Journal article
A fundamental study of gold leaching in a thiosulfate‑oxygen‑copper system in the presence of activated carbon
Hydrometallurgy, Vol.192, Art. 105232
2020
Abstract
Activated carbon has been found to significantly enhance the dissolution of gold in a thiosulfate‑oxygen‑copper system. Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated carbon was very slow, with only 2% gold dissolved over 24 h. In contrast, in the presence of activated carbon as an additive the gold leach recovery was dramatically improved to over 95% in the same period. Leaching and electrochemical studies using a gold rotating disc electrode have identified two impacts of activated carbon on the dissolution of gold: 1) enhancing the oxygen reduction half reaction via galvanic interaction and; 2) enhancing the gold oxidation half reaction via removal of the surface passivation. A combination of the two effects can potentially increase the gold leach rate to the same order of magnitude as a typical cyanidation rate (10−5 mol m−2 s−1). It has also been found that the presence of copper and the use of an elevated temperature are beneficial for the gold leaching; whilst the use of oxygen instead of air and change in pH between pH 7 and pH 10 have little impact.
Details
- Title
- A fundamental study of gold leaching in a thiosulfate‑oxygen‑copper system in the presence of activated carbon
- Authors/Creators
- O. Sitando (Author/Creator) - Murdoch UniversityX. Dai (Author/Creator) - Australian Resources Research CentreG. Senanayake (Author/Creator) - Murdoch UniversityA.N. Nikoloski (Author/Creator) - Murdoch UniversityP. Breuer (Author/Creator) - Australian Resources Research Centre
- Publication Details
- Hydrometallurgy, Vol.192, Art. 105232
- Publisher
- Elsevier BV
- Identifiers
- 991005544367807891
- Copyright
- © 2019 Elsevier B.V.
- Murdoch Affiliation
- College of Science, Health, Engineering and Education
- Language
- English
- Resource Type
- Journal article
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InCites Highlights
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- Collaboration types
- Domestic collaboration
- 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