FIELD: grinding materials; manufacture of powdered metals. SUBSTANCE: apparatus includes housing with helical slot on inner lateral surface and material inlet and outlet branch pipes, rotor with slots whose walls are inclined to form vortices acting on material being treated. Slots of rotor have form of parallelogram in cross section. Branch pipes of housing are engageable with helical slot on inner lateral surface of housing. EFFECT: enhanced reliability. 3 cl, 2 dwg
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