Bio-chemical leaching of kaolinite-hematite-boehmite type bauxite ore

Gurevich, Y L and Teremova, M I and Bondarenko, G N and Kislan, S L and Abhilash, (2015) Bio-chemical leaching of kaolinite-hematite-boehmite type bauxite ore. Indian Journal of Chemical Technology, 22/5 (IF-0.655). pp. 248-252.

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Low grade bauxites of Severo-Onezhsky and Sredne-Timansky deposits of Russia have been evaluated for their amenability towards bioleaching. Two microbial isolates of Bacillus genera have been isolated in Zak medium and enriched to conduct leaching experiments of bauxites. The bacteria are chosen due their specific ability to secrete exo-polysaachrides (EPS), which is believed to be very beneficial in dissolution-cum-flocculation of aluminosilicates. The microbes have been able to leach nearly 50% alumina and nearly 10-35% SiO2 and Fe2O3. Chemical leaching experiments with citric and oxalic acids on bauxite leaching result in a maximum extraction of aluminum to be nearly 39% at elevated concentrations of leaching agents and 2-8 hours residence time.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Bioleaching; Bauxite; Microbial EPS; Specificity; Alumina
Divisions:Metal Extraction and Forming
ID Code:7375
Deposited By:Dr. Abhilash .
Deposited On:31 Dec 2015 10:28
Last Modified:31 Dec 2015 10:28
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