This work proposed a novel strategy for recovering Ag, Cu, and Ni from waste silver contacts (WSCs) using polyiodide ionic liquids (ILs). Our method exhibited exceptional leaching efficiency (Ag: 98.7%, Cu: 99.1%) and remarkable reusability (over 6 cycles). In contrast to a traditional three‐step leaching‐extraction‐striping process, our polyiodide ILs present a significant simplification. This approach is ideal for practical applications due to its low viscosity (49.6 cP) and gentle (55°C) leaching conditions of polyiodide ILs. Additionally, the redox leaching mechanism was successfully elucidated by XPS, XRD, and UV‐vis spectra. Based on our findings, a closed‐loop route for the recovery and separation of Ag, Cu, and Ni was suggested. Moreover, economic analysis revealed that the recovery of 1.0 kg WSCs could generate a considerable profit of 58 ± 7 USD. Overall, this new method provides a rapid, high profit, and sustainable recovery strategy with significant potential for industrial applications.

中文翻译：

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使用聚碘化物离子液体从废银触点中回收银、铜和镍的新且简便的策略

这项工作提出了一种使用聚碘离子液体 (IL) 从废银触点 (WSC) 中回收银、铜和镍的新策略。我们的方法表现出卓越的浸出效率（Ag：98.7％，Cu：99.1％）和显着的可重复使用性（超过6个循环）。与传统的浸出-萃取-反萃三步流程相比，我们的聚碘离子液体显着简化。由于聚碘离子液体的低粘度 (49.6 cP) 和温和 (55°C) 浸出条件，该方法非常适合实际应用。此外，氧化还原浸出机理已通过 XPS、XRD 和紫外可见光谱成功阐明。根据我们的研究结果，提出了回收和分离银、铜和镍的闭环路线。此外，经济分析显示，回收1.0公斤WSC可产生58±7美元的可观利润。总体而言，这种新方法提供了一种快速、高利润和可持续的恢复策略，具有巨大的工业应用潜力。