Process for directly reducing iron and separating iron and aluminum from aluminum oxide red mud

Through the double-rotary kiln fire treatment, efficient iron recovery and aluminum separation in alumina red mud are achieved, and the problems of low utilization rate of red mud resources and environmental pollution are solved, and efficient utilization of resources and reduction of waste gas are achieved.

CN120505469APending Publication Date: 2025-08-19CARBON SILVER (HEBEI XIONGAN) NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510439003.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-09
Publication Date
2025-08-19

AI Technical Summary

Technical Problem

In the prior art, the iron resource utilization rate of alumina red mud is low, and the waste gas and waste liquid generated during the treatment pollute the environment, making it difficult to achieve efficient resource utilization.

Method used

The double-rotary kiln fire method is used to treat red mud under an oxidation and reduction environment, and roast it through a gas semi-suspended oxidation kiln and a self-gravity sealed electric heating reduction kiln. Combined with CO2 capture and waste heat utilization, iron and aluminum separation is achieved and thermal energy and CO and chlorine are recovered to reduce waste gas emissions.

Benefits of technology

It realizes efficient recycling of iron and separation of aluminum in red mud, reduces waste gas emissions, improves resource utilization, and converts it into valuable products through acidification treatment, reducing energy consumption and environmental pollution.

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Abstract

The invention provides a process for directly reducing iron and separating iron and aluminum from aluminum oxide red mud, and relates to the technical field of comprehensive utilization of metallurgical solid waste such as red mud and carbon dioxide CCUS. According to the process for directly reducing iron and separating iron from aluminum by using aluminum oxide red mud, solid wastes such as red mud, secondary aluminum ash or other sodium-based additives, metallurgical slag and the like are used as raw materials, and are mixed and granulated after being reasonably matched with a catalyst. Roasting in a gas semi-suspension oxidation kiln; and the roasted material enters a self-gravity closed electric heating reduction kiln to be calcined by taking biomass as fuel. CO gas generated by calcination is used as fuel of the fuel gas semi-suspension oxidation kiln. After calcination, under the protection of excessive CO gas, the high metallization ratio of 95% or above is achieved, iron and aluminum are separated, the material cooled to about 200 DEG C is leached with water, the levigated material enters a magnetic separator, solid-liquid separation and solid-phase magnetic separation of metal iron are achieved, and titanium concentrate and slag are separated.
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