Recycling metals from waste printed circuit boards (WPCBs) has significant economic value. Pyrolysis pretreatment was proposed to improve the flotation efficiency of WPCBs. The pyrolysis characteristics of different components were determined by thermogravimetry, which was used to determine the suitable pyrolysis temperature. Furthermore, the effects of pyrolysis on morphology, element content, phase and functional group composition of WPCBs particle were analyzed by SEM + EDS, XRD and FT-IR, respectively. Subsequently, flotation tests were carried out to determine the influence of pyrolysis on the flotation behavior of WPCBs. SEM and XRD results show that pyrolysis pretreatment has no significant effect on the surface morphology, element composition and phase composition of the WPCBs. FT-IR results indicate that pyrolysis can significantly weaken the absorption peak of organic particles due to slight carbonization. Flotation results illustrate that the pyrolysis significantly improves the floatability of the organic components, and the float yield is increased from 6.35 % to 96.36 %. Thus, pyrolysis treatment can improve the flotation efficiency due to the greater impurity removal rate. This study provides a simple and economical pretreatment approach to enhance the flotation accuracy of different components in WPCBs.

从废印刷电路板 (WPCB) 中回收金属具有重要的经济价值。提出了热解预处理以提高 WPCBs 的浮选效率。通过热重法测定不同组分的热解特性，从而确定合适的热解温度。此外，分别通过SEM+EDS、XRD和FT-IR分析了热解对WPCBs颗粒形貌、元素含量、物相和官能团组成的影响。随后，进行了浮选试验以确定热解对 WPCB 浮选行为的影响。SEM和XRD结果表明热解预处理对WPCBs的表面形貌、元素组成和相组成没有显着影响。FT-IR 结果表明，热解可以显着减弱有机颗粒由于轻微碳化而产生的吸收峰。浮选结果表明，热解显着提高了有机组分的可浮性，浮选率由6.35%提高到96.36%。因此，热解处理可以提高浮选效率，因为杂质去除率更高。本研究提供了一种简单且经济的预处理方法，以提高 WPCB 中不同成分的浮选精度。热解处理可以提高浮选效率，因为有更大的杂质去除率。本研究提供了一种简单且经济的预处理方法，以提高 WPCB 中不同成分的浮选精度。热解处理可以提高浮选效率，因为有更大的杂质去除率。本研究提供了一种简单且经济的预处理方法，以提高 WPCB 中不同成分的浮选精度。