Recovery of materials from waste printed circuit boards by vacuum pyrolysis and vacuum centrifugal separation

Waste Management
Yihui ZhouKeqiang Qiu

Abstract

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 30 min 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 1200 rpm for 10 min. 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 fi...Continue Reading

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Citations

Jul 24, 2014·Waste Management·R CayumilV Sahajwalla
Oct 7, 2014·Journal of Hazardous Materials·Pejman HadiGordon McKay
Oct 1, 2013·Environmental Science & Technology·Mengjun ChenJiukun Hu
Jun 1, 2012·Waste Management·Manis Kumar JhaJinki Jeong
Sep 13, 2011·Waste Management·Angela C KasperHugo M Veit
Nov 20, 2014·Environmental Science & Technology·Lu Zhan, Zhenming Xu
Nov 26, 2015·Journal of Hazardous Materials·Yang Jian-GuangShi Wei-Qiang
Apr 11, 2014·Environment International·Qingbin Song, Jinhui Li
Mar 19, 2014·Journal of Hazardous Materials·Kuo-Hsiung Lin, Hung-Lung Chiang
Mar 30, 2017·Topics in Current Chemistry·Chao NingGordon McKay
Jan 18, 2017·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Abhishek Kumar AwasthiJinhui Li
Nov 23, 2019·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Rahul BaidyaSeung-Whee Rhee
Feb 25, 2019·Environmental Science and Pollution Research International·Lie YangZulin Zhang
Jun 26, 2021·Environmental Pollution·Junghee JooJechan Lee

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