### how to improve cement ball mill performance in closed

The equation below shows the relationship between ball mill grinding efficiency and material fineness: K d = G 2 /G 1 = (d 1 /d 2) X (1) *Note. K d: the relative productivity of the mill; G 1 & G 2: respectively represent the mill output (T / h) when the feed particle size is d 1 and d 2;