Air classification

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  1. In powder metallurgy, the separation of powder into particle-size fractions by means of an airstream of controlled velocity; an application of the principle of elutriation. ASM, 1
  2. Sorting of finely ground minerals into equal settling fractions by means of air currents. These are usually controlled through cyclones, which deliver a coarse spigot product and a relatively fine vortical overflow. See also: infrasizer
  3. A method of separating or sizing granular or powdered materials, such as clay, through deposition in air currents of various speeds. This principle is widely used in continuous pulverizing of dry materials, such as frit, feldspar, limestone, and clay. See also: air classifier; air elutriator. Enam. Dict.
    Source: Dictionary of Mining, Mineral, and Related Terms

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