Abstract
Experiments on the extraction reaction between Cu (II) and a microcapsule containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (MC-EHPNA) were carried out in batches. The effects of stirring speed, hydrogen ion concentration, metal concentration and temperature on the initial extraction rate were examined experimentally. The effects of concentrations of hydrogen and copper-ion on the initial extraction rate showed a similar tendency to those of a solvent extraction system. From these experimental results, both diffusion and chemical reaction are expected to contribute to the rate-determining step. It is necessary to evaluate the metal extraction behavior with the microcapsules by means of the diffusion model with interfacial reaction.
