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Characterization of Spent Printed Circuit Boards from Computers

机译：计算机中花费印刷电路板的特征

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The pollution caused by the spent printed circuit boards (PCBs) is currently a concern of researchers and environmental managers due to its large quantity and exceptionally complex properties. This study characterized printed circuit boards (PCBs) from discarded computers using a number of characterization techniques, including chemical analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), granulometric analysis and scanning electron microscopy (SEM). The PCBs contain approximately 50 wt% metals, 25 wt% glass fibers and 25 wt% polymers. The principal metals include copper, calcium, tin, aluminum, zinc and lead. They are still wrapped by brominated epoxy resin after the PCBs are preliminarily crushed. As precious metals, such as gold and silver, are barely found in the PCBs, copper and tin are the main metallic elements of recycling value which warrants extra attention.
机译：花费印刷电路板（PCB）引起的污染目前是研究人员和环境管理人员的关注，因为它的数量大而且非常复杂。本研究表征了使用许多表征技术的丢弃计算机的印刷电路板（PCB），包括化学分析，X射线衍射（XRD），傅里叶变换红外光谱（FTIR），粒度分析和扫描电子显微镜（SEM）。 PCB含有约50wt％金属，25wt％玻璃纤维和25wt％的聚合物。主要金属包括铜，钙，锡，铝，锌和铅。在PCB初步压碎后，它们仍然被溴化环氧树脂包裹。作为金和银等贵金属，几乎没有发现在PCB中，铜和锡是回收价值的主要金属元素，保证额外关注。

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