Abstract
Beads motion in a stirred mill filled with a slurry was simulated by the Discrete Element Method (DEM), enabling to calculate the impact energy of beads. Since the specific impact energy of beads is known to be well correlated with the grinding rate constant, 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 number 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 number of pins, and the specific impact energy reaches the maximum value at 8 in number of pins under the present condition. In addition, the maximum value under the specific impact energy is shifted towards large number of pins as the beads filling ratio increases. The specific impact energy of beads is increased with an increase in pin length.
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