MATERIAL GRINDING METHOD AND APPARATUS Russian patent published in 2001 - IPC

FIELD: equipment for fine and superfine grinding of materials with different hardness. SUBSTANCE: method involves forming flows of material to be ground in channels extending from axis of grinding apparatus; providing alternative collision between material flows and grinding members which are mounted on rotors rotating in opposite directions for imparting centrifugal motion to flows; subjecting flows of materials to acceleration in channels between rotors, with channel section being made in the form of closed circuit. Upon collision with grinding members, grinding is performed in at least one additional outer annular zone of rotor by perturbing aerodynamic actions at high-speed and high-frequency collision of material particles, with nature and value of power loading being changed. Apparatus has housing with axial inlet opening and cylindrical grinding chamber with two horizontal rotors mounted for rotation in opposite directions and provided with internal annular rows of grinding members. Channels between grinding members have section in the form of closed circuit. Rotors have at least one additional outer grinding zone. EFFECT: increased efficiency, simplified construction and improved grinding quality. 9 cl, 2 dwg