Thermodynamics and kinetics of lutetium extraction with HEH(EHP) in hydrochloric acid medium

Solvent extraction has been the most widely used technique for rare earths separation. In this study, thermodynamics and kinetics of lutetium extraction with HEH (EHP) in hydrochloric acid medium were investigated. The extraction mechanism and the relevant parameters were determined by experiment research which can guide the practical extraction process. The data indicated that chloride ion had no effect on lutetium extraction, the rate constant increased when stirring speed was enhanced. Effects of temperature, HEH (EHP) concentration, acidity, and chloride concentration were also studied. Thickness of the diffusion film was also calculated to be 4.66×10–3 cm at 150 r/min.

Graphical AbstractRelation between HEH(EHP) monomer concentrations and interfacial tension (1), surface excess (2 T=298 K, [Cl–]=0.2 mol/L, pH=2.0Figure optionsDownload as PowerPoint slide