Elutriation(redirected from Air classification)
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(or clarification), the separation of slowly settling fine particles of a polydisperse suspension from rapidly settling larger and heavier particles by decanting a liquid containing the not yet settled particles from a settled precipitate.
Elutriation is a means of hydraulic classification of ground materials (with particle size from several tenths of a micron to several millimeters) that combines settling with décantation into consecutively linked settling basins (reservoirs, tanks, or chambers). The process is used to concentrate mineral raw materials, produce fine powders, and cleanse clays (particularly kaolin) of mechanical impurities (sand, mica, and feldspar).