Sorption and Separation of Platinum and Rhodium in Presence of Transition Metals

Abstract

The present work is focused on ion exchange recovery of platinum (II, IV) and rhodium (III) from acidic chloride solutions in presence of some non-ferrous metal ions and iron (III). It was found out that 10-fold excesses of nickel (II), cobalt (II), copper (II) and zinc (II) have no interfering effect on sorption of noble metals, whereas 3-fold excesses of iron (III) can hinder this process and should be removed from the system. It was determined that platinum and rhodium can be separated and isolated from accompanying ions of non-ferrous metals and iron (III) by means of simultaneous sorption with subsequent selective elution by 2 M ammonium thiocyanate and 2 M hydrochloric acid solutions in columns