Applications of grinding kinetics analysis to fine grinding characteristics of some inorganic materials using a composite grinding media by planetaryball 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 distri bution of grinding balls were varied with the Gaudin-Schuhmann equation, we re carried out and the grinding rate constant K ' in equation of grinding k inetics was examined based on the grinding kinetics analysis of experimenta l particle size distribution of ground products obtained in various grindin g conditions. The regression equation for the grinding rate constant K ' was expressed by an empirical equation involving the mean diameter of composite grinding ba lls (d) over bar (B) [mm], the median diameter of feed x(mo) [mum], and Bon d's work index W-i [kW h/t] as follows: K ' = c(1)/(w(i)x(mo))(2)(x(mo)/(d) over bar (B))exp[-c(2)(W(i)x(mo)/(d) ov er bar (B))] where the values of the empirical constants c(1) and c(2) were 592, 0.0438, respectively, within the experimental ranges. (C) 2001 Published by Elsevi er Science B.V.