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2019 | OriginalPaper | Chapter

Advances in Beneficiation of Low-Grade Bauxite

Authors: Lala Behari Sukla, Archana Pattanaik, Debabrata Pradhan

Published in: Light Metals 2019

Publisher: Springer International Publishing

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Abstract

Bauxite is the major alumina (Al2O3) bearing ore used in the aluminum manufacturing industries. The bauxite containing less than 50% Al2O3 is called low-grade bauxite ore which is commonly used for the alumina-based abrasives and refractories productions. The alumina-silica and alumina-ferrite complexes are the foremost impurities present in the low-grade bauxite. They affect its commercial utilities due to development of poor binding property in the alumina grains, which creates mechano-physical problems. Therefore, they must be removed from the low-grade bauxite. Different conventional bauxite purification or beneficiation methods have been used for their removal; however, they have several limitations. Bio-beneficiation is a potential solution to the problems associated with conventional methods. In the bio-beneficiation process, the biological agents such as microorganisms and their metabolic products can mobilize or polarize different impurities present in the low-grade bauxite by means of the active redox environment created by them in the indigenous atmosphere. Many reports have suggested that Paenibacillus polymyxa efficiently removes calcium from the low-grade bauxite. Similarly, iron-oxidizing and silicate bacteria remove iron and solubilise silica, respectively, from the low-grade bauxite. However, pilot scale operation of the bauxite bio-beneficiation process has not been reported. Research related to biotechnology should be undertaken in the future to develop a comprehensive and efficient process for the bio-beneficiation of low-grade bauxite ore.

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Metadata
Title
Advances in Beneficiation of Low-Grade Bauxite
Authors
Lala Behari Sukla
Archana Pattanaik
Debabrata Pradhan
Copyright Year
2019
DOI
https://doi.org/10.1007/978-3-030-05864-7_1

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