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The effects of alkaline earth metal ions and halogen ions on the chromium oxide activities in alkaline earth metal oxide-halide-Cr2O3 system fluxes

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Abstract

The solid electrolyte cell — Mo|Cr + Cr2O3‖ZrO2(MgO)‖{Cu-Cr}alloy + (Cr2O3)fluxes|Mo+ is used at 1673 K to determine Cr2O3 activities in MO-MX 2-Cr2O3 (M = Ca2+, Ba2−, X = F− or Cl−) ternary fluxes, which are in equilibrium with the copper-chromium binary alloy. The ternary isothermal phase diagrams of CaO-CaF2-Cr2O3 and BaO-BaCl2-Cr2O3 system fluxes are inferred on the basis of the experimental results and binary phase diagrams. The results indicate that Cr2O3 activities in all fluxes always decrease with the increase of the X MO /X MX2 ratio. Partial replacement of BaO in BaO-BaF2-Cr2O3 fluxes by CaO is acceptable for economy and efficiency considerations. At the same time, partial substitution of BaO for CaO in CaO-CaF2-Cr2O3 fluxes is advantageous for phosphorus removal and chromium retention as a result of the increased Cr2O3 activities, increased basicities, and widening of the liquid zones. Compared to those in BaO-BaF2-Cr2O3 fluxes, Cr2O3 activities in CaO-CaF2-Cr2O3 fluxes approximately follow the same curve as the former, although the position and the width of the liquid zones are considerably different, and activities in BaO-BaCl2-Cr2O3 fluxes are higher at the lower Cr2O3 content, or vice versa. The activity coefficients of Cr2O3 in the fluxes decrease with the increase of the X MO /X MX 2 ratios.

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Authors and Affiliations

  1. the Department of Ferrous Metallurgy, School of Materials and Metallurgy, Northeastern University, 110006, Shenyang, China

    Lian-Fu Li (Lecturer), Mao-Fa Jiang (Professor) & Wen-Zhong Wang (Professor)

  2. the Technology Center, Baosteel, 201900, Shanghai, China

    Zhao-Ping Chen (Senior Engineer)

Authors
  1. Lian-Fu Li
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  2. Mao-Fa Jiang
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  3. Wen-Zhong Wang
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  4. Zhao-Ping Chen
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Li, LF., Jiang, MF., Wang, WZ. et al. The effects of alkaline earth metal ions and halogen ions on the chromium oxide activities in alkaline earth metal oxide-halide-Cr2O3 system fluxes. Metall Mater Trans B 31, 469–475 (2000). https://doi.org/10.1007/s11663-000-0153-5

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  • DOI: https://doi.org/10.1007/s11663-000-0153-5

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