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Some microbiological aspects of bauxite mineralization and beneficiation

Natarajan, KA and Modak, JM and Anand, P (1997) Some microbiological aspects of bauxite mineralization and beneficiation. In: Minerals and Metallurgical Processing, 14 (2). pp. 47-53.

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A microbial survey of Jamnagar bauxite mines in Gujarat, India, revealed the indigenous presence of a variety of autotrophic and heterotrophic bacteria and fungi associated with the ore body and water ponds in the vicinity. Among these, bacteria belonging to the genera Thiobacillus, Bacillus and Pseudomonas are implicated in the weathering of aluminosilicates; the precipitation of iron oxyhydroxides; the dissolution and conversion of alkaline metal species; and the formation of alumina, silica and calcite minerals. Fungi belonging to the genus Cladosporium can reduce ferric iron and dissolve alumina silicates. Biogenesis thus plays a significant role in bauxite mineralization. Various types of bacteria and fungi, such as Bacillus polymyxa, Bacillus coagulans and Aspergillus niger, were found to be efficient in significant calcium solubilization and partial iron removal from bauxite ore. Probable mechanisms in the biobeneficiation process are analyzed. Biobeneficiation is shown to be an effective technique for the removal of iron and calcium from bauxite ores for use in refractories and ceramics.

Item Type: Journal Article
Publication: Minerals and Metallurgical Processing
Publisher: Society for Mining, Metallurgy & Exploration
Additional Information: Copyright of this article belongs to Society for Mining, Metallurgy & Exploration.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 24 Jun 2011 09:22
Last Modified: 24 Jun 2011 09:22
URI: http://eprints.iisc.ac.in/id/eprint/38462

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