2012 Volume 85 Issue 4 Pages 144-150
The effect of dispersion factors on the diameter of titanium dioxide powder dispersed with a micro-bead type bead mill was investigated. The dependence of the median diameter of dispersed powder on dispersion time and specific energy were investigated using various experimental variables such as bead size, filling rate of beads, agitator peripheral speed, bead materials and particle size of the feeding raw material. In addition, dispersion efficiency of different stirrer disk shape and different bead mill structure was compared using a micro-bead type bead mill and a high-flow circulation type bead mill. As a result, when a bead mill with beads of a fixed size was used to disperse a feed raw material of fixed particle size and fixed slurry solids content, the diameter of the dispersed powder was found to depend on the specific energy. Especially, we clarified that the dispersion efficiency of the bead mill, from the viewpoint of specific energy, is greatly influenced by the bead size.
