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 a scarce, low-yield rare earth element from a rare earth element-containing material at a higher concentration rate.SOLUTION : A rare earth element concentration method from a rare earth element-containing material includes a process 1 for heating and melting the rare earth element-containing material in the coexistence of a boron oxide flux (BO) to form a BOphase and a phase, below the BOphase, enriched in a rare earth element more than the BOphase, that is, the process 1 for cooling after maintaining 1, 150-1, 600°C for 10-360 minutes.