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[476]. Separating dust from grain, &c., by a current of air driven through the stream of material as it falls from hopper to hopper. See also [Nos. 1268], [1270].
[477]. Ore concentrator; consists of an endless rubber belt with flanges (see [No. 1082]), having a slow longitudinal motion, and a rapid shaking motion, either sideways, as in the “Frue Vanner,” or endwise, as in the “Embrey” concentrator; a stream of water runs over the ore, the heavy particles settle on the belt, and the mud is washed off.
[478]. Jig for separating ores by motion of a piston in water, the heavy parts settle to the bottom and the light parts are removed at the top.
Filtration through various substances—as sand, charcoal, calcined ores, &c., is employed to separate suspended matter from liquids.
Separation by subsidence in a tank, similar to [No. 1571], is employed for lime, &c.
Chemical deposition and evaporation are necessary in many cases.