Micro-bubble size distribution measurements by laser diffraction technique / Hudson J. B. Couto in Minerals engineering, Vol. 22 N° 4 (Mars 2009)  

Public ISBD [article]  inMinerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 330–335 Titre : Micro-bubble size distribution measurements by laser diffraction technique Type de document : texte imprimé Auteurs : Hudson J. B. Couto, Auteur ; Daniel G. Nunes, Auteur ; Reiner Neumann, Auteur Année de publication : 2009 Article en page(s) : pp. 330–335 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation bubbles Sizing reagents Shear forces Environmental Index. décimale : 622 Industrie minière Résumé : The size distribution of microbubbles generated for the dissolved air flotation process could be assessed on a fast and reliable way by the application of laser diffraction technique. The bubble generation step could therefore be optimized, in order to decrease the size of the bubbles. Increasing air saturation pressure had a positive effect on bubble size, up to 400 kPa; higher pressures, however, had no effect. Surfactants (Flotigam and sodium oleate) significantly inhibited bubble coalescence, and higher concentrations of the reagents decrease the bubble size distribution, up to the critical micelle concentration. The mode of conditioning also had an important effect on bubble size improvement, by adding the surfactant into the pressure vessel. Overall median bubble size decreased 35% over the size distribution obtained without addition of reagent and conditioning. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002355 [article] Micro-bubble size distribution measurements by laser diffraction technique [texte imprimé] / Hudson J. B. Couto, Auteur ; Daniel G. Nunes, Auteur ; Reiner Neumann, Auteur . - 2009 . - pp. 330–335. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 330–335 Mots-clés : Flotation bubbles Sizing reagents Shear forces Environmental Index. décimale : 622 Industrie minière Résumé : The size distribution of microbubbles generated for the dissolved air flotation process could be assessed on a fast and reliable way by the application of laser diffraction technique. The bubble generation step could therefore be optimized, in order to decrease the size of the bubbles. Increasing air saturation pressure had a positive effect on bubble size, up to 400 kPa; higher pressures, however, had no effect. Surfactants (Flotigam and sodium oleate) significantly inhibited bubble coalescence, and higher concentrations of the reagents decrease the bubble size distribution, up to the critical micelle concentration. The mode of conditioning also had an important effect on bubble size improvement, by adding the surfactant into the pressure vessel. Overall median bubble size decreased 35% over the size distribution obtained without addition of reagent and conditioning. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002355

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