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Microwave treatment of electric arc furnace dust with Tetrabromobisphenol A: Dielectric characterization and pyrolysis-leaching

Al-Harahsheh, Mohammad; Kingman, S.W.; Hamilton, Ian S.

Authors

Mohammad Al-Harahsheh

SAM KINGMAN SAM.KINGMAN@NOTTINGHAM.AC.UK
Pro-Vice Chancellor Faculty of Engineering

Ian S. Hamilton



Abstract

In the present work microwave treatment of electric arc furnace dust (EAFD) mixed with tetrabromobisphenol A (TBBPA) was investigated. A range of characterization techniques were used to understand the thermal behaviour of TBBPA-EAFD mixtures under microwave pyrolysis conditions. Dielectric and thermal properties of EAFD, TBBPA and their mixtures were determined. Both the dielectric constant and loss factor of the mixture were found to vary considerably with temperature and subsequently it was found that the mixtures of these materials absorbed microwaves effectively, especially at temperatures above 170 °C. The high loss tangent of EAFD-TBBPA mixture above 170 °C resulted in fast heating and high temperatures (above 700 °C) resulting in reduction of Fe, Pb and Zn to their metallic form. This resulted in low recoveries of both Zn and Pb when the residue was leached in water. The recovery of Zn varied between 14 and 52 wt,%, while Pb recovery varied between 3 and 31 wt.% depending on microwave treatment efficiency. The low recovery of Zn and Pb could be ascribed by the reduction of metal oxides into their metallic form. More importantly this work has shown great selectivity in the leachability of both zinc and iron; with iron being left in the solid residue.

Citation

Al-Harahsheh, M., Kingman, S., & Hamilton, I. S. (2017). Microwave treatment of electric arc furnace dust with Tetrabromobisphenol A: Dielectric characterization and pyrolysis-leaching. Journal of Analytical and Applied Pyrolysis, 128, https://doi.org/10.1016/j.jaap.2017.10.013

Journal Article Type Article
Acceptance Date Oct 14, 2017
Online Publication Date Oct 16, 2017
Publication Date Nov 30, 2017
Deposit Date Oct 18, 2017
Publicly Available Date Mar 29, 2024
Journal Journal of Analytical and Applied Pyrolysis
Print ISSN 0165-2370
Electronic ISSN 0165-2370
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 128
DOI https://doi.org/10.1016/j.jaap.2017.10.013
Keywords EAFD; Dielectric Properties; Microwave treatment; Leaching; Zinc extraction; TBBPA
Public URL https://nottingham-repository.worktribe.com/output/897100
Publisher URL http://www.sciencedirect.com/science/article/pii/S016523701730534X

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