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Reactions of Chromium during the Calcination of Cement Clinker Produced Using Steel Slag

  • Cementitious Materials
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Abstract

We investigated the effects of calcination temperature (950–1 450 °C), steel slag content, and the total chromium content of steel slag on the Cr6+ contents of clinker samples produced using steel slags with different chromium contents. Additionally, the reactions of chromium in clinker (produced using steel slag) during calcination were studied. It is found that Cr6+ conversion increases with increasing calcination temperature to 1 250 °C, reaching a maximum of 43%–79%, before decreasing to 18%–42% at 1 450 C. Cr6+ is mainly formed by the oxidation of trivalent chromium (Cr3+) during the solid-phase reaction stage of clinker calcination. Furthermore, the Cr6+ content of a clinker sample is proportional to the chromium content of its raw meal precursor and is mainly in the form of water-insoluble calcium chromate (CaCrO4). The chromium in clinker is mainly distributed in tricalcium aluminate and tetracalcium aluminoferrite, however, some is present in silicate minerals. We expect to inform the monitoring and control of the Cr6+ content of clinker (produced using steel slag) and resulting cement.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Chenhai He  (何晨海) & Fuzhou Li

  2. Wuhan Rungong Technology Company Limited, Wuhan, 430070, China

    Bo Yan

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  1. Chenhai He  (何晨海)
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  2. Bo Yan
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  3. Fuzhou Li
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Correspondence to Chenhai He  (何晨海).

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All authors declare that there are no competing interests.

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He, C., Yan, B. & Li, F. Reactions of Chromium during the Calcination of Cement Clinker Produced Using Steel Slag. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 38, 834–841 (2023). https://doi.org/10.1007/s11595-023-2766-5

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  • DOI: https://doi.org/10.1007/s11595-023-2766-5

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