Pressure oxidation of pyrite-arsenopyrite refractory gold concentrate

• Autorzy: Rusanen L. , Aromaa J. , Forsen O.
• Języki publikacji: EN

Abstrakty

EN

Refractory gold ores have poor gold recoveries with direct cyanide leaching. Typically the refractoriness is due to encapsulation of the gold particles inside the host mineral. To liberate gold for leaching the host mineral must be broken by mechanical or chemical means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in an autoclave were done using a factorial design. Different responses were measured and analysed to study effect of the three factors and oxidation kinet-ics. Generally, high slurry density required high temperature and oxygen partial pressure to reach com-plete oxidation. Oxidation kinetics at 225°C temperature, with 1050 kPa oxygen partial pressure and 15% slurry density was found to be fastest resulting in complete conversion of sulfides in 30 minutes. At 195°C, 700 kPa oxygen partial pressure and 10% slurry density, the oxidation kinetics for complete sul-fide conversion was about 60 minutes. Slurry densities above 10% had an adverse effect on the oxidation rate, when the temperature was below 225°C and oxygen partial pressure below 1050 kPa.

Słowa kluczowe

EN

gold ore; hydrometallurgy; leaching; factorial design

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2013
• Tom: Vol. 49, iss. 1
• Strony: 101--109
• Opis fizyczny: Bibliogr. 10 poz., tab., wykr.

Twórcy

autor

Rusanen L.

• Aalto University, Department of Materials Science. P.O. Box 16200, Aalto, Espoo, Finland

autor

Aromaa J.

• Aalto University, Department of Materials Science. P.O. Box 16200, Aalto, Espoo, Finland,

autor

Forsen O.

• Aalto University, Department of Materials Science. P.O. Box 16200, Aalto, Espoo, Finland

Bibliografia

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• 5. BAILEY, L.K., PETERS, E., 1976, Decomposition of pyrite in acids by pressure leaching and anodiza-tion: the case for an electrochemical mechanism. Canadian Metallurgical Quarterly 15, 4, 333–344.
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• 7. PAPANGELAKIS, V.G., DEMOPOULOS, G.P., 1990, Acid Pressure Oxidation of Arsenopyrite: Part I, Reaction Chemistry. Canadian Metallurgical Quarterly 29, 1, 1–12.
• 8. LONG, H., DIXON, D.G., 2004, Pressure oxidation of pyrite in sulfuric acid media: a kinetic study. Hydrometallurgy 73, 3–4, pp. 335–349.
• 9. FLEMING, C.A., 2010, Basic iron sulfate – a potential killer in the processing of refractory gold concen-trates by pressure oxidation. Minerals & Metallurgical Processing 27, 2, 81–88.
• 10. TROMANS, D., 1998, Oxygen solubility modeling in inorganic solutions: concentration, temperature and pressure effects. Hydrometallurgy 50, 3, 279–296.