The method of the rare earth element, a rare earth element concn. contg.

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PROBLEM TO BE SOLVED : To provide a method for concentrating rare earth elements from a rare earth element-containing product at high concentration ratio.SOLUTION : There is provided a method for concentrating rare earth elements from a rare earth element-containing product including a process 1 for heating and melting the rare earth element-containing product in a co-presence of BOto form a BOphase and a rare earth element rich phase more than the BOphase under the BOphase.