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Open AccessFeature PaperArticle

Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures

1
School of Mining Engineering, College of Engineering, University of Tehran, Tehran 16846-13114, Iran
2
Software Engineering Lab, University of Mons, 3000 Mons, Belgium
3
Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
*
Authors to whom correspondence should be addressed.
Processes 2019, 7(10), 653; https://doi.org/10.3390/pr7100653
Received: 1 September 2019 / Revised: 20 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Bioprocess Monitoring and Control)
Bioleaching is an environment-friendly and low-investment process for the extraction of metals from flotation concentrate. Surfactants such as collectors and frothers are widely used in the flotation process. These chemical reagents may have inhibitory effects on the activity of microorganisms through a bioleaching process; however, there is no report indicating influences of reagents on the activity of microorganisms in the mixed culture which is mostly used in the industry. In this investigation, influences of typical flotation frothers (methyl isobutyl carbinol and pine oil) in different concentrations (0.01, 0.10, and 1.00 g/L) were examined on activates of bacteria in the mesophilic mixed culture (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans, and Acidithiobacillus thiooxidans). For comparison purposes, experiments were repeated by pure cultures of Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans in the same conditions. Results indicated that increasing the dosage of frothers has a negative correlation with bacteria activities while the mixed culture showed a lower sensitivity to the toxicity of these frothers in comparison with examined pure cultures. Outcomes showed the toxicity of Pine oil is lower than methyl isobutyl carbinol (MIBC). These results can be used for designing flotation separation procedures and to produce cleaner products for bio extraction of metals. View Full-Text
Keywords: flotation; bioleaching; frother; mixed culture; machine learning flotation; bioleaching; frother; mixed culture; machine learning
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MDPI and ACS Style

Jafari, M.; Golzadeh, M.; Shafaei, S.Z.; Abdollahi, H.; Gharabaghi, M.; Chehreh Chelgani, S. Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures. Processes 2019, 7, 653.

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