Abstract Present research reports a novel and feasible process to recover Ag and generate concentrate of precious metals (Au, Pd and Pt) from waste ICs present in PCBs of computers. Initially, depopulated ICs were pulverized and beneficiated to obtain metallic concentrate, which contained (per ton) 7 Kg Ag, 5 Kg Au, 110 g Pd and 4 g Pt along with Cu, Pb, Fe and Ni. Leaching was carried out and found that at optimized condition i.e. 3 M HNO3, temperature 80 °C, pulp density 50 g/L and mixing time 1 h, >90% of Ag, Cu, Pb and Ni were leached leaving Au, Pt and Pd in the residue. From the leach liquor, Ag was precipitated using 1 M KCl in 30 min and other metals were recovered by precipitation, solvent extraction and cementation methods. All wastes (solid/ liquid) generated during process development could be treated using standard environmental procedure.

中文翻译：

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废集成电路 (IC) 的湿法冶金处理以回收 Ag 并生成 Au、Pd 和 Pt 的混合精矿

摘要 目前的研究报告了一种新颖可行的工艺，可以从计算机 PCB 中的废弃 IC 中回收 Ag 并生成贵金属（Au、Pd 和 Pt）浓缩物。最初，将人口减少的 IC 粉碎和选矿以获得金属精矿，其中包含（每吨）7 公斤银、5 公斤金、110 克钯和 4 克铂以及铜、铅、铁和镍。进行浸出并发现在优化条件下，即 3 M HNO3、温度 80 °C、纸浆密度 50 g/L 和混合时间 1 h，> 90% 的 Ag、Cu、Pb 和 Ni 被浸出，留下 Au、Pt 和残留物中的 Pd。从浸出液中，使用 1 M KCl 在 30 分钟内沉淀出银，并通过沉淀、溶剂萃取和置换方法回收其他金属。