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Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions / Reuben J. Mathew in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1113–1119 Titre : Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions Type de document : texte imprimé Auteurs : Reuben J. Mathew, Auteur ; Vladimiros G. Papangelakis, Auteur ; Eduard Guerra, Auteur Année de publication : 2011 Article en page(s) : pp. 1113–1119 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide  ores  Fine  particle  processing  Leaching  Hydrometallurgy  Surface  modification Résumé : Sulfur occlusion of pyrite particles during oxidative pressure leaching of mineral sulfide concentrates at temperatures below 160 °C has a deleterious effect on pyrite oxidation kinetics. Existing techniques in mitigating sulfur occlusion involve the use of surfactants or operation at temperatures above 160 °C which are a burden to the process economy. This study looks at the suitability of polytetrafluoroethylene (PTFE) to act as a solid sorbent for the liquid sulfur generated during the pressure leach process. The suitability of PTFE as a solid sorbent was determined by comparing interfacial phenomena in the corresponding sulfur–PTFE–leach and sulfur–mineral–leach systems. The work of adhesion in a sulfur–PTFE system was calculated using the interfacial tension and contact angle measured in the relevant sulfur–PTFE system, which is comparable to published values in the pyrite–sulfur system. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001731 [article] Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions [texte imprimé] / Reuben J. Mathew, Auteur ; Vladimiros G. Papangelakis, Auteur ; Eduard Guerra, Auteur . - 2011 . - pp. 1113–1119. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1113–1119 Mots-clés : Sulphide  ores  Fine  particle  processing  Leaching  Hydrometallurgy  Surface  modification Résumé : Sulfur occlusion of pyrite particles during oxidative pressure leaching of mineral sulfide concentrates at temperatures below 160 °C has a deleterious effect on pyrite oxidation kinetics. Existing techniques in mitigating sulfur occlusion involve the use of surfactants or operation at temperatures above 160 °C which are a burden to the process economy. This study looks at the suitability of polytetrafluoroethylene (PTFE) to act as a solid sorbent for the liquid sulfur generated during the pressure leach process. The suitability of PTFE as a solid sorbent was determined by comparing interfacial phenomena in the corresponding sulfur–PTFE–leach and sulfur–mineral–leach systems. The work of adhesion in a sulfur–PTFE system was calculated using the interfacial tension and contact angle measured in the relevant sulfur–PTFE system, which is comparable to published values in the pyrite–sulfur system. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001731