Abstract
The particle dispersion in concentrated alumina aqueous slurry was investigated from colloidal vibration potential (CVP) and viscosity. In the present work, the CVPs of the slurry (40mass%) were measured by an ultra-sonic vibration method as a function of pH and the concentration of organic dispersants, and viscosities were measured with a rotating cylinder viscometer for the slullies containing 0.04-4mass% dispersant at pH 7. The CVP shifted to negative potential side with both increases in pH and the concentrain of dispersant in the range of 0.04-2mass%. The minimum viscosity appeared at with 2mass% dispersant. Moreover, it was found by an elemental analysis that the surface of alumina particles were saturated with dispersant molecules at about 2mass%. From the above mentioned, the CVP measurement thought to be effective in evaluating the particle dispersion in the concentrated alumina aqueous slurry.
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