- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Faculty Research and Publications /
- Atmospheric Ferric Sulfate Leaching of Chalcopyrite...
Open Collections
UBC Faculty Research and Publications
Atmospheric Ferric Sulfate Leaching of Chalcopyrite : Thermodynamics, Kinetics and Electrochemistry Olvera, Oscar G; Rebolledo, M.; Asselin, Edouard
Abstract
The dissolution of chalcopyrite has been studied from an integrated point of view where the thermodynamics, dissolution kinetics and electrochemical behavior have been considered together. The variations in mixed potential and dissolution current density were interpreted considering the aqueous speciation of the electrolyte and the semiconductor properties of the chalcopyrite. This leads to the conclusion that CuFeS₂ dissolution rates are not a simple function of the nominal ferric concentration or of the nominal ratio of ferric to ferrous. The differences observed in the anodic charge transfer coefficient for the dissolution of chalcopyrite and the limiting current densities observed in potentiodynamic experiments at different temperatures have been explained in terms of the semiconductor properties of chalcopyrite (and/or its reaction product surface film). The differences between studying the electrochemistry of chalcopyrite by imposing an electrode potential using a potentiostat and by using a solution of known redox potential, as well as the differences in the interpretation of experimental results when redox potential is used instead of mixed potential are also discussed. It is shown that extrapolation of electrochemically-obtained results to leaching operations should be done with care.
Item Metadata
Title |
Atmospheric Ferric Sulfate Leaching of Chalcopyrite : Thermodynamics, Kinetics and Electrochemistry
|
Creator | |
Publisher |
Elsevier
|
Date Issued |
2016-10
|
Description |
The dissolution of chalcopyrite has been studied from an integrated point of view where
the thermodynamics, dissolution kinetics and electrochemical behavior have been
considered together. The variations in mixed potential and dissolution current density
were interpreted considering the aqueous speciation of the electrolyte and the
semiconductor properties of the chalcopyrite. This leads to the conclusion that
CuFeS₂ dissolution rates are not a simple function of the nominal ferric concentration or
of the nominal ratio of ferric to ferrous.
The differences observed in the anodic charge transfer coefficient for the dissolution of
chalcopyrite and the limiting current densities observed in potentiodynamic experiments
at different temperatures have been explained in terms of the semiconductor properties
of chalcopyrite (and/or its reaction product surface film). The differences between
studying the electrochemistry of chalcopyrite by imposing an electrode potential using a
potentiostat and by using a solution of known redox potential, as well as the differences
in the interpretation of experimental results when redox potential is used instead of mixed potential are also discussed. It is shown that extrapolation of electrochemically-obtained results to leaching operations should be done with care.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2021-09-29
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
|
DOI |
10.14288/1.0402345
|
URI | |
Affiliation | |
Citation |
Olvera, O.G., Rebolledo M., Asselin E. Hydro- metallurgy atmospheric ferric sulfate leaching of chalcopyrite: Thermodynamics, kinetics and electro- chemistry [J]. Hydrometallurgy, 2016, 165: 148–158.
|
Publisher DOI |
10.1016/j.hydromet.2015.09.017
|
Peer Review Status |
Reviewed
|
Scholarly Level |
Faculty; Graduate
|
Rights URI | |
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International