FIELD: mineral resources benefication during ores and sand-gravel mixtures washing. SUBSTANCE: rotating perforated drum 1 has axis-symmetrical sowing surface of changeable profile 5. Initial material is fed through chute 2. Water is fed in drum 1 through spraying pipe 4. Transporting perforated racks 7 are fixed on drum 1 inner surface. Big size material reception chute 3 is mounted under drum discharge butt 8. Small size heavy and small size light-weight materials reception chutes 11 and 9 are located under sowing surface 5. Dram inclination angle is changed by jack. EFFECT: increased productivity. 2 dwg, 1 tbl
