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Extraction of indium from zinc plant residues / S. M. Javad Koleini in Minerals engineering, Vol. 23 N° 1 (Janvier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 51-53 Titre : Extraction of indium from zinc plant residues Type de document : texte imprimé Auteurs : S. M. Javad Koleini, Auteur ; Hossein Mehrpouya, Auteur ; Kamal Saberyan, Auteur Article en page(s) : pp. 51-53 Note générale : Génie Minier Métallurgie Langues : Anglais (eng) Mots-clés : Leaching  Reduction  Solvent  extraction  Cementation Index. décimale : 622 Industrie minière Résumé : The main purpose of this study was to extract indium from the Irankoh zinc plant residue. The Irankoh zinc plant residue contained 145 ppm indium. The optimum conditions for leaching of indium and reduction of ferric ion in reductive leaching were obtained at temperature of 90 °C for a leaching duration of 3 h with sulfuric acid concentration of 100 g/L and the amount of required sodium sulfide for reduction of ferric was 1.5 times of stoichiometric quantity of iron. Then, to prepare concentrated indium solution, indium was selectively precipitated from the leach solution. The pH of leach solution was adjusted to 6 with ammonia solution in 90 °C for selective indium precipitation, and reaction time was considered to be 10 min. Then the resulting precipitation was dissolved using hot sulfuric acid solution, and the solution was subject to solvent extraction and cementation using zinc powder to recover indium. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...] [article] Extraction of indium from zinc plant residues [texte imprimé] / S. M. Javad Koleini, Auteur ; Hossein Mehrpouya, Auteur ; Kamal Saberyan, Auteur . - pp. 51-53. Génie Minier Métallurgie Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 51-53 Mots-clés : Leaching  Reduction  Solvent  extraction  Cementation Index. décimale : 622 Industrie minière Résumé : The main purpose of this study was to extract indium from the Irankoh zinc plant residue. The Irankoh zinc plant residue contained 145 ppm indium. The optimum conditions for leaching of indium and reduction of ferric ion in reductive leaching were obtained at temperature of 90 °C for a leaching duration of 3 h with sulfuric acid concentration of 100 g/L and the amount of required sodium sulfide for reduction of ferric was 1.5 times of stoichiometric quantity of iron. Then, to prepare concentrated indium solution, indium was selectively precipitated from the leach solution. The pH of leach solution was adjusted to 6 with ammonia solution in 90 °C for selective indium precipitation, and reaction time was considered to be 10 min. Then the resulting precipitation was dissolved using hot sulfuric acid solution, and the solution was subject to solvent extraction and cementation using zinc powder to recover indium. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...]

Galvanic leaching of chalcopyrite in atmospheric pressure and sulfate media / S. M. Javad Koleini in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 5997–6002 Titre : Galvanic leaching of chalcopyrite in atmospheric pressure and sulfate media : kinetic and surface studies Type de document : texte imprimé Auteurs : S. M. Javad Koleini, Auteur ; M. Jafarian, Auteur ; M. Abdollahy, Auteur Année de publication : 2010 Article en page(s) : pp. 5997–6002 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Galvanic  leaching  Kinetic Résumé : Chalcopyrite leaching rate in atmospheric pressure and in sulfate media with ferric ion is low because of passive layer formation around chalcopyrite particles. In this investigation pyrite is used as a catalyst of chalcopyrite leaching. Because of galvanic interaction between chalcopyrite and pyrite, the chalcopyrite leaching rate is increased. Effects of parameters such as stirring speed, pyrite to chalcopyrite ratio, solution potential, temperature, and initial acid concentration were investigated. Results showed that maximum copper recovery (more than 95%) is obtained in less than 24 h, stirring speed of 1150 rpm, pyrite to chalcopyrite ratio 4, solution potential 410 mV, temperature 85 °C, and initial sulfuric acid concentration 45 g/L. Also, kinetic investigation showed that chalcopyrite dissolution in the presence of pyrite followed the shrinking core model and the reaction was controlled by the surface reaction. Activation energy (Ea) was calculated at 77.79 kJ/mol. Surface studies showed that in the absence of pyrite, the surface of chalcopyrite particles was covered by passive layer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100017u [article] Galvanic leaching of chalcopyrite in atmospheric pressure and sulfate media : kinetic and surface studies [texte imprimé] / S. M. Javad Koleini, Auteur ; M. Jafarian, Auteur ; M. Abdollahy, Auteur . - 2010 . - pp. 5997–6002. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 5997–6002 Mots-clés : Galvanic  leaching  Kinetic Résumé : Chalcopyrite leaching rate in atmospheric pressure and in sulfate media with ferric ion is low because of passive layer formation around chalcopyrite particles. In this investigation pyrite is used as a catalyst of chalcopyrite leaching. Because of galvanic interaction between chalcopyrite and pyrite, the chalcopyrite leaching rate is increased. Effects of parameters such as stirring speed, pyrite to chalcopyrite ratio, solution potential, temperature, and initial acid concentration were investigated. Results showed that maximum copper recovery (more than 95%) is obtained in less than 24 h, stirring speed of 1150 rpm, pyrite to chalcopyrite ratio 4, solution potential 410 mV, temperature 85 °C, and initial sulfuric acid concentration 45 g/L. Also, kinetic investigation showed that chalcopyrite dissolution in the presence of pyrite followed the shrinking core model and the reaction was controlled by the surface reaction. Activation energy (Ea) was calculated at 77.79 kJ/mol. Surface studies showed that in the absence of pyrite, the surface of chalcopyrite particles was covered by passive layer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100017u

The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment / B. Shahbazi in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 57–63 Titre : The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment Type de document : texte imprimé Auteurs : B. Shahbazi, Auteur ; B. Rezai, Auteur ; S. M. Javad Koleini, Auteur Année de publication : 2009 Article en page(s) : pp. 57–63 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  Coarse  particle  Dimensionless  parameters  Collision  Attachment Index. décimale : 622 Industrie minière Résumé : In this study the dependence of the impeller speed on the particle size variation was investigated on the quartz particles using laboratory mechanical flotation cell. Maximum recovery was obtained at 1100 rpm. For either more quiescent (impeller speed <900 rpm) or more turbulent (impeller speed >1300 rpm) conditions, flotation recovery decreased steadily. Furthermore, amount of collision probabilities is calculated using various equations. According to this study, maximum collision probability was obtained around 48.35% with impeller speed of 1100 rpm, air flow rate of 15 l/h and particle size of 545 μm and minimum collision probability was obtained around 2.43% with impeller speed of 700 rpm, air flow rate of 15 l/h and particle size of 256 μm. Maximum attachment probability was obtained around 44.16% with impeller speed of 1300 rpm, air flow rate of 75 l/h and particle size of 256 μm. With using some frothers such as poly propylene glycol, MIBC and pine oil, probability of collision increased, respectively. Maximum collision probability was obtained around 65.46% with poly propylene glycol dosage of 75 g/t and particle size of 545 μm. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000812 [article] The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment [texte imprimé] / B. Shahbazi, Auteur ; B. Rezai, Auteur ; S. M. Javad Koleini, Auteur . - 2009 . - pp. 57–63. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 57–63 Mots-clés : Flotation  Coarse  particle  Dimensionless  parameters  Collision  Attachment Index. décimale : 622 Industrie minière Résumé : In this study the dependence of the impeller speed on the particle size variation was investigated on the quartz particles using laboratory mechanical flotation cell. Maximum recovery was obtained at 1100 rpm. For either more quiescent (impeller speed <900 rpm) or more turbulent (impeller speed >1300 rpm) conditions, flotation recovery decreased steadily. Furthermore, amount of collision probabilities is calculated using various equations. According to this study, maximum collision probability was obtained around 48.35% with impeller speed of 1100 rpm, air flow rate of 15 l/h and particle size of 545 μm and minimum collision probability was obtained around 2.43% with impeller speed of 700 rpm, air flow rate of 15 l/h and particle size of 256 μm. Maximum attachment probability was obtained around 44.16% with impeller speed of 1300 rpm, air flow rate of 75 l/h and particle size of 256 μm. With using some frothers such as poly propylene glycol, MIBC and pine oil, probability of collision increased, respectively. Maximum collision probability was obtained around 65.46% with poly propylene glycol dosage of 75 g/t and particle size of 545 μm. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000812