Applications of grinding kinetics analysis to fine grinding characteristics of some inorganic materials using a composite grinding media by planetary ball mill

A series of wet grinding experiments using calcite, pyrophyllite, and talc powder by a vertical type planetary ball mill, in which the size and distribution of grinding balls were varied with the Gaudin–Schuhmann equation, were carried out and the grinding rate constant K′ in equation of grinding kinetics was examined based on the grinding kinetics analysis of experimental particle size distribution of ground products obtained in various grinding conditions. gression equation for the grinding rate constant K′ was expressed by an empirical equation involving the mean diameter of composite grinding balls d̄B [mm], the median diameter of feed xmo [μm], and Bondʹs work index Wi [kW h/t] as follows:K′=c1(Wixmo)2xmod̄Bexp−c2Wixmod̄Bwhere the values of the empirical constants c1 and c2 were 592, 0.0438, respectively, within the experimental ranges.