Abstract
The oxidation of large octahedral single crystals of magnetite extracted from chlorite shale at Shabrovsk talc mine (Middle Urals) is experimentally studied. Differential heating curves show that the processes occurring in the oxidative roasting of magnetite (Fe3O4) are highly reproducible. The mechanism of martensite oxidation is considered, as well as the temperature ranges corresponding to exothermal and endothermal reactions. The thermal effect of martensite oxidation is determined from that of a standard (CaCO3) and the areas under the differential heating curves on the corresponding thermograms. Those areas are proportional to the thermal effect. The results obtained are of considerable interest: knowing the temperature range of martensite oxidation, the heat sources in the various technological zones of the conveyer roasting machines may be taken into account in establishing the roasting conditions, thereby optimizing the thermal conditions and reducing the fuel consumption.
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References
Yur’ev, B.P. and Spirin, N.A., Oxidation of iron-ore pellets, Steel Transl., 2011, vol. 41, no. 5, pp. 400–403.
Readman, P.W. and O’Reilly, W., Oxidation processes in titanomagnetites, Z. Geophis., 1971, vol. 37, no. 3, pp. 329–338.
Gorbachev, V.A., Abzalov, V.M., and Yur’ev, B.P., Conversion of magnetite to hematite in iron-ore pellets, Steel Transl., 2007, vol. 37, no. 3, pp. 336–338.
Bulakh, A.G., Zolotarev, A.A., and Krivovichev, V.G., Obshchaya mineralogiya (General Mineralogy), Moscow: Akademiya, 2008.
Malysheva, T.Ya., Yusfin, Yu.S., and Plotnikov, S.V., Pellet production from magnetite ore, Steel Transl., 2011, vol. 41, no. 9, pp. 705–707.
Plotnikov, S.V. and Bormotov, A.S., Phase transformation mechanism at oxidation burning of industrial pellets, produced from iron quartzite ores, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2011, no. 3, pp. 29–32.
Kokorin, L.K. and Leleko, S.N., Proizvodstvo okislennykh okatyshei: tekhnologiya, oborudovanie (Production of Oxidizing Pellets: Technology and Equipment), Yekaterinburg: Marat, 2004.
Abzalov, V.M. and Yur’ev, B.P., Thermodynamics of sintering of iron ore pellets, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2010, no. 2, pp. 11–13.
Mehrer, H., Diffusion in Solids. Fundamentals, Methods, Materials, Diffusion-Controlled Processes, Berlin: Springer-Verlag, 2007.
Frank-Kamenetskii, D.A., Osnovy makrokinetiki. Diffuziya i teploperedacha v khimicheskoi kinetike (Basic of Macrokinetics. Diffusion and Heat Transfer in Chemical Kinetics), Moscow: Intellekt, 2008.
Yur’ev, B.P., Heat transfer in a bed of iron-ore pellets, Steel Transl., 2010, vol. 40, no. 4, pp. 330–333.
Volkov, A.I. and Zharskii, I.M., Termodinamicheskie kharakteristiki veshchestv: spravochnik (Thermodynamic Characteristics of Substances: Handbook), Moscow: Bukmaster, 22014.
Lidin, R.A., Andreeva, L.L., and Molochko, V.A., Konstanty neorganicheskikh veshchestv: spravochnik (Constants of Nonorganic Substances: Handbook), Moscow: Drofa, 2006.
Kiper, R.A., Fiziko-khimicheskie svoistva veshchestv: spravochnik po khimii (Physical and Chemical Properties of Substances: Handbook on Chemistry), Khabarovsk: Prondo, 2013.
Esin, O.A. and Gel’d, P.V., Fizicheskaya khimiya pirometallurgicheskikh protsessov (Physical Chemistry of Pyrometallurgical Processes), Sverdlovsk: Metallurgizdat, 1962, part 1.
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Original Russian Text © B.P. Yur’ev, V.A. Goltsev, 2016, published in Izvestiya Vysshikh Uchebnykh Zavedenii, Chernaya Metallurgiya, 2016, No. 10, pp. 735–739.
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Yur’ev, B.P., Goltsev, V.A. Oxidation of magnetite. Steel Transl. 46, 718–721 (2016). https://doi.org/10.3103/S0967091216100144
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DOI: https://doi.org/10.3103/S0967091216100144