Extractive Recovery and Сoncentration of Palladium(II) from Simulated Nitrate–Nitrite PUREX Process Raffinate with 4-[(Hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1H-pyrazole

Abstract

The possibility of recovering and concentrating Pd(II) from simulated nitrate–nitrite PUREX process raffinate with a highly effective extractant, 4-[(hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1H-pyrazole (chloroform as a diluent), was examined. The 0.10 M extractant solution rapidly (within 5 min) and completely recovers Pd(II) with its tenfold preconcentration in the organic phase and highly selective separation from Fe(III), Pr(III), and Ni(II). The extracted Pd(II) and coextracted Ag(I) are stripped with a 2 M NH₄OH + 10 g L^–1 NH₄NO₃ solution to more than 99.9 and to 97.1%, respectively.