Studies of removal of palladium(II) ions from chloride solutions on weakly and strongly basic anion exchangers

Palladium and its compounds find wide application in industry as a catalytic agent in different manufacture processes. Recovery of precious metals from industrial wastes is difficult and time consuming but in spite of these disadvantages it becomes profitable. Palladium(H) ions sorption from various chloride solutions of the composition: 0.1-6.0 M HCl-0.00056 M Pd(II), 1.0 M ZnCl2-0.1 M HCl-0.00056 M Pd(II), 1.0 M AlCl3-0.1 M HCl-0.00056 M Pd(II) on the weakly and strongly basic anion exchangers (Varion ATM, Varion ADM and Varion ADAM) was discussed. The sorption research of Pd(II) ions on these resins was carried out by means of static and dynamic methods. The dynamic processes were applied in order to determine the breakthrough curves of Pd(II) ions. Moreover, the working ion-exchange capacities as well as the weight and bed distribution coefficients were determined from the Pd(II) breakthrough curves. The recovery factors of Pd(II) ions (% R) depending on the phase contact time were obtained by means of static methods. The highest ion-exchange capacities for the 0.1-6.0 M HCl-0.00056 M Pd(II) systems were obtained for the weakly basic ion-exchange resin Varion ADAM. (c) 2008 Elsevier B.V. All rights reserved.