Abstract：To evaluate efficiency of ball mill and stirred mill objectively, and afford experimental data for blast furnace slags preparation technology, blast furnace slag products with different fineness were prepared by ball mill and stirred mill.The grain size distribution characteristics of slag powders produced by different grinding method and milling time were analyzed comparatively. The results show that particle size distribution of products prepared by both ball mill and stirred mill are in accordance with Rosin Rammler-Bennet distribution. With prolong of the grinding time, particle sizes of particles decrease. The efficiency of stirred mill grinding is higher. It’s particle size distribution is narrower than that of ball mill.

Keywords：blast furnace slag; ball mill; stirred mill; particle size distribution