UPTAKE OF COPPER AND COBALT IN A COMPLEXING RESIN - SHRINKING-CORE MODEL WITH 2 REACTION FRONTS

The kinetics of simultaneous ion exchange of copper and cobalt with im inodiacetic chelating resins has been studied. Microscopic studies of the ion-exchange process clearly show two different reaction fronts al lowing the use of shrinking-core type models. The influence of system parameters is studied both theoretically and experimentally. Experimen tal results obtained at different total ion concentrations for various copper-cobalt ratios and particle diameters are reasonably predicted by the shrinking-core model, allowing diffusivity calculations. (C) 19 98 Elsevier Science B.V.