METHOD OF RECYCLING SPENT MATERIALS Russian patent published in 2002 - IPC

FIELD: recycling of spent materials formed from industrial wastes mainly on base of granite and marble. SUBSTANCE: method includes crushing of wastes, preliminary aerodynamic classification of raw material at moisture content of up to 5.0 % and rate of air flow of 1 to 50 m/s for separation of fine fraction (3 to 0.001) mm from coarse fraction. Splitting remaining coarse fraction s effected through screening into fractions of 10-2 mm. Fine fraction 3-0.001 mm is classified for the second time in aerodynamic flows at rates of 0.01-30 m/s into fractions 3-1; 2-0.4; 0.8-0.1 and 0.2-0.001 mm at continuous introduction of fraction of 3-0.1 mm obtained after screening. Fractions thus obtained are used for manufacture of building and decorative materials. EFFECT: reduced power requirements for processing wastes; extended range of fractions; enhanced ecology. 18 cl, 4 dwg, 1 tbl