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Aluminum fluoride preparation method

A technology of aluminum fluoride and method aluminum fluoride, which is applied in the field of preparation of inorganic fluorides, can solve the problems of polluting the environment, affecting product quality, waste, etc., achieving good social benefits, alleviating the shortage of raw material supply, and facilitating the acquisition of materials.

Inactive Publication Date: 2018-02-16
达州励志环保科技有限公司
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

If this part of the material is dried and added to the aluminum fluoride product, it will seriously affect the product quality; if this part of the material is discarded as waste, it will not only cause a lot of waste, but also seriously pollute the environment, so how to use it reasonably Some materials have become technical problems that need to be solved urgently

Method used

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preparation example Construction

[0024] A method for preparing aluminum fluoride, which uses recycled materials produced in the dry aluminum fluoride production process, reacts with hydrofluoric acid, crystallizes, filters, separates, dries, and dehydrates to obtain aluminum fluoride products. The compound reaction formula for:

[0025] 3HF+Al(OH)3→AlF3+3H2O

[0026] 6HF+Al2O3→2AlF3+3H2O.

Embodiment 1

[0028] In a 2L stirred reactor, add 900mL of 25% hydrofluoric acid, heat to 70°C, slowly add 500g of recycled aluminum fluoride material under stirring, pay close attention to the reaction changes during the feeding process, and control the feeding speed to prevent the material from escaping. Out of the reactor, the entire feeding time is 15 minutes. After the feeding is completed, it crystallizes at 90° C., and the product precipitates for 120 minutes. After continuous vacuum filtration, drying, and dehydration, qualified aluminum fluoride products are obtained.

Embodiment 2

[0030] In a 30L stirred reactor, add 11L of 29% hydrofluoric acid, heat to 65°C, slowly add 7.5Kg of recycled aluminum fluoride materials under stirring, pay close attention to the reaction changes during the feeding process, and control the feeding speed to prevent material Out of the reactor, the entire feeding time is 15 minutes. After the feeding, it crystallizes at 88° C., and the product precipitates for 130 minutes. It continues to be vacuum filtered, dried, and dehydrated to obtain a qualified aluminum fluoride product.

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Abstract

The invention discloses an aluminum fluoride preparation method which comprises the following steps: enabling recycled materials generated in the production process of dry-method aluminum fluoride toreact with hydrofluoric acid, and performing crystallization, filtration, separation, drying and dehydration, thereby obtaining an aluminum fluoride product. By adopting the technical scheme that thealuminum fluoride product is prepared from the recycled materials generated in the production process of dry-method aluminum fluoride and hydrofluoric acid through common processes and equipment, thedefects that the product quality can be seriously affected if recycled aluminum fluoride materials are put into an aluminum fluoride product after being dried, or great waste and serious environment pollution can be caused if the recycled aluminum fluoride materials are discarded, are overcome; and the aluminum fluoride preparation method is applicable to preparation of inorganic fluorides, and isparticularly applicable to preparation of aluminum fluoride prepared from a raw material, namely the recycled materials generated in the production process of dry-method aluminum fluoride.

Description

technical field [0001] The invention relates to the preparation of inorganic fluorides, in particular to a method for preparing aluminum fluoride using recycled materials in the dry aluminum fluoride production process as raw materials. Background technique [0002] The existing aluminum fluoride is an important raw material in the process of producing metal aluminum by electrolysis. The method of directly producing aluminum fluoride by the reaction of hydrogen fluoride gas and aluminum hydroxide in a fluidized bed is called a dry process, because this process has the product The characteristics of good quality, energy saving and environmental protection have been rapidly popularized in China in recent years. At present, the production capacity of dry-process aluminum fluoride in China has reached more than 60% of the world's production capacity. [0003] Aluminum hydroxide is one of the main raw materials for the production of aluminum fluoride. Because most domestic alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
CPCC01F7/50
Inventor 刘泽君
Owner 达州励志环保科技有限公司
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