Industrial classifiers sort materials by size, shape, density, etc.
A cyclone (hydrocyclone) is most often used to separate "heavies" from a liquid mixture originating at a centrifugal pump or some other continuous source of pressurized liquid.
An air classifier is an industrial machine which separates materials by a combination of size, shape, and density. Air classifiers are commonly employed in industrial processes where a large volume of mixed materials with differing physical characteristics need to be separated quickly and efficiently.
Screw classifiers are used for washing and dewatering pulps and in closed circuit grinding. Spiral classifiers, sand screws, and fine material washers dewater fine aggregates.