Gao Ruitong, Xu Zhenming
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 20092, PR China.
J Hazard Mater. 2019 Feb 15;364:1-10. doi: 10.1016/j.jhazmat.2018.09.096. Epub 2018 Oct 9.
The rapid replacement of electric and electronic equipment has produced large amount of waste printed circuit boards (WPCBs). At present, physical and mechanical methods are widely used to recover valuable metals from WPCBs. Unfortunately, produced nonmetal materials (NMMs) were typically hazardous waste and were usually disposed by landfill. Considering the characteristics of structure and composition of NMMs, debromination pyrolysis was regarded as the appropriate technique to decompose organics. However, pyrolysis oil and pyrolysis residue were still typically hazardous and difficult to disposal or recycle. Hence, we proposed a novel integrated method to reuse NMMs. The results showed that temperature-controlled condensation method was effective to separate pyrolysis oil. Besides, bromine was removed from organics and formed CaBr. Pyrolysis oil was used to synthesize oil-based resin. FT-IR, H and C NMR and TG analysis results indicated that oil-based resin had the same structure and thermostability with commercial resin, which suggested that oil-based rein had economic value. In addition, CaBr in residual could be recycled by water leaching and filter residues can be used as ideal reinforcing material for building materials. This study raises a comprehensive method to utilize NMMs and recover value materials effectively, sustainably and environmentally friendly.
电气和电子设备的快速更新换代产生了大量废弃印刷电路板（WPCBs）。目前，物理和机械方法被广泛用于从WPCBs中回收有价金属。不幸的是，产生的非金属材料（NMMs）通常是危险废物，通常通过填埋进行处置。考虑到NMMs的结构和组成特点，脱溴热解被认为是分解有机物的合适技术。然而，热解油和热解残渣仍然通常具有危险性，难以处置或回收利用。因此，我们提出了一种新型的综合方法来再利用NMMs。结果表明，温控冷凝法对分离热解油有效。此外，溴从有机物中脱除并形成CaBr。热解油用于合成油基树脂。傅里叶变换红外光谱（FT-IR）、氢核磁共振（H NMR）、碳核磁共振（C NMR）和热重分析（TG）结果表明，油基树脂与商业树脂具有相同的结构和热稳定性，这表明油基树脂具有经济价值。此外，残渣中的CaBr可通过水浸回收，滤渣可作为建筑材料的理想增强材料。本研究提出了一种综合方法，以有效、可持续和环境友好的方式利用NMMs并回收有价材料。
