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Microbially induced flotation of alumina, silica/calcite from haematite

Sarvamangala, H and Natarajan, KA (2011) Microbially induced flotation of alumina, silica/calcite from haematite. In: International Journal of Mineral Processing, 99 (1-4). pp. 70-77.

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Official URL: http://dx.doi.org/10.1016/j.minpro.2011.04.003

Abstract

Selective separation of haematite from alumina and silica/calcite was achieved through microbiologically induced flotation and flocculation in presence of Bacillus subtilis. Bacterial metabolites containing extracellular proteins were characterized from mineral-grown bacterial cell free extract. Bacteria can adhere to mineral surfaces and influence subsequent flotation of the minerals. Cells and metabolic products of bacteria were used in flotation, flocculation and adsorption studies on oxide minerals. Bacteria functions as a stronger depressant for haematite. Selective affinity of the bacterial cells towards the mineral surface was observed through adsorption studies. Bacterial byproduct like extracellular protein (EP) was isolated from bacteria. The protein profile of the EP of bacterial cells grown in presence and absence of minerals (haematite, corundum, quartz and calcite) was also studied. The role of such proteins in selective mineral separation was demonstrated through microbially induced selective flotation. This study has demonstrated the utility and amenability of microbially induced mineral beneficiation through the use of bacterially generated metabolic products and mineral-grown bacterial cells. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science B.V.
Keywords: Bacillus subtilis;Mineral-grown cells;Extracellular proteins; Flotation;Flocculation;Minerals
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 18 Jul 2011 07:40
Last Modified: 18 Jul 2011 07:40
URI: http://eprints.iisc.ernet.in/id/eprint/39198

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