Method for treating red mud

CN122189334APending Publication Date: 2026-06-12BAISE UNIV

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: BAISE UNIV
Filing Date: 2026-04-16
Publication Date: 2026-06-12

AI Technical Summary

⚠Technical Problem

Existing Bayer process red mud treatment technologies suffer from high operating costs, poor integration with existing alumina production lines, uncoordinated recovery of valuable components, ineffective utilization of iron, and insufficient economic feasibility, making it difficult to achieve large-scale industrialization of red mud treatment.

⚗Method used

Iron concentrate is separated from red mud by strong magnetic separation. Sodium ferrite is prepared by using sodium carbonate, a byproduct of the Bayer process. Combined with the phase transformation characteristics of hydrated garnet, the hydrated grossular garnet in red mud is promoted to transform into hydrated gradium garnet under alkaline hydrothermal conditions, releasing Al2O3 and Na2O into the solution. The solution is then dissolved in the existing alumina production system to achieve the synergistic recovery of iron, aluminum and sodium.

🎯Benefits of technology

It achieves efficient recovery of iron, aluminum, and sodium from red mud, reduces operating costs and fixed asset investment, and seamlessly integrates with existing alumina production lines, thereby improving the economic feasibility and resource utilization rate of red mud treatment.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method for treating red mud. It belongs to the field of industrial waste recycling. Method: the Bayer process red mud is subjected to strong magnetic separation to obtain iron concentrate and primary magnetic separation tailings; the iron concentrate is mixed with sodium carbonate and sintered to prepare sodium ferrite; the sodium ferrite is mixed with the Bayer process red mud and added to the Bayer process leaching system for leaching to obtain a slurry; the slurry liquid is subjected to solid separation to obtain a sodium aluminate-rich solution and a sodium- and aluminum-removed residue; the sodium- and aluminum-removed residue is subjected to secondary strong magnetic separation to obtain regenerated iron concentrate and final tailings. The present application has the beneficial effects of: realizing precise matching of leaching temperature and bauxite type, saving energy and reducing consumption; optimizing the conversion conditions of hydrated calcium aluminum garnet to hydrated calcium iron garnet, improving the sodium- and aluminum-removal efficiency; under high-temperature working conditions of 260-280 DEG C, the Al2O3 extraction rate can reach more than 78%, and the Na2O extraction rate can reach more than 93%; seamlessly connecting with the existing Bayer process production line, without the need to add new leaching equipment; expanding the process application range, covering all types of bauxite.

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