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Minerals 2017, 7(1), 2; doi:10.3390/min7010002

A Comparative Study on the Effect of Flotation Reagents on Growth and Iron Oxidation Activities of Leptospirillum ferrooxidans and Acidithiobacillus ferrooxidans

1
School of Mining Engineering, University of Tehran, Tehran 16846-13114, Iran
2
Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA
*
Author to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 19 November 2016 / Revised: 14 December 2016 / Accepted: 26 December 2016 / Published: 30 December 2016
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Abstract

Recently, extraction of metals from different resources using a simple, efficient, and low-cost technique-known as bioleaching-has been widely considered, and has turned out to be an important global technology. Leptospirillum ferrooxidans and Acidithiobacillus (Thiobacillus) ferrooxidans are ubiquitous bacteria in the biomining industry. To date, the effects of commercial flotation reagents on the biooxidation activities of these bacteria have not been thoroughly studied. This investigation, by using various systematic measurement methods, studied the effects of various collectors and frothers (collectors: potassium amylxanthate, potassium isobutyl-xanthate, sodium ethylxanthate, potassium isopropylxanthate, and dithiophosphate; and frothers: pine oil and methyl isobutyl carbinol) on L. ferrooxidans and A. ferrooxidans activities. In general, results indicate that in the presence of these collectors and frothers, L. ferrooxidans is less sensitive than T. ferrooxidans. In addition, the inhibition effect of collectors on both bacteria is recommended in the following order: for the collectors, potassium isobutyl-xanthate > dithiophosphate > sodium ethylxanthate > potassium isobutyl-xanthate > potassium amylxanthate; and for the frothers, methyl isobutyl carbinol > pine oil. These results can be used for the optimization of biometallurgical processes or in the early stage of a process design for selection of flotation reagents. View Full-Text
Keywords: flotation; collector; frother; bioleaching; Leptospirillum; Acidithiobacillus (Thiobacillus) ferrooxidans flotation; collector; frother; bioleaching; Leptospirillum; Acidithiobacillus (Thiobacillus) ferrooxidans
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Jafari, M.; Shafaei, S.Z.A.; Abdollahi, H.; Gharabaghi, M.; Chehreh Chelgani, S. A Comparative Study on the Effect of Flotation Reagents on Growth and Iron Oxidation Activities of Leptospirillum ferrooxidans and Acidithiobacillus ferrooxidans. Minerals 2017, 7, 2.

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