MODEL FOR CONTINUOUS GRINDING IN A LABORATORY HAMMER MILL

The equations of fully mixed, steady continuous grinding with rapid ideal classification through a discharge screen have been modified to allow for non-rapid removal of material less than the screen size. Values of specific rates of breakage, daughter fragment distributions and the variation of specific rates with mill hold-up determined in prior batch tests on a hammer mill were used in the equations, to predict hold-up versus feed rate and product size distribution versus feed rate. The predictions were in reasonable agreement with the experimental values from continuous grinding. There is a maximum production rate which can obtained, and energy utilization is inefficient at low production rates. © 1979.