Effect of Interparticle Potentials and Sedimentation on Particle Packing Density of Bimodal Particle Distributions During Pressure Filtration

Abstract

Effect of interparticle forces, bimodal particle size distribution, and slurry viscosity on particle packing in alumina bodies consolidated by pressure filtration is presented. The requirements for packing colloidal particles to their highest density are strong repulsive interparticle forces and optimum particle size distribution. Even though these conditions are met, the high packing density in consolidated bodies may be adversely affected by particle segregation resulting from sedimentation. Therefore, the slurry during consolidation must have a sufficiently high viscosity to prevent sedimentation. [

Mineral-Content and Particle-Size Effects on the Colloidal Properties of Concentrated Lateritic Suspensions

“…As expected, the shear stress is always greater for the colloidal fraction, the effect being more pronounced as the solid concentration increases. This behavior was shown in samples G and GS (data not shown), and it was observed previously in alumina suspensions (Velamakanni and Lange, 1991), and strongly flocculated clay systems (Buscall et al, 1987). Figure 7 shows the evolution of the apparent viscosity (~ = 500 s 1) with solid concentration for bulk samples at pH = 6.0 • 0.3, a value commonly found in industrial processes.…”

Shaped Coarse Grained Refractories by Pressure Slip Casting

“…Based on the high solid content of the coarse granular slips and the hindered particle movement in the coarse granular cake structure, segregation mechanisms at the interface of cake and suspension are inapplicable. [42][43][44][45] Due to wall friction the slip velocity and therefore the shear rate is close to zero at the tube inner surface. Thus, the effective inner tube diameter decreases and causes blockage if the yield stress viscosity is too high and the shear stress close to the tube inner surface is insufficient to transcend the yield stress, Figure 7.…”

Consolidation of nanoparticle suspensions by centrifugation in non-porous moulds

“…A more suitable approach to overcoming the particle size separation problem utilises highly concentrated dispersed suspensions. The mass segregation can be avoided by hindered sedimentation in these high-solid-content suspensions [10,11]. It has been reported that even phase segregation in a composite system Al 2 O 3 /ZrO 2 could be successfully avoided using a concentrated suspension [12].…”