5th International Conference on Recent Advances in Materials, Minerals and Environment (RAMM) & 2nd International Postgraduate Conference on Materials, Mineral and Polymer (MAMIP), 4-6 August 2015 Bioflotation: Bacteria-Mineral Interaction for Eco-friendly and Sustainable Mineral Processing

Sanwani, Edy and Chaerun, SitiKhodijah and Mirahati, RiriaZendy and Wahyuningsih, Tri (2016) 5th International Conference on Recent Advances in Materials, Minerals and Environment (RAMM) & 2nd International Postgraduate Conference on Materials, Mineral and Polymer (MAMIP), 4-6 August 2015 Bioflotation: Bacteria-Mineral Interaction for Eco-friendly and Sustainable Mineral Processing. Procedia Chemistry. pp. 666-672.

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Abstract

In the current study, the action of two bacteria capable of producing biosurfactants and oxidizing iron (Fe) and sulfur (S), namely
Bacillus pumilus SKC-2 and Alicyclobacillus ferrooxydans SKC/SAA-2, was investigated with respect to their ability in possessing
dual-function as either bio-collector or depressant for the development of sulfide bioflotation processes. Both bacterial strains were
able to produce high amounts of biosurfactants interacted with pyrite that had an important role in their adhesion on the surface of
pyrite as well as the change of pyrite surface properties. Over the course of the experiments, the pH of the solutions gradually
decreased to ~3, indicating the active oxidation of pyrite minerals by bacteria. The growth of both bacterial strains resulted in the
generation of biosurfactants as represented by the decrease of the surface tension of the solutions and the increase of the contact
angle of the pyrite surfaces as a function of time. However, the contact angle of pyrite surfaces gradually decreased after 5 days of
incubation until the experiments terminated on 30 days. Scanning electron microscopy equipped with energy dispersive X-ray
spectroscopy (SEM-EDS) and Fourier transform Infrared (FTIR) analyses also confirmed the role of both bacterial strains in
changing the pyrite surface properties to be more hydrophobic or more hydrophilic depending on the time of incubation. These
results indicate that the changes of pyrite surface properties are clearly as the results of bacterial action, likely serving as both biocollector or bio-frother and depressant that would be very applicable for flotation processes. These results increase our knowledge
on the interactions in pyrite-bacteria complexes and could potentially be a very useful result with real exploitable value for those
working on sulfide bioflotation processes.
Keywords: Biosurfactant; S-Fe-oxidizing bacteria; Bioflotation

Item Type:	Article
Uncontrolled Keywords:	Biosurfactant; S-Fe-oxidizing bacteria; Bioflotation
Subjek:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Fakultas Teknologi Mineral dan Energi > Teknik Metalurgi (S1)
Depositing User:	ST.,MT. Riria Zendy Mirahati
Date Deposited:	15 Jul 2025 01:54
Last Modified:	15 Jul 2025 01:56
URI:	http://eprints.upnyk.ac.id/id/eprint/43088

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