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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]  in Minerals 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 <38 μm particle size. Under this condition, the conversion can be completed within 15 h. These preliminary results indicate that the hydrothermal mineral replacement reaction is a promising pre-treating step for gold-bearing tellurides processing. 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 <38 μm particle size. Under this condition, the conversion can be completed within 15 h. These preliminary results indicate that the hydrothermal mineral replacement reaction is a promising pre-treating step for gold-bearing tellurides processing. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002933