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

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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

Keywords

Chalcopyrite
Electrochemistry
Ferric sulphate leaching
Passivation

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10.1016/j.biortech.2005.07.016

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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",

author = "Kinnunen, {P. H.M.} and S. Heimala and Riekkola-Vanhanen, {M. L.} and Puhakka, {J. A.}",

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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

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IS - 14

ER -

Chalcopyrite concentrate leaching with biologically produced ferric sulphate

Abstract

Keywords

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