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Method of synthesizing cryolite by sodium tetrafluoroaluminate

A technology of sodium tetrafluoroaluminum and cryolite, applied in aluminum fluoride, aluminum halide and other directions, can solve the problems of difficult separation, high silica content, and difficulty in meeting the requirements of cryolite quality indicators, and achieves low environmental load and environmental protection. high-efficiency effect

Inactive Publication Date: 2018-02-16
达州励志环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the first step is to obtain sodium fluoride and silicon dioxide will be produced at the same time. It is difficult to completely separate the two. The content of silicon dioxide in sodium fluoride is relatively high, and the quality index is difficult to meet the requirements. Naturally, the ice crystals synthesized in the second step Stone quality indicators are also difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Grind 10g sodium tetrafluoroaluminum sodium by-product and 3g industrial sodium fluoride evenly, put it in a 500°C muffle furnace for calcination for 1h, then cool down to 300°C and keep the temperature constant for 30min, take out the material, cool and weigh 11.5g, then add 4% 60g of hydrofluoric acid, start stirring, stirring rate 200rpm, react for 20min, suction filter, wash, dry to obtain 11.3g cryolite product. After testing, the cryolite content is 87.5%, the silicon content is 0.26%, the molecular ratio is 2.43, and the bulk density is 0.56g / cm3.

Embodiment 2

[0026] Grind 10g sodium tetrafluoroaluminum sodium by-product and 5g industrial sodium fluoride evenly, put it in a 600°C muffle furnace for calcination for 2h, then lower the temperature to 300°C and keep the temperature constant for 30min, take out the material, cool and weigh 14.2g, then add 4% 150g of hydrofluoric acid, start stirring, stirring rate 200rpm, react for 30min, suction filter, wash, dry to obtain 13.9g cryolite product. After testing, the cryolite content is 97.4%, the silicon content is 0.21%, the molecular ratio is 2.72, and the bulk density is 0.69g / cm3.

Embodiment 3

[0028] Grind 10g sodium tetrafluoroaluminum sodium by-product and 7g industrial sodium fluoride evenly, put it into a 700°C muffle furnace for calcination for 3h, then cool down to 300°C and keep the temperature constant for 30min, take out the material, cool and weigh 16.2g, then add 4% 200g of hydrofluoric acid, start stirring, stirring rate 200rpm, react for 40min, suction filter, wash, dry to obtain 15.9g cryolite product. After testing, the cryolite content is 98.5%, the silicon content is 0.17%, the molecular ratio is 2.84, and the bulk density is 0.77g / cm3.

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Abstract

The invention discloses a method of synthesizing cryolite by sodium tetrafluoroaluminate and belongs to the technical field of inorganic fluorine chemical engineering. According to the technical scheme, the method comprises the following steps: firstly, uniformly grinding a certain amount of sodium tetrafluoroaluminate and sodium fluoride to obtain a gray solid mixture; secondly, putting the graysolid mixture in a Muffle furnace to be calcined, controlling the calcining temperature and the calcining time to obtain a calcined product cryolite, and then reducing the temperature to 300 DEG C andkeeping the constant temperature for 30min to improve the physical properties of the cryolite; and finally, performing desilicication with hydrofluoric acid, the mass concentration of which is 4%, toobtain a qualified cryolite product. Verified by large-scaled industrial production, the cryolite synthetic process provided by the invention can be implemented and realized by means of equipment inthe prior art.

Description

technical field [0001] The invention relates to a method for synthesizing cryolite with tetrafluoroaluminum sodium. It belongs to the field of inorganic fluorine chemical industry. Background technique [0002] Cryolite is mainly used in electrolytic aluminum industry. Since the reform and opening up, my country's electrolytic aluminum industry has made great progress, especially after 2002, the electrolytic aluminum industry has shown a trend of rapid development, and the number of electrolytic aluminum production enterprises has increased to nearly 150. By 2009, my country's electrolytic aluminum production capacity has reached 19.5 million tons, and the actual annual output has also reached 13 million tons. It takes about 10-12kg of cryolite to produce one ton of electrolytic aluminum. Therefore, the annual demand for cryolite in the electrolytic aluminum industry is about 130,000 tons. In various electrolytic aluminum plants in my country, low molecular ratio cryolit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54
CPCC01F7/54C01P2006/10
Inventor 刘泽君
Owner 达州励志环保科技有限公司