Method for comprehensively utilizing aluminum electrolysis waste

Through the method of combining chemical reactions and electrochemical separation, various valuable components in aluminum electrolytic waste are efficiently recovered, solving the problems of low recycling efficiency and serious environmental pollution in the prior art, and achieving efficient utilization of resources and environmental sustainability.

CN119706900APending Publication Date: 2025-03-28XIAN JINZANG MEMBRANE ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202411910266.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, aluminum electrolytic waste has low recycling efficiency, serious environmental pollution, and incomplete treatment, resulting in waste of resources and environmental pollution.

Method used

A mixed solution containing sodium metametaluminate, sodium fluoride and sodium hydroxide was generated by pulverizing and reacting with alkali solution. After multiple washing and evaporation, the pH value was adjusted using carbon dioxide to separate high-purity aluminum hydroxide and sodium carbonate solutions, and the hydrogen fluoride/ammonium fluoride and sodium hydroxide/sodium carbonate/sodium bicarbonate solutions were further separated by electrochemical methods, and finally high-purity lithium carbonate and aluminum fluoride were prepared.

Benefits of technology

It realizes efficient recycling of various valuable components in aluminum electrolytic waste, improves resource utilization, reduces environmental pollution, reduces treatment costs, and improves recycling efficiency.

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Abstract

The invention belongs to the technical field of aluminum electrolysis waste recovery treatment, and particularly relates to a comprehensive utilization method for aluminum electrolysis waste. The method comprises the following steps: after crushing the aluminum electrolysis waste, reacting the crushed aluminum electrolysis waste with an alkaline solution to generate a mixed solution containing a sodium metaaluminate component and filter residues A; washing the filter residue A for multiple times, and extracting a sodium fluoride saturated solution and a filter residue B; heating and evaporating the mixed solution to separate out sodium fluoride; the pH value of the solution is adjusted through carbon dioxide, and a high-purity aluminum hydroxide and sodium carbonate solution is prepared; separating the washed mixed solution by adopting an electrochemical method to obtain a hydrogen fluoride / ammonium fluoride solution and a sodium hydroxide / sodium carbonate / sodium bicarbonate solution; reacting the filter residue B with dilute acid to prepare a lithium-containing solution, purifying and concentrating, adding sodium carbonate to precipitate lithium to prepare a lithium carbonate product, and reacting aluminum hydroxide with hydrogen fluoride to prepare high-purity aluminum fluoride. According to the method, comprehensive recovery of the aluminum electrolysis waste is achieved, environmental pollution is effectively reduced, and the utilization rate of resources is increased.
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