Recovery of materials from waste printed circuit boards by vacuum pyrolysis and vacuum centrifugal separation.
Recovery of materials from waste printed circuit boards by vacuum pyrolysis and vacuum centrifugal separation.
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DOI：
10.1016/j.wasman.2010.06.012
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发表时间：
2010-11
期刊：
影响因子：
8.1
通讯作者：
Yihui Zhou;Wenbiao Wu;Ke-qiang Qiu
中科院分区：
文献类型：
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作者：
Yihui Zhou;Wenbiao Wu;Ke-qiang Qiu
本研究采用真空热解和真空离心分离两步法处理废弃印制电路板。首先，在实验室规模的反应器中，在600℃的真空条件下热解30min。然后，将得到的热解残渣在真空下加热，直到焊料熔化，然后利用离心力将熔融的焊料从热解残渣中分离出来。真空热解结果表明，A型WPCB(其基板由纤维素纸增强酚醛树脂制成)裂解生成平均67.97wt.%的残渣、27.73wt.%的油和4.30wt.%的气体，而B型的WPCB(其基板由玻璃纤维增强的环氧树脂制成)的平均质量平衡为72.20wt.%、21.45wt.%和6.35wt.%。真空离心分离结果表明，当热解残渣在400℃加热，转鼓转速1200rpm旋转10min时，焊料完全分离。热解油气经处理后可作为燃料或化工原料。分离焊料后的热解残渣中含有各种金属、玻璃纤维等无机物，可以回收利用进行深加工。回收的焊料可以直接再利用，也可以作为精炼用的铅锡的良好来源。
In this research, a two-step process consisting of vacuum pyrolysis and vacuum centrifugal separation was employed to treat waste printed circuit boards (WPCBs). Firstly, WPCBs were pyrolysed under vacuum condition at 600°C for 30min in a lab-scale reactor. Then, the obtained pyrolysis residue was heated under vacuum until the solder was melted, and then the molten solder was separated from the pyrolysis residue by the centrifugal force. The results of vacuum pyrolysis showed that the type-A of WPCBs (the base plates of which was made from cellulose paper reinforced phenolic resin) pyrolysed to form an average of 67.97 wt.% residue, 27.73 wt.% oil, and 4.30 wt.% gas; and pyrolysis of the type-B of WPCBs (the base plates of which was made from glass fiber reinforced epoxy resin) led to an average mass balance of 72.20 wt.% residue, 21.45 wt.% oil, and 6.35 wt.% gas. The results of vacuum centrifugal separation showed that the separation of solder was complete when the pyrolysis residue was heated at 400°C, and the rotating drum was rotated at 1200rpm for 10min. The pyrolysis oil and gas can be used as fuel or chemical feedstock after treatment. The pyrolysis residue after solder separation contained various metals, glass fibers and other inorganic materials, which could be recycled for further processing. The recovered solder can be reused directly and it can also be a good resource of lead and tin for refining.