Rare earth metal flocculating agent

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The invention relates to a technology for separating and recycling the terres rares having small ionic radius from the water solution blended with multiple types of terres rares. The invention also relates to an agglutinant used for separating and recycling specified terres rares from the water solution blended with multiple types of terres rares. The agglutinant is characterized by containing water-soluble macromolecules having acid perssad and the water-soluble macromolecules containing amino and with the main chain being a long chain. Further provided are a method and an apparatus for separating and recycling terres rares with the agglutinant.