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Comparative assesment of Industrial oxidic by-products as neutralising agents in biooxidation and their influence on gold recovery in subsequent cyanidation
Boliden Mineral AB.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2011 (English)In: Proceedings of the XI International Seminar onMineral Processing Technology (MPT-2010) / [ed] R. Ringh; A. Das; P.K. Banerjee; K.K. Bhattacharyya; N.G. Goswami, 2011, 1293-1302 p.Conference paper (Refereed)
Abstract [en]

The neutralisation cost in bioleaching operations is one of the biggest operation costs and therefore the aim of the present study has been to replace the generally used lime/limestone with industrial oxidic by-products. A comparative study on the potential use of some selected industrial by-products as neutralising agents during biooxidation and their influence on subsequent gold recovery was carried out with reference to a commercial grade Ca(OH)2. The by-products used comprised of an electric arc furnace slag (EAF slag), and a slag from ladle refining (Ladle slag) both from scrap based steel production, an EAF dust and a lime sludge from paper and pulp industry (Mesa lime). Continuous biooxidation of a refractory gold concentrate was performed in single stage reactor at a retention time of 56 h with a mixed mesophilic culture. Biooxidation results as well as gold recoveries were good for all by-products investigated and similar to the results obtained with the slaked lime reference. However, cyanide consumption was elevated in the experiments with steel slags and the EAF dust partly because of a higher content of S° in the bioresidues in these experiments. It is however expected, that in a bioleaching operation with several reactors in series, that sulphur oxidation would be more complete, thereby possibly decreasing cyanide consumption.

Place, publisher, year, edition, pages
2011. 1293-1302 p.
Research subject
Process Metallurgy
URN: urn:nbn:se:ltu:diva-31442Local ID: 59d2ab70-c3e5-11df-a707-000ea68e967bOAI: diva2:1004676
International Seminar on Mineral Processing Technology : 15/12/2010 - 17/12/2010
Godkänd; 2010; 20110412 (andbra)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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Gahan, Chandra SekharEngström, FredrikSandström, Åke
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