The raw material for producing cerium rare earth metals

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PROBLEM TO BE SOLVED : To provide a light rare-earth material for producing a cerium abradant which comprises cerium as a major component and contains reduced amount of alkaline metals, alkaline earth metals and radioactive materials. SOLUTION : The material contains light rare-earth elements in an amount of at least 35 wt.% in terms of oxides. Based on the total amount of rare-earth oxides, the amount of cerium is at least 50 wt.%, the amount of alkali metal oxides is at most 0.5 wt.%, the total amount of alkali metals and alkaline earth metal oxides is at most 1.5 wt.% and the total amount of thorium oxide and uranium oxide is at most 0.05 wt.%. COPYRIGHT : (C)2004, JPO