Method for recovering reusable elements from rare earth-iron alloy
AssigneeSantoku Metal Industry Co., Ltd.
InventorKazuhiro Yamamoto
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Abstract
A method for recovering rare earth elements and cobalt from a rare earth-iron alloy containing cobalt is disclosed, including the steps of: a 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 pH of a resulting mixture at 5 or higher to dissolve metals including rare earth metals and cobalt at 50.degree. C. or lower, and separating an undissolved residue containing iron from a rare earth-containing nitrate solution by filtration.
Claims8
A method for recovering rare earth elements and cobalt from a rare earth-iron alloy containing cobalt comprising the steps of:
- preparing a slurry of the rare earth-iron alloy containing cobalt,
- adding a diluted nitric acid solution wherein said nitric acid solution has a concentration of not higher than 39% by weight to said slurry with air being introduced into said slurry, while the pH of said slurry is maintained at 5 or higher to dissolve metals including rare earth metals and cobalt at 50.degree. C. or lower, thereby obtaining a rare earth-cobalt-containing nitrate solution containing an undissolved residue containing iron, and
- separating said undissolved residue containing iron from said rare earth-cobalt-containing nitrate solution by filtration.
Dependencies are inferred from the claim text.