Particle Shape Control by Rounding Irregular Shaped Particles

Effects of Particle Shapes on Fluidity of Pulverized Coal in CWM and Fly-ash Particles

Abstract

The shape of particles affects the flow resistance of slurry such as CWM (Coal Water Mixture) and cement slurry. If the particles are rounded, the slurry can maintain good fluidity due to a decrease in flow resistance.
In this study, effect on fluidity of rounding irregular shaped particles having sharp edges is investigated. The particles are fed into a gap between two rotary disks rotating at different speeds. Mutual rubbing of particles scrapes the sharp edges and makes them round in shape. The method is applicable to the production of high-density CWM consisting of ultrafine particles. Furthermore, the method is also suitable for producing rounded fly-ash particles.