Overcoming the Bacteriostatic Effects of Heavy Metals on A. thiooxidans Direct Bioleaching of Saprolitic Ni Laterite Ores

Hee Chan Jang; Marjorie Valix

doi:10.4028/www.scientific.net/AMR.1130.263

Paper Titles

Comparative Experiments on Acid Leaching and Bioleaching to a Sandstone Type Uranium Ore
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Utilization of Metabolic Citric Acid from Aspergillus niger Using Corn Starch in the Nickel Leaching of Indonesian Saprolitic Ore
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Development of a Strategy for Selective Metal Recovery from Pregnant Leach Solutions of Kupferschiefer Bioleaching
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Interactions between Chalcopyrite and Marmatite during Bioleaching Process
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Overcoming the Bacteriostatic Effects of Heavy Metals on A. thiooxidans Direct Bioleaching of Saprolitic Ni Laterite Ores
p.263

An In Situ Characterization for the Bioleaching Process of Natural Pyrite Using Electrochemical Noise Technique
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Organic Acid Biogeneration by Aspergillus niger and its Utilization for Indirect Bioleaching of Nickel Laterite Ore
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Influence of Carbonate Solubilisation on Copper Leaching from Kupferschiefer with Organic Acids
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Evolution of Leaching Products on the Surface of Chalcopyrite by Mesophiles and Thermophiles Based on SR-XRD and XANES Spectroscopy
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1130Overcoming the Bacteriostatic Effects of Heavy...

Overcoming the Bacteriostatic Effects of Heavy Metals on A. thiooxidans Direct Bioleaching of Saprolitic Ni Laterite Ores

Abstract:

In this study, the adaptation of A. thiooxidans to heavy metals leached from saprolitic Ni laterite ores was performed by gradual acclimatisation. The bacteria was cultivated in heavy metals (Ni, Co, Fe, Mg, Cr and Mn) with total concentrations of 2400 to 24000 ppm equivalent to total dissolution of 1 to 10% (w/v) pulp densities of the saprolitic Ni laterite ore. Adaptation evolution mapped from its tolerance index was found to be dependent on metal concentration, acid generation, and period of adaptation. Bio-stimulation of cell growth and acid production was promoted by heavy metal stress on the bacteria. Pre-established heavy metal tolerance of the bacteria improved the leaching rate in its early phase; 20% and 7% increase in Ni and Co metal recoveries were observed in using adapted bacteria. However heavy metal tolerance was also achieved by the bacteria during the leaching process, albeit delayed by a lag phase. These results confirm the robust nature and suitability of A. thiooxidans in direct biomining of Ni ores.

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Periodical:

Advanced Materials Research (Volume 1130)

Pages:

263-267

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1130.263

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Online since:

November 2015

Authors:

Hee Chan Jang, Marjorie Valix*

Keywords:

Acidithiobacillus, Acidophiles, Bioleaching, Laterite, Nickel

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References

[1] D.B. Johnson: Transactions of Nonferrous Metals Society of China, (2008) Vol 18, 1367-1373.

Google Scholar

[2] H.M. Li, J.J. Ke: Hydrometallurgy, (2001) Vol 61, 151-156.

Google Scholar

[3] H.R. Watling: Hydrometallurgy, (2008) Vol 91, 70-88.

Google Scholar

[4] M. Valix, L.O. Loon: Minerals Engineering, (2003) Vol 16, 193-198.

Google Scholar

[5] P. Castiglioni, D. Warner, R.J. Bensen, D.C. Anstrom, J. Harrison, M. Stoecker, M. Abad, G. Kumar, S. Salvador, R. D'Ordine, S. Navarro, S. Back, M. Fernandes, J. Targolli, S. Dasgupta, C. Bonin, M.H. Luethy, J.E. Heard: Plant Physiology, (2008).

DOI: 10.1104/pp.108.118828

Google Scholar

[6] T. Maeda, A. Negishi, Y. Nogami, T. Sugio: Bioscience Biotechnology and Biochemistry, (1996) Vol 60, 626-629.

DOI: 10.1271/bbb.60.626

Google Scholar

[7] Y. Nogami, T. Maeda, A. Negishi, T. Sugio: Bioscience Biotechnology and Biochemistry, (1997) Vol 61, 1373-1375.

DOI: 10.1271/bbb.61.1373

Google Scholar