Unveiling the Release Mechanism of Pollutants during the Crushing Process of Waste Printed Circuit Boards,ACS Sustainable Chemistry & Engineering

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Unveiling the Release Mechanism of Pollutants during the Crushing Process of Waste Printed Circuit Boards
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-10 , DOI: 10.1021/acssuschemeng.0c05017
Honghuai Sun ₁ , Bo Niu ₁ , Jie Guo ₁ , Rui Wang ₁ , Qingming Song ₁ , Ruitong Gao ₁ , Zhenming Xu _{1,

2}

Affiliation

Waste printed circuit boards (WPCBs) are hazardous wastes but also valuable resources. Mechanical crushing is widely used to recycle WPCBs. Some pollutants are released during the crushing, but the release mechanisms have been rarely reported. Herein, the experimentation results with the theoretical analysis can well explain the release mechanism of pollutants during the crushing of WPCBs. According to the size distribution of material in different crushing conditions, the collision analysis can describe the crushing process and illustrate the energy changes during the crushing. The energy changes in crack extension indicate that the reduced energy transferred to WPCBs results in a decrease in concentration and size of airborne particles with the crushing proceeding. Besides, the energy changes during the crushing illustrate the release mechanism of organic substances. In the early period of crushing, all branched chains on benzenes are broken to form phenol at the high energy. In the late period of crushing, phenol homologs are largely generated at the low energy. Moreover, the release behavior of triphenyl phosphate is relative to the accumulated energy during the crushing. This study provides a theoretical basis for the release of pollutants during the crushing process of WPCBs.

中文翻译：

揭示废印刷电路板破碎过程中污染物的释放机理

废印刷电路板（WPCB）是有害废物，但也是宝贵的资源。机械粉碎广泛用于回收WPCB。破碎过程中会释放一些污染物，但很少有释放机理的报道。这里，理论分析的实验结果可以很好地解释WPCB破碎过程中污染物的释放机理。根据不同破碎条件下物料的粒度分布，碰撞分析可以描述破碎过程，并说明破碎过程中的能量变化。裂纹扩展中的能量变化表明，随着破碎的进行，转移到WPCB的能量减少，导致空气中颗粒的浓度和尺寸减小。除了，破碎过程中的能量变化说明了有机物质的释放机理。在破碎的早期，苯上的所有支链都在高能下断裂形成苯酚。在粉碎的后期，苯酚同系物在低能量下大量产生。此外，磷酸三苯酯的释放行为与破碎过程中的累积能量有关。这项研究为WPCB粉碎过程中污染物的释放提供了理论基础。

更新日期：2020-09-28

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