MILL Russian patent published in 1996 - IPC

FIELD: building engineering. SUBSTANCE: mill has housing 1 coaxially connected up to separation vortex chamber in which working body in the shape of spiral is placed. Fixture 7 for air and material feeding and materials duct 8 are tangentially switched on to separation chamber 2. Device for selecting target fraction is combined with hollow unit 4 of strengthening and is disposed in vortex separation chamber 2. This device is made as cylinders located one in another and connected with the help of ring wall 12. Windows 13 are made on lateral surface of external cylinder. EFFECT: enhanced quality of fine grinding. 11 cl, 6 dwg