| abstract |
PROBLEM TO BE SOLVED: Conventionally, a solvent extraction method has been mainly performed as a rare earth element recovery method. Since this method uses a large amount of solvent and acid, it requires complicated equipment, and is problematic from the viewpoint of saving resources and energy. In addition, it was expensive even for small and medium-sized manufacturers, so it could only be implemented by certain large companies. Therefore, there is a demand for a method of efficiently collecting rare earth elements from a solution containing rare earth elements, separating each metal ion with high purity from the collected material, and recovering the used acid. SOLUTION: A liquid containing a plurality of rare earth elements is brought into contact with an extraction reagent-carrying adsorbent produced by using a radiation graft polymerization method to adsorb rare earths, and then contacted with an acid of 0.5 N or less. Elute light rare earth, and then contact heavy acid with 0.5N or more acid to elute heavy rare earth. Then, using an electrodialyzer, the acid in the eluent is recovered, and at the same time, the rare earth element having a reduced acid concentration is recovered. [Selection] Figure 1 |