| In anhydrous N,N-dimethylformamide (DMF) solvent, palladium was extracted by oxidizing copper chloride (CuCl2). Using single factor test and response surface optimization method, the optimal leaching conditions were studied. The results showed that palladium existed in the form of Pd(II) in the leaching solution, and that the leaching rate of palladium increased with CuCl2 concentration, leaching temperature, leaching time, and the solid-liquid ratio. Under the optimized conditions: CuCl2 concentration of 1.25 mol/L, solid-to-liquid ratio of 1:700 g/mL, and leaching 90 min at 80°C, the leaching rate of palladium can reach 98.5%. By adding diacetyloxime to the leaching solution, 96.3% of palladium and 5% of copper can be precipitated. The proposed method can provide a reference for the recovery of palladium from electronic waste. |
