Selective depression of diaspore with waxy maize starch / Haipu Li in Minerals engineering, Vol. 23 N° 15 (Décembre 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1192–1197 Titre : Selective depression of diaspore with waxy maize starch Type de document : texte imprimé Auteurs : Haipu Li, Auteur ; Shasha Zhang, Auteur ; Hao Jiang, Auteur Année de publication : 2011 Article en page(s) : pp. 1192–1197 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Diasporic bauxite Reverse flotation Selective depression Waxy maize starch Résumé : Highly branched waxy maize starch (WMS) was used to separate diaspore from artificial mixtures of diaspore and kaolinite by microflotation using dodecylamine (DDA) as collector. It was found that WMS depressed the diaspore flotation while activated the kaolinite flotation more or less. The adsorption of WMS on diaspore was examined through adsorption test, zeta potential measurement, infrared spectroscopy, and atomic force microscopy. It is suggested that both chemical interaction and intermolecular hydrogen bonding by hydroxyl groups of starch with surface Al–OH moieties occurred in the adsorption. Results obtained from the adsorption of DDA and WMS on diaspore showed that starch virtually enhanced the DDA adsorption. The depressant action of WMS can be rationalized primarily by the formation of hydrophilic adsorption layer enveloping the surface of diaspore and covering the collector. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510002013 [article] Selective depression of diaspore with waxy maize starch [texte imprimé] / Haipu Li, Auteur ; Shasha Zhang, Auteur ; Hao Jiang, Auteur . - 2011 . - pp. 1192–1197. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 15 (Décembre 2010) . - pp. 1192–1197 Mots-clés : Diasporic bauxite Reverse flotation Selective depression Waxy maize starch Résumé : Highly branched waxy maize starch (WMS) was used to separate diaspore from artificial mixtures of diaspore and kaolinite by microflotation using dodecylamine (DDA) as collector. It was found that WMS depressed the diaspore flotation while activated the kaolinite flotation more or less. The adsorption of WMS on diaspore was examined through adsorption test, zeta potential measurement, infrared spectroscopy, and atomic force microscopy. It is suggested that both chemical interaction and intermolecular hydrogen bonding by hydroxyl groups of starch with surface Al–OH moieties occurred in the adsorption. Results obtained from the adsorption of DDA and WMS on diaspore showed that starch virtually enhanced the DDA adsorption. The depressant action of WMS can be rationalized primarily by the formation of hydrophilic adsorption layer enveloping the surface of diaspore and covering the collector. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510002013

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