Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

A. S. Kharchenko, Dr. Eng., Associate Prof., Head of the Dept. of Metallurgy and Chemical Engineering, e-mail: as.mgtu@mail.ru
V. I. Sysoev, Cand. Eng., Head of Laboratory of the Dept. of Metallurgy and Chemical Engineering, e-mail: v.sysoev@magtu.ru
S. K. Sibagatullin, Dr. Eng., Prof., Dept. of Metallurgy and Chemical Engineering, e-mail: 10tks@mail.ru
A. V. Dzyuba, Postgraduate Student, Dept. of Metallurgy and Chemical Engineering, e-mail: dzyuba.98@bk.ru

Phase transitions of oily scale components were studied using differential scanning calorimetry on a NETZSCH STA (Jupiter 449 F3) synchronous thermal analysis instrument under continuous heating to 1450 °C at a rate of 10 °C/min in an argon atmosphere. Heat absorption due to water evaporation (230.3 kJ/kg) occurred in the temperature range of 65–148 °C. The resulting thermal effect in the intense oil evaporation temperature range from 170 to 480 °C was slightly exothermic and amounted to 25.4 kJ/kg due to amorphous phase crystallization processes. At the Curie point of magnetite (590.2 °C), the endothermic effect was 12.8 kJ/kg; in the temperature range from 745 to 857 °C, it was 75.6 kJ/kg due to the reduction of magnetite to wustite by residual carbon; during localized reduction of FeO to metallic iron at a temperature of 1141.7 °C, it was 10.5 kJ/kg; and in the wustite melting temperature range of 1367–1412 °C, with continued reduction of FeO, it was 189.2 kJ/kg. The equivalent heat capacity was calculated for various temperature ranges. For conditions in the upper zone of intensive heat exchange, the equivalent heat capacity varied from 25 to 2950 J/(kg∙°C) as the scale moved from the furnace throat toward the hearth. The calculated reduction in specific coke consumption when loading oily mill scale at a rate of 5 t/day (1.3 kg/t hot metal) was approximately 0.1 kg/t hot metal, while the reduction in blast furnace gas temperature was approximately 0.2 °C.

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