Verfahren zur Rückgewinnung von wiederverwendbaren Wertstoffen aus Schrott von Legierungen der seltenen Erden mit Eisen und Kobalt

摘要

A method for recovering rare earth elements and cobalt from a rare earth-iron alloy containing cobalt is disclosed, including the steps of: preparing a slurry of the rare earth-iron alloy containing cobalt, adding a diluted nitric acid solution to the slurry with air being introduced into the slurry, while maintaining the pH of the resulting mixture at 5 or higher to dissolve metals including rare earth metals and cobalt at 50 DEG C or lower, and separating an undissolved residue containing iron from a rare earth-containing nitrate solution by filtration.