| The separation and recovery of Ag and Pd from the waste materials of Ag-Pd alloy targets was studied by the process of nitric acid leaching, Pd selective separation, In precipitation separation, and Ag reduction by ascorbic acid. The results showed that all the metals could be completely leached in the conditions of 4 mol/L nitric acid, 90℃ within 120 min. More than 99.9% of Pd can completely precipitated with 1.6 times theoretical amount of dimethylglyoxime (DMG) from leaching liquid. In, Ga and Fe can be effectively separated by adjusting the solution pH to 5. Silver powder then obtained from the pH 8~10 solution with 0.8 times ascorbic acid, silver can be completely reduced with powder recovery of above 96%. |
