Recycling of Waste Printed Circuit Boards by Microwave-Induced Pyrolysis and Featured Mechanical Processing
Recycling of Waste Printed Circuit Boards by Microwave-Induced Pyrolysis and Featured Mechanical Processing
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DOI：
10.1021/ie2013407
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发表时间：
2011-10-19
影响因子：
4.2
通讯作者：
Ma, Chunyuan
中科院分区：
文献类型：
--
作者：
Sun, Jing;Wang, Wenlong;Ma, Chunyuan
微波诱导热解与机械处理相结合是回收废弃印刷电路板的一种很有前途的方法。在热解过程中，WPCB平均产生78.6wt.%的固体残留物、15.7wt.%的油和5.7wt.%的气体。固体残渣含有丰富的金属；石油中含有丰富的苯酚和取代苯酚，可作为化学品或燃料回收；气体可燃，热值为4504千卡/米(3)。我们的特色机械处理，包括粉碎和特殊设计的沉浮分离，非常适合从热解残渣中回收金属。破碎步骤可解离99wt.%以上的金属，分离步骤的最终回收率可达95wt.%，金属品位可达96.5%。经济评估显示，这种综合处理方法利润惊人，非常有希望应对电子废料带来的挑战。
The combination of microwave-induced pyrolysis and mechanical processing is a promising way to recycle the waste printed circuit boards (WPCBs). In pyrolysis, WPCBs yield an average of 78.6 wt.% solid residues, 15.7 wt.% oil, and 5.7 wt.% gas. The solid residues are rich in metals; the oil is abundant with phenol and substituted phenols which can be reclaimed as chemicals or fuels; and the gas is combustible with a caloric value of 4504 kcal/m(3). Our featured mechanical processing, including crushing and specially designed sink-float separation, is very suitable for metal reclamation from the pyrolysis residues. Over 99 wt.% of metals can be dissociated by the crushing step; the final recycling rate and grade of metals in the separation step can amount to 95 wt.% and 96.5%, respectively. The economic assessment reveals that the combined treatment is amazingly profitable and very promising to tackle the challenges posed by the electronic scraps.