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An impedance study of the adsorption of CuSO4 and SIBX on pyrrhotite samples of different provenances / Z. Ekmekçi in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 903–907 Titre : An impedance study of the adsorption of CuSO4 and SIBX on pyrrhotite samples of different provenances Type de document : texte imprimé Auteurs : Z. Ekmekçi, Auteur ; M. Becker, Auteur ; E. Bagci Tekes, Auteur Année de publication : 2011 Article en page(s) : pp. 903–907 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide  ores  Froth  flotation  Redox  reactions  Electrochemical  impedance  analysis Résumé : The non-stoichiometric sulfide mineral pyrrhotite (Fe(1−x)S), common to many nickel ore deposits, occurs in differing crystallographic forms and compositions. The processing of pyrrhotite from these ores through froth flotation is based on the surface properties of the sulfides and since pyrrhotite is a metallic conductor, it is of interest to characterise the surface properties of pyrrhotite with respect to its electrochemical state. In this study, a series of pyrrhotite samples derived from Canada, South Africa, and Botswana whose mineralogy is well characterised, were used for electrochemical impedance spectroscopy (EIS). The behaviour of the different pyrrhotite samples were compared in terms of the effect of pH (7 and 10), collector addition (SIBX) and copper activation and the results correlated with microflotation tests. The EIS results were then used to interpret and understand the differences in flotation performance of the pyrrhotite samples under the different reagent conditions and provide some answers as to why the success of copper activation on pyrrhotite is so variable. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000439 [article] An impedance study of the adsorption of CuSO4 and SIBX on pyrrhotite samples of different provenances [texte imprimé] / Z. Ekmekçi, Auteur ; M. Becker, Auteur ; E. Bagci Tekes, Auteur . - 2011 . - pp. 903–907. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 903–907 Mots-clés : Sulfide  ores  Froth  flotation  Redox  reactions  Electrochemical  impedance  analysis Résumé : The non-stoichiometric sulfide mineral pyrrhotite (Fe(1−x)S), common to many nickel ore deposits, occurs in differing crystallographic forms and compositions. The processing of pyrrhotite from these ores through froth flotation is based on the surface properties of the sulfides and since pyrrhotite is a metallic conductor, it is of interest to characterise the surface properties of pyrrhotite with respect to its electrochemical state. In this study, a series of pyrrhotite samples derived from Canada, South Africa, and Botswana whose mineralogy is well characterised, were used for electrochemical impedance spectroscopy (EIS). The behaviour of the different pyrrhotite samples were compared in terms of the effect of pH (7 and 10), collector addition (SIBX) and copper activation and the results correlated with microflotation tests. The EIS results were then used to interpret and understand the differences in flotation performance of the pyrrhotite samples under the different reagent conditions and provide some answers as to why the success of copper activation on pyrrhotite is so variable. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000439

A comparison of the flotation behaviour and the effect of copper activation on three reef types from the Merensky reef at Northam / C. P. Brough in Minerals engineering, Vol. 23 N° 11-13 (Octobre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 846–854 Titre : A comparison of the flotation behaviour and the effect of copper activation on three reef types from the Merensky reef at Northam Type de document : texte imprimé Auteurs : C. P. Brough, Auteur ; D. J. Bradshaw, Auteur ; M. Becker, Auteur Année de publication : 2011 Article en page(s) : pp. 846–854 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : PGM  ores  Sulfide  minerals  Pyrrhotite  Mineralogy Résumé : At Northam Platinum Mine in South Africa intense potholing of the Merensky Reef has led to the development of several mineralogically different reef types in proximity to one other, which results in differing processing performance. In particular, the nature and texture of the valuable sulfide minerals, as well as the nature of the gangue minerals and degree of alteration in the various reef types affects both milling throughput and flotation recovery. The three major ore types being processed and thus selected for this study are the Normal reef, NP2 reef and P2 reef. The focus of this study was to investigate the relationship between changes in mineralogy and the effect of copper sulfate addition at two grind sizes on the laboratory batch flotation performance obtained with the three reef types. The best results were obtained with the NP2 reef in terms of expected industrial throughput, recovery and grade of all base-metal sulfides despite this reef type having the lowest feed grade of sulfide minerals. The biggest difference was in the recovery and grade of pyrrhotite. The better performance of the NP2 reef ore relative to the Normal and P2 reefs has been attributed to the equigranular nature of the reef type together with its feldspathic mineralogy. In contrast, the Normal and P2 reefs are orthopyroxene rich and are associated with more alteration minerals. The Normal reef contained the greatest amount of alteration minerals which correlated to the poorest flotation performance in terms of recovery and grade at all conditions tested. Whereas addition of copper sulfate did not affect the flotation of the sulfides in the NP2 reef ore, it significantly improved the overall performance of the base-metal sulfides in the Normal and P2 reefs, especially for pyrrhotite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000944 [article] A comparison of the flotation behaviour and the effect of copper activation on three reef types from the Merensky reef at Northam [texte imprimé] / C. P. Brough, Auteur ; D. J. Bradshaw, Auteur ; M. Becker, Auteur . - 2011 . - pp. 846–854. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 11-13 (Octobre 2010) . - pp. 846–854 Mots-clés : PGM  ores  Sulfide  minerals  Pyrrhotite  Mineralogy Résumé : At Northam Platinum Mine in South Africa intense potholing of the Merensky Reef has led to the development of several mineralogically different reef types in proximity to one other, which results in differing processing performance. In particular, the nature and texture of the valuable sulfide minerals, as well as the nature of the gangue minerals and degree of alteration in the various reef types affects both milling throughput and flotation recovery. The three major ore types being processed and thus selected for this study are the Normal reef, NP2 reef and P2 reef. The focus of this study was to investigate the relationship between changes in mineralogy and the effect of copper sulfate addition at two grind sizes on the laboratory batch flotation performance obtained with the three reef types. The best results were obtained with the NP2 reef in terms of expected industrial throughput, recovery and grade of all base-metal sulfides despite this reef type having the lowest feed grade of sulfide minerals. The biggest difference was in the recovery and grade of pyrrhotite. The better performance of the NP2 reef ore relative to the Normal and P2 reefs has been attributed to the equigranular nature of the reef type together with its feldspathic mineralogy. In contrast, the Normal and P2 reefs are orthopyroxene rich and are associated with more alteration minerals. The Normal reef contained the greatest amount of alteration minerals which correlated to the poorest flotation performance in terms of recovery and grade at all conditions tested. Whereas addition of copper sulfate did not affect the flotation of the sulfides in the NP2 reef ore, it significantly improved the overall performance of the base-metal sulfides in the Normal and P2 reefs, especially for pyrrhotite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000944