National University of Science and Technology «MISIS» (Novotroitsk, Russia):

A. N. Shapovalov, Cand. Eng., Associate Prof., Head of the Department of Metallurgical Technologies and Equipment, e-mail: alshapo@misis.ru

National University of Science and Technology «MISIS» (Moscow, Russia):
E. V. Ovchinnikova, Post-Graduate Student, Dept. Energy-Efficient and Resource-Saving Industrial Technologies

«Ural Steel» JSC (Novotroitsk, Russia):
N. A. Maystrenko, Leading Specialist of the Central Laboratory of the Plant

The results of laboratory experiments on the eff ect of magnesia materials of various chemical and mineralogical compositions on the parameters of the sintering process of the Kursk magnetic anomaly ores at JSC «Ural Steel» are presented. The siderite ores of the Bakalsk deposit, as well as magnesia fluxes based on the Khalilovo magnesite, magnesite of the Satka deposit and talc-magnesite ores of the Shabrovsk deposit are used as magnesian components. Use of experimental magnesia materials increases the sinter strength, increases the yield and sinter productivity. The influence of the experimental magnesia materials on the sinter strength is explained by the physical stabilization of the orthosilicate as a result of the formation of a strong ferrite-silicate bond that interferes with the modification of the calcium orthosilicate β → γ. When using the siderites of the Bakalsk deposit as a magnesian component, the mineral formation process is restrained by the reduced activity of MgO, which forms during the decomposition of magnesium carbonate, and also by the formation of spinel phase such as magnomagnetite and magnesioferrite. The rational variant of magnesian component of the sinter mix is magnesite of Khalilovo deposit with 50% magnesite content for JSC «Ural Steel». The replacement of the siderite of the Bakalsk deposit in the production of sinter with 2% MgO on the magnesite of Khalilovo deposit is provides an increase in yield of 4–5%, an increase in sinter strength by 6-10 % and an increase in sinter productivity by 8–10% while keeping the iron content at 53.5%
This work was financially supported by the Ministry of Education and Science of the Russian Federation for the project № 11.2054.2017/4.6 within the framework of the state task for 2017-2019.

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