Waste aluminum electrolyte resource utilization method

By reacting the waste aluminum electrolyte with anhydrous aluminum chloride and polymer aluminum chloride in a closed container, a three-phase coexistence system is formed, which solves the problems of slow reaction rate and low conversion efficiency, and achieves efficient fluorine and aluminum element recycling and resource recycling.

CN119706901APending Publication Date: 2025-03-28ZHENGZHOU UNIV
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Patent Information

Application Number
CN202411927915.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the existing waste aluminum electrolyte resource utilization methods, the reaction rate and the conversion efficiency of aluminum fluoride are low, resulting in reduced resource utilization and waste of resources.

Method used

Anhydrous aluminum chloride and polymer aluminum chloride are used as reactants and waste aluminum electrolyte in a closed container, with the reaction temperature not less than 200℃ to form a solid-phase-liquid-phase three-phase coexistence system to improve the reaction rate and conversion rate.

Benefits of technology

It has achieved efficient resource recycling of valuable elements such as fluorine and aluminum. The obtained aluminum fluoride product has a high effective content and can be directly returned to the aluminum electrolytic cell. The process flow is short and the energy consumption is low, and it has significant economic and social benefits.

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Abstract

The invention relates to the technical field of aluminum electrolyte recovery, in particular to a waste aluminum electrolyte resource utilization method. The waste aluminum electrolyte resource utilization method comprises the following steps that waste aluminum electrolyte and a reactant are subjected to a reaction in a closed container, a product obtained after the reaction is completed is washed in water, then first solid-liquid separation is carried out to obtain a solid, aluminum fluoride is obtained after drying, and aluminum fluoride is obtained after second solid-liquid separation is carried out. The reactant is selected from one or two of anhydrous aluminum chloride and polyaluminum chloride, and the reaction temperature is not lower than 200 DEG C. By utilizing the physical characteristic that the melting point of the reactant is higher than the boiling point, the reactant forms a solid phase-liquid phase-gas phase three-phase coexistence system in a closed space at the temperature higher than the melting point and the boiling point, so that the reactant can more efficiently perform molecular collision and mutual diffusion at an interface, thereby accelerating the reaction rate and improving the conversion rate.
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