No c o nsiderable change in blain specific surface was found in the study.The acti on and mechanism of grinding aids were also dicussed.

• 助磨剂的作用机理是减小了粉碎阻力、防止团聚和糊磨、提高流动性而加强了料和球的作用频率和效率，从而提高了粉磨效率。