METHOD FOR SEPARATING BOTH OF LIGHT RARE EARTH ELEMENTS AND HEAVY RARE EARTH ELEMENTS FROM PROCESSIN

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PROBLEM TO BE SOLVED : To provide a method for separating both of light rare earth elements and heavy rare earth elements from a processing object containing them as an alternative technique of a solvent extraction method. SOLUTION : A calcium reduction reaction is conducted on a mixture of composite oxide or oxide of light rare earth elements and heavy rare earth elements obtained from a processing object containing the light rare earth elements and the heavy rare earth elements in the presence of a getter metal, a light rare earth metal reduced by the calcium reduction reaction is alloyed with the getter metal and recovered. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT