Magnet of rare earth metals for mri scanner produced from recycled, pr - nd erzresiduum containing

摘要

A permanent magnet for an MRI scanner is made by removing extraneous elements from an ore containing rare earth elements to leave elements Pr and Nd therein and then selectively stripping therefrom a portion of the element Nd as a by-product to leave an ore residuum including both elements Pr and Nd therein including a given amount of cerium. The residuum is alloyed with a transition metal to form an alloy therewith. The alloy of type CePrNd-Fe-B is then formed into a rare earth permanent magnet configured for use in the MRI scanner.