FIELD: technology of separation of minerals or other powdery materials, for instance, chips. SUBSTANCE: device has bearing surface permeable for gas to which material to be separated is supplied; chamber accommodating means for supply of gas pulses through bearing surface to material. Located under bearings surface, over its entire length, are barrier members which in open position form holes for gas passage. Barrier members may rotate in same or in opposite directions. EFFECT: provided sharp impact by gas, uniform distribution of gas pulses over surface. 9 cl, 3 dwg
