METHOD FOR RECOVERING RARE EARTH ELEMENT FROM USED RARE EARTH ELEMENT TYPE ABRASIVE MATERIAL

PROBLEM TO BE SOLVED: To recover a rare earth element from a used rare earth element type abrasive material as hydroxide or oxide in high purity at a relatively low cost. SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth e...

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1. Verfasser: UCHINO YOSHIJI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To recover a rare earth element from a used rare earth element type abrasive material as hydroxide or oxide in high purity at a relatively low cost. SOLUTION: A used rare earth element type abrasive material is treated with an aq. mineral acid soln. to dissolve the rare earth element and the resultant soln. is separated from the undissolved material and recovered. Oxalic acid and an aq. alkali oxalate soln. are added to the recovered soln. so that the soln. is adjusted to