Processing of Low-Quality Gibbsite-Kaolinite Bauxites


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Dyussenova S., Abdulvaliyev R., Akcil A., Gladyshev S., Ruzakhunova G.

Metals, vol.12, no.6, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 6
  • Publication Date: 2022
  • Doi Number: 10.3390/met12061030
  • Journal Name: Metals
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Keywords: bauxite, chemical activation, leaching, roasting, silica module
  • Süleyman Demirel University Affiliated: Yes

Abstract

© 2022 by the authors. Licensee MDPI, Basel, Switzerland.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%.