Method for synergistically recovering valuable elements from overhaul slag and chromium-containing aluminum sludge

CA3321848A1Pending Publication Date: 2026-09-21ZHENGZHOU NON-FERROUS METALS RESEARCH INSTITUTE CO LTD OF CHINALCO +1
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Patent Information

Application Number
CA3321848
Authority / Receiving Office
CA · CA
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-12-09
Filing Date
2025-12-09
Publication Date
2026-09-21

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively recover valuable elements such as chromium, aluminum, and iron from the overhaul slag of electrolytic aluminum cells and chromium-containing aluminum sludge, and direct dumping or landfilling will harm the environment.

Method used

The valuable elements are obtained by redox reaction of mixed inorganic acid with chromium-containing aluminum mud and overhaul slag, followed by precipitation reaction using alkaline components, chlorination reaction using preheated silicon tetrachloride, separation and purification, and finally washing to obtain trivalent chromium solution.

Benefits of technology

It achieves the harmless treatment of toxic elements, improves the recovery rate of valuable elements, and produces harmless or low-toxicity byproducts that meet environmental protection requirements.

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Abstract

The present disclosure provides a method for synergistically recovering valuable elements from overhaul slag and chromium-containing aluminum sludge, including: mixing an inorganic acid, the chromium-containing aluminum sludge, and the overhaul slag to obtain a decyanated material; subjecting the decyanated material to a precipitation reaction by using an alkaline component to obtain a precipitated material; mixing a first preheated silicon tetrachloride with the precipitated material to obtain a first chlorination flue gas and a first chromium-containing chlorination residue; mixing a second preheated silicon tetrachloride with the first chromium-containing chlorination residue to obtain a second chlorination flue gas and a second chromium-containing chlorination residue; separating and purifying the first chlorination flue gas and the second chlorination flue gas respectively, to obtain an aluminum-containing solid phase, an iron-containing solid phase, and silicon tetrafluoride; and washing the second chromium-containing chlorination residue to obtain a solution containing trivalent chromium.
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