Study of the deterioration of acid resins in cyclic duty / A.B. Nesbitt in Minerals engineering, Vol. 23 N° 6 (Mai 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 478–485 Titre : Study of the deterioration of acid resins in cyclic duty Type de document : texte imprimé Auteurs : A.B. Nesbitt, Auteur Année de publication : 2011 Article en page(s) : pp. 478–485 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Hydrometallurgy Ion exchange Oxidation Résumé : Two case studies are presented in which a continuous loss of capacity in two samples of acid resin, are observed over 900 cycles of loading and regeneration. By completing the batch kinetic testing of the resin at different turbulences and calculating the intra-particle diffusion rates of the counter and co-ion, the effect of turbulence on the independence/dependence of the intra-particle diffusion could be established. A systematic loss in capacity and change in kinetics is reported in both case studies and it is postulated that the reason for this is the loss of active sites within the resin matrix. The significance of this observation is that standard tests done for a new resin application could significantly overestimate the commercial performance of the resin concerned. This paper proposes a method in which resin might be studied prior to inclusion in a particular process, with the objective of determining its effective life span. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002957 [article] Study of the deterioration of acid resins in cyclic duty [texte imprimé] / A.B. Nesbitt, Auteur . - 2011 . - pp. 478–485. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 478–485 Mots-clés : Hydrometallurgy Ion exchange Oxidation Résumé : Two case studies are presented in which a continuous loss of capacity in two samples of acid resin, are observed over 900 cycles of loading and regeneration. By completing the batch kinetic testing of the resin at different turbulences and calculating the intra-particle diffusion rates of the counter and co-ion, the effect of turbulence on the independence/dependence of the intra-particle diffusion could be established. A systematic loss in capacity and change in kinetics is reported in both case studies and it is postulated that the reason for this is the loss of active sites within the resin matrix. The significance of this observation is that standard tests done for a new resin application could significantly overestimate the commercial performance of the resin concerned. This paper proposes a method in which resin might be studied prior to inclusion in a particular process, with the objective of determining its effective life span. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002957

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