Recovery of Pure Pd(II) from Spent Electroplating Solutions by Solvent Extraction with Ionic Liquids from Sulfuric Acid Leaching Solution of Cemented Pd

Palladium (Pd) electroplating is widely practiced in the manufacture of advanced electronic devices. The Pd(II) present spent solutions treated by cementation with zinc (Zn) metal powder. In order to recover pure Pd from cemented Pd, a process that consisted leaching followed solvent extraction was investigated. For this purpose, experiments using synthesized ionic liquids (ILs) organic and inorganic anions were performed find separation conditions at which selective over Zn(II) synthetic H2SO4 possible. concentration sulfuric acid varied 0.5 9 M. complete ILs such as ALi–CY301 (N-methyl-N,N,N-trioctylammonium bis(2,4,4-trimethylpentyl) dithiophosphinic), ALi–SCN thiocyanate), ALi–I iodide) ALi–Br bromide) depends on concentration, while ALi–LIX63 5,8-diethyl-7-hydroxydodecane-6-oxime) ALi–LIX84 2-hydroxy-5-nonylacetophenone oxime) can completely separate irrespective concentration. Additionally, mixture HCl thiourea, aqua regia solution, NH3 solution NH4Cl are powerful stripping agents for loaded ALi–LIX63/ALi–LIX84, ALi–CY301, ALi–Br/ALi–I ALi–SCN, respectively. However, application real 5 M indicated it difficult two ions ALi–LIX84. Use NaClO an oxidizing agent during resulted enhancement Therefore, removal chloride necessary apply obtained solutions.