Microbial mechanism of metal sulfide dissolution

Bioleaching process has been successfully implemented in the industrial scale for the extraction of different valuable metals like copper, gold, cobalt, and uranium. The metal dissolution from different sulphide resources in the bioleaching is performed using a great diversity of microorganisms whic...

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Bibliographic Details
Main Authors: Pattanaik, Archana, Sukla, Lala Behari, Pradhan, Debabrata, Krishna Samal, D.P.
Format: Conference Proceeding
Language:English
Subjects:
Biotechnological process
Metal dissolution
Microorganisms
Polysulfide mechanism
Thiosulfate mechanism
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Summary:Bioleaching process has been successfully implemented in the industrial scale for the extraction of different valuable metals like copper, gold, cobalt, and uranium. The metal dissolution from different sulphide resources in the bioleaching is performed using a great diversity of microorganisms which can easily grow in the mining environment. The microbial consortia of the mining habitat majorly include acidophilic chemolithotrophs and chemoorganotrophs ranging from mesophiles to extreme thermophiles. Depending upon the acid solubility of metal sulphides these microorganisms help in metal dissolution process through either the thiosulfate or polysulfide mechanism. The extracellular polymeric substances of the microorganisms play the major role in the cell adhesion and biofilm formation on the surface of minerals. In the mechanism the microorganisms objectively oxidise the iron and sulfur within their extracellular polymeric layers for the metal dissolution. The electrons generated during the oxidation reactions enter into the electron transport chain of the microorganisms for their cellular metabolism.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2020.01.615