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

dc.contributor.authorBevilaqua, Denise [UNESP]
dc.contributor.authorLahti-Tommila, Heidi
dc.contributor.authorGarcia, Oswaldo [UNESP]
dc.contributor.authorPuhakka, Jaakko A.
dc.contributor.authorTuovinen, Olli H.
dc.contributor.institutionTampere Univ Technol
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionOhio State Univ
dc.date.accessioned2015-03-18T15:53:42Z
dc.date.available2015-03-18T15:53:42Z
dc.date.issued2014-11-10
dc.description.abstractBiological 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.en
dc.description.affiliationTampere Univ Technol, Dept Chem & Bioengn, FI-33101 Tampere, Finland
dc.description.affiliationUniv Estadual Paulista, Inst Quim Araraquara, Dept Bioquim & Tecnol Quim, BR-14901970 Araraquara, SP, Brazil
dc.description.affiliationOhio State Univ, Dept Microbiol, Columbus, OH 43210 USA
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim Araraquara, Dept Bioquim & Tecnol Quim, BR-14901970 Araraquara, SP, Brazil
dc.description.sponsorshipFinnish Funding Agency for Technology and Innovation (Finland Distinguished Professor Program)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipVale S.A. (Brazil)
dc.description.sponsorshipIdFinnish Funding Agency for Technology and Innovation (Finland Distinguished Professor Program)402/06
dc.description.sponsorshipIdCNPq: 305890/2010-7
dc.description.sponsorshipIdFAPESP: 19868-5/2011
dc.format.extent1-7
dc.identifierhttp://dx.doi.org/10.1016/j.minpro.2014.08.008
dc.identifier.citationInternational Journal Of Mineral Processing. Amsterdam: Elsevier Science Bv, v. 132, p. 1-7, 2014.
dc.identifier.doi10.1016/j.minpro.2014.08.008
dc.identifier.issn0301-7516
dc.identifier.urihttp://hdl.handle.net/11449/116668
dc.identifier.wosWOS:000344212300001
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofInternational Journal Of Mineral Processing
dc.relation.ispartofjcr2.255
dc.relation.ispartofsjr0,782
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAcidithiobacillusen
dc.subjectBioleachingen
dc.subjectChalcopyriteen
dc.subjectIron oxidationen
dc.subjectPassivationen
dc.titleBacterial and chemical leaching of chalcopyrite concentrates as affected by the redox potential and ferric/ferrous iron ratio at 22 degrees Cen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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