Oxidation of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flasks


Autoria(s): Bevilaqua, D.; Leite, ALLC; Garcia, O.; Tuovinen, O. H.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

02/12/2002

Resumo

Chalcopyrite oxidation was evaluated with two acidophilic thiobacilli that are important in bioleaching processes. Acidithiobacillus thiooxidans in pure culture did not oxidize CuFeS2 but oxidized externally added S in the presence of CuFeS2. Acidithiobacillus ferrooxidans released Cu2+ and soluble Fe from chalcopyrite, and the time course lead to a gradual passivation of chalcopyrite whereby Cu2+ dissolution leveled off. Fe3+ acted as a chemical oxidant in CuFeS2 leaching and was reduced to Fe2+. Parallel bacterial re-oxidation of Fe2+ contributed to a high Fe3+/Fe2+ ratio and an increase in redox potential. Chemical oxidation of chalcopyrite was slow compared with A. ferrooxidans-initiated solubilization. X-ray analysis revealed new solid phases: (i) jarosite, found in solids from A. ferrooxidans cultures and in chemical controls that initially received Fe2+ or Fe3+, and (ii) S-0, found mostly in iron-amended A. ferrooxidans culture and the corresponding chemical controls. (C) 2002 Elsevier B.V. Ltd. All rights reserved.

Formato

587-592

Identificador

http://dx.doi.org/10.1016/S0032-9592(02)00169-3

Process Biochemistry. Oxford: Elsevier B.V., v. 38, n. 4, p. 587-592, 2002.

1359-5113

http://hdl.handle.net/11449/33623

10.1016/S0032-9592(02)00169-3

WOS:000179438000015

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Process Biochemistry

Direitos

closedAccess

Palavras-Chave #Acidithiobacillus #chalcopyrite leaching #iron oxidation #sulphur oxidation
Tipo

info:eu-repo/semantics/article