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Liquid membrane process for the selective recovery of uranium from industrial leach solutions / P. S. Kulkarni 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. 3118–3125 Titre : Liquid membrane process for the selective recovery of uranium from industrial leach solutions Type de document : texte imprimé Auteurs : P. S. Kulkarni, Auteur ; S. Mukhopadhyay, Auteur ; S. K. Ghosh, Auteur Année de publication : 2009 Article en page(s) : pp. 3118–3125 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Leach  liquor  Uranium  Emulsion  liquid  membrane Résumé : Leach liquor of uranium concentrates are generated at Uranium Corporation of India Limited (UCIL), Jaduguda, India. Application of the emulsion liquid membrane (ELM) technique was tested for the efficient recovery of uranium from the leach liquor, in the presence of metal ions such as Fe, Ca, Mg, and Mn. The liquid membrane employed consisted of a diluent (light and heavy paraffin), a surfactant (Span 80), and an extractant (Alamine 336), and sodium carbonate was used as the stripping solution. Initially, the ELM process parameters were optimized by using synthetic leach liquor as the feed phase. The role of the acidic feed-phase pH, which enhances the cotransport of H+ ions along with uranium inside the emulsion globules, was found to be significant, as it helped in achieving the complete extraction and stripping of uranium. The best optimized parameters were directly used for the separation and concentration of uranium from industrial leach solutions. In one step, in the presence of various metal ions, the selective permeation of uranyl ions through the liquid membrane was observed to be greater than 90%, and the concentration of uranium inside the strip phase was observed to be nearly 7 times higher. Separation factors of uranium with respect to Fe, Mg, Ca, and Mn were experimentally found to be 129, 781, 43, and 1462, respectively, in 12 min. Finally, application of the process in uranium ore processing is demonstrated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800819q [article] Liquid membrane process for the selective recovery of uranium from industrial leach solutions [texte imprimé] / P. S. Kulkarni, Auteur ; S. Mukhopadhyay, Auteur ; S. K. Ghosh, Auteur . - 2009 . - pp. 3118–3125. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3118–3125 Mots-clés : Leach  liquor  Uranium  Emulsion  liquid  membrane Résumé : Leach liquor of uranium concentrates are generated at Uranium Corporation of India Limited (UCIL), Jaduguda, India. Application of the emulsion liquid membrane (ELM) technique was tested for the efficient recovery of uranium from the leach liquor, in the presence of metal ions such as Fe, Ca, Mg, and Mn. The liquid membrane employed consisted of a diluent (light and heavy paraffin), a surfactant (Span 80), and an extractant (Alamine 336), and sodium carbonate was used as the stripping solution. Initially, the ELM process parameters were optimized by using synthetic leach liquor as the feed phase. The role of the acidic feed-phase pH, which enhances the cotransport of H+ ions along with uranium inside the emulsion globules, was found to be significant, as it helped in achieving the complete extraction and stripping of uranium. The best optimized parameters were directly used for the separation and concentration of uranium from industrial leach solutions. In one step, in the presence of various metal ions, the selective permeation of uranyl ions through the liquid membrane was observed to be greater than 90%, and the concentration of uranium inside the strip phase was observed to be nearly 7 times higher. Separation factors of uranium with respect to Fe, Mg, Ca, and Mn were experimentally found to be 129, 781, 43, and 1462, respectively, in 12 min. Finally, application of the process in uranium ore processing is demonstrated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800819q

Mass transport modeling of Cs (I) through hollowfiber supported liquid membrane containing calix - [4] - bis(2,3 - naptho) - crown - 6 as the mobile carrier / P. Kandwal in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.110-116 Titre : Mass transport modeling of Cs (I) through hollowfiber supported liquid membrane containing calix - [4] - bis(2,3 - naptho) - crown - 6 as the mobile carrier Type de document : texte imprimé Auteurs : P. Kandwal, Auteur ; S. Dixit, Auteur ; S. Mukhopadhyay, Auteur Année de publication : 2012 Article en page(s) : pp.110-116 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Hollow  fiber  Liquid  membrane  Cesium  Calix-crown  Waste  management Résumé : A mathematical model is developed for the transport of cesium through hollowfibersupportedliquidmembrane (HFSLM) containingcalix-[4]-bis(2,3-naptho)-crown-6 (CNC) as the carrier extractant in NPOE and n-dodecane mixture as diluent. The model is developed on the principle of facilitated diffusional transport mechanism with laminar flow inside the tubular region in the fiber with all the flow rate conditions. It predicts the rate of transport of cesium from feed solution under various experimental conditions and system compositions. Simultaneously, experiments were performed taking varying concentrations of cesium nitrate in 3 M HNO3 as the feed solution and distilled water as the strip and the cesium transport rates were measured. Both the results were plotted and a good level of agreement is seen between predicted and experimental data points. Similar studies were carried out as a function of carrier extractant concentration and varying feed and strip flow rates. Reasonable agreement between the experimental and predicted data suggested validity of the developed model. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010151 [article] Mass transport modeling of Cs (I) through hollowfiber supported liquid membrane containing calix - [4] - bis(2,3 - naptho) - crown - 6 as the mobile carrier [texte imprimé] / P. Kandwal, Auteur ; S. Dixit, Auteur ; S. Mukhopadhyay, Auteur . - 2012 . - pp.110-116. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.110-116 Mots-clés : Hollow  fiber  Liquid  membrane  Cesium  Calix-crown  Waste  management Résumé : A mathematical model is developed for the transport of cesium through hollowfibersupportedliquidmembrane (HFSLM) containingcalix-[4]-bis(2,3-naptho)-crown-6 (CNC) as the carrier extractant in NPOE and n-dodecane mixture as diluent. The model is developed on the principle of facilitated diffusional transport mechanism with laminar flow inside the tubular region in the fiber with all the flow rate conditions. It predicts the rate of transport of cesium from feed solution under various experimental conditions and system compositions. Simultaneously, experiments were performed taking varying concentrations of cesium nitrate in 3 M HNO3 as the feed solution and distilled water as the strip and the cesium transport rates were measured. Both the results were plotted and a good level of agreement is seen between predicted and experimental data points. Similar studies were carried out as a function of carrier extractant concentration and varying feed and strip flow rates. Reasonable agreement between the experimental and predicted data suggested validity of the developed model. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711010151