Fine grinding and states of equilibrium

Abstract

During grinding, temporary and permanent dynamic equilibria may occur due to the interaction of particles. These equilibria are represented by the constancy of the sieve residue and the zero value of the grinding rate. The temporary dynamic equilibrium occurring during the initial stage of grinding does not imply the end of increasing fineness but is accompanied in every case by increased power consumption. The state of permanent dynamic equilibrium occurs during grinding for a longer period and indicates the end of increasing fineness for the given particle size. The so-called curve of state of grinding equilibrium combines the states of equilibrium occurring at the individual particle sizes and separates the stages of increasing and decreasing fineness.