, and then cooled to obtain an aluminum fluoride product. The water content is 0.43%, the F content is 63.98%, and the Al content is 33.25%.

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Abstract

The process of eliminating crystalline water in aluminum fluoride includes the following steps: producing aluminum fluoride product with hydrofluoric acid in a wet process; calcining aluminum fluoride product statically under 400-600 deg.c for 20-30 min; cooling to eliminate crystalline water in aluminum fluoride. The said process can eliminate crystalline water in aluminum fluoride completely to obtain aluminum fluoride product with high aluminum fluoride content and low water content without hydrolysis of aluminum fluoride.

Description

technical field [0001] The invention relates to a method for removing crystal water of aluminum fluoride. Background technique [0002] Aluminum fluoride is used as a flux in the production of electrolytic aluminum to lower the melting point of the electrolyte and increase the conductivity of the electrolyte. The traditional production process of aluminum fluoride is hydrofluoric acid-wet process, and the fluorine Aluminum contains a large amount of crystallization water and attached water, so it needs to be removed. At present, the method used to remove the crystallization water and attached water in aluminum fluoride is: the aluminum fluoride ointment produced by the wet process of hydrofluoric acid is dried and calcined to remove the attached water and part of the crystallized water to obtain hydrogen Aluminum fluoride finished product produced by hydrofluoric acid wet process. The drying and calcining devices used are rotary kilns, airflow calcining furnaces, etc., and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
Inventor 李世江杨华春侯红军张富山皇甫根利连小闯刘慈军
Owner 焦作市多氟多化工有限公司
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