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a. A pulverizing unit consisting of a rotor, fitted with movable hammers,
that is revolved rapidly in a vertical plane within a closely fitting
steel casing. The hammers hit falling rock, which is fractured on impact,
or by collision with other rocks or with the casing. When sufficiently
reduced in size, the pulverized rock escapes through grids in the casing.
Syn: beater millb. Coal crusher in which the blow is induced with the aid of centrifugal
force. The coal is broken with the impact and usually dragged across grate
bars in the bottom of the unit. See also: ring crusher
Source:
Dictionary of Mining, Mineral, and Related Terms
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