Speciation of chromium in swarf during pyrolysis

Hsin Liang Huang, Hong-Paul Wang, Yu Ling Wei, C. J.G. Jou, Wen Chung Lu, James I.C. Chang

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Speciation of chromium in swarf wastes pyrolyzed at 673-873 K has been studied by X-ray absorption spectroscopy in the present work. The least-square fitted X-ray absorption near edge structural (XANES) spectrum shows that Cr 3 C 2 (84%) was the main chromium species in the untreated swarf. A small amount of CrO 3 and Cr 2 O 3 was also found. During pyrolysis at 673-873 K, Cr (35%) and FeCr 2 O 4 (24%) were formed with disappearance of about 43% of Cr 3 C 2 in the swarf. By extended X-ray absorption fine structural (EXAFS) spectroscopy, we found that metallic Cr (with Cr{single bond}Cr bond distances of 2.56-2.59 Å) was formed during pyrolysis. At least two reaction paths might be involved during pyrolysis at 673-873 K: (1) reduction of Cr 3 C 2 to metallic Cr and (2) formation of FeCr 2 O 4 via reactions of chromium oxides and iron oxides.

Original languageEnglish
Pages (from-to)2039-2041
Number of pages3
JournalRadiation Physics and Chemistry
Issue number11 SPEC. ISS.
Publication statusPublished - 2006 Jan 1

All Science Journal Classification (ASJC) codes

  • Radiation

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    Huang, H. L., Wang, H-P., Wei, Y. L., Jou, C. J. G., Lu, W. C., & Chang, J. I. C. (2006). Speciation of chromium in swarf during pyrolysis. Radiation Physics and Chemistry, 75(11 SPEC. ISS.), 2039-2041. https://doi.org/10.1016/j.radphyschem.2005.10.039