Chalcopyrite concentrate leaching with biologically produced ferric sulphate

P. H.M. Kinnunen; S. Heimala; M. L. Riekkola-Vanhanen; J. A. Puhakka

doi:10.1016/j.biortech.2005.07.016

Chalcopyrite concentrate leaching with biologically produced ferric sulphate

P. H.M. Kinnunen^*
, S. Heimala
, M. L. Riekkola-Vanhanen
, J. A. Puhakka

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

49 Citations (Scopus)

Abstract

Biological ferric iron production was combined with ferric sulphate leaching of chalcopyrite concentrate and the effects of pH, Fe³⁺, temperature and solids concentration on the leaching were studied. The copper leaching rates were similar at pH of 1.0-1.8 and in the presence of 7-90 g L^-1 Fe³⁺ despite massive iron precipitation with 90 g L^-1 Fe³⁺. Increase of the leaching temperature from 50 °C to 86 °C and solids concentration from 1% to 10% increased the copper leaching rate. Increase in solids concentration from 1% to 10% decreased the copper yields from 80% to 40%. Stepwise addition of ferric iron did not improve the copper yields. CuFeS₂, Ag and Cu_1.96S potentials indicated the formation of a passivating layer, which consisted of jarosite and sulphur precipitates and which was responsible for the decreased leaching rates.

Original language	English
Pages (from-to)	1727-1734
Number of pages	8
Journal	Bioresource Technology
Volume	97
Issue number	14
DOIs	https://doi.org/10.1016/j.biortech.2005.07.016
Publication status	Published - 1 Sept 2006
MoE publication type	Not Eligible

Funding

This work was funded by the graduate school of Tampere University of Technology and Outokumpu Oyj. We thank Minna Männistö and Virpi Salo for the construction of the reactors.

Keywords

Chalcopyrite
Electrochemistry
Ferric sulphate leaching
Passivation

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10.1016/j.biortech.2005.07.016

Cite this

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title = "Chalcopyrite concentrate leaching with biologically produced ferric sulphate",

abstract = "Biological ferric iron production was combined with ferric sulphate leaching of chalcopyrite concentrate and the effects of pH, Fe3+, temperature and solids concentration on the leaching were studied. The copper leaching rates were similar at pH of 1.0-1.8 and in the presence of 7-90 g L-1 Fe3+ despite massive iron precipitation with 90 g L-1 Fe3+. Increase of the leaching temperature from 50 °C to 86 °C and solids concentration from 1\% to 10\% increased the copper leaching rate. Increase in solids concentration from 1\% to 10\% decreased the copper yields from 80\% to 40\%. Stepwise addition of ferric iron did not improve the copper yields. CuFeS2, Ag and Cu1.96S potentials indicated the formation of a passivating layer, which consisted of jarosite and sulphur precipitates and which was responsible for the decreased leaching rates.",

keywords = "Chalcopyrite, Electrochemistry, Ferric sulphate leaching, Passivation",

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T1 - Chalcopyrite concentrate leaching with biologically produced ferric sulphate

AU - Kinnunen, P. H.M.

AU - Heimala, S.

AU - Riekkola-Vanhanen, M. L.

AU - Puhakka, J. A.

PY - 2006/9/1

Y1 - 2006/9/1

N2 - Biological ferric iron production was combined with ferric sulphate leaching of chalcopyrite concentrate and the effects of pH, Fe3+, temperature and solids concentration on the leaching were studied. The copper leaching rates were similar at pH of 1.0-1.8 and in the presence of 7-90 g L-1 Fe3+ despite massive iron precipitation with 90 g L-1 Fe3+. Increase of the leaching temperature from 50 °C to 86 °C and solids concentration from 1% to 10% increased the copper leaching rate. Increase in solids concentration from 1% to 10% decreased the copper yields from 80% to 40%. Stepwise addition of ferric iron did not improve the copper yields. CuFeS2, Ag and Cu1.96S potentials indicated the formation of a passivating layer, which consisted of jarosite and sulphur precipitates and which was responsible for the decreased leaching rates.

AB - Biological ferric iron production was combined with ferric sulphate leaching of chalcopyrite concentrate and the effects of pH, Fe3+, temperature and solids concentration on the leaching were studied. The copper leaching rates were similar at pH of 1.0-1.8 and in the presence of 7-90 g L-1 Fe3+ despite massive iron precipitation with 90 g L-1 Fe3+. Increase of the leaching temperature from 50 °C to 86 °C and solids concentration from 1% to 10% increased the copper leaching rate. Increase in solids concentration from 1% to 10% decreased the copper yields from 80% to 40%. Stepwise addition of ferric iron did not improve the copper yields. CuFeS2, Ag and Cu1.96S potentials indicated the formation of a passivating layer, which consisted of jarosite and sulphur precipitates and which was responsible for the decreased leaching rates.

KW - Chalcopyrite

KW - Electrochemistry

KW - Ferric sulphate leaching

KW - Passivation

UR - https://www.scopus.com/pages/publications/33744977223

U2 - 10.1016/j.biortech.2005.07.016

DO - 10.1016/j.biortech.2005.07.016

M3 - Article

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SN - 0960-8524

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SP - 1727

EP - 1734

JO - Bioresource Technology

JF - Bioresource Technology

IS - 14

ER -

Chalcopyrite concentrate leaching with biologically produced ferric sulphate

Abstract

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Keywords

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