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Formation Mechanisms and Leachability of Hexavalent Chromium in Cr2O3-Containing Refractory Castables of Electric Arc Furnace Cover

  • Yingjiang Wu
  • Shengqiang SongEmail author
  • Zhengliang Xue
  • Mithun Nath
Article
  • 80 Downloads

Abstract

Cr (III)-containing refractories are widely used as electric-arc furnace cover because of their excellent corrosion resistance properties. However, the formation of hexavalent chromium [Cr(VI)] remains a matter of concern during the service and subsequent disposal of the spent refractories. Moreover, the Cr(VI) formation mechanism and total amount of Cr(VI) generated are not clearly understood. In this study, samples from different parts of a spent electric arc furnace cover were collected from a local integrated steel plant. The phase composition, microstructure, formation and leachability of Cr(VI) were investigated using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy, and TRGS 613 leaching test (Technische Regeln für Gefahrstoffe-TRGS 613-October 2002)/multiple leaching tests. A Cr(VI)-containing phase namely CaCrO4 existed in the sample at a medium temperature range, while another Cr(VI)-containing phase namely hauyne (Ca4Al6CrO16) and a Cr(III)-containing phase (Al2O3–Cr2O3 solid solution) formed in the high temperature region. Concentrations of Cr(VI) in the leachates (as in the TRGS 613 procedure) exceeded the European permissible limit. During the leaching tests in an acid condition, Cr(VI) was reduced by Fe2+, which was primarily derived from the dissolution of FeO in the samples, while more Cr(VI) leached out with distilled water. Formation of an Al2O3–Cr2O3 solid solution can inhibit Cr(VI) generation.

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51604203) and the Hubei Chutian Scholar Program.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Yingjiang Wu
    • 1
    • 2
    • 3
  • Shengqiang Song
    • 1
    • 2
    • 3
    Email author
  • Zhengliang Xue
    • 1
    • 2
    • 3
  • Mithun Nath
    • 1
  1. 1.The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and TechnologyWuhanChina
  2. 2.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and TechnologyWuhanChina
  3. 3.Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary ResourcesWuhanChina

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