Sorption of palladium (II) chloride complexes on weakly, intermediate and strongly basic anion exchangers

The precious metals and their alloys are extensively applied in refineries and the chemical and electronic industries as well as in medicine. Their small amounts in nature and extensive exploitation from natural resources are a serious obstacle as far as their application is concerned. High prices of palladium favour its recovery from recyclable materials and industrial wastes. Ion-exchange chromatography is one of the physicochemical methods of noble metal ion recovery. A study was done on the possibility of selective removal of palladium (II) microquantities from the model 0.1-6.0 M HCl, 0.1-0.9 M HCl-0.9 - 0.1 M HNO₃, 1.0 M ZnCl₂ - 0.1 M HCl and 1.0 M AlCl₃-0.1 M HCl systems on weakly, intermediate and strongly basic anion exchangers. The sorption research of Pd (II) on various types of anion exchangers was carried out by means of dynamic and static methods. The working ion-exchange capacities, weight and bed distribution coefficients were calculated from the breakthrough curves of palladium (II) ions. From the static studies the recovery factors of Pd (II) depending on the anion exchanger-solution contact time in the model systems under discussion were determined.