Separation of copper and polyvinyl chloride from thin waste electric cables: A combined PVC-swelling and centrifugal approach
Separation of copper and polyvinyl chloride from thin waste electric cables: A combined PVC-swelling and centrifugal approach
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从细废电缆中分离铜和聚氯乙烯：PVC 溶胀和离心相结合的方法
DOI：
10.1016/j.wasman.2019.03.049
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发表时间：
2019
期刊：
影响因子：
8.1
通讯作者：
Toshiaki Yoshioka
中科院分区：
文献类型：
--
作者：
Jing Xu;Shogo Kumagai;Tomohito Kameda;Yuko Saito;Kenshi Takahashi;Hiroshi Hayashi;Toshiaki Yoshioka
报废车辆和电子电气设备产生的废电缆在环境保护和资源回收方面存在重大问题。本文详细介绍了一种新型的废旧细电缆回收方法，通过将聚氯乙烯（PVC）溶胀和离心分离相结合，同时回收PVC和高纯铜。PVC覆盖物在环境温度下在有机溶剂中溶胀，这在覆盖物和铜线之间产生间隙并促进离心分离。100%分离电缆（12 g），并且通过在100-mL丙酮或乙酸乙酯中搅拌来提取超过95%的增塑剂，这促进了铜、PVC覆盖物和增塑剂的单独回收。相比之下，用IOmL乙酸丁酯和90 mL水的混合物实现了>97%的分离，其中增塑剂的提取<10%。回收了高纯度的铜和控制增塑剂含量的PVC，这对于回收铜和PVC都是非常有利的。
Waste electric cables from end-of-life vehicles and electronic and electrical equipment present a significant problem in terms of environmental protection and resource recycling. Herein we detail a novel recycling method for thin waste electric cables, by combining polyvinyl chloride (PVC) swelling and centrifugal separation to simultaneously recover PVC and high-purity copper. PVC coverings were swollen in an organic solvent at ambient temperatures, which creates a gap between the covering and the copper wire and facilitates centrifugal separation. Electric cables (12 g) were 100% separated, and more than 95% of the plasticizer was extracted by stirring in 100-mL acetone or ethyl acetate that facilitated the separate recovery of copper, the PVC covering, and the plasticizer. In contrast, >97% separation, with <10% extraction of the plasticizer, was achieved with a mixture of 10 mL butyl acetate and 90 mL water. High-purity copper and PVC with controlled plasticizer content were recovered, which is highly advantageous for recycling both copper and PVC.