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Evaluation of models for air recovery in a laboratory flotation column / R.H. Estrada-Ruiz in Minerals engineering, Vol. 22 N° 14 (Novembre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 14 (Novembre 2009) . - pp. 1193–1199 Titre : Evaluation of models for air recovery in a laboratory flotation column Type de document : texte imprimé Auteurs : R.H. Estrada-Ruiz, Auteur ; R. Pérez-Garibay, Auteur Année de publication : 2009 Article en page(s) : pp. 1193–1199 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Column  flotation  Flotation  froths  Flotation  bubbles  Froth  flotation Résumé : One of the more interesting recent topics in flotation modelling is the association between the fraction of air that overflows to the concentrate as unbroken bubbles (air recovery, α) and concentrate recovery. This paper analyses several models to estimate air recovery. These models were tested using experimental data obtained with a laboratory flotation column (2 m high; 0.095 m diam.), which was used to float sphalerite. Predictions from these models were compared with the results obtained by image analysis. The aim of this last technique was to have a reference measurement, quantifying by visual detection (manual method) the bubbles bursting on the surface. Based on the experimental results, the best models were identified. This kind of comparison is valuable for simulator developers. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001526 [article] Evaluation of models for air recovery in a laboratory flotation column [texte imprimé] / R.H. Estrada-Ruiz, Auteur ; R. Pérez-Garibay, Auteur . - 2009 . - pp. 1193–1199. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 14 (Novembre 2009) . - pp. 1193–1199 Mots-clés : Column  flotation  Flotation  froths  Flotation  bubbles  Froth  flotation Résumé : One of the more interesting recent topics in flotation modelling is the association between the fraction of air that overflows to the concentrate as unbroken bubbles (air recovery, α) and concentrate recovery. This paper analyses several models to estimate air recovery. These models were tested using experimental data obtained with a laboratory flotation column (2 m high; 0.095 m diam.), which was used to float sphalerite. Predictions from these models were compared with the results obtained by image analysis. The aim of this last technique was to have a reference measurement, quantifying by visual detection (manual method) the bubbles bursting on the surface. Based on the experimental results, the best models were identified. This kind of comparison is valuable for simulator developers. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001526

Relationship between the bubble surface flux that overflows and the mass flow rate of solids in the concentrate of flotation processes / R. Pérez-Garibay in Minerals engineering, Vol. 23 N° 7 (Juin 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 7 (Juin 2010) . - pp. 541–548 Titre : Relationship between the bubble surface flux that overflows and the mass flow rate of solids in the concentrate of flotation processes Type de document : texte imprimé Auteurs : R. Pérez-Garibay, Auteur ; R.H. Estrada-Ruiz, Auteur ; P. M. Gallegos-Acevedo, Auteur Année de publication : 2011 Article en page(s) : pp. 541–548 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Column  flotation  Flotation  froths  Flotation  bubbles  Mass  balancing Résumé : This paper presents the relationship between the bubble surface flux that overflows and the mass flow rate of solids in the concentrate. Even though this study was carried out in a flotation column, the knowledge derived from this paper may be applied to all froth flotation processes. The experimental set up was equipped with an image analysis system to estimate the froth bubble diameter and the air recovery. This study describes the difference between the bubble surface flux entering the froth zone (SbI) and the flux that arrives to the top of the froth (SbT) and then overflows to the concentrate (SbO), the latter being most directly related to the mass flow rate of solids in the concentrate. It was observed that the superficial area of the overflow increased with increasing collector addition and air flow rate, but decreased with increasing froth depth and particle size distribution. Visual evidence and experimental results suggest that, it is common that the superficial area of air that overflows in the concentrate is covered by particles. Only when this condition is almost achieved does overflows occur; otherwise, a high level of coalescence and bubble bursting take place at the froth surface. This was concluded after finding compatible trends between the estimated and predicted mass flow rates of solids in the concentrate, when a tractable geometrical model was used (R2 = 0.8). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003057 [article] Relationship between the bubble surface flux that overflows and the mass flow rate of solids in the concentrate of flotation processes [texte imprimé] / R. Pérez-Garibay, Auteur ; R.H. Estrada-Ruiz, Auteur ; P. M. Gallegos-Acevedo, Auteur . - 2011 . - pp. 541–548. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 7 (Juin 2010) . - pp. 541–548 Mots-clés : Column  flotation  Flotation  froths  Flotation  bubbles  Mass  balancing Résumé : This paper presents the relationship between the bubble surface flux that overflows and the mass flow rate of solids in the concentrate. Even though this study was carried out in a flotation column, the knowledge derived from this paper may be applied to all froth flotation processes. The experimental set up was equipped with an image analysis system to estimate the froth bubble diameter and the air recovery. This study describes the difference between the bubble surface flux entering the froth zone (SbI) and the flux that arrives to the top of the froth (SbT) and then overflows to the concentrate (SbO), the latter being most directly related to the mass flow rate of solids in the concentrate. It was observed that the superficial area of the overflow increased with increasing collector addition and air flow rate, but decreased with increasing froth depth and particle size distribution. Visual evidence and experimental results suggest that, it is common that the superficial area of air that overflows in the concentrate is covered by particles. Only when this condition is almost achieved does overflows occur; otherwise, a high level of coalescence and bubble bursting take place at the froth surface. This was concluded after finding compatible trends between the estimated and predicted mass flow rates of solids in the concentrate, when a tractable geometrical model was used (R2 = 0.8). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003057