Synergistic Extraction of U (Ⅵ) With NPPFA and Phen

The synergistic extraction of U(Ⅵ) from nitric acid solution into mixture of 1-(2-pyridyl)-1-pyrrolidyl-1-methanone（NPPFA） and 1, 10-phenanthroline (phen) in dichloride ethane was studied. The influences of mole fraction of NPPFA, value of pH, the concentration of salting-out agent and temperature on the distribution ratio were discussed. The results show that NPPFA and phen give strong synergism and the distribution ratio of U (Ⅵ) is high by introducing salting-out agent. The formula of synergistic extraction compounds determined by slope analysismethod is UO₂(NO₃)₂·NPPFA·phen.