Gold recovery from a refractory arsenopyrite (FeAsS) concentrate by in-situ slurry oxidation
| Autor: | Nicholas J. Welham, H.G. Linge |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Arsenopyrite
Hydrometallurgy Chemistry Mechanical Engineering Metallurgy food and beverages chemistry.chemical_element General Chemistry engineering.material Geotechnical Engineering and Engineering Geology Gersdorffite Control and Systems Engineering visual_art Slurry engineering Chlorine visual_art.visual_art_medium Leaching (metallurgy) Pyrite Roasting |
| Zdroj: | Minerals Engineering. 10:557-566 |
| ISSN: | 0892-6875 |
| DOI: | 10.1016/s0892-6875(97)00035-6 |
| Popis: | Arsenopyritic gold is a major source of refractory gold not amenable to roasting. Bio-oxidation is a popular treatment option but is slow and needs careful control of the As content of the feed. Electrochemical slurry oxidation in-situ with chlorine in acidified salt water in a membrane cell reactor has been evaluated at laboratory-scale level as a potential processing route. A refractory mine concentrate (cyanideable gold content ∼ 7%) containing arsenopyrite (FeAsS), pyrite (FeS 2 ) and gersdorffite (NiAsS) has been used to demonstrate that gold recovery > 90% could be achieved. Reaction rates are but sale of the co-produced NaOH can be a valuable process credit. This route can provide a more environmentally friendly process flow-sheet than carbon-in-pulp/leach processing and can be applied to a small or large resource. |
| Databáze: | OpenAIRE |
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