Talc particulates were ground by a high-speed rotor mixer without grinding
media (beads) under atmospheric condition in order to evaluate the performa
nce of the mixer. The median diameter of the ground sample decreases with a
n increase in both rotational speeds of the rotor and the vessel, and with
a decrease in the clearance in the working space. The grinding limit can be
controlled by the operational conditions. The grinding limit is correlated
with the tangential force acting on the particulates calculated from the p
articulates motion simulated by the Particle Element Method regardless of t
he rotational speeds and the clearance.