Method for efficiently extracting aluminum oxide from low-grade aluminum ore

By employing a process involving crushing, grinding, reverse flotation, pressurized acid leaching, and stepwise sedimentation, the problem of separating aluminum and iron in low-grade bauxite has been solved, enabling the efficient extraction of high-purity alumina while reducing costs and environmental impact.

CN121850031APending Publication Date: 2026-04-14TANGSHAN OUTSTANDING SCI & TECH
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Patent Information

Application Number
CN202610198335.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-11
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing technologies are insufficient for the efficient production of alumina from low-grade bauxite, especially due to the high silicon content leading to high alkali consumption and large amounts of waste residue, and the unresolved problem of aluminum-iron separation.

Method used

The process employs a step-by-step approach involving crushing, grinding, reverse flotation, pressure acid leaching, and precipitation of iron and aluminum. Combined with collectors and multiple reverse flotation steps, the aluminum-silicon ratio of the aluminum concentrate is increased. High-efficiency separation of aluminum and iron is achieved through pressure acid leaching and step-by-step precipitation. Finally, high-purity alumina is obtained through calcination.

Benefits of technology

It significantly reduces the cost of alumina recycling, improves the purity of alumina and the efficiency of aluminum-iron separation, reduces solid waste emissions, and achieves efficient resource utilization and environmental benefits.

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Abstract

The invention provides a method for efficiently extracting aluminum oxide from low-grade aluminum ore, and belongs to the technical field of metallurgical engineering. The method provided by the invention comprises the following steps: crushing and grinding the low-grade aluminum ore in sequence to obtain pretreated aluminum ore; the pretreated aluminum ore is mixed with water, first alkali and a collecting agent, reverse flotation is conducted, and aluminum concentrate is obtained; the aluminum concentrate is subjected to pressurized acid leaching, and a leaching solution is obtained; mixing the leachate with alkali, and carrying out first iron precipitation and second aluminum precipitation step by step to obtain aluminum hydroxide; mixing aluminum hydroxide with a second acid solution to obtain an aluminum salt solution; concentrating the aluminum salt solution, adding a seed crystal, and crystallizing to obtain aluminum salt; and calcining the aluminum salt to obtain the aluminum oxide. According to the method, the aluminum-silicon ratio of the aluminum concentrate is increased through reverse flotation pre-enrichment, the acid consumption in the subsequent pressurized acid leaching process is reduced, and the aluminum oxide recovery cost is reduced; through fractional precipitation, efficient separation of aluminum and iron is achieved, and the purity of final aluminum oxide is improved.
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