Tremendous generation of e-waste and its illegal recycling are causing immense threat to environment as well as the loss of precious metals. The present research reports a novel hybrid process for the total recovery of gold from small depopulated components of e-waste. Connectors and integrated circuits (ICs) liberated from printed circuit boards (PCBs) were pulverized and processed for gold leaching using 10 g/L sodium cyanide solution at 40 °C and mixing time 15 min, where more than 95% gold was found to be leached out in single stage. From the obtained leach liquor, gold metal was recovered by charcoal adsorption followed by heat treatment. The raffinate left after adsorption of gold was found to contain ~10 mg/L gold, which was also recovered using Amberlite IRA 400Cl at equilibrium pH 9.6 in 30 min maintaining aqueous/resin (A/R) ratio 25 mL/g. The raffinate solution was enriched to 882.41 mg/L and the solution was further processed to get metal/salt using cementation/ evaporation. Obtained leached residue is processed for non-ferrous metals recovery and finally disposed-off after treatment and TCLP test. The effluent left after leaching could be easily decomposed and treated in ETP using standard environmental procedure.

中文翻译：

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从设备的废弃电子元件中回收黄金

电子垃圾的大量产生及其非法回收正在对环境造成巨大威胁以及贵金属的损失。本研究报告了一种新的混合工艺，用于从电子垃圾的少量人口减少的成分中完全回收黄金。从印刷电路板 (PCB) 中分离出来的连接器和集成电路 (IC) 被粉碎并使用 10 g/L 氰化钠溶液在 40 °C 和混合时间 15 分钟下进行浸金处理，发现超过 95% 的金是单级浸出。从得到的浸出液中，通过活性炭吸附和热处理回收金金属。发现吸附金后留下的萃余液含有约 10 mg/L 的金，在平衡 pH 值为 9 时也使用 Amberlite IRA 400Cl 回收。6 在 30 分钟内保持水/树脂 (A/R) 比为 25 mL/g。萃余液浓缩至 882.41 mg/L，并使用胶结/蒸发进一步处理该溶液以得到金属/盐。得到的浸出渣进行有色金属回收处理，经处理和TCLP检测后最终处置。浸出后留下的流出物可以使用标准的环保程序在 ETP 中轻松分解和处理。