A new theory of metallurgical slag has been developed based on a detailed study of the thermodynamic properties of various slag systems having various complexity levels, as well as various ideas regarding associativity. This theory has, for the first time, enabled: the reactivity (component activities), phase equilibrium conditions, and important physical and chemical properties such as viscosity, surface tension, and thermal conductivity to be described to an accuracy level consistent with, or better than that of the experimental results (2–3%); enabled slag vitrification capacity to be predicted; and enabled precipitation of fluorides (which are considered environmentally undesirable) to be predicted. This has enabled us to develop new, environmentally-friendly slag generation mixtures for continuous casting of steel having excellent operational characteristics, develop appropriate methods for calculation of equilibria and reaction yields for the metal–slag–gas system, and develop appropriate methods for management of slag conditions during in-ladle steel processing. This in turn led to the development of efficient processes for production of high-quality bulk steels with excellent service characteristics and low levels of continuouscast billet and rolled-stock rejection based on surface defects and ultrasonic defectoscopy results.
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References
A. I. Zaitsev and K. B. Kalmykov, “Areas and methods for production of casting powders for continuous casting of high-performance steel with good environmental characteristics,” Proc. 9th Congr. of Steelmakers [in Russian] (2007), pp. 638–644.
N. P. Lyakishev, A. I. Zaitsev, N. E. Zaitseva, et al., “Design fundamentals for fundamentally new, high-performance casting powders to prevent occurrence of surface defects in cast billets and to increase the range of steels and alloys that can be cast using a continuous steel casting machine,” in: Materials from the Int. Conf. on Processes and Equipment for Out-of-Furnace Processing and Continuous Casting of Steel [in Russian], Teploenergetik, Moscow (2006), pp. 82–89.
N. P. Lyakishev, N. A. Arutyunyan, A. I. Zaitsev, et al., “Mechanism for formation of slag-skull surface roughness and the effect of such surface roughness on the thermal resistance of the gap between the surface of the billet and the mold wall in a continuous steel casting machine,” Metally, No. 3, 3–15 (2005).
A. V. Leites, Protection of Steel during Continuous Casting [in Russian], Metallurgiya, Moscow (1984), 200 pp.
A. I. Zaitsev, B. N. Mogutnov, and E. Kh. Shakhpazov, Physical Chemistry of Metallurgical Slags [in Russian], Interkontakt Nauka, Moscow (2008), 352 pp.
A. I. Zaitsev and B. M. Mogutnov, Liquid Slags as Associated Solutions. Fundamental Research on the Physical Chemistry of Metallic Melts [in Russian], IKTs Akademkniga, Moscow (2002), pp. 228–246.
Y. Bottinga, D. F. Weill, and P. Richet, Thermodynamics of Minerals and Melts, Springer Verlag, Berlin (1981), 207 pp.
S. A. Dembovskii and E. A. Chetkina, Vitrification, Nauka, Moscow (1990), 279 pp.
L. I. Staffanson and Du Sichen, Scand. J. Metall., 21, 165 (1992).
A. I. Zaitsev, and B. M. Mogutnov, “A general approach to thermodynamics of high-temperature liquid solution,” High Temp. Mater. Sci., 34, No. 1/3, 155–171 (1995).
I. Prigogine and R. Defay, Chemical Thermodynamics, Nauka, Novosibirsk (1966), 385 pp.
V. M. Denisov, N. V. Belousova, S. A. Istomin, et al., Structure and Properties of Molten Oxides, Ural Department, Russian Academy of Sciences, Ekaterinburg (1999), 498 pp.
A. I. Zaitsev and N. E. Zaitseva, “Thermodynamic approach to the analysis of vitrification of melts and prediction of compositions prone to amorphization,” Izv. Rossiisk. Akad. Nauk, Ser. Fiz., 65, No. 10, 1390–1401 (2001).
A. I. Zaitsev, A. D. Litvina, N. P. Lyakishev, and B. M. Mogutnov, “Thermodynamics of CaO–Al2O3–SiO2 and CaF2–CaO–Al2O3–SiO2 melts,” J. Chem. Soc., Faraday Trans., 93, No. 17, 3089–3098 (1997).
A. I. Zaitsev, A. V. Leites, and A. L. Liberman, “Physical and chemical foundations of a new method for controlling heat removal from an ingot to the mold,” Stal, No. 3, 70–74 (2003).
A. I. Zaitsev, A. V. Leites, A. D. Litvina, and B. N. Mogutnov, Steel Res., 65, No. 9, 368–374 (1994).
E. Kh. Shakhpazov, A. I. Zaitsev, A. A. Nemtinov, et al., “Modern directions in the development of ladle metallurgy and the problem of non-metallic inclusions in steel,” Metally, No. 1, 3–13 (2007).
A. I. Zaitsev, I. G. Rodionova, N. G. Shaposhnikov, et al., “Thermodynamic study and modeling of iron-based melts for adequate prediction of modern ladle metallurgy processes,” J. Phys. Conf. Series, 98, P. N 032003, 5 (2008).
E. Kh. Shakhpazov, A. I. Zaitsev, N. G. Shaposhnikov, and I. G. Rodionova, “Model for controlling processes in the ladle treatment of steel,” Metallurg, No. 6, 30–35 (2008).
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Translated from Metallurg, No. 5, pp. 27–31, May, 2009.
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Zaitsev, A.I., Shakhpazov, E.K. Development of a modern theory for metallurgical slag. Metallurgist 53, 255 (2009). https://doi.org/10.1007/s11015-009-9171-y
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DOI: https://doi.org/10.1007/s11015-009-9171-y