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Role of Microbial Activity in Bioleaching of a Pyritic and a Pure Chalcopyrite Concentrate
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-3255-3051
Linnaeus University, Kalmar, Department of Molecular Biology, Umeå University, Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
2015 (English)In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 1130, p. 209-213Article in journal (Refereed) Published
Abstract [en]

Leaching of a pyritic and a pure chalcopyrite concentrate was carried out in stirred tank reactors in the absence and presence of a mixed culture of moderately thermophilic microorganisms at 45°C and pH 1.5. To study the effect of microbial activity on copper dissolution, the abiotic experiments were performed under accurately controlled redox potential conditions to reproduce the same oxidising conditions recorded during the bioleaching experiments. X-ray photoelectron spectrometry (XPS) was used to study the surface of chalcopyrite chips leached for different durations. The results showed that the microorganisms in cases of both concentrates did not have any effect in the copper leaching efficiency other than oxidation of ferrous to ferric ions. Biooxidation of elemental sulphur did not improve the leaching efficiency and bulk and surface jarosite had no negative effect on dissolution. A composite layer composed of mainly elemental sulphur and iron-oxy-hydroxide was found to be responsible for the hindered dissolution.

Place, publisher, year, edition, pages
2015. Vol. 1130, p. 209-213
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-29876DOI: 10.4028/www.scientific.net/AMR.1130.209Local ID: 37e3ac66-a9ed-4a31-b501-c3c853fdca62OAI: oai:DiVA.org:ltu-29876DiVA, id: diva2:1003103
Conference
International Biohydrometallurgy Symposium : 05/10/2015 - 09/10/2015
Note
Validerad; 2016; Nivå 1; 20151029 (seykos); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-30Bibliographically approved

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Sany, Seyed Mohammad KhoshkhooSandström, Åke

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