Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency
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 r...
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Springer International Publishing
2015
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| Online Access: | https://eprints.ums.edu.my/id/eprint/20196/1/Effect%20of%20adaptation%20of%20acidothiobacillus%20ferrooxidans%20on%20ferrous%20oxidation%20and%20nickel%20leaching%20efficiency.pdf https://eprints.ums.edu.my/id/eprint/20196/ https://doi.org/10.1007/978-3-319-17915-5_2 |
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| author | Ravindra Pogaku Bharathi K. Kodli V. Prasarnth Raaj Veera Rao |
| author_facet | Ravindra Pogaku Bharathi K. Kodli V. Prasarnth Raaj Veera Rao |
| author_sort | Ravindra Pogaku |
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| content_provider | Universiti Malaysia Sabah |
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| continent | Asia |
| country | Malaysia |
| description | 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. |
| format | Chapter In Book |
| id | my.ums.eprints-20196 |
| institution | Universiti Malaysia Sabah |
| language | en |
| publishDate | 2015 |
| publisher | Springer International Publishing |
| record_format | eprints |
| spelling | my.ums.eprints-201962018-06-20T00:25:14Z https://eprints.ums.edu.my/id/eprint/20196/ Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency Ravindra Pogaku Bharathi K. Kodli V. Prasarnth Raaj Veera Rao TN Mining engineering. Metallurgy 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. Springer International Publishing 2015 Chapter In Book NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/20196/1/Effect%20of%20adaptation%20of%20acidothiobacillus%20ferrooxidans%20on%20ferrous%20oxidation%20and%20nickel%20leaching%20efficiency.pdf 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. https://doi.org/10.1007/978-3-319-17915-5_2 |
| spellingShingle | TN Mining engineering. Metallurgy Ravindra Pogaku Bharathi K. Kodli V. Prasarnth Raaj Veera Rao Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title | Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title_full | Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title_fullStr | Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title_full_unstemmed | Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title_short | Effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| title_sort | effect of adaptation of acidothiobacillus ferrooxidans on ferrous oxidation and nickel leaching efficiency |
| topic | TN Mining engineering. Metallurgy |
| url | https://eprints.ums.edu.my/id/eprint/20196/1/Effect%20of%20adaptation%20of%20acidothiobacillus%20ferrooxidans%20on%20ferrous%20oxidation%20and%20nickel%20leaching%20efficiency.pdf https://eprints.ums.edu.my/id/eprint/20196/ https://doi.org/10.1007/978-3-319-17915-5_2 |
| url_provider | http://eprints.ums.edu.my/ |