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 [...]

Froth zone characterization of an industrial flotation column in rougher circuit / M. Massinaei in Minerals engineering, Vol. 22 N° 3 (Fevrier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 272–278 Titre : Froth zone characterization of an industrial flotation column in rougher circuit Type de document : texte imprimé Auteurs : M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur Année de publication : 2009 Article en page(s) : pp. 272–278 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines  Modeling Index. décimale : 622 Industrie minière Résumé : In this investigation the froth zone of an industrial column (4 m “diameter” × 12 m “height”) in rougher circuit was characterized. Experiments were carried out at Miduk copper concentrator, Iran. Miduk is a unique copper processing plant which utilizes columns in rougher circuit. Cleaning and selectivity actions in the rougher froth were illustrated using solids and grade profiles along with RTD data. The impact of froth depth (FD) on overall rate constant (k) and k–Sb relationship was evaluated. Dependency of overall flotation kinetics on froth depth and gas velocity (Jg) was modeled by k = 4.97(FD)−0.87(Jg)0.80. Froth recovery (Rf) was estimated and modeled in terms of froth residence time of slurry (FRTSlurry) as Rf = Rf,maxexp(−k × FRTSlurry). Finally, the correlation between k, Sb (indicative of the collection zone performance) and FRTSlurry (indicative of the froth zone performance) was modeled by k = 0.02 (FRTSlurry)−0.62(Sb)0.82. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002045 [article] Froth zone characterization of an industrial flotation column in rougher circuit [texte imprimé] / M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur . - 2009 . - pp. 272–278. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 3 (Fevrier 2009) . - pp. 272–278 Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines  Modeling Index. décimale : 622 Industrie minière Résumé : In this investigation the froth zone of an industrial column (4 m “diameter” × 12 m “height”) in rougher circuit was characterized. Experiments were carried out at Miduk copper concentrator, Iran. Miduk is a unique copper processing plant which utilizes columns in rougher circuit. Cleaning and selectivity actions in the rougher froth were illustrated using solids and grade profiles along with RTD data. The impact of froth depth (FD) on overall rate constant (k) and k–Sb relationship was evaluated. Dependency of overall flotation kinetics on froth depth and gas velocity (Jg) was modeled by k = 4.97(FD)−0.87(Jg)0.80. Froth recovery (Rf) was estimated and modeled in terms of froth residence time of slurry (FRTSlurry) as Rf = Rf,maxexp(−k × FRTSlurry). Finally, the correlation between k, Sb (indicative of the collection zone performance) and FRTSlurry (indicative of the froth zone performance) was modeled by k = 0.02 (FRTSlurry)−0.62(Sb)0.82. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002045

Hydrodynamic and kinetic characterization of industrial columns in rougher circuit / M. Massinaei in Minerals engineering, Vol. 22 N° 4 (Mars 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 357–365 Titre : Hydrodynamic and kinetic characterization of industrial columns in rougher circuit Type de document : texte imprimé Auteurs : M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur Année de publication : 2009 Article en page(s) : pp. 357–365 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Résumé : In the present investigation the relationship between collection zone rate constant (kc) and gas dispersion parameters, viz. bubble size (db), superficial gas velocity (Jg), gas hold-up (εg) and bubble surface area flux (Sb) was evaluated. Experiments were conducted in an industrial (4 m in diameter and 12 m high) and a pilot (0.1 m in diameter and 4 m high) flotation column in rougher circuit at Miduk copper concentrator in Iran. Gas hold-up was measured using pressure difference technique and mean bubble sizes were estimated from a drift flux analysis. It was found that the collection zone rate constant was not correlated with db and Jg solely but was linearly dependent on εg and Sb for the range of interest. Collection efficiency (Ek) and floatability factor (P) in the industrial columns were quantified (Ek = 3.1%; P = 7.7 × 10−3). The influence of operating parameters comprising superficial gas velocity, slurry solids% and frother dosage/type on Sb and flotation kinetics was discussed. Analysis of available industrial data suggested that Sb and εg were related by Sb = 4.46εg over the range 30 < Sb < 60 s−1 and 7% < εg < 14%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002422 [article] Hydrodynamic and kinetic characterization of industrial columns in rougher circuit [texte imprimé] / M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur . - 2009 . - pp. 357–365. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 357–365 Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Résumé : In the present investigation the relationship between collection zone rate constant (kc) and gas dispersion parameters, viz. bubble size (db), superficial gas velocity (Jg), gas hold-up (εg) and bubble surface area flux (Sb) was evaluated. Experiments were conducted in an industrial (4 m in diameter and 12 m high) and a pilot (0.1 m in diameter and 4 m high) flotation column in rougher circuit at Miduk copper concentrator in Iran. Gas hold-up was measured using pressure difference technique and mean bubble sizes were estimated from a drift flux analysis. It was found that the collection zone rate constant was not correlated with db and Jg solely but was linearly dependent on εg and Sb for the range of interest. Collection efficiency (Ek) and floatability factor (P) in the industrial columns were quantified (Ek = 3.1%; P = 7.7 × 10−3). The influence of operating parameters comprising superficial gas velocity, slurry solids% and frother dosage/type on Sb and flotation kinetics was discussed. Analysis of available industrial data suggested that Sb and εg were related by Sb = 4.46εg over the range 30 < Sb < 60 s−1 and 7% < εg < 14%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002422

Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit / M. Massinaei in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 96–99 Titre : Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit Type de document : texte imprimé Auteurs : M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur Année de publication : 2009 Article en page(s) : pp. 96–99 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Index. décimale : 622 Industrie minière Résumé : In this investigation, a pilot-scale flotation column was successfully designed, installed and tested in rougher circuit of the Miduk copper concentrator, Iran. The axial dispersion model was employed in the design procedure. Collection zone rate constant (kc) along with the target recovery of over 75% was used to size the column. The rate constant kc was determined based on a number of pilot and industrial experiments. Performance of the pilot column was compared with existing full-scale Microcel columns in a number of parallel experiments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000484 [article] Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit [texte imprimé] / M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur . - 2009 . - pp. 96–99. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 96–99 Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Index. décimale : 622 Industrie minière Résumé : In this investigation, a pilot-scale flotation column was successfully designed, installed and tested in rougher circuit of the Miduk copper concentrator, Iran. The axial dispersion model was employed in the design procedure. Collection zone rate constant (kc) along with the target recovery of over 75% was used to size the column. The rate constant kc was determined based on a number of pilot and industrial experiments. Performance of the pilot column was compared with existing full-scale Microcel columns in a number of parallel experiments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000484