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Experimental investigation of the influence of reaction atmosphere on the pyrolysis of printed circuit boards
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 204, p. 1065-1073Article in journal (Refereed) Published
Abstract [en]

Printed circuit boards (PCB) are one of the most challenging fractions of waste electrical and electronic equipment (WEEE) in terms of recycling due to their complexity and diversity. Pyrolysis seems to be a promising alternative for production of energy carriers from its organic fraction with simultaneous recovery of metals. Reaction atmosphere is among the process parameters that affects the thermal decomposition as well as the products’ formation and distribution. In this study, the decomposition of two different PCB fractions in inert and steam atmospheres has been investigated by means of thermogravimetric analysis (TGA) and lab scale fixed bed reactor experiments. It was found that the decomposition of the tested materials in steam atmosphere starts at lower temperatures and proceeds slower compared to the N2 atmosphere. Moreover, a two-step decomposition has been observed on the PCB sockets fraction due to the fact that high amount of antimony oxide was present, a common additive for improving the flame retardancy, which have been also observed on previous studies (Wu et al., 2014). The presence of steam influence the pyrolysis gas composition and promotes additional vaporisation of antimony as verified by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, the liquid fraction has been qualitatively analysed using a GC/MS in order to determine the brominated compounds as well as other compounds that are produced from this process.

Place, publisher, year, edition, pages
Elsevier Ltd , 2017. Vol. 204, p. 1065-1073
Keywords [en]
Antimony, Printed circuit boards, Pyrolysis, TGA, Waste electrical and electronic equipment (WEEE), Chemical reactors, Decomposition, Electronic equipment, Electronic Waste, Metal recovery, Oscillators (electronic), Scanning electron microscopy, Thermogravimetric analysis, Timing circuits, X ray diffraction, Brominated compounds, Experimental investigations, Lower temperatures, Powder X ray diffraction, Printed circuit boards (PCB), Process parameters, Reaction atmospheres, Waste electrical and electronic equipment, complexity, PCB, reaction kinetics, recycling, thermal decomposition, X-ray diffraction
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-218890DOI: 10.1016/j.apenergy.2017.04.087Scopus ID: 2-s2.0-85019150889OAI: oai:DiVA.org:kth-218890DiVA, id: diva2:1175048
Note

QC 20180117

Available from: 2018-01-17 Created: 2018-01-17 Last updated: 2018-01-17Bibliographically approved

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Evangelopoulos, PanagiotisKantarelis, EfthymiosYang, Weihong
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