Abstract Novel and simple flow-sheet has been reported to process integrated circuits (ICs) for effective recovery of metals. The depopulated ICs from waste PCBs were pulverised, beneficiated and leached in nitric acid. From the nitrate leach liquor, Fe was removed at pH 3.5, temperature 60 °C and air sparging. Subsequently, 99.99% Ag was precipitated as AgCl using 5% NaCl in mixing time 10 min. Further, 99.99% Cu was extracted from the filtrate using 20% LIX 984 N along with 2% isodecanol (ID) diluted in kerosene at pH 2.97, organic to aqueous phase ratio 1 in 10 min, leaving Ni in the raffinate. From the obtained pure solutions, salts of Cu and Ni could be produced using evaporation technique. The developed hydrometallurgical process flow-sheet to recover valuables from the nitrate leach liquor of waste ICs has the potential to be commercialised after pilot/ scale-up trial validations.

中文翻译：

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从废集成电路的硝酸浸出液中回收银、铜、镍、铁

摘要 据报道，新颖且简单的流程可用于处理集成电路 (IC) 以有效回收金属。从废 PCB 中去除的 IC 被粉碎、选矿并在硝酸中浸出。从硝酸盐浸出液中，在 pH 值为 3.5、温度为 60 °C 和空气鼓泡时去除 Fe。随后，在混合时间为 10 分钟内，使用 5% NaCl 以 AgCl 形式沉淀 99.99% Ag。此外，使用 20% LIX 984 N 和 2% 异癸醇 (ID) 在 pH 2.97 的煤油中稀释，在 10 分钟内有机相与水相的比例为 1，从滤液中提取 99.99% 的 Cu，将 Ni 留在残液中。从获得的纯溶液中，可以使用蒸发技术生产 Cu 和 Ni 的盐。