Documents disponibles écrits par cet auteur

Depression of pyrite in the flotation of high pyrite low-grade lead–zinc ore using acidithiobacillus ferrooxidans / J. V. Mehrabani in Minerals engineering, Vol. 23 N° 1 (Janvier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 10-16 Titre : Depression of pyrite in the flotation of high pyrite low-grade lead–zinc ore using acidithiobacillus ferrooxidans Type de document : texte imprimé Auteurs : J. V. Mehrabani, Auteur ; M. Noaparast, Auteur ; S. M. Mousavi, Auteur Article en page(s) : pp. 10-16 Note générale : Génie Minier Métallurgie Langues : Anglais (eng) Mots-clés : Bacteria  Froth  flotation  Sulfide  ores  Sodium  cyanide  Process  optimization Index. décimale : 622 Industrie minière Résumé : In this research work, selective depression of pyrite in the flotation of a low-grade lead–zinc ore containing 31% pyrite was investigated in the absence and presence of Acidithiobacillus ferrooxidans. Pyrite was significantly depressed with these bacteria using the optimum dosage of reagents. Sphalerite recovery and Zn grade in the obtained sphalerite concentrate were both enhanced by bacteria. The results of bioflotation experiments showed that bacterial depression of pyrite is very sensitive to the concentration of other flotation reagents. Least significance difference (LSD) bars were used to study the significance of the factors under study with a confidence interval of 90%. Under similar conditions, A. ferrooxidans was seen to increase the Zn grade and separation efficiency more effectively than sodium cyanide. Flotation kinetic studies confirmed a considerable decrease in the pyrite kinetic rate constant in the presence of A. ferrooxidans. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...] [article] Depression of pyrite in the flotation of high pyrite low-grade lead–zinc ore using acidithiobacillus ferrooxidans [texte imprimé] / J. V. Mehrabani, Auteur ; M. Noaparast, Auteur ; S. M. Mousavi, Auteur . - pp. 10-16. Génie Minier Métallurgie Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 1 (Janvier 2010) . - pp. 10-16 Mots-clés : Bacteria  Froth  flotation  Sulfide  ores  Sodium  cyanide  Process  optimization Index. décimale : 622 Industrie minière Résumé : In this research work, selective depression of pyrite in the flotation of a low-grade lead–zinc ore containing 31% pyrite was investigated in the absence and presence of Acidithiobacillus ferrooxidans. Pyrite was significantly depressed with these bacteria using the optimum dosage of reagents. Sphalerite recovery and Zn grade in the obtained sphalerite concentrate were both enhanced by bacteria. The results of bioflotation experiments showed that bacterial depression of pyrite is very sensitive to the concentration of other flotation reagents. Least significance difference (LSD) bars were used to study the significance of the factors under study with a confidence interval of 90%. Under similar conditions, A. ferrooxidans was seen to increase the Zn grade and separation efficiency more effectively than sodium cyanide. Flotation kinetic studies confirmed a considerable decrease in the pyrite kinetic rate constant in the presence of A. ferrooxidans. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDR-4XDKC9K-1&_user=6 [...]

Modeling and simulation of sour gas membrane-absorption system: Influence of operational parameters on species removal / S. Mohebi in Journal of natural gas science and engineering, Vol. 1 N° 6 (Décembre 2009) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 1 N° 6 (Décembre 2009) . - pp. 195-204 Titre : Modeling and simulation of sour gas membrane-absorption system: Influence of operational parameters on species removal Type de document : texte imprimé Auteurs : S. Mohebi, Auteur ; S. M. Mousavi, Auteur ; S. Kiani, Auteur Article en page(s) : pp. 195-204 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Modeling  Simulation  Sweetening  Sour  gas  Membrane  Separation Index. décimale : 665.7 Résumé : Membrane-based gas separation process is an effective method for separation of species from gas mixtures. Combination of membrane process with other separation methods such as absorption is an appropriate method for gas separation. One of applications of hybrid systems of membrane–absorption is sour gas sweetening. In this paper, the hollow fiber membrane contactor and amine solution are used for separation of CO2 and H2S from CO2/H2S/CH4 gas mixture. Sour gas and amine solution enter the shell and fiber respectively. CO2 and H2S react with the amine solution. Reaction mechanism and equations for three phases of gas, liquid, and membrane are needed for modeling of this system. MATLAB software is used for simulation. The results show that concentrations of CO2 and H2S decrease in the beginning of the fiber. Liquid phase is controlling phase. Furthermore, pressure increase has a positive effect on separation. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...] [article] Modeling and simulation of sour gas membrane-absorption system: Influence of operational parameters on species removal [texte imprimé] / S. Mohebi, Auteur ; S. M. Mousavi, Auteur ; S. Kiani, Auteur . - pp. 195-204. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 1 N° 6 (Décembre 2009) . - pp. 195-204 Mots-clés : Modeling  Simulation  Sweetening  Sour  gas  Membrane  Separation Index. décimale : 665.7 Résumé : Membrane-based gas separation process is an effective method for separation of species from gas mixtures. Combination of membrane process with other separation methods such as absorption is an appropriate method for gas separation. One of applications of hybrid systems of membrane–absorption is sour gas sweetening. In this paper, the hollow fiber membrane contactor and amine solution are used for separation of CO2 and H2S from CO2/H2S/CH4 gas mixture. Sour gas and amine solution enter the shell and fiber respectively. CO2 and H2S react with the amine solution. Reaction mechanism and equations for three phases of gas, liquid, and membrane are needed for modeling of this system. MATLAB software is used for simulation. The results show that concentrations of CO2 and H2S decrease in the beginning of the fiber. Liquid phase is controlling phase. Furthermore, pressure increase has a positive effect on separation. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...]