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dc.contributor.authorSantos, Ana Laura
dc.contributor.authorDybowska, Agnieszka
dc.contributor.authorSchofield, Paul
dc.contributor.authorHerrington, Richard J
dc.contributor.authorJohnson, D Barrie
dc.date.accessioned2022-09-05T14:25:01Z
dc.date.available2022-09-05T14:25:01Z
dc.date.issued2020-06-16
dc.date.submitted2020-06-09
dc.identifier.citationAna Laura Santos, Agnieszka Dybowska, Paul F. Schofield, Richard J. Herrington, D. Barrie Johnson, Sulfur-enhanced reductive bioprocessing of cobalt-bearing materials for base metals recovery, Hydrometallurgy, Volume 195, 2020, 105396, ISSN 0304-386X, https://doi.org/10.1016/j.hydromet.2020.105396.en_US
dc.identifier.issn0304-386X
dc.identifier.doi10.1016/j.hydromet.2020.105396
dc.identifier.urihttp://hdl.handle.net/10141/623018
dc.description.abstractThe abundance of limonitic laterite ores in tropical and sub-tropical areas represents a large, and mostly unexploited, cobalt resource. Bioprocessing oxidised ores, and also waste materials such as tailings and processing residues, using acidophilic microorganisms to catalyse the reductive dissolution of iron and manganese minerals, is an environmentally benign alternative approach of extracting valuable base metals associated with these deposits. This work describes results from laboratory-scale experiments in which five cobalt-bearing materials, three primary limonitic laterite ores and two processing residues (filter dust and slag), all sourced from mines and a processing plant in Greece, were bioleached under reducing conditions by a consortium of acidophilic bacteria (using elemental sulfur as electron donor) in stirred tank bioreactors at pH 1.5 and 35 °C. Whilst the target metal, cobalt, was successfully bioleached from all five materials (40–50% within 30 days) the extraction of some other metals was more variable (e.g. between 2 and 48% of iron). Concentrations of soluble cobalt were highly correlated, in most cases, with those of manganese, in agreement with the finding that cobalt was primarily deported in manganese (IV) minerals. Acid consumption also differed greatly between mineral samples, ranging between 3 and 67 moles H2SO4 g−1 cobalt extracted. Comprehensive mineralogical analysis of the three limonitic samples before and after bioprocessing revealed significant variations between the ores, and demonstrated that elemental and mineralogical variabilities can greatly impact their amenability for reductive bioleaching.en_US
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.rightsembargoedAccessen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleSulfur-enhanced reductive bioprocessing of cobalt-bearing materials for base metals recoveryen_US
dc.typeJournal Articleen_US
dc.identifier.eissn1879-1158
dc.identifier.journalHydrometallurgyen_US
dc.date.updated2022-08-24T15:14:00Z
dc.identifier.volume195en_US
dc.identifier.startpage105396-105396en_US
elements.import.authorSantos, Ana Laura
elements.import.authorDybowska, Agnieszka
elements.import.authorSchofield, Paul F
elements.import.authorHerrington, Richard J
elements.import.authorJohnson, D Barrie
dc.description.nhmCopyright: © 2020 Elsevier B.V. All rights reserved. The attached file is the published version of the article.en_US
dc.subject.nhmacidophilic bacteriaen_US
dc.subject.nhmcobalten_US
dc.subject.nhmlimonitic lateriteen_US
dc.subject.nhmnickelen_US
dc.subject.nhmore processing residuesen_US
dc.subject.nhmreductive bioleachingen_US
refterms.dateFOA2022-06-17T00:00:00Z


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