The separation and recovery of rare earth metals from fluorescence material waste was investigated by using solvent extraction with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester in kerosene. Extraction equilibrium expressions were established for the trivalent metals (La, Ce, Eu, Tb, Y and Al) and divalent metals (Ca, Sr and Ba) for both single and multi components systems. The process simulation for the selective recovery of Eu, Tb and Y revealed that effective separation and recovery of Eu, Tb and Y can be achieved in two steps in a counter-current mixer-settler cascade from the alkaline earth metals (Ca, Sr and Ba) and La and Ce.
Takahide Nakamura, S. Nishihama, K. Yoshizuka
Solvent Extraction Research and Development-japan