Analysis of Effect of Pin Configuration on Beads Motion in a Stirred Mill by DEM

Abstract

Beads motion in a stirred mill filled with a slurry was simulated by the Discrete Element Method 7 enabling to calc. the impact energy of beads. Since the specific impact energy of beads is known to be well correlated with the grinding rate const., it was monitored as an effective index of grinding performance in the simulation work. The present work is to investigate effect of the pin configuration, particularly, the no. of pins attached on the agitator and their length on the beads motion as well as the impact energy. The pins were attached on the axis of the agitator equi-interval in the circumference direction and 3-line in the horizontal axis in the mill. We have found that the beads motion is dependent on the no. of pins, and the specific impact energy reaches the max. value at 8 in no. of pins under the present condition. In addn., the max. value under the specific impact energy is shifted towards large no. of pins as the beads filling ratio increases. The specific impact energy of beads is increased with an increase in pin length. [on SciFinder(R)]