National University of Science and Technology MISIS, Moscow, Russia
P. I. Chernousov, Cand. Eng., Aassociate Prof., Dept. of Energy Efficient and Resource Saving Industrial Technologies, e-mail: p.chernou@yandex.ru
O. V. Golubev, Cand. Eng., Aassociate Prof., Dept. of Energy Efficient and Resource Saving Industrial Technologies, e-mail: olega-san@yandex.ru

A. N. Uzunova, Postgraduate Student, Dept. of Energy Efficient and Resource Saving Industrial Technologies, e-mail: miss.chikaleva@gmail.com

Novolipetsk Metallurgical Plant, Lipetsk, Russia
S. V. Myasoedov, Head of the Blast Furnace Shop, e-mail: myasoedov_sv@nlmk.com

A topical area of research in blast furnace smelting is the study of reducing processes. A brief chronology of the development of the theory of the blast furnace process by scientists of the Department of Iron Metallurgy of MISIS (1919–1943, 1962–2006 – “Ore-thermal processes”, then – “Extraction and recycling of ferrous metals” and “Energy-efficient resource-saving industrial technologies”) is given. Using the modern methodology of studying big data, the following were analyzed. performance indicators of NLMK’s blast furnaces Nos. 4, 6 and 7 for 2013–2018, analysis of the obtained results shows a high degree of correlation between the blast moisture content and the degree of development of direct reduction processes both in the case of using only natural gas as a blast additive and in the case of combined use of natural gas and PCI. A seasonal increase/decrease in blast moisture by 1 g/m³ corresponded to a decrease/increase in the degree of development of direct reduction processes rd (according to Pavlov) by 0.5–1.5 % (relative).

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