RU97112160A - METHOD AND DEVICE FOR CLEANING POWDER - Google Patents

Claims (2)

1. The method of mechanical cleaning of the powder (25), in particular, primary alumina, which is sent to the surface (2P) in the form of particles to separate contaminants adhering to its surface (35), characterized in that the alumina to be cleaned (25) is supplied into the separating device (2) and using the crusher (2R) of this separating device (2) at a speed of 20-30 m / s, several dozen jd times per second for less than one second, up to 10 seconds are directed to the fenders (2Р ) rotating in the opposite direction to the rotation of the crusher (2R), and the purified alumina powder (30) with a particle size above 10 μm is separated from the purified alumina powder (31) with a particle size of less than 10 μm and impurities (35) using an air separator (3) and / or cyclone and fed to the electrolysis of the melt, while powdered aluminum oxide (31) with a particle size of less than 10 microns and pollution (35) is fed to a landfill or as raw material for further processing.  2. A cleaning device for mechanically separating contaminants (35) in the form of particles from the surface of the powder (25), in particular primary alumina, using a separating device (2) provided with a surface (2P) placed inside it, characterized in that the device (2) is made as a shock-reflective mill with at least one crusher (2R), with which the powder to be cleaned (25) is directed at a given speed to the baffle disks (2P), rotating in the opposite direction to control board of rotation of the crusher (2R), moreover, the crusher (2R) and bump discs (2P) are made of hard alloy, ceramic or polymer, and an air separator (3) and / or cyclone (4) is installed behind the separating device (2).