Fundamental Study of Palladium Recycling Using “Dry Aqua Regia” Considering the Recovery from Spent Auto-catalyst

Abstract In this research, a recycling process for palladium using “dry aqua regia,” which consists of iron(III) chloride–potassium chloride, was proposed. Palladium dissolved in and the recovered by leaching with potassium chloride solution added ammonium nitric acid. almost completely 3 h at 600 K, recovery ratio up to 80%. addition, dissolution coexistence platinum platinum-palladium alloy regia” were also tested. The separated solid–liquid separation technique difference solubility their compounds sodium solutions. As result, pure each element recovered. This result suggested possibility platinum-group metals. Graphical