Abstract
Soma sand and Neobead particles were pulverized by a screen mill. The particle size of feed was varied in the range from about 44 to about 1000 μm. The material balance was expressed in matrix form from the size distributions of products. The simulated results of two and three stages of grinding were in good agreement with the experimental ones. These results show that breakage is subject to a first-order law. Then the selection function and the breakage function were determined by the material balance equation under the assumption that the mill is operating in fully mixed condition.
Consequently, both functions are approximately described as the power function of the particle size. The characteristics of the size distributions of products are well explained by them. The value of power is in the range from about 2 to about 4. It has a tendency to be large with increasing impact velocity.
