Copper is one of the main elements used in printed circuit boards (PCBs) of electronic products. This study aims to find a way to make the supercritical CO₂ extraction method more efficient for copper recovery from PCBs waste. For this purpose, supercritical water was applied to PCBs waste as a Pre-treatment process to increase the concentration of copper during the initial solid feed. To increase copper's solubility in CO₂, the solvents methanol, ethanol, propanol solvents were used along with complexing agents of cyanide 301, 302 and tri-butyl phosphate. Investigations were carried out to determine the effects of static/dynamic times, as well as pressure and temperature on extraction efficiency. Consequently, cyanide 301 and methanol were selected as best ligand and co-solvent, respectively. The optimum condition, in which Copper Extraction Efficiency reached 97 % with high purity (98.7 %), was obtained at 60 °C temperature, 200 bar pressure, 30 min residence time, and 1 ml/min CO₂ flow rate.

铜是电子产品印刷电路板（PCB）中使用的主要元素之一。这项研究旨在找到一种方法，使超临界CO ₂提取方法对于从多氯联苯废物中回收铜更加有效。为此，将超临界水作为预处理过程应用于PCBs废物，以增加初始固体进料期间的铜浓度。增加铜在CO _2中的溶解度，将溶剂甲醇，乙醇，丙醇溶剂与氰化物301、302和磷酸三丁酯的络合剂一起使用。进行了研究以确定静态/动态时间以及压力和温度对提取效率的影响。因此，氰化物301和甲醇分别被选为最佳配体和助溶剂。在60°C的温度，200 bar的压力，30分钟的停留时间和1 ml / min的CO ₂流速下获得了最佳条件，其中铜的提取效率达到97％的高纯度（98.7％）。