WETTABILITY OF PACKED-BED OF SURFACE COMP OSITE FINE PARTICLES

A wettability measurement was conducted as one of the physicochemical properties of surface composite fine particles. The particles were pre pared by high-speed gas impact blending. To evaluate the wettability, the capillary rising velocity of water in a packed bed of composite fi ne particles was measured continuously by means of an electronic balan ce. This measurement is based on Washburn's theory on the penetration rate. The experimental results showed that the wettability of the pack ed bed increases with the coating ratio of the hydrophilic fine partic les over the composite surface. It also increases with increasing void age, which reduces the effective penetration area, and decreases with sinking extent.