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n. A hub.

n. An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.

n. An apparatus for the separation of dry comminuted ore, by exposing it to intermittent puffs of air.

n. A frame or ring of wire or hard paper fitting into the cartridge case used in some shotguns, and holding the shot together when discharged, to secure close shooting; also, a device for slightly narrowing the bore at the muzzle for the same purpose.

n. One who or that which concentrates.

n. In firearms: A wire frame or other device in which the shot are placed in the cartridge to hold them together when discharged from the gun, and which thus serves to effect close shooting.

n. A device which can be attached to the mouth of the bore of a shotgun, slightly narrowing it, to concentrate the shot when they are discharged.

n. In mining, the name frequently given, especially in the United States, to any complicated form of machine used in ore-dressing, or in separating the particles of ore or metal from the gangue or rock with which they are associated.

n. An apparatus wherein solutions or other products of manufacture are concentrated.

"The effluent coming out of the final concentrator is a thick “liquor,” 67 percent solids, that can be incinerated along with the volatile organics stripped out of the foul condensate."

centrifugal concentrator    belt-concentrators   

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