A novel pre-treatment of calaverite by hydrothermal mineral replacement reactions / Zhao, Jing in Minerals engineering, Vol. 23 N° 5 (Avril 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 451–453 Titre : A novel pre-treatment of calaverite by hydrothermal mineral replacement reactions Type de document : texte imprimé Auteurs : Zhao, Jing, Auteur ; Fang Xia, Auteur ; Allan Pring, Auteur Année de publication : 2011 Article en page(s) : pp. 451–453 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Precious metal ores Hydrometallurgy Extractive metallurgy Résumé : We report a new method for pre-treatment of refractory gold-bearing tellurides employing the hydrothermal mineral replacement reactions. The method is illustrated by the replacement of calaverite by metallic gold at 150–250 °C under vapor saturated pressures. The influences of temperature, pH, and additional salts (NaCl and Na2SO4) on the conversion rate were investigated using the orthogonal array design method. The results indicate that temperature is the most significant factor, followed by pH, and then additional salts. The optimal condition for fast and low cost conversion is 200 °C, pH 6.0, 0.01 M NaCl, and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002933 [article] A novel pre-treatment of calaverite by hydrothermal mineral replacement reactions [texte imprimé] / Zhao, Jing, Auteur ; Fang Xia, Auteur ; Allan Pring, Auteur . - 2011 . - pp. 451–453. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 451–453 Mots-clés : Precious metal ores Hydrometallurgy Extractive metallurgy Résumé : We report a new method for pre-treatment of refractory gold-bearing tellurides employing the hydrothermal mineral replacement reactions. The method is illustrated by the replacement of calaverite by metallic gold at 150–250 °C under vapor saturated pressures. The influences of temperature, pH, and additional salts (NaCl and Na2SO4) on the conversion rate were investigated using the orthogonal array design method. The results indicate that temperature is the most significant factor, followed by pH, and then additional salts. The optimal condition for fast and low cost conversion is 200 °C, pH 6.0, 0.01 M NaCl, and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002933

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