Effect of chemical pretreatment on pyrolysis of non-metallic fraction recycled from waste printed circuit boards

Waste Management
Yafei Shen

Abstract

The non-metallic fraction from waste printed circuit boards (NMF-WPCB) generally consists of plastics with high content of Br, glass fibers and metals (e.g. Cu), which are normally difficult to dispose. This work aims to study the chemical pretreatments by using alkalis, acids and alkali-earth-metal salts on pyrolysis of NMF-WPCB. Char (60-79%) and volatile matter (21-40%) can be produced via the pyrolysis process. In particular, the ash content can reach up to 42-56%, which was attributed to the high content of glass fibers and other minerals. Copper (Cu, 2.5%), calcium (Ca, 28.7%), and aluminum (Al, 6.9%) were the main metal constituents. Meanwhile, silicon (Si, 28.3%) and bromine (Br, 26.4%) were the predominant non-metallic constituents. The heavy metals such as Cu were significantly reduced by 92.4% with the acid (i.e. HCl) pretreatment. It has been proved that the organic Br in the plastics (e.g. BFR) can be transformed into HBr via the pyrolysis process at relatively high temperature. It was noteworthy that the alkali pretreatment was more benefit for the Br fixation in the solid char. Particularly, the Br fixation efficiency can reach up to 53.6% by the sodium hydroxide (NaOH) pretreatment with the pyrolysis process. Th...Continue Reading

References

Dec 25, 2007·Chemosphere·Guido GrauseToshiaki Yoshioka
Mar 24, 2009·Journal of Hazardous Materials·Jiuyong GuoZhenming Xu
Jan 23, 2010·Environmental Science & Technology·Jia Li, Zhenming Xu
Aug 9, 2011·Waste Management·Luciana Harue YamaneJorge Alberto Soares Tenório
Oct 1, 2013·Environmental Science & Technology·Mengjun ChenJiukun Hu
Oct 7, 2014·Journal of Hazardous Materials·Pejman HadiGordon McKay
Jan 15, 2016·Waste Management·Yafei ShenMindong Chen
Mar 5, 2016·Journal of Hazardous Materials·Wu-Jun LiuHan-Qing Yu
Jun 13, 2018·The Science of the Total Environment·Aurora SolerNuria Ortuño

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Citations

Jan 7, 2020·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Jingjing XiongZhitong Yao
Apr 10, 2021·Environmental Science and Pollution Research International·Chuanjin GuanXueying Gao

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