Documents disponibles écrits par cet auteur

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

Kinetic comparison of biological and conventional flotation of coal / E. Amini in Minerals engineering, Vol. 22 N° 4 (Mars 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 344–347 Titre : Kinetic comparison of biological and conventional flotation of coal Type de document : texte imprimé Auteurs : E. Amini, Auteur ; M. Oliazadeh, Auteur ; M. Kolahdoozan, Auteur Année de publication : 2009 Article en page(s) : pp. 344–347 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  Kinetics  Bioflotation  Selectivity  Separation  Tabas  coal Résumé : Froth flotation is commonly used in coal processing to selectively recover the organic material (coal) from inorganic waste material. Tabas coal, located in east Iran, contains fine disseminated pyrite which is floated with coal during flotation, and hence decreasing the quality of the final concentrate. Reagents, such as sodium cyanide, are typically added to depress pyrite. Due to the toxicity of cyanide, alternative strategies for depressing pyrite flotation are being investigated. In this paper the metallurgical performance of Tabas coal treated with sodium cyanide is compared to that of Tabas coal which has undergone bacterial treatment using Acidithiobacillus ferrooxidans. Results indicate that bacterial treatment decreases the flotation rate of pyrite and improves the selectivity between coal and gangue. The possibility of using bacteria in place of toxic chemicals such as cyanide has significant environmental benefit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002380 [article] Kinetic comparison of biological and conventional flotation of coal [texte imprimé] / E. Amini, Auteur ; M. Oliazadeh, Auteur ; M. Kolahdoozan, Auteur . - 2009 . - pp. 344–347. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 344–347 Mots-clés : Flotation  Kinetics  Bioflotation  Selectivity  Separation  Tabas  coal Résumé : Froth flotation is commonly used in coal processing to selectively recover the organic material (coal) from inorganic waste material. Tabas coal, located in east Iran, contains fine disseminated pyrite which is floated with coal during flotation, and hence decreasing the quality of the final concentrate. Reagents, such as sodium cyanide, are typically added to depress pyrite. Due to the toxicity of cyanide, alternative strategies for depressing pyrite flotation are being investigated. In this paper the metallurgical performance of Tabas coal treated with sodium cyanide is compared to that of Tabas coal which has undergone bacterial treatment using Acidithiobacillus ferrooxidans. Results indicate that bacterial treatment decreases the flotation rate of pyrite and improves the selectivity between coal and gangue. The possibility of using bacteria in place of toxic chemicals such as cyanide has significant environmental benefit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002380

Use of frother with sampling-for-imaging bubble sizing technique / W. Zhang in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 513–515 Titre : Use of frother with sampling-for-imaging bubble sizing technique Type de document : texte imprimé Auteurs : W. Zhang, Auteur ; M. Kolahdoozan, Auteur ; J.E. Nesset, Auteur Année de publication : 2009 Article en page(s) : pp. 513–515 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  frothers  Flotation  bubbles  Flotation  machines Résumé : Measurement of bubble size in industrial flotation cells is now often accomplished using the sampling-for-imaging technique. Operation calls for frother in the viewing chamber. In this communication the impact of frother concentration in the chamber is examined. A concentration in excess of the system CCC (critical coalescence concentration) is recommended for field work. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002732 [article] Use of frother with sampling-for-imaging bubble sizing technique [texte imprimé] / W. Zhang, Auteur ; M. Kolahdoozan, Auteur ; J.E. Nesset, Auteur . - 2009 . - pp. 513–515. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 513–515 Mots-clés : Flotation  frothers  Flotation  bubbles  Flotation  machines Résumé : Measurement of bubble size in industrial flotation cells is now often accomplished using the sampling-for-imaging technique. Operation calls for frother in the viewing chamber. In this communication the impact of frother concentration in the chamber is examined. A concentration in excess of the system CCC (critical coalescence concentration) is recommended for field work. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002732