A new technology for recycling materials from waste printed circuit boards.
A new technology for recycling materials from waste printed circuit boards.
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DOI：
10.1016/j.jhazmat.2009.10.083
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发表时间：
2010-03
影响因子：
13.6
通讯作者：
Yihui Zhou;Ke-qiang Qiu
中科院分区：
文献类型：
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作者：
Yihui Zhou;Ke-qiang Qiu
废弃印刷电路板（WPCB）是一种重要的二次资源，同时也是一种环境污染物。本研究采用“离心分离+真空热解”的新工艺从废弃印刷线路板中联合回收焊锡和有机物。离心分离结果表明，在240°C下加热，转鼓以1400 rpm间歇旋转6 min，焊料与WPCB的分离完全。真空热解的结果表明，无焊料的A型WPCB的热解形成的平均69.5wt%的残渣，27.8wt%的油，和2.7wt%的气体;和无焊料的B型WPCB的热解导致的平均质量平衡的残渣，20.0wt%的油，和4.3wt%的气体。热解残余物含有各种金属、玻璃纤维和其他无机材料，可回收用于进一步加工。热解油可用作燃料或化学原料，并且热解气体可被收集和燃烧用于热解自我维持。这种清洁无污染的技术为回收利用废弃印刷线路板中的有价物质，有效防止废弃印刷线路板对环境的污染提供了新的途径。
Waste printed circuit boards (WPCBs) contain lots of valuable resources together with plenty of hazardous materials, which are considered both an attractive secondary resource and an environmental contaminant. In this research, a new process of “centrifugal separation+vacuum pyrolysis” for the combined recovery of solder and organic materials from WPCBs was investigated. The results of centrifugal separation indicated that the separation of solder from WPCBs was complete when WPCBs were heated at 240°C, and the rotating drum was rotated at 1400rpm for 6min intermittently. The results of vacuum pyrolysis showed that the type-A of WPCBs without solder pyrolysed to form an average of 69.5wt% residue, 27.8wt% oil, and 2.7wt% gas; and pyrolysis of the type-B of WPCBs without solder led to an average mass balance of 75.7wt% residue, 20.0wt% oil, and 4.3wt% gas. The pyrolysis residues contain various metals, glass fibers and other inorganic materials, which could be recycled for further processing. The pyrolysis oils can be used for fuel or chemical feedstock and the pyrolysis gases can be collected and combusted for the pyrolysis self-sustain. This clean and non-polluting technology offers a new way to recycle valuable materials from WPCBs and prevent the environmental pollution of WPCBs effectively.