Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency

Ravindra Pogaku, and Bharathi K. Kodli, and V. Prasarnth Raaj Veera Rao, (2015) Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency. Advances in Bioprocess Technology. pp. 17-26.

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Abstract

Studies were carried out on ferrous oxidation and bacterial leaching of copper flotation concentrate to selectively leach nickel by two strains of Acidothiobacillus ferrooxidans. However, slower growth rates of these strains have led to prolonged lag periods during leaching process with low nickel recovery. Hence, attempts were made to adapt these strains to high concentrations of copper salt, nickel salt, mixture of copper and nickel salts and flotation concentrate which would facilitate the preferential leaching of Ni containing pentlandite phase from a floatation concentrate with chalcopyrite phase in predominance. When unadapted strains of Tf were replaced with adapted strains, the lag period during leaching process was drastically declined with immediate resurgence of pH fall indicating biologically produced acid. Cells adapted to metals and concentrate has shown positive effect on oxidizing ability of pyrite and nickel leaching efficiency. Unadapted Tf-44 and Tf-231 strains have shown selective leaching of nickel (55% and 49.7%) while the leachabilities obtained with adapted strains were 80% and 83.5% respectively.

Item Type: Book Chapter
Uncontrolled Keywords: Acidothiobacillus ferrooxidans , Bacterial leaching , Copper flotation , Ferrous oxidation , Leaching process , Nickel leaching , Oxidizing ability , Selective leaching
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: FACULTY > Faculty of Engineering
Depositing User: Noraini
Date Deposited: 20 Jun 2018 00:25
Last Modified: 20 Jun 2018 00:25
URI: http://eprints.ums.edu.my/id/eprint/20196

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