Panayotova, M. I. та Panayotov, V. T. (2020) RECENT DEVELOPMENTS IN THE FLOTATION OF SULFIDE ORES OF BASE METALS - BIOFLOTATION. Topical scientific researches into resource-saving technologies of mineral mining and processing. с. 130-148.

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Title in English

RECENT DEVELOPMENTS IN THE FLOTATION OF SUL-FIDE ORES OF BASE METALS - BIOFLOTATION

English abstract

Bioflotation of sulfide minerals is being developed recently at laboratory scale. Different bacterial cells, cell parts and microbial metabolites have been successfully used as reagents (mainly biodepressants and biosurfactants) to separate by flotation pyrite, sphalerite, galena, chalcopyrite, arsenopyrite, molybdenite, pyrrhotite, etc. from mixtures of those minerals or from gangue minerals, such as quartz or calcite. Influence of conditions for microorganisms’ cultivation and of operating param-eters (such as pulp density, pH and temperature, concentration of bioreagents and their nature, addition to the system of typical flotation reagents, such as xanthate or activators) has been widely studied. Changes in the system ''miner-al(s)/microorganism cells (cell parts or metabolites)'' have been investigated by vari-ous methods, such as contact angle, electro-kinetic and zeta-potential measurements, Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy (SEM-EDS) and Fourier-transform infrared (FTIR) spectroscopy, sodium dodecyl sulfate - poly-acrylamide gel electrophoresis (SDS-PAGE), etc. Different mechanisms of microbi-al action leading to minerals' surface biomodification have been raised, such as mi-crobial cells attachment, occurrence of oxidation-reduction reactions on the interface ''mineral/microorganisms'', adsorption and/or chemical reactions with microbial metabolite products. This paper briefly presents and discusses the above-mentioned issues.

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