Solvent extraction of La, CE, and Nd elements from the NiMH batteries leach solution

To separate rare earth elements D2EHPA, Cyanex 272, and DBC extractants used and results showed they couldn't selectively separate them, but in optimized conditions simultaneous extraction of them achieved. A DBC-D2EHPA mix had a synergistic effect, achieving recoveries of 98.76% (cerium), 97.94% (lanthanum), and 100% (neodymium). The McCabe-Thiele diagram indicated 3, 2, and 1 steps with Cyanex 272 for 90% recovery of cerium, lanthanum, and neodymium, respectively. Stripping tests with sulfuric, nitric, and hydrochloric acids were unsatisfactory, requiring further study.