Sulphide bioxidation using native Acidithiobacillus ferrooxidans and thiooxidans, related acidophile strains from 'El Zancudo' gold mine (Titiribí, Colombia)

Autor:	Diana M Ossa H, Marco A. Márquez G.
Jazyk:	Spanish; Castilian
Rok vydání:	2007
Předmět:	chemolithotrophics arsenopirita lcsh:Biotechnology lcsh:TP248.13-248.65 quimiolitotrofos arsenopyrite bioleaching 0 pirita biolixiviación applied mineralogy pyrite mineralogía aplicada
Zdroj:	Revista Colombiana de Biotecnología, Vol 7, Iss 2, Pp 55-66 (2007)
ISSN:	1909-8758 0123-3475
Popis:	This investigation was aimed at a laboratory evaluation of the action of native Acidithiobacillus ferrooxidans-and thiooxidans-related acidophile micro-organism (isolated from El Zancudo gold mine in Titiribí, Colombia) on the oxidation of sulphides, mainly consisting of pyrite and arsenopyrite; sulphide concentration varied from 8% to 16% and particle size from 75 um to 106 um. pH and redox potential measurement revealed efficient oxidation for each culture over a 25-day period, reaching 1,4 pH and 600 mV redox potential. 20 g/L As and 60 g/L Fe levels were reached in solution. XRD, FTIR and SEM/EDX analysis revealed the presence of bacterial oxidation products such as jarosite and iron arsenates, as well as low and high corrosion in pyrites and arsenopyrites, respectively. Key words: chemolithotrophics, bioleaching, pyrite, arsenopyrite, applied mineralogy.
Databáze:	OpenAIRE
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