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Thermodynamic Simulation of Metal Reduction from B2O3–CaO–FeO–ZnO Melts by Hydrogen and Carbon Monoxide

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Abstract

The coreduction of iron and zinc from the B2O3–CaO–FeO–ZnO oxide melt by carbon monoxide or hydrogen is described by means of thermodynamic simulation in approximation to real processes; it provides batch addition of a reducing gas and removal of a metallic phase and waste gases. The calculations are carried out with allowance for the disproportionation of FeO into Fe and Fe3O4. For a mass ratio FeO/ZnO = 10, the disproportionation of FeO ensures the transition of 1.3–1.5 wt % Zn into gas. Upon addition of hydrogen or carbon monoxide to the system, the oxide melt composition is modified: the fractions of iron and zinc oxides decrease, but the degree of their metallization (φFe, φZn) increases. Complete (>99%) transition of zinc into a gas phase at 1773 K and 1673 K is detected upon addition of hydrogen in an amount of 36 and 65 dm3/kg, respectively, or of carbon monoxide in an amount of 58 and 80 dm3/kg, respectively. When hydrogen is used, the degree of iron metallization reaches 24.0–15.8% in the temperature range 1337–1573 K against 11.0–6.0% for carbon monoxide. The temperature increment in the considered VCO and \({{V}_{{{{{\text{H}}}_{2}}}}}\) flow rate ranges decreases the degree of metallization φFe. The obtained data can be used to adjust the conditions of treatment of oxide (slag) melts and to achieve the required degrees of metallization of zinc and iron.

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-29-24093mk.

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Authors and Affiliations

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

    A. S. Vusikhis, E. N. Selivanov, L. I. Leontyev & S. N. Tyushnyakov

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  1. A. S. Vusikhis
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  2. E. N. Selivanov
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  3. L. I. Leontyev
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  4. S. N. Tyushnyakov
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Correspondence to A. S. Vusikhis.

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Translated by I. Moshkin

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Vusikhis, A.S., Selivanov, E.N., Leontyev, L.I. et al. Thermodynamic Simulation of Metal Reduction from B2O3–CaO–FeO–ZnO Melts by Hydrogen and Carbon Monoxide. Russ. Metall. 2022, 475–480 (2022). https://doi.org/10.1134/S0036029522050111

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