Strength degradation mechanism of iron coke prepared by mixed coal and Fe2O3

Chen Yin, Shuxing Qiu, Shengfu Zhang, Farooq Sher, Hua Zhang, Jian Xu, Liangying Wen

Research output: Contribution to journalArticle

Abstract

Iron coke, as a new type of blast furnace burden is helpful for energy saving, emission reduction and green production of iron making. This study aims to investigate the strength degradation mechanism of iron coke prepared by mixed coal and Fe2O3 to provide a theoretical direction to improve its strength. Coking and pyrolysis experiments of mixed coal and Fe2O3 were carried out between 400 and 500 ℃ temperature. Gieseler plastometer and derivative thermogravimetric (DTG) showed that added Fe2O3 inhibited the thermoplasticity and pyrolysis process of mixed coal during coking. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) results showed that added Fe2O3 decreased the aromaticity and average stacking height, but increased the interlayer spacing of crystallite, aliphatic chain length and hydrocarbon-generating potential of mixed coal during coking. Further, gas chromatography-mass spectrometer (GCMS) analysis suggested that the added Fe2O3 inhibited the cleavage of CalO, CalS, CalN, CalCar and CalCal bonds, reduced the generation of ethylbenzene, o-xylene and unbranched alkanes with carbon atoms in 24–26, thus decreased the amount of fluid phase generated in coking and ultimately degraded the strength of iron coke.
Original languageEnglish
Article number104897
JournalJournal of Analytical and Applied Pyrolysis
Volume150
Early online date1 Aug 2020
DOIs
Publication statusPublished - Sep 2020

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Analytical and Applied Pyrolysis. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Analytical and Applied Pyrolysis, 150, (2020) DOI: 10.1016/j.jaap.2020.104897

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Iron coke
  • Strength degradation
  • Thermoplastic behavior
  • Structure transformation
  • Pyrolysis

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