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Substituent effects in kaolinite flotation using dodecyl tertiary amines / Changmiao Liu in Minerals engineering, Vol. 22 N° 9/10 (Août/Septembre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 849–852 Titre : Substituent effects in kaolinite flotation using dodecyl tertiary amines Type de document : texte imprimé Auteurs : Changmiao Liu, Auteur ; Yuehua Hu, Auteur ; Xuefeng Cao, Auteur Année de publication : 2009 Article en page(s) : pp. 849–852 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  collectors  Oxide  ores  Froth  flotation Résumé : The flotation behavior of kaolinite was investigated using a series of tertiary amines (DRN, DEN, DPN and DBN). Maximum recoveries of kaolinite were 93%, 88% and 84% for DEN, DPN and DRN, respectively. The recovery for DBN was very low. On the basis of the Zeta potential and FT-IR spectra, the ionization of surface hydroxyl and the isomorphic exchange of surface ions accounts for the charging mechanisms of the kaolinite surface. The adsorption mechanism of tertiary amines onto the kaolinite surface was mainly electrostatic. We determined that the IEP of kaolinite increased from 3.4 to higher values after the interaction of kaolinite with the four tertiary amines. FT-IR spectra of kaolinite changed to include sharp peaks of tertiary amines. Inductive electronic effects and space-steric effects of –CH3, –C2H5, –C3H7 and –C7H7 bound to the N atom result in different collecting powers for the four tertiary amines. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000739 [article] Substituent effects in kaolinite flotation using dodecyl tertiary amines [texte imprimé] / Changmiao Liu, Auteur ; Yuehua Hu, Auteur ; Xuefeng Cao, Auteur . - 2009 . - pp. 849–852. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 849–852 Mots-clés : Flotation  collectors  Oxide  ores  Froth  flotation Résumé : The flotation behavior of kaolinite was investigated using a series of tertiary amines (DRN, DEN, DPN and DBN). Maximum recoveries of kaolinite were 93%, 88% and 84% for DEN, DPN and DRN, respectively. The recovery for DBN was very low. On the basis of the Zeta potential and FT-IR spectra, the ionization of surface hydroxyl and the isomorphic exchange of surface ions accounts for the charging mechanisms of the kaolinite surface. The adsorption mechanism of tertiary amines onto the kaolinite surface was mainly electrostatic. We determined that the IEP of kaolinite increased from 3.4 to higher values after the interaction of kaolinite with the four tertiary amines. FT-IR spectra of kaolinite changed to include sharp peaks of tertiary amines. Inductive electronic effects and space-steric effects of –CH3, –C2H5, –C3H7 and –C7H7 bound to the N atom result in different collecting powers for the four tertiary amines. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000739