Predicting breakage rates of fine particles in stirred media mills depending on stressing energy and frequency

摘要

In order to predict a material's grinding behaviour in stirred media mills it is advantageous to describe the breakage rate as a function of material and machine parameters. For coarse particles these dependencies are often experimentally studied by single particle characterization. In this work we investigate the breakage behaviour of fine particles (< 110 μm) as a collective in a wet operated stirred mill. The initial breakage rate of narrow particle size fractions between 30 and 110 μm was determined depending on various rotor speeds and bead sizes. The characteristic values of stressing energy and stressing frequency are estimated by an analytical model and discrete element method. Similarly to Vogel and Peukert's model for impact comminution, it is found that for the materials of glass and limestone the breakage rate can be described as a function of the characteristic values of stressing energy, stressing frequency and particle size.