A novel dismantling process of waste printed circuit boards using water-soluble ionic liquid.
A novel dismantling process of waste printed circuit boards using water-soluble ionic liquid.
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DOI：
10.1016/j.chemosphere.2013.06.063
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发表时间：
2013-10
期刊：
影响因子：
8.8
通讯作者：
Xianlai Zeng;Jinhui Li;H. Xie;Lili Liu
中科院分区：
文献类型：
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作者：
Xianlai Zeng;Jinhui Li;H. Xie;Lili Liu
废弃印刷电路板（wpcb）的回收工艺在科学研究和实地试点方面已经很好地建立。然而，由于其低效率和对环境和人类健康的负面影响，目前的wpcb拆解程序限制了回收过程。这项工作旨在通过使用水溶性离子液体加热分离电子元件和锡焊料，从两种主要类型的wpcb（阴极射线管和计算机主机）中寻求一种环保的拆卸过程。本文系统地研究了拆装过程中拆装焊点的影响因素、加热机理和最佳参数，并对拆装过程中拆装焊点的环境性能和经济评价进行了探讨。结果表明，在拆解过程中，最佳温度为250℃，最佳滞留时间为12 min，最佳湍流度为45 rpm。在最佳实验条件下，wpcb中电子元件的分离率接近90%。这种新工艺为分离电子元件和回收锡焊料提供了大规模工业操作的可能性，并为wpcb的回收提供了更有效和环保的工艺。
Recycling processes for waste printed circuit boards (WPCBs) have been well established in terms of scientific research and field pilots. However, current dismantling procedures for WPCBs have restricted the recycling process, due to their low efficiency and negative impacts on environmental and human health. This work aimed to seek an environmental-friendly dismantling process through heating with water-soluble ionic liquid to separate electronic components and tin solder from two main types of WPCBs—cathode ray tubes and computer mainframes. The work systematically investigates the influence factors, heating mechanism, and optimal parameters for opening solder connections on WPCBs during the dismantling process, and addresses its environmental performance and economic assessment. The results obtained demonstrate that the optimal temperature, retention time, and turbulence resulting from impeller rotation during the dismantling process, were 250 °C, 12 min, and 45 rpm, respectively. Nearly 90% of the electronic components were separated from the WPCBs under the optimal experimental conditions. This novel process offers the possibility of large industrial-scale operations for separating electronic components and recovering tin solder, and for a more efficient and environmentally sound process for WPCBs recycling.