Aerial classification

AERIAL CLASSIFICATION (EN: air classification; DE: Luftklassierung; FR: classification pneumatique, selection pneumatique; ES: clasificacion neumatica; RU: воздушная классификация) is the fractionation of the industrial crushed materials, or of the natural powdered materials, according to the size and density of the particles, which is performed with the help of the directional movement of the air streams or of the gas streams. The most effective range of the particle sizes of the materials is from 20 micrometres to 10 millimetres.

The aerial classification is performed within the aerial separators. They distinguish the equilibrium and nonequilibrium processes of the aerial classification. The processes of the first type proceed within the gravitational fields and within the centrifugal fields, the processes of the second type (most effective) proceed within the cascaded separators of the gravitational type. The separators of the latter type ensure the significant performance (up to 40 tonnes per hour per 1 square metre of the horizontal cross-section of the apparatus) with the high effectiveness of the separation. The aerial classification displaces the traditional hydraulic classification within various branches of the processing industry.