银钯合金靶材废料的综合回收研究

Research on the integrated recovery of waste AgPd alloy targets scraps

采用硝酸浸出-选择性分离钯-沉淀分离铟-抗坏血酸还原银的湿法工艺分离回收银钯合金靶材废料中贵金属银钯。结果表明,用4 mol/L硝酸,90℃加热,120 min即可完全浸出所有金属;浸出液采用理论量1.6倍的丁二酮肟可以完全沉淀分离99.9%以上的钯;将滤液调节至pH=5,其中的铟、铁、镓等可被沉淀分离得到纯净的硝酸银溶液;控制富银液pH 8~10,用0.8倍银质量的抗坏血酸可将银完全还原,银粉直收率大于96%。

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%.