Method for recovering adsorbent particles, filling columns, and rare earth elements

[Problem]Provide adsorbent particles with a large adsorption amount of rare earth elements. Solution : A carrier particle containing an organic polymer containing a monomer unit derived from a styrene monomer, an organic compound having a functional group and an amino group containing sulfur atoms adhering to the surface of the carrier particles, and a diglycolate residue bound to an amino group. The content of sulfur atoms in the adsorbent particles is 0.0% relative to the mass of the adsorbent particles. It is 5% by mass or more. [Selection figure]None