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A machine for the wet or dry fine crushing of ore or other material. The
three main types are the ball, rod, and tube mills. The mill consists of a
rotating cylindrical drum; the ore enters one hollow trunnion and the
finished product leaves the other. Modern practice indicates ball mill
feeds of 1/2 in, 3/4 in, and 1 in (1.27 cm, 1.91 cm, and 2.54 cm) for
hard, medium, and soft ores respectively and the products range from 35 to
200 mesh and finer. See also: open-circuit mill
Source:
Dictionary of Mining, Mineral, and Related Terms
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