A method for preparing anhydrous aluminum fluoride from aluminum electrolysis carbon slag waste

By adjusting the treatment process of aluminum electrolytic carbon slag waste, including acid soaking, reaction accelerator adjustment and temperature treatment, anhydrous aluminum fluoride was successfully prepared, solving the problems of low fluorine-aluminum ratio and crystallization water in the prior art, and improving the purity and stability of the product.

CN116605898BActive Publication Date: 2025-03-25ZHENGZHOU NON FERROUS METALS RES INST CO LTD OF CHALCO
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Patent Information

Application Number
CN202310471323.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-27
Publication Date
2025-03-25
Estimated Expiration
2043-04-27

AI Technical Summary

Technical Problem

The hydroxyl aluminum fluoride obtained by the existing carbon slag treatment has the problem of low fluorine-aluminum ratio and containing crystal water, which leads to strong side reactions in the dehydration and dehydroxylation process, and the resulting aluminum fluoride has a low purity.

Method used

By providing aluminum electrolytic carbon slag waste with a particle size not higher than a predetermined size, using acid liquid soaking and solid-liquid separation, adding reaction accelerator to adjust the molar ratio of fluoroaluminum elements, forming a preformed solution, and processing at a specific temperature to generate anhydrous hydroxyl aluminum fluoride, and finally obtaining anhydrous aluminum fluoride by dehydroxyl additive treatment.

Benefits of technology

The preparation of anhydrous aluminum fluoride is achieved, the existence of crystallization water is avoided, the fluorine-aluminum ratio is improved, and the purity and stability of the product are enhanced.

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Abstract

The present application relates to a method for preparing anhydrous aluminum fluoride from aluminum electrolysis carbon slag waste, comprising the following steps: providing aluminum electrolysis carbon slag waste with a particle size not higher than a predetermined size; soaking the aluminum electrolysis carbon slag waste in acid solution and then performing solid-liquid separation, collecting the separated liquid obtained by the solid-liquid separation; adding a reaction accelerator to the separated liquid, adjusting the molar ratio of fluorine and aluminum elements in the separated liquid to 3-5:1, and obtaining a prefabricated solution; treating the prefabricated solution at a first temperature to obtain anhydrous hydroxyaluminum fluoride; preparing anhydrous aluminum fluoride using the anhydrous hydroxyaluminum fluoride as a raw material, wherein the reaction accelerator includes at least one of phenylalanine, valine, leucine, kerosene, ethyl acetate, ammonium bifluoride, and sodium fluoride. The present application makes it easier to generate hydroxyaluminum fluoride that is closer to the AlF3 structure by adding a reaction accelerator, and can form a hydrophobic protective layer on the surface of hydroxyaluminum fluoride, so as not to carry crystal water.
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