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Surface chemistry features in the flotation of KCl / Qinbo Cao in Minerals engineering, Vol. 23 N° 5 (Avril 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 365–373 Titre : Surface chemistry features in the flotation of KCl Type de document : texte imprimé Auteurs : Qinbo Cao, Auteur ; Hao Du, Auteur ; Jan D. Miller, Auteur Année de publication : 2011 Article en page(s) : pp. 365–373 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : KCl  flotation  Contact  angle  Adsorption  Molecular  dynamics  simulation Résumé : Despite the successful industrial practice to recover KCl by flotation, the adsorption state of collectors at KCl salt surfaces is still not fully understood. In this paper, the flotation behavior of KCl and NaCl using different collectors and captive bubble contact angle measurements at KCl and NaCl crystal surfaces in their saturated solutions are reported. The influence of collector concentration and collector structure is considered. The results show that both cationic and anionic collectors produce a hydrophobic state at the structure breaking KCl salt surface, with finite contact angle values of between 30° and 60°. In contrast, the contact angle at the structure making NaCl salt surface is zero at all collector concentrations, suggesting that no collector adsorption occurs, a supposition that is supported by results from molecular dynamics simulation (MDS). Further, it appears that the presence of surface defects such as edges and corners promote the adsorption of collectors at the KCl surface, and that the flotation is achieved by bubble attachment at the edges/corners of KCl particles with the formation of aeroflocs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900288X [article] Surface chemistry features in the flotation of KCl [texte imprimé] / Qinbo Cao, Auteur ; Hao Du, Auteur ; Jan D. Miller, Auteur . - 2011 . - pp. 365–373. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 365–373 Mots-clés : KCl  flotation  Contact  angle  Adsorption  Molecular  dynamics  simulation Résumé : Despite the successful industrial practice to recover KCl by flotation, the adsorption state of collectors at KCl salt surfaces is still not fully understood. In this paper, the flotation behavior of KCl and NaCl using different collectors and captive bubble contact angle measurements at KCl and NaCl crystal surfaces in their saturated solutions are reported. The influence of collector concentration and collector structure is considered. The results show that both cationic and anionic collectors produce a hydrophobic state at the structure breaking KCl salt surface, with finite contact angle values of between 30° and 60°. In contrast, the contact angle at the structure making NaCl salt surface is zero at all collector concentrations, suggesting that no collector adsorption occurs, a supposition that is supported by results from molecular dynamics simulation (MDS). Further, it appears that the presence of surface defects such as edges and corners promote the adsorption of collectors at the KCl surface, and that the flotation is achieved by bubble attachment at the edges/corners of KCl particles with the formation of aeroflocs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900288X