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Effects of MgO and Al2O3 Addition on Redox State of Chromium in CaO-SiO2-CrO x Slag System by XPS Method

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Abstract

The effects of MgO and Al2O3 on the redox state of chromium in CaO-SiO2-CrO x system have been investigated at 1873 K (1600 °C) under Ar-CO-CO2 atmosphere and analyzed by means of X-ray photoelectron spectroscopy. From the analysis of the Cr 2p core level spectra, it was found that both Cr(II) and Cr(III) exist simultaneously in CaO-MgO/Al2O3-SiO2-CrO x , and the quantitative ratio Cr(II)/Cr(III) has been obtained by deducing from the area under the computer-resolved peaks. Substitutions of CaO by MgO, SiO2 by Al2O3 favored the Cr(II) state existing in the system in the composition ranges of 3 to 10 wt pct MgO and 5 to 20 pct Al2O3. Meanwhile, from the analysis of the O1s spectra in CaO-MgO-SiO2-CrO x , it was found that the ratio of the non-bridging oxygen content increased first due to the CrO contribution to the electron distribution uniformly as O− at MgO low content. Afterward, it went to decreasing with continuing addition of MgO because ionic contribution of MgO is less than that of CaO and the influence of the CrO clustering on the non-Bridging oxygen is limited due to only 5 wt pct CrO x . In CaO-Al2O3-SiO2-CrO x system, Cr(II) acts as a network modifier to compensate Al3+ charge balance to make the structure stable, so the non-bridge oxygen in this system continues decreasing.

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Acknowledgments

The authors would like to express their appreciation to National Nature Science Foundation of China (No. 51104013, No. 51174022), a Fundamental Research Funds for the Central Universities (FRF-TP-14-109A2), Beijing Higher Education Young Elite Teacher Project (YETP0349), and China Postdoctoral Science Foundation (2014M560046).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Haidian District, Beijing, 100083, P.R. China

    Li-jun Wang (Associate Professor), Ji-peng Yu (Master Student) & Kuo-chih Chou (Professor)

  2. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Li-jun Wang (Associate Professor), Ji-peng Yu (Master Student) & Kuo-chih Chou (Professor)

  3. Royal Institute of Technology Sweden, 10044, Stockholm, Sweden

    Seshadri Seetharaman (Professor)

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  1. Li-jun Wang
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  2. Ji-peng Yu
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  4. Seshadri Seetharaman
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Correspondence to Li-jun Wang.

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Manuscript submitted November 16, 2014.

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Wang, Lj., Yu, Jp., Chou, Kc. et al. Effects of MgO and Al2O3 Addition on Redox State of Chromium in CaO-SiO2-CrO x Slag System by XPS Method. Metall Mater Trans B 46, 1802–1808 (2015). https://doi.org/10.1007/s11663-015-0353-7

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