National University of Science and Technology “MISIS”, Novotroitsk Affiliate (Novotroitsk, Russia)

A. N. Shapovalov, Cand. Eng., Associate Prof., alshapo@misis.ru

National University of Science and Technology “MISIS”, Novotroitsk Affiliate (Novotroitsk, Russia)¹ ; Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia)²
S. P. Nefedyev, Dr. Phys.-Math., Prof.^{1, 2}, nsp@oktant-m.ru

National University of Science and Technology “MISIS”, Novotroitsk Affiliate (Novotroitsk, Russia)¹ ; Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia)² ; Kherson Technical University (Genichesk, Russia)³

R. R. Dema, Dr. Eng., Associate Prof.^{1, 2, 3}, demarr78@mail.ru

National University of Science and Technology “MISIS” (Moscow, Russia)
O. R. Latypov, Cand. Eng., Researcher, latolegraf@list.ru

Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia)
R. N. Amirov, Cand. Eng., Associate Prof., ruslan246@mail.ru

The results of laboratorial experiments in the field of examination of the effect of roasting degree, size and method of lime introduction in sintering charge on indicators of a sintering process and sinter quality are presented. It was revealed that increase of active CaO content in lime improves the conditions and the results of pelletizing; it also rises gas penetration ability of sintering charge layer and specific productivity by sinter yield, as well it promotes increase of Fe content and sinter cold strength. It is shown that increase of lime part for concentrate liming with corresponding decrease of lime consumption in an ore stack deteriorates pelletizing results and indicators of sintering process, what is especially visible with reaching lime consumption level 30 kg and more for concentrate preventing. It was determined that lime introduction in an ore stack, with its consumption 45 kg/t and coarseness 0–10 mm, is the most preferable variant for achievement of the optimal parameters for sintering process and sinter quality. The obtained results are mainly explained be varying the mechanism of granules formation for different methods of lime introduction. When introducing lime in concentrate, which is accompanying by nuclei creation with coarseness 1–3 mm, the main development is observed in forming of granules on the base of concentrate, while these granules have smaller strength in comparison with granules on the base of lump ore or recovery. Lime introduction in an ore stack with consequent mixing and pelletizing increases the role of lump ore and recovery in forming of granules, what improves granulometric composition of pelletized charge and strength of granules. Variation of the results of charge pelletizing for different methods of lime introduction, first of all regarding strength of granules, reflects inevitably on parameters of sintering process and sinter strength.

The research was carried out for the account of the Russian Scientific Fund grant (Agreement No. 23-79-30015, https://rscf.ru/project/23-79-30015). The part of this research was conducted under financial support of the National University of Science and Technology”MISIS” within the framework of the program “Priority 2030” realization.

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DOI: 10.1088/1757-899X/625/1/012009