Abstract: The particle size characteristics， specific productivity rate and energy consumption were studied in the grinding process of stirred mill and ball mill. The results showed that the product of stirred mill was more uniform than that of ball mill， and the mass fractions of fine grain and coarse particle of ball mill are higher than that of stirred mill. The straight line and exponential curve were respectively used to fit the relationships between different grinding particle size and specific productivity under stirred mill and ball mill， and the specific production rate of ball mill decreases obviously with the decrease of mill feed size. The equation formula proposed by Walker et al was used to fit the relationship between mill feed size and energy consumption， and the energy consumption growth rate of the stirred mill is much smaller than that of ball mill. Stirred mill has obvious advantages over ball mill in the process of fine grinding and ultra-fine grinding.

Key words: stirred mill, ball mill, grain size, specific production rate, energy consumption