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Effect of Leptospirillum ferrooxidans on the flotation kinetics of sulphide ores / E.T. Pecina in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 462–468 Titre : Effect of Leptospirillum ferrooxidans on the flotation kinetics of sulphide ores Type de document : texte imprimé Auteurs : E.T. Pecina, Auteur ; M. Rodríguez, Auteur ; P. Castillo, Auteur Année de publication : 2009 Article en page(s) : pp. 462–468 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide  ores  Biotechnology  Froth  flotation  Flotation  kinetics Résumé : The objective of this work was to determine the effect of Leptospirillum ferrooxidans on the floatability of chalcopyrite, sphalerite, and pyrrhotite by using xanthate as a collector. The tests were carried out in the absence and presence of bacteria in relation to the type of ore and contact time with bacteria. The results indicate that the chalcopyrite flotation rate significantly increased in the presence of L. ferrooxidans due to the formation of hydrophobic species. The bacteria function as a weak depressant for pyrrhotite after a conditioning time ⩾60 min. The behaviour of sphalerite remains without changes due to its low susceptibility to oxidation. It was concluded that L. ferrooxidans brings about superficial changes mainly due to the oxidation of minerals. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002859 [article] Effect of Leptospirillum ferrooxidans on the flotation kinetics of sulphide ores [texte imprimé] / E.T. Pecina, Auteur ; M. Rodríguez, Auteur ; P. Castillo, Auteur . - 2009 . - pp. 462–468. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 462–468 Mots-clés : Sulphide  ores  Biotechnology  Froth  flotation  Flotation  kinetics Résumé : The objective of this work was to determine the effect of Leptospirillum ferrooxidans on the floatability of chalcopyrite, sphalerite, and pyrrhotite by using xanthate as a collector. The tests were carried out in the absence and presence of bacteria in relation to the type of ore and contact time with bacteria. The results indicate that the chalcopyrite flotation rate significantly increased in the presence of L. ferrooxidans due to the formation of hydrophobic species. The bacteria function as a weak depressant for pyrrhotite after a conditioning time ⩾60 min. The behaviour of sphalerite remains without changes due to its low susceptibility to oxidation. It was concluded that L. ferrooxidans brings about superficial changes mainly due to the oxidation of minerals. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002859