The Viscosity of Suspensions of Bentonite(Clays in Industry,Proceedings of the 13^<th> International Clay Conference)

概要

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The clay particle morphologies in dilute aqueous suspensions of swelling clay minerals such as smectites using rheological techniques have previously been evaluated by applying Einstein's or Robinson's Newtonian equation, because there is little or no interaction between the particles in the system. However for typical industrial aqueous suspensions of bentonite these equations are not applicable, because the suspensions are non-Newtonian, i.e., plastic, in flow behavior and have an additional shear stress due to the particle interaction. The relation between the shear stress, τ, and shear rate, σ, is described by the equation τ=η_2σ+a Inσ+b. In this equation, the first term, i.e., the Newtonian term, is ascribable to hydrodynamic effects. The second and third terms are shear stress due to exclusively breaking and reforming the particle interactions. Thus Robinson's equation was applied to the plastic viscosity or the Casson viscosity of industrial bentonite suspension at high concentrations, and the effective volume of the particles was presented. Then the effective volume was compared with each specific volume at the liquid limit and the swelling power.
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