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High-temperature conductivity measurements of concentrated NaCl-H2SO4-H2O solutions up to 250 °C / Ming Huang in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2781–2785 Titre : High-temperature conductivity measurements of concentrated NaCl-H2SO4-H2O solutions up to 250 °C Type de document : texte imprimé Auteurs : Ming Huang, Auteur ; Vladimiros G. Papangelakis, Auteur Année de publication : 2009 Article en page(s) : pp. 2781–2785 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Electrodeless  conductivity  cell  NaCl-H2SO4-H2O  solutions  Ionic  conductivity Résumé : An electrodeless conductivity cell was employed to investigate the electrical conductivity of concentrated NaCl−H2SO4−H2O solutions particularly at high temperatures. All solutions were measured from 25 to 250 °C at the equilibrium vapor pressures. The maximum measured concentrations of NaCl and H2SO4 were 0.40 and 0.45 m, respectively. At 250 °C and a fixed concentration of H2SO4, the conductivity of NaCl−H2SO4−H2O solutions increases with the increasing concentration of NaCl. Similarly, at 250 °C and a fixed concentration of NaCl, the conductivity of NaCl−H2SO4−H2O solutions increases with the increasing concentration of H2SO4. It was found that the ionic equivalent conductivity of H3O+ is a function of ionic strength at 250 °C and is independent of the solution speciation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801064v [article] High-temperature conductivity measurements of concentrated NaCl-H2SO4-H2O solutions up to 250 °C [texte imprimé] / Ming Huang, Auteur ; Vladimiros G. Papangelakis, Auteur . - 2009 . - pp. 2781–2785. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2781–2785 Mots-clés : Electrodeless  conductivity  cell  NaCl-H2SO4-H2O  solutions  Ionic  conductivity Résumé : An electrodeless conductivity cell was employed to investigate the electrical conductivity of concentrated NaCl−H2SO4−H2O solutions particularly at high temperatures. All solutions were measured from 25 to 250 °C at the equilibrium vapor pressures. The maximum measured concentrations of NaCl and H2SO4 were 0.40 and 0.45 m, respectively. At 250 °C and a fixed concentration of H2SO4, the conductivity of NaCl−H2SO4−H2O solutions increases with the increasing concentration of NaCl. Similarly, at 250 °C and a fixed concentration of NaCl, the conductivity of NaCl−H2SO4−H2O solutions increases with the increasing concentration of H2SO4. It was found that the ionic equivalent conductivity of H3O+ is a function of ionic strength at 250 °C and is independent of the solution speciation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801064v

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