Deep removal of copper from cobalt sulfate electrolyte by ion-exchange

摘要

SP-C was applied for the removal of Cu2 + from simulated cobalt sulfate electrolyte containing Co 2+50 g/L and Cu 2+ 0.5-2.0 g/L.Experimental conditions included pH of 2-4,temperature of 20-60°C and contact time of 10-40 min.The investigation demonstrated that SP-C had recommendable efficiency in adsorbing Cu2 + from the electrolyte with 25-to 100-fold of Co2 +.The optimal adsorption conditions of SP-C were pH of 4,contact time of 30 min and ambient temperature.The study also showed that the loaded resin could be effectively eluted with 2.0 mol/L H2SO4 solution at a contact time of 40 min;the peak concentration of Cu2 + in the eluate was about 35 g/L.The sorption characteristics of Cu 2+ by SP-C could be described by Langmuir isotherm and the pseudo second-order kinetic equation.Infrared spectra showed that nitrogen atoms in the functional group coordinated with Cu2 + to form coordination bands.