School of Chemistry and Chemical Engineering, Central South University, Changsha Hunan 410083, People's Republic of China.
Waste Manag. 2011 Dec;31(12):2569-76. doi: 10.1016/j.wasman.2011.07.002. Epub 2011 Aug 12.
Here, we focused on the recycling of waste printed circuit boards (WPCBs) using vacuum pyrolysis-centrifugation coupling technology (VPCT) aiming to obtain valuable feedstock and resolve environmental pollution. The two types of WPCBs were pyrolysed at 600°C for 30 min under vacuum condition. During the pyrolysis process, the solder of WPCBs was separated and recovered when the temperature range was 400-600°C, and the rotating drum was rotated at 1000 rpm for 10 min. The type-A of WPCBs pyrolysed to form an average of 67.91 wt.% residue, 27.84 wt.% oil, and 4.25 wt.% gas; and pyrolysis of the type-B of WPCBs led to an average mass balance of 72.22 wt.% residue, 21.57 wt.% oil, and 6.21 wt.% gas. The GC-MS and FT-IR analyses showed that the two pyrolysis oils consisted mainly of phenols and substituted phenols. The pyrolysis oil can be used for fuel or chemical feedstock for further processing. The recovered solder can be recycled directly and it can also be a good resource of lead and tin for refining. The pyrolysis residues contained various metals, glass fibers and other inorganic materials, which could be recovered after further treatment. The pyrolysis gases consisted mainly of CO, CO(2), CH(4), and H(2), which could be collected and recycled.
在这里，我们专注于使用真空热解-离心耦合技术（VPCT）回收废印刷电路板（WPCB），旨在获得有价值的原料并解决环境污染问题。将两种类型的 WPCB 在真空条件下于 600°C 下热解 30 分钟。在热解过程中，当温度范围在 400-600°C 时，WPCB 的焊料被分离并回收，并且旋转鼓以 1000rpm 的速度旋转 10 分钟。类型-A 的 WPCB 热解形成平均 67.91wt.%的残渣、27.84wt.%的油和 4.25wt.%的气体；而类型-B 的 WPCB 热解导致平均质量平衡为 72.22wt.%的残渣、21.57wt.%的油和 6.21wt.%的气体。GC-MS 和 FT-IR 分析表明，两种热解油主要由酚类和取代酚类组成。热解油可用作燃料或进一步加工的化学原料。回收的焊料可以直接回收，也可以作为精炼铅和锡的良好资源。热解残渣含有各种金属、玻璃纤维和其他无机材料，经过进一步处理后可以回收。热解气体主要由 CO、CO(2)、CH(4)和 H(2)组成，可以收集和回收。
