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Interfacial properties of liquid sulfur in the pressure leaching of nickel concentrate / Libin Tong in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 456–461 Titre : Interfacial properties of liquid sulfur in the pressure leaching of nickel concentrate Type de document : texte imprimé Auteurs : Libin Tong, Auteur ; David Dreisinger, Auteur Année de publication : 2009 Article en page(s) : pp. 456–461 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide  ores  Hydrometallurgy  Leaching  Pressure  oxidation  Liquid  sulfur  Interfa Résumé : The effects of sulfur dispersing agents in the oxygen pressure leaching of nickel concentrate at medium temperature were investigated by interfacial studies. Liquid sulfur–aqueous solution interfacial tensions and liquid sulfur–sulfide mineral contact angles were measured at 140 °C, 690 kPa overpressure by nitrogen. The effects of sulfur dispersing agents including lignosulfonate, Quebracho, o-phenylenediamine (OPD), and humic acid were evaluated by the calculation of the work of adhesion in the liquid sulfur–sulfide mineral–aqueous solution systems. It was found that the sulfide mineral surface is sulfophobic at pH from 4.1 to 4.5 due to the hydrolysis of nickel (II) ions to nickel hydroxide and the deposition of nickel hydroxide on the mineral surface. These findings apply to four different sulfide mineral systems, including pentlandite, nickeliferous pyrrhotite, pyrrhotite, and chalcopyrite. Lignosulfonate, Quebracho, and humic acid were found to significantly reduce the work of adhesion indicating they should be effective sulfur dispersing agents. OPD is ineffective in changing the work of adhesion of sulfur on the mineral sulfides indicating that it is not a good candidate for sulfur dispersion. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002811 [article] Interfacial properties of liquid sulfur in the pressure leaching of nickel concentrate [texte imprimé] / Libin Tong, Auteur ; David Dreisinger, Auteur . - 2009 . - pp. 456–461. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 456–461 Mots-clés : Sulfide  ores  Hydrometallurgy  Leaching  Pressure  oxidation  Liquid  sulfur  Interfa Résumé : The effects of sulfur dispersing agents in the oxygen pressure leaching of nickel concentrate at medium temperature were investigated by interfacial studies. Liquid sulfur–aqueous solution interfacial tensions and liquid sulfur–sulfide mineral contact angles were measured at 140 °C, 690 kPa overpressure by nitrogen. The effects of sulfur dispersing agents including lignosulfonate, Quebracho, o-phenylenediamine (OPD), and humic acid were evaluated by the calculation of the work of adhesion in the liquid sulfur–sulfide mineral–aqueous solution systems. It was found that the sulfide mineral surface is sulfophobic at pH from 4.1 to 4.5 due to the hydrolysis of nickel (II) ions to nickel hydroxide and the deposition of nickel hydroxide on the mineral surface. These findings apply to four different sulfide mineral systems, including pentlandite, nickeliferous pyrrhotite, pyrrhotite, and chalcopyrite. Lignosulfonate, Quebracho, and humic acid were found to significantly reduce the work of adhesion indicating they should be effective sulfur dispersing agents. OPD is ineffective in changing the work of adhesion of sulfur on the mineral sulfides indicating that it is not a good candidate for sulfur dispersion. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002811

The adsorption of sulfur dispersing agents on sulfur and nickel sulfide concentrate surfaces / Libin Tong in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 445–450 Titre : The adsorption of sulfur dispersing agents on sulfur and nickel sulfide concentrate surfaces Type de document : texte imprimé Auteurs : Libin Tong, Auteur ; David Dreisinger, Auteur Année de publication : 2009 Article en page(s) : pp. 445–450 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide  ores  Hydrometallurgy  Leaching  Pressure  oxidation  Liquid  sulfur Résumé : The adsorption behavior of sulfur dispersing agents, including lignosulfonate, Quebracho, o-phenylenediamine (OPD), and humic acid on elemental sulfur and nickel sulfide concentrate was investigated. The charge changes on elemental sulfur surface were characterized by the measurement of the electrokinetic sonic amplitude (ESA) signal. The adsorption behavior of OPD was investigated by measuring the interfacial tension between liquid sulfur and nickel sulfate solution at 140 °C. The adsorption of lignosulfonate on the molten sulfur surface was calculated by the Gibbs Equation. The adsorption of lignosulfonate, Quebracho, and humic acid on the nickel concentrate was studied at ambient temperature. The adsorption mechanism of sulfur dispersing agents on both elemental sulfur and nickel concentrate were discussed. The stability of OPD in the nickel concentrate slurry was discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002781 [article] The adsorption of sulfur dispersing agents on sulfur and nickel sulfide concentrate surfaces [texte imprimé] / Libin Tong, Auteur ; David Dreisinger, Auteur . - 2009 . - pp. 445–450. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 445–450 Mots-clés : Sulfide  ores  Hydrometallurgy  Leaching  Pressure  oxidation  Liquid  sulfur Résumé : The adsorption behavior of sulfur dispersing agents, including lignosulfonate, Quebracho, o-phenylenediamine (OPD), and humic acid on elemental sulfur and nickel sulfide concentrate was investigated. The charge changes on elemental sulfur surface were characterized by the measurement of the electrokinetic sonic amplitude (ESA) signal. The adsorption behavior of OPD was investigated by measuring the interfacial tension between liquid sulfur and nickel sulfate solution at 140 °C. The adsorption of lignosulfonate on the molten sulfur surface was calculated by the Gibbs Equation. The adsorption of lignosulfonate, Quebracho, and humic acid on the nickel concentrate was studied at ambient temperature. The adsorption mechanism of sulfur dispersing agents on both elemental sulfur and nickel concentrate were discussed. The stability of OPD in the nickel concentrate slurry was discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002781