Abstract
Under the industrial operating conditions of a direct-current arc furnace in a temperature range of 1530–1650°C, the kinetics of cobalt decarburization by CoO additives is investigated. It is shown that, when the carbon concentration in the melt is lowered to 0.3–0.5%, the process rate is limited by the diffusion of carbon into the bulk of the liquid metal with activation energy of 58.74 kJ/mol. In the initial period of the process, the controlling stages are the saturation of the surface layer with oxygen and dissolution of CoO. To decrease the diffusion obstacles and shorten the duration of the final treatment of fire cobalt, it is recommended that convective flows in a bath be developed due to the increase in the current load.
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Kniss, V.A., Kazakov, P.V., and Zhukov, V.P., Tsvetn. Met., 2004, no. 2, pp. 8–11.
Zhukov, V.P., Kniss, V.A., and Avdeev, A.S., Tsvetn. Met., 2009, no. 6, pp. 26–29.
Zhukov, V.P., Kniss, V.A., and Avdeev, A.S., Tsvetn. Met., 2009, no. 10, pp. 26–29.
Lepinskikh, B.M., Kaibichev, A.V., and Savel’ev, Yu.A., Diffuziya elementov v zhidkikh metallakh gruppy zheleza (Diffusion of Elements in Liquid Metals of the Iron Group), Moscow: Nauka, 1974.
Bakanov, K.P., Barmotin, I.P., Vlasov, N.N., et al., Rafinirovanie stali intertnym gazom (Refining of Steel by an Inert Gas), Moscow: Metallurgiya, 1976.
Vanyukov, A.V. and Zaitsev, V.Ya., Teoriya pirometallurgicheskikh protsessov (Theory of Pyrometallurgic Processes), Moscow: Metallurgiya, 1986.
Levinskikh, Yu.V., Diagrammy sostoyaniya metallov s gazami (Phase Diagrams of Metals with Gases), Moscow: Metallurgiya, 1975.
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On the Jubilee of the Department of Metallurgy of Heavy Nonferrous Metals at Ural State Technical University
Original Russian Text © V.P. Zhukov, V. A. Kniss, S.V. Kniss, A.S. Avdeev, 2010, published in Izvestiya VUZ. Tsvetnaya Metallurgiya, 2010, No. 2, pp. 15–19.
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Zhukov, V.P., Kniss, V.A., Kniss, S.V. et al. Investigation of the kinetics of cobalt decarburization in a direct-current arc furnace. Russ. J. Non-ferrous Metals 51, 97–100 (2010). https://doi.org/10.3103/S1067821210020045
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DOI: https://doi.org/10.3103/S1067821210020045