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Thermodynamic Modeling of Metal Desulfurization with Boron-Containing Slags of the CaO–SiO2–MgO–Al2O3–B2O3 System

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Abstract

In thermodynamic modeling of the desulfurization of steel by CaO–SiO2–MgO–Al2O3–B2O3 slag on the basis of HSC 6.12 Chemistry software (Outokumpu), the influence of the temperature (1500–1700°C), the slag basicity (2–5), and the B2O3 content (1–4%)1 on the desulfurization is analyzed. It is found that the sulfur content is reduced with increase in the temperature from 1500 to 1700°C, within the given range of slag basicity. At 1600°C, the sulfur content in the metal is 0.0052% for slag of basicity 2; at 1650°C, by contrast, its content is 0.0048%. Increase in slag basicity from 2 to 5 improves the desulfurization, which increases from 80.7 to 98.7% at 1600°C. If the B2O3 content in the slag rises, desulfurization is impaired. At 1600°C, the sulfur content in the metal may be reduced to 0.0052 and 0.0098% when using slag of basicity 2 with 1 and 4% B2O3, respectively; in the same conditions but with slag of basicity 5, the corresponding values are 0.00036 and 0.00088%, respectively. Note that desulfurization is better for slag without B2O3. According to thermodynamic modeling, metal with 0.0039 and 0.00019% S is obtained at 1600°C when using slag of basicity 2 and 5, respectively, that contains no B2O3. The results obtained by thermodynamic modeling for the desulfurization of metal by CaO–SiO2–MgO–Al2O3–B2O3 slag of basicity 2–5 in the range 1500–1700°C are consistent with experimental data and may be used in improving the desulfurization of steel by slag that contains boron.

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Authors and Affiliations

  1. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia

    V. A. Salina, A. V. Sychev, V. I. Zhuchkov & A. A. Babenko

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  1. V. A. Salina
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  2. A. V. Sychev
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  3. V. I. Zhuchkov
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  4. A. A. Babenko
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Correspondence to V. A. Salina.

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Original Russian Text © V.A. Salina, A.V. Sychev, V.I. Zhuchkov, A.A. Babenko, 2017, published in Izvestiya Vysshikh Uchebnykh Zavedenii, Chernaya Metallurgiya, 2017, No. 12, pp. 955–959.

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Salina, V.A., Sychev, A.V., Zhuchkov, V.I. et al. Thermodynamic Modeling of Metal Desulfurization with Boron-Containing Slags of the CaO–SiO2–MgO–Al2O3–B2O3 System. Steel Transl. 47, 768–771 (2017). https://doi.org/10.3103/S0967091217120117

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