Sorption recovery of gallium and aluminum from alkaline solutions on an AN-31 anion exchanger

Resumo

Sorption of aluminum and gallium in the form of hydroxo complexes on a weakly basic AN-31 anion exchanger at 298 K from model solutions is investigated. Based on the experimental data, the forms of ions sorbed by the solid phase of the anion exchanger are determined. Sorption of pentahydroxy aluminate and pentahydroxy gallate ions occurs in the Stern–Helmholtz layer. Apparent constants and Gibbs energies of ion-exchange reactions are calculated. The values of the total exchange capacity of gallate ions of 55–58 g/kg in static conditions determine the use of an AN-31 anion ex change resin during the concentration of gallium ions from alkali aluminate solutions.