METHOD AND DEVICE FOR MECHANICAL CLEANING OF POWDER FROM IMPURITIES IN THE FORM OF PARTICLES STICKING TO IT Russian patent published in 2000 - IPC

FIELD: methods and devices for mechanical cleaning of powders from impurities sticking to their surfaces. SUBSTANCE: method consists in that powder is supplied into separating appliance and with help of crusher is directed for least than from 1 to 10 s at velocity of 20-30 m/s onto deflecting discs rotating in direction opposite to direction of crusher rotation; and cleaned powder with particles sizing above 10 mcm is separated from cleaned powder whose particles sizing less than 10 mcm and impurities with help of pneumatic separator and/or cyclone. Device has separating appliance made in the form of percussive-deflecting mill with at least one crusher which is used for directing of powder to be cleaned at preset velocity to deflecting discs rotating in direction opposite to that of crusher. Crusher and deflecting discs are made of hard alloy, ceramic material or polymer. Installed behind separating appliance is pneumatic separator and/or cyclone for cleaning powder with particles sizing above 10 mcm from powder whose particles sizing less than 10 mcm and impurities. EFFECT: low-cost and highly efficient separation of impurities sticking to powder surfaces. 2 cl, 3 dwg