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Passivation of chalcopyrite during its chemical leaching with ferric ion at 68 °C / E.M. Córdoba in Minerals engineering, Vol. 22 N° 3 (Fevrier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 229–235 Titre : Passivation of chalcopyrite during its chemical leaching with ferric ion at 68 °C Type de document : texte imprimé Auteurs : E.M. Córdoba, Auteur ; J.A. Muñoz, Auteur ; M. L. Blázquez, Auteur Année de publication : 2009 Article en page(s) : pp. 229–235 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide  ores  Hydrometallurgy  Mineral  processing Index. décimale : 622 Industrie minière Résumé : The passivation of chalcopyrite in the presence of ferric sulphate solutions was investigated at 68 °C. The effect of different variables (pulp density, pH and the presence of oxygen) on both the copper dissolution rate and the formation of solid compounds was studied. The leaching tests were carried out in stirred flasks at 180 rpm with 100 mL of a Fe3+/Fe2+ sulphate solution, varying the pulp density between 0.1 and 5% and the pH between 0.5 and 2.0 and both in aerobic and anaerobic conditions. Ferric ion seems to be responsible for the oxidation of chalcopyrite but also promotes its passivation. Ferrous ion plays a key role in the process by controlling the nucleation and precipitation of jarosites, which finally cause the passivation of chalcopyrite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001830 [article] Passivation of chalcopyrite during its chemical leaching with ferric ion at 68 °C [texte imprimé] / E.M. Córdoba, Auteur ; J.A. Muñoz, Auteur ; M. L. Blázquez, Auteur . - 2009 . - pp. 229–235. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 229–235 Mots-clés : Sulphide  ores  Hydrometallurgy  Mineral  processing Index. décimale : 622 Industrie minière Résumé : The passivation of chalcopyrite in the presence of ferric sulphate solutions was investigated at 68 °C. The effect of different variables (pulp density, pH and the presence of oxygen) on both the copper dissolution rate and the formation of solid compounds was studied. The leaching tests were carried out in stirred flasks at 180 rpm with 100 mL of a Fe3+/Fe2+ sulphate solution, varying the pulp density between 0.1 and 5% and the pH between 0.5 and 2.0 and both in aerobic and anaerobic conditions. Ferric ion seems to be responsible for the oxidation of chalcopyrite but also promotes its passivation. Ferrous ion plays a key role in the process by controlling the nucleation and precipitation of jarosites, which finally cause the passivation of chalcopyrite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001830