The aim of the study was to recover copper and lead metal from waste printed circuit boards (PCBs). The electrowinning method is found to be an effective recycling process to recover copper and lead metal from printed circuit board wastes. In order to simplify the process with affordable equipment, a simple ammonical leaching operation method was adopted. The selected PCBs were incinerated into fine ash powder at 500°C for 1 hour in the pyrolysis reactor. Then, the fine ash powder was subjected to acid-leaching process to recover the metals with varying conditions like acid-base concentration, electrode combination, and leaching time. The relative electrolysis solution of 0.1 M lead nitrate for lead and 0.1 M copper sulphate for copper was used to extract metals from PCBs at room temperature. The amount of lead and copper extracted from the process was determined by an atomic absorption spectrophotometer, and results found were 73.29% and 82.17%, respectively. Further, the optimum conditions for the recovery of metals were determined by using RSM software. The results showed that the percentage of lead and copper recovery were 78.25% and 89.1% should be 4 hrs 10 A/dm².

中文翻译：

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从印刷电路板废料中回收金属的优化研究。

该研究的目的是从废印刷电路板（PCB）中回收铜和铅金属。发现电沉积法是从印刷电路板废料中回收铜和铅金属的有效回收方法。为了简化使用负担得起的设备的过程，采用了一种简单的氨浸操作方法。将所选的多氯联苯在热解反应器中于500°C焚烧成灰烬细粉1小时。然后，对细灰粉进行酸浸处理，以改变酸碱浓度，电极组合和浸出时间等条件来回收金属。在室温下，使用0.1 M的铅硝酸铅和0.1 M的硫酸铜硫酸盐的相对电解溶液从PCB中提取金属。用原子吸收分光光度计测定从该工艺中提取的铅和铜的量，结果分别为73.29％和82.17％。此外，使用RSM软件确定了回收金属的最佳条件。结果表明，铅和铜的回收率分别为78.25％和89.1％应为4小时10 A / dm²。