USA Ball mill Google Patents
FIG. 1 is a schematic diagram showing a ball mill in accordance with the invention. 1 . FIG. 2 is a side view of a grating used in the ball mill. FIG. 3 is a plan view of the grating shown in FIG. 2. FIG. 4 is a sectional view of a receptacle attached over the outlet of the ball mill in accordance with the invention.