Sulfur-enhanced reductive bioprocessing of cobalt-bearing materials for base metals recovery
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Santos et al. (2020) Sulfur-en ...
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Issue date
16/06/2020Submitted date
2020-06-09Subject Terms
acidophilic bacteriacobalt
limonitic laterite
nickel
ore processing residues
reductive bioleaching
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The 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.Citation
Ana 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.Publisher
Elsevier BVJournal
HydrometallurgyType
Journal ArticleItem Description
Copyright: © 2020 Elsevier B.V. All rights reserved. The attached file is the published version of the article.NHM Repository
ISSN
0304-386XEISSN
1879-1158ae974a485f413a2113503eed53cd6c53
10.1016/j.hydromet.2020.105396
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