EXTRACTION METHOD OF RARE EARTH ELEMENTS FROM MONAZITE

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PURPOSE : A method of extracting a rare-earth material from a monazite is provided to obtain a rare-earth material of a high purity, and to neutralize an acid state without a separate process.CONSTITUTION : A method of extracting a rare-earth material in a monazite comprises the following steps : a rare-earth material solution is prepared by acid disassembling or alkali disassembling a monazite concentrate; a rare-earth material to extract among the rare-earth material solution is extracted by an acid solvent; an aquatic phase and an organic phase including the rare-earth material are separated by the acid solvent extraction; and an acid and an extraction object rare-earth material are absorbed in an ion-exchange resin, and a solvent among the organic phase is removed.[Reference numerals] (AA) Prepare rare-earth material solution; (BB) Extract acid solvent from the rare-earth material; (CC) Separate an aquatic phase and an organic phase; (DD) Re-use the solvent; (EE) Absorb an acid and an extraction object rare-earth material in an ion-exchange resin; (FF) Remove acid; (GG) Collect the rare-earth materialCOPYRIGHT KIPO 2013