Mineral Powders: Activity and Specific Surface Area

A thermodynamic criterion—surface activity—has been proposed to characterize the reactivity of powder materials obtained by the method of mechanical grinding. The work shows that, between the surface activity calculated taking into account values of the specific surface area of powder materials determined by the method of gas sorption and this criterion calculated from the specific surface area determined by the method of gas permeability, there is a functional interrelation that allows one to draw a conclusion about the effectiveness of mechanical activation of mineral raw material systems.