Bacterial and chemical leaching of chalcopyrite concentrates as affected by the redox potential and ferric/ferrous iron ratio at 22 degrees C

dc.contributorTampere Univ Technol
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorOhio State Univ
dc.creatorBevilaqua, Denise [UNESP]
dc.creatorLahti-Tommila, Heidi
dc.creatorGarcia, Oswaldo [UNESP]
dc.creatorPuhakka, Jaakko A.
dc.creatorTuovinen, Olli H.
dc.date2015-03-18T15:53:42Z
dc.date2015-03-18T15:53:42Z
dc.date2014-11-10
dc.date.accessioned2023-09-09T11:08:34Z
dc.date.available2023-09-09T11:08:34Z
dc.identifierhttp://dx.doi.org/10.1016/j.minpro.2014.08.008
dc.identifierInternational Journal Of Mineral Processing. Amsterdam: Elsevier Science Bv, v. 132, p. 1-7, 2014.
dc.identifier0301-7516
dc.identifierhttp://hdl.handle.net/11449/116668
dc.identifier10.1016/j.minpro.2014.08.008
dc.identifierWOS:000344212300001
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8766153
dc.descriptionBiological oxidation of chalcopyrite by acidophilic and mesophilic bacteria becomes hindered over time due to passivation of the surface, making the mineral relatively recalcitrant to beneficiation in bioleaching processes. Several approaches have been discussed in the literature to overcome the passivation effect. The purpose of this work was to assess the effect of redox potential and Fe3+/Fe2+ ratios on the bioleaching of chalcopyrite in shake flasks. Two mixed cultures, three pure cultures of acidophiles, and two samples of chalcopyrite concentrates were used for this study. The initial redox levels between 350 and 600 mV were adjusted with Fe2+ and Fe3+ ratios, Sigma 200 mM and Sigma 300 mM Fe, at 0.33 and 2.5% pulp densities, respectively. In general, the differences in copper leaching were relatively minor among the test cultures and between the chemical controls and inoculated cultures. Copper dissolution increased linearly when the redox potential was in the 320-370 mV range, and this involved the inhibition of bacterial iron oxidation by the chalcopyrite sample. (C) 2014 Elsevier B.V. All rights reserved.
dc.descriptionFinnish Funding Agency for Technology and Innovation (Finland Distinguished Professor Program)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionVale S.A. (Brazil)
dc.descriptionTampere Univ Technol, Dept Chem & Bioengn, FI-33101 Tampere, Finland
dc.descriptionUniv Estadual Paulista, Inst Quim Araraquara, Dept Bioquim & Tecnol Quim, BR-14901970 Araraquara, SP, Brazil
dc.descriptionOhio State Univ, Dept Microbiol, Columbus, OH 43210 USA
dc.descriptionUniv Estadual Paulista, Inst Quim Araraquara, Dept Bioquim & Tecnol Quim, BR-14901970 Araraquara, SP, Brazil
dc.descriptionFinnish Funding Agency for Technology and Innovation (Finland Distinguished Professor Program)402/06
dc.descriptionCNPq: 305890/2010-7
dc.descriptionFAPESP: 19868-5/2011
dc.format1-7
dc.languageeng
dc.publisherElsevier B.V.
dc.relationInternational Journal Of Mineral Processing
dc.relation2.255
dc.relation0,782
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAcidithiobacillus
dc.subjectBioleaching
dc.subjectChalcopyrite
dc.subjectIron oxidation
dc.subjectPassivation
dc.titleBacterial and chemical leaching of chalcopyrite concentrates as affected by the redox potential and ferric/ferrous iron ratio at 22 degrees C
dc.typeArtigo


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