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

Document identifier: oai:DiVA.org:ltu-76781
Access full text here:10.3390/pr7100653
Keyword: Engineering and Technology, Materials Engineering, Metallurgy and Metallic Materials, Teknik och teknologier, Materialteknik, Metallurgi och metalliska material, Flotation, Bioleaching, Frother, Mixed culture, Machine learning, Mineral Processing, Mineralteknik
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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.

Authors

Mohammad Jafari

School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Mehdi Golzadeh

Software Engineering Lab, University of Mons, Mons, Belgium
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Sied Ziaedin Shafaei

School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Hadi Abdollahi

School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Mahdi Gharabaghi

School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Saeed Chehreh Chelgani

Luleå tekniska universitet; Mineralteknik och metallurgi
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