Biomineralization and Biobeneficiation of Bauxite

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• 作者：K. A. Natarajan
• 关键词：Biobeneficiation ; Biomineralization ; Bauxite ; Calcium ; Iron oxides ; Silica
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：69
• 期：1
• 页码：15-21
• 全文大小：470 KB
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• 作者单位：K. A. Natarajan (1)
  
  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560 012, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

Role of indigenous microbes in the formation and conversion of bauxite minerals is illustrated. Many types of microorganisms such as fungi, heterotrophic and autotrophic bacteria and yeasts inhabit bauxite ore deposits bringing about biogenesis and biomineraliztion. Organisms capable of iron oxidation and reduction and solubilising calcium carbonate and silica can be isolated from bauxite deposits and are used to bring about selective mineral beneficiation to remove iron, calcium and silica. Use of Paenibacillus polymyxa in the efficient removal of calcium from low grade bauxites is demonstrated through bioreactor technology. Similarly, for iron removal from bauxite, iron-reducing bacteria can be used. Silicate bacteria aid in selective silica solubilisation to control alumina: silica ratios. Microorganisms can also be used to bring about environmental control with respect to red mud disposal through bioremediation technology.