METHOD FOR MAGNETIC SEPARATION OF LOW-MAGNETIZATION TUNGSTEN-BEARING POWDERED WASTES Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: method involves supplying basic material in the form of fine powder into charging device and from this device onto upper belt of lower conveyor; passing material through discrete magnetic field which results in extraction of magnetic fraction as material advances through magnetic field. Magnetic particles are displaced along lower belt of upper conveyor and are discharged into receiver due to periodic alternation of polarity of magnetic field. Nominal thickness of powder layer on upper belt of lower conveyor is controlled by mechanical doser. Nominal thickness of 10 mm of waste layer is set on doser scale by controlling charging device vibration frequency. Handle is set to the initial position, which corresponds to magnetic field intensity of 25 kA/m. In case waste layer thickness value deviates from predetermined value, distance between pole tips and magnets is varied within the range of (+0.2)-(-0.2) of magnet width by pivoting the handle. EFFECT: increased efficiency. 2 dwg