Environment-Friendly Technology of Recovering Full Resources of Waste Capacitors

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• 作者：Jujun Ruan ; Jie Zheng ; Lipeng Dong ; Rongliang Qiu
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：5
• 期：1
• 页码：287-293
• 全文大小：416K
• ISSN：2168-0485

文摘

High quantities of waste printed circuit boards (PCBs) have been produced along with the generation of e-waste in the world. High purity metals were contained in waste PCBs. Recovery of waste PCBs caused serious pollution in China. With the view of environment protection, new technologies have been proposed to recover resources from basal boards of waste PCBs. Besides basal boards, waste PCBs contain many electronic components. However, little recovery technology was reported for electronic components. An environmental-friendly technology was proposed to recover waste capacitors of waste PCBs. The materials comprising waste capacitors were liberated by crushing. Then, ferrous metals (nickel alloy) and nonferrous metals (aluminum) were separated from crushed waste capacitors by magnetic/eddy current separation. Nickel alloy particles and aluminum particles can be sent to smelting plants. The optimized operation parameters of magnetic/eddy current separation were fed at speeds of 0.5 m/s, and the rotation speed of the magnetic field was 4.0 m/s. Nonmetallic materials of waste capacitors were translated to oils (boiling points <100 °C) by the method of vacuum pyrolysis. The oils were enriched in alkane, Si-CH₃ groups, and C–Cl groups and needed to be refined for purity organic products. This study contributed an environmental-friendly technology to treat electronic components of waste PCBs.