The dispersive effect of sodium silicate on kaolinite particles in process water : Implications for iron-ore processing
Ma, Mark (CSIRO Process Science and Engineering)

Fecha:	2011
Resumen:	Kaolinite is a common gangue mineral in iron ore and sodium silicate has been used widely as a dispersant of silicate gangue minerals including kaolinite in various iron-ore flotation methods over a wide range of pH. Its actual dispersive effect on kaolinite under iron-ore flotation conditions has received very limited attention, however. The presence of hydrolyzable metal cations in process water further complicates sodium silicate-kaolinite interactions. In the present study, the dispersive effect of sodium silicate on kaolinite particles in distilled water as well as in CaCl and MgCl solutions was investigated systematically through electrophoretic mobility and colloid-stability studies. The studies were based on controlled pH, which eliminated the dispersive effect of sodium silicate induced by increasingpulp pH, in order to simulate the conditions of iron-ore processing. With pH controlled at constant levels, sodium silicate dispersed kaolinite only when positively charged sites were present on kaolinite surfaces and the zeta potential of kaolinite was more negative than ~-30 mV. Over the pH range from 5 to 10. 5, a significant dispersive effect of sodium silicate was only observed at pH 7. In process water, when Ca and Mgwere present, the strong coagulation of kaolinite particles caused by the hydrolyzable metal cations could not be dispersed effectively with sodium silicate.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Coagulation ; Kaolinite ; Sodium Silicate ; Zeta Potential
Publicado en:	Clays and Clay Minerals, Vol. 59, Núm. 3 (2011) , p. 233-239, ISSN 1552-8367

DOI: 10.1346/CCMN.2011.0590302

7 p, 442.4 KB  Acceso restringido a la UAB

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