Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
213634 | Hydrometallurgy | 2006 | 8 Pages |
The interfacial tension is measured for Cyanex 302 in heptane and adsorption parameters are calculated according to Gibbs equation and Szyskowski isotherm. The results indicate that Cyanex 302 has a high interfacial activity, allowing easy extraction reaction to take place at the liquid–liquid interface. The extraction kinetics of yttrium(III) with Cyanex 302 in heptane are investigated by a constant interfacial cell with laminar flow. The effects of stirring rate, temperature and specific interfacial area on the extraction rate are discussed. The results suggest that the extraction kinetics is a mixed regime with film diffusion and an aqueous one-step chemical reaction proposed to be the rate-controlling step. Assuming the mass transfer process can be formally treated as a pseudo-first-order reversible reaction with respect to the metal cation, the rate equation for the extraction reaction of yttrium(III) with Cyanex 302 at pH < 5 is obtained as follows:Rf=10−7.85[Y(OH)2+](a)[H2A2](o)1.00[H+](a)−1.00Diffusion parameters and rate constants are calculated through approximate solutions of the flux equation.