Abstract: Provided is a cleaning device for cleaning a magnet powder including: a flask provided to contain the magnet powder and a cleaning material used to clean the magnet powder; and a vacuum manifold provided to maintain the magnet powder and the cleaning material contained in the flask in an inert state during cleaning. Provided is a method for cleaning a magnet powder including a loading operation for loading a magnet powder, a cleaning solution, and zeolite into a flask; a gas injecting operation for injecting an inert gas into the flask; and a vacuum drying operation for drying the magnet powder and the zeolite in a vacuum.

Abstract: Disclosed are a method for pulverizing a waste magnet and a waste magnet powder produced by the method. More particularly, disclosed is a method for efficiently producing a waste magnet powder having a small average particle size by pulverizing a raw material containing a hydrogen-occluded rare earth metal before dehydrogenation of the raw material.

Abstract: Disclosed are a method of manufacturing a rare-earth permanent magnet capable of offsetting a partially uneven demagnetization by varying the amount of heavy rare-earth element diffused to a grain boundary for each region and a Nd—Fe—B-based permanent magnet manufactured by the same. The method includes: preparing a base material including a plurality of regions by using a sintered magnet including an Nd—Fe—B-based alloy; preparing a coating material including a heavy rare-earth element; applying the coating material to a surface of the base material; and diffusing the heavy rare-earth element to a grain boundary of the base material by heat-treating the base material to which the coating material is applied. In the applying the coating material, an amount of the coating material applied to each region of the base material may vary.