Environmental Chemistry Letters

, Volume 17, Issue 3, pp 1375–1381 | Cite as

Mechanism of dry detoxification of chromium slag by carbon monoxide

  • Liwei He
  • Bin Li
  • Zhang Lin
  • Ping NingEmail author
  • Zhuang Shen
Original Paper


Dry detoxification is a major technology used at the industrial scale for remediation of chromium slag. However, the mechanism of this reaction is poorly known, in particular the kinetics and the role of minerals. Here, we studied elemental and mineralogical compositions during chromium slag detoxification by carbon monoxide, using data from X-ray powder diffraction, electron backscattered diffraction, energy-dispersive spectrometry and chemical analysis. The detoxification kinetics were studied by thermal analysis techniques using thermogravimetric and differential thermogravimetric analysis. Results show that the decomposition of Cr(VI)-containing minerals is responsible for the reduction process. The apparent activation energy is 41.36 kJ mol−1, from a calculation using the Flynn–Wall–Ozawa iso-conversional method.


Chromium slag detoxification Mineral variation Thermogravimetry and derivative thermogravimetry analysis 



This study was supported by the National Key Technology R&D Program of China (Grant 2017YFC0210500) and the Major Projects of Technical Innovation in Hubei Province of China (Grant 2017ACA092).

Supplementary material

10311_2019_868_MOESM1_ESM.docx (57 kb)
Supplementary material 1 (DOCX 56 kb)


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Faculty of Environmental Science and EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China
  2. 2.School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education)South China University of TechnologyGuangzhouPeople’s Republic of China

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