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Thermodynamic Analysis on the Oxidative Pyrolytic Treatment of Electric Arc Furnace Dust–TBBA Blends

Authors
  • Al-Harahsheh, Mohammad1
  • Altarawneh, Mohammednoor2, 3
  • 1 Jordan University of Science and Technology, Chemical Engineering Department, Irbid, 22110, Jordan , Irbid (Jordan)
  • 2 Murdoch University, School of Engineering and Information Technology, Perth, WA, 6150, Australia , Perth (Australia)
  • 3 Al-Hussein Bin Talal University, Chemical Engineering Department, Ma’an, Jordan , Ma’an (Jordan)
Type
Published Article
Journal
Oxidation of Metals
Publisher
Springer US
Publication Date
Dec 05, 2018
Volume
91
Issue
5-6
Pages
561–588
Identifiers
DOI: 10.1007/s11085-018-9883-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

This contribution reports a thermodynamic assessment for the bromination of electric arc furnace dust (EAFD) by-products sourced from thermal degradation of tetrabromobisphenol A (TBBA); i.e., the most widely deployed brominated flame retardant. Upon TBBA’s pyrolysis, HBr is released in conjunction with several volatile organic compounds leaving a solid carbonaceous residue. EAFD contains appreciable quantities of zinc, iron, and lead oxides. These oxides can react with HBr to form volatile metal bromides when the EAFD is added to the TBBA as a bromination agent. The selective bromination of zinc and lead contained in EAFD was thermodynamically evaluated under both oxidative and inert pyrolytic conditions while considering the effects of several variables. These factors span temperature, loads of TBBA, the presence of oxidizing agent, and the effect of the presence of other common EAFD’s constituents such as sodium, potassium, calcium, silicon, and sulfur. It was found that a 100% extraction (based on thermodynamic feasibility) of both zinc and lead can be achieved for a mixture containing 60% EAFD and 40% TBBA (contaminated with minor amounts of iron) when pyrolyzed under inert conditions. However, when a thermal treatment is performed in the presence of oxygen, complete thermodynamic-based recovery of zinc and lead recoveries can be achieved at a lower temperature with no iron content. Removal of sodium and potassium chloride from EAFD prior to pyrolysis by washing, under oxidizing condition, can also result in a profound selectivity in zinc and lead bromination. The behavior of other elements during bromination process was also discussed.

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