Xu Jing, Tazawa Naoki, Kumagai Shogo, Kameda Tomohito, Saito Yuko, Yoshioka Toshiaki
Graduate School of Environmental Studies, Tohoku University 6-6-07 Aoba Aramaki-Aza, Aoba-ku Sendai Miyagi 980-8579 Japan
RSC Adv. 2018 Feb 13;8(13):6893-6903. doi: 10.1039/c8ra00301g. eCollection 2018 Feb 9.
Herein, we introduce a combination of plasticizer extraction from polyvinyl chloride (PVC) and ball milling for the simultaneous, effective recovery of PVC and copper (Cu) from thin electric cables. PVC coverings typically contain plasticizers for flexibility. As such, PVC cables become brittle after plasticizer extraction, causing them to be easily crushed by physical impact. Hence, we extracted the plasticizers from the PVC coverings of electric cables using organic solvents, and then crushed the obtained cable samples by ball milling. The influences of the plasticizer extraction yield and PVC morphologies before and after extraction on separation by ball milling were investigated. After a series of treatments to PVC coverings including quantitatively de-plasticizing for 5 h by Soxhlet-extraction in diethyl ether, 6 h ball milling and 1 h shaking in the sieve shaker, a maximum separation rate of 77% was achieved and the purity of the obtained separated Cu reached >99.8%.
在此，我们介绍了一种从聚氯乙烯（PVC）中提取增塑剂并结合球磨的方法，用于从细电缆中同时有效地回收PVC和铜（Cu）。PVC外皮通常含有增塑剂以增加柔韧性。因此，PVC电缆在增塑剂提取后会变脆，容易因物理冲击而被压碎。因此，我们使用有机溶剂从电缆的PVC外皮中提取增塑剂，然后通过球磨将获得的电缆样品粉碎。研究了增塑剂提取率以及提取前后PVC形态对球磨分离的影响。对PVC外皮进行了一系列处理，包括在乙醚中索氏提取定量脱塑5小时、球磨6小时以及在筛摇机中振荡1小时后，实现了最高77%的分离率，所得分离铜的纯度达到>99.8%。
