Abstract: Mass transfer and extraction kinetics of yttrium with the purified Cyanex 923 in nheptane from nitrate medium have been investigated by using a constant interfacial cell with laminar flow at 298 K. The interfacial adsorption properties of purified Cyaner 923-heptane-0.2 mol/L (H,Na)NO3 were studied at 298 K. The experimental results show that the mass transfer is controlled by diffusion and the chemical reactions are carried out in the interfacial zone. The extraction rates of yttrium were measured at different chemical compositions by varying ionic strength, pH valused and the purified Cyane 923 concentrations. the initial extraction rate equations were obtained.

Key words: yttrium, Cyaner 923, extraction kinetics, interfacial tension,