Influence of Added Electrolyte KCl Concentration on Dispersion of Almina Aqueous Slurry
Osamu TAKAGI, Kazuyuki YOGO, Masakuni OZAWA and Suguru SUZUKI
Abstract:The influence of the added electrolyte KCl concentration was investigated on the dispersion of alumina particles in the alumina aqueous slurries. In the present work, the viscosities and the colloidal vibration potentials (CVP) were measured as a function of electrolyte KCl concentration in the range of 0 to 2000mmoldm|3 at the fixed concentrations of alumina (10mass%) and dispersant (0.5mass%) in the aqueous slurries. The viscosities of all slurries decreased with increasing the shear rate, so called the shear-thinning behavior was shown, and this behavior became vivid in more than 200 mmoldm|3. The yield stresses obtained from the@measured viscosities increased rapidly in more than 200 mmoldm|3, too. The CVPs approached to 0V in more than 200 mmoldm|3 of electrolyte KCl concentration. The particle size distribution shifted to the larger radius side more than 200 mmoldm|3. From the results mentioned above, it is considered that the agglomeration occurred in more than 200 mmoldm|3@with electrolyte KCl concentrations in the present alumina aqueous slurry. Key Words:Colloidal vibration potential, Viscosity, -potential, Electrolyte