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Journal article
The combined leaching of copper, gold and uranium in chloride solutions. I. Chalcopyrite
Hydrometallurgy, Vol.231, 106406
2025
Abstract
In a study (Part II) aimed at the simultaneous heap leaching of copper (predominantly chalcopyrite), gold and uranium from an ore, it was found that this could be achieved using chlorate as the oxidant in chloride solutions. As a result, a more detailed study has been made using electrochemical and batch leach tests on pure chalcopyrite electrodes under typical heap leach conditions.
The use of chlorate at moderately low concentrations has shown that enhanced rates of dissolution of chalcopyrite can be maintained over periods up to 4 days at ambient temperatures in acidic chloride solutions. The rate of dissolution is enhanced at higher acid concentrations. The rate in the presence of chlorate does not appear to depend on the iron(III) (and presumably the copper(II)) concentration.
The observed rates are significantly greater than those predicted for oxidative dissolution from the electrochemistry and the mixed potential model. An alternative non-oxidative mechanism has been revisited to account for this difference.
A preliminary measurement has been made of the kinetics of the oxidation of hydrogen sufide and iron(III) by low concentrations of chlorine produced by reaction of chlorate with chloride ions. These reactions are rapid, and theory shows that they would support the proposed non-oxidative mechanism.
Details
- Title
- The combined leaching of copper, gold and uranium in chloride solutions. I. Chalcopyrite
- Authors/Creators
- M. Nicol - School of Information Technology and Engineering, Murdoch University, Perth, WA 6150, AustraliaK. Ye - BHP Billiton Innovation Pty Ltd, 171 Collins Street, Melbourne, Vic 3000, USAN. Garrard - BHP Billiton Innovation Pty Ltd, 171 Collins Street, Melbourne, Vic 3000, USA
- Publication Details
- Hydrometallurgy, Vol.231, 106406
- Publisher
- Elsevier B.V
- Number of pages
- 9
- Identifiers
- 991005707262207891
- Copyright
- © 2024 The Authors.
- Murdoch Affiliation
- School of Information Technology
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 7 Engineering & Materials Science
- 7.229 Mineral & Metal Processing
- 7.229.774 Bioleaching
- Web Of Science research areas
- Metallurgy & Metallurgical Engineering
- ESI research areas
- Materials Science