material to be ground is fed from the left through a 60 cone and product is discharged through a 30 cone to the right.as the shell rotates the balls are lifted up on the rising side of the shell and they cascade down from near the top of the shell.the solid particles in between balls are ground and reduced in size by impact.as the shell rotates the large balls segregate near the feed end and small balls segregate near the product end.if the rate of feed is increased coarser product will be obtained and if the speed of rotation is increased the fineness for a given capacity increasesduring grinding , balls themselves wear and are continuosly replaced by new ones so that mill contain ball of various ages and thus of various ages and thus of various sizeball mill product 1 to 50 tonn /hr of powder of which 70 to 90 % will pass through a 200 mesh screen and energy requirment of the ball mill is about 16 kwh / tonnin case of a batch operated mill a measured quantity of a solid to be ground is charged to the mill through the opening in the shell . the opening is closed and the mill is rotated for severral hours it is then stopped and the product is discharged
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