Abstract
Thermodynamic analysis is applied to the physicochemical processes in the converter bath when intensifying bath heating by means of gas–oxygen burners. In the converter’s working space, when the combustion flames interact with the liquid bath, the oxygen and natural gas supplied through the burners and the oxygen supplied through the tuyere interact in a bubbling slag–metal emulsion. As a result, iron and the impurities are oxidized. The use of such burners changes the gas composition: not only O2, CO, and CO2 are present, but also H2 and H2O, which changes the oxidative capacity of the gas phase. The presence of solid carbon (for example, pulverized coal) in the burner flame may be used to control and intensify the combustion process. Combustion is most effective in the oxidation of carbon to CO when the oxygen excess is less than 1.0. The oxidation conditions of carbon in the melt change with variation in its activity as a function of its concentration and the temperature. The equilibrium in the M–O–C system may be described by the oxygen partial pressure \({P_{{O_2}}}\), which may be regarded as a universal characteristic. In addition, the equilibrium may be assessed on the basis of the associated ratios \({P_{CO}}/{P_{C{O_2}}}\) and \({P_{{H_2}}}/{P_{{H_2}O}}\) It is found that iron may be oxidized by oxygen and, to some extent, by carbon dioxide. At 1600–2000 K, there is practically no oxidation of iron by steam. The carbon dissolved in the steel is oxidized relatively effectively by oxygen and carbon dioxide until its concentration is less than 0.1% C. Steam oxidizes carbon very poorly and is not much more effective with manganese and silicon. With increase in temperature, the rate at which carbon dissolved in steel is oxidized by oxygen increases, while the oxidation rate of manganese and silicon falls. Above 1800 K, superoxidized slag with a high FeO content actively oxidizes silicon (to <2% Si), manganese (to <1% Mn), and carbon (to <1.5% C).
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Solonenko, V.V., Protopopov, E.V., Feiler, S.V., and Yakushevich, N.F., Oxidation of molten impurities in converters by means of combustion flames: thermodynamic principles. 1. Thermodynamic analysis of processes in natural-gas combustion, Steel Transl., 2017, vol. 47, no. 7, pp. 449–455.
Chernyatevich, A.G., Aizatulov, R.S., Gal’perin, G.S., Gress, A.V., Protopopov, E.V., Ganzer, L.A., and Zolotukhin, N.R., USSR Inventor’s Certificate no. 1560566, Byull. Izobret., 1990, no. 16.
Tulin, N.A., Morozov, A.N., Kravtsov, N.F., Markov, B.L., and Kirsanov, A.A., Operation of 130t oxygen furnaces with preheating of the scrap by gas-oxygen burners, Steel USSR, 1974, vol. 4, no. 5, pp. 356–358.
Bowden, J.J., US Patent 3479178A, 1966.
Nugumanov, R.F., Protopopov, E.V., and Chernyatevich, A.G., Prospective technologies for preheating scrap in the cavity of the converter, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2009, no. 2, pp. 63–66.
Jalkanen, H., Experiences in phsicochemical modelling of oxygen converter process (BOF), Shon Int. Symp. “Advanced Processing of Metals and Materials,” Pittsburgh, PA: Miner., Met. Mater. Soc., 2006, vol. 2, pp. 541–554.
Trentini, B., Scrap consumption in the oxygen converter, Steel Times, 1985, vol. 12, pp. 608–610.
Protopopov, E.V., Lavrik, A.N., and Ganzer, L.A., Mathematical model of hydrodynamics and gas transport in gas-slag and gas-metal phases in a converter with combined blowing, Vestn. Gorno-Metall. Sekts. Ross. Akad. Estestv. Nauk, Otd. Metall., 2001, no. 10, pp. 45–54.
Kubisek, K. and Frohberg, M.G., Hydrodynamische Modelluntersuchungen zum bodenblasender Converter, Arch. Eisenhüttenw., 1981, vol. 4552, no. 1, pp. 7–14.
Baptizmanskii, V.I., Borisov, Yu.N., Lonskii, A.M., Trubavin, V.I., Makhnitskii, V.A., and Bulavka, O.A. Wave formation in the converter with a combined blowing, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 1987, no. 8, pp. 21–24.
Chatterjee, A., On some aspects of supersonic jets of interest in LD Steelmaking, Iron Steel, 1972, vol. 45, no. 6, pp. 627–634.
Klein, H., Liesch, I., Iso, H., and Nakamura, K., Scrap ratio increase by coal injection in the BOF, Steelmaking Proc., 1983, vol. 68, pp. 129–136.
Goedert, F., Klein, H., Henrion, R., et al., The ALCI Technology: ARBED lance coal injection, Fachber. Huettenprax. Metallweiterverarb., 1986, vol. 24, no. 4, pp. 214–219.
Zaitsev, A.I., Mogutnov, B.M., and Shakhpazov, E.Kh., Fizicheskaya khimiya metallurgicheskikh shlakov (Physical Chemistry of Metallurgical Slags), Moscow: Interkontakt Nauka, 2008.
Elliott, J.F., Gleiser, M., and Ramakrishna, V., Thermochemistry for Steelmaking, Reading, Mass: Addison-Wesley, 1963.
Schlackenatlas, Düsseldorf: Stahleisen, 1981.
Belov, N.A., Diagrammy sostoyaniya troinykh i chetvernykh sistem: uchebnoe posobie dlya vuzov (State Diagrams of Triple and Quad Systems: Manual for Higher Education Institutions), Moscow: Mosk. Inst. Stali Splavov, 2007.
Termodinamicheskie svoistva individual’nykh veshchestv (Thermodynamic Properties of Individual Substances), Glushko, V.P., Ed., Moscow: Nauka, 1979–1982, vols. 1–6.
Tolstoguzov, N.V., Teoreticheskie osnovy i tekhnologiya plavki kremnistykh i margantsevykh splavov (Theoretical Bases and Technology of Melting of Siliceous and Manganese Alloys), Moscow: Metallurgiya, 1992.
Turkdogan, E.T., Physical Chemistry of High Temperature Technology, London: Academic, 1980.
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Original Russian Text © V.V. Solonenko, E.V. Protopopov, S.V. Feiler, M.V. Temlyantsev, N.F. Yakushevich, 2017, published in Izvestiya Vysshikh Uchebnykh Zavedenii, Chernaya Metallurgiya, 2017, No. 10, pp. 811–819.
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Solonenko, V.V., Protopopov, E.V., Feiler, S.V. et al. Oxidation of molten impurities in converters by means of combustion flames: Thermodynamic principles. 2. Interaction of flame with metal and slag in converter bath. Steel Transl. 47, 650–657 (2017). https://doi.org/10.3103/S0967091217100084
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DOI: https://doi.org/10.3103/S0967091217100084