Processing of Low-Quality Gibbsite-Kaolinite Bauxites
Dyussenova S. Abdulvaliyev R. Akcil A. Gladyshev S. Ruzakhunova G.
June 2022MDPI
Metals
2022#12Issue 6
The results of studies on the processing of gibbsite-kaolinite bauxite are presented. The developed technology includes preliminary chemical activation and thermal transformation during enrichment to obtain a concentrate suitable for processing by the Bayer method. As a result of the chemical activation of gibbsite-kaolinite bauxite in a solution of sodium bicarbonate, a change in the phase composition occurs, which made it possible to improve the results of gravity enrichment with the production of a coarse-grained gibbsite fraction. The transformation of bauxite in the temperature range of 900–1000◦C is explained by the decomposition reactions of siderite, gibbsite, kaolinite, calcite, dolomite and sodium ferro-sulfide oxide, as well as the formation of sodium aluminosilicate, hematite, quartz and the chemically stable phase of corundum. The optimum firing temperature of bauxite is 950◦C, after which, as a result of alkaline treatment during chemical enrichment, the extraction of SiO2 into solution was 74.9%. A silicon modulus of enriched bauxite 10.9 units was obtained. As a result of the autoclave leaching of gibbsite-kaolinite bauxite after a two-stage enrichment, the maximum extraction of alumina into solution was 87.4%. The yield of red mud during the processing of bauxite enriched and calcined at 950◦C was 37.62%. During the autoclave leaching of bauxite without enrichment, the yield of red mud was 71%.
bauxite , chemical activation , leaching , roasting , silica module
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Institute of Metallurgy and Ore Beneficiation JSC, Satbayev University, Almaty, 050010, Kazakhstan
Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, Isparta, TR32260, Turkey
Institute of Metallurgy and Ore Beneficiation JSC
Mineral-Metal Recovery and Recycling (MMR&R) Research Group
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