FIELD: concentration of sands. SUBSTANCE: multiple-thread beat screw 7 with corrugated surface 9 is secured on the internal surface of drum 1. The lower part of drum 1 on rollers 3 is positioned in bath 5 filled with water. The drum rotates in pulsed conditions. Source material is washed out with water in bath 5. Heavy material particles are trapped on corrugated surface 9 of flat screw 9 with unbent edge 8. When the drum is turned, heavy particles are washed off into tray 14 by sprayer 16. Gangue from the drum bottom is lifted by bucket elevator 10 and washed off into tray 14 by sprayer 17. EFFECT: improved design. 3 dwg
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