Method for recycling secondary aluminum dross

By treating secondary aluminum ash with alkali leaching and carbonization, the efficient resource utilization of aluminum and nitrogen is achieved, solving the problems of low aluminum resource recovery rate and unutilized nitrogen resources in secondary aluminum ash, and providing a resource utilization method suitable for industrial application.

CN122254540APending Publication Date: 2026-06-23INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies are unable to efficiently recover aluminum resources from secondary aluminum ash and simultaneously recover nitrogen resources under mild conditions, resulting in environmental pollution and resource waste, as well as high energy consumption, making it difficult to achieve industrial application.

Method used

The secondary aluminum ash is converted into aluminate mother liquor and ammonia-containing gas by alkaline leaching, and ammonium bicarbonate solution is prepared by carbonization, realizing the cascade recovery of aluminum. The inactive aluminum is used in high-alumina refractory materials, and nitrogen resources are converted into ammonium bicarbonate products.

Benefits of technology

It achieves a high-efficiency cascade recovery rate (over 94.0%) of aluminum resources and a high recovery rate (over 90.0%) of nitrogen resources in secondary aluminum ash, reducing energy consumption and equipment requirements, and is suitable for large-scale industrial applications.

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Abstract

The application relates to a method for recycling secondary aluminum ash, which comprises the following steps: obtaining an aluminum-containing suspension and a first ammonia-containing gas by alkali leaching of the secondary aluminum ash; obtaining an aluminum-containing solid phase and a met-aluminate mother liquor by solid-liquid separation of the aluminum-containing suspension; obtaining an ammonium bicarbonate solution by first cooling and first carbonization of the first ammonia-containing gas; and mixing the met-aluminate mother liquor and the ammonium bicarbonate solution to prepare aluminum hydroxide. The method solves the pollution problem of the secondary aluminum ash, realizes efficient recovery of aluminum resources in the secondary aluminum ash, preferably has a recovery rate of active aluminum of more than 94.0%, and preferably has a total recovery rate of aluminum of more than 97.5%. The method realizes safe treatment and resource utilization of the secondary aluminum ash, and has the advantages of mild conditions, simple operation and easy industrial large-scale application.
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Citation Information

Patent Citations

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