A method for refining secondary aluminum by sintering dust collection material with aluminum ash

By controlling the rotary kiln temperature and rotation speed in stages, and using aluminum ash sintering dust as a refining agent, the problem of removing alumina inclusions was solved, achieving efficient purification of molten aluminum and cost reduction, which is suitable for aluminum alloy production.

CN122445949APending Publication Date: 2026-07-24KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-01
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, the alumina inclusions in the aluminum ash sintering dust collection material cannot be effectively removed, which makes it impossible to use it directly for aluminum melt refining, affecting the purity of aluminum liquid and metal recovery rate. In addition, traditional refining agents are costly and have poor stability.

Method used

By adopting a segmented control method for rotary kiln temperature and rotation stirring speed, and using aluminum ash sintering dust, sodium chloride and calcium fluoride as refining agents, hydrogen and oxide inclusions in the aluminum melt are adsorbed and removed through melting coverage and chemical reaction, and the depth of aluminum liquid is controlled to shorten the floating journey of alumina particles.

Benefits of technology

It has achieved a 5% to 12% increase in the recovery rate of recycled aluminum metal, a 55% to 68% removal rate of hydrogen content and oxide inclusions, meeting the requirements for casting-grade aluminum alloy production, and reducing the cost of refining agents by 30% to 60%.

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Abstract

The application provides a method for refining recycled aluminum by using aluminum ash sintered dust collection material, and belongs to the technical field of non-ferrous metallurgy and resource comprehensive utilization. The refining agent and recycled aluminum smelting raw material are smelted in a rotary kiln to obtain refined aluminum liquid. By controlling the content of each component in the refining agent, the depth of the aluminum liquid and the staged stirring and temperature rising, the alumina particles in the aluminum ash sintered dust collection material are fully collided and coalesced, and quickly float and concentrate on the surface of the melt or be discharged with the slag phase, so that the pollution of the melt caused by the dispersion and suspension of the alumina in the deep liquid layer is avoided. The recycled aluminum metal recovery rate of the refined aluminum liquid obtained by the method is 89.5~92.2%, the hydrogen removal rate is 60~65%, and the removal rate of the oxidized inclusions is 55~68%. The hydrogen removal rate and the removal rate of the oxidized inclusions both meet the production requirements of the casting grade aluminum alloy.
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