Smolensk Branch of the National Research University “Moscow Power Engineering Institute” (Smolensk, Russia)

M. I. Dli, Dr. Eng., Prof., Head of the Dept. of Information Technologies in Economics and Management, e-mail: midli@mail.ru
V. I. Bobkov, Dr. Eng., Prof., Head of the Dept. of Higher Mathematics, e-mail: vovabobkoff@mail.ru
A. A. Bykov, Cand. Ped., Associate Prof., Head of the Dept. of Physics, e-mail: alex1by@mail.ru

This research presents the experimental results of the dual-stage technological route for removal of sulphuric impurities from refractory iron-bearing ore. Such ore contains various fractions and is subjected to processing in the conditions of solid phase and liquid phase sintering, via standard temperature procedures and with active use of catalytic impurities having different chemical composition. The study was carried out using high-temperature derivatography, which allows to analyze dependence between dissociation speed of minerals and temperature. The developed procedure for kinetic measurements of dissociation of sulphates opens new possibilities for examination of the thermal properties during chemical and metallurgical processes, within the wide range of iron-bearing ores. The results of dependence between desulphurization of iron-bearing ore and the size of ore fraction as well as addition of catalytic impurities are obtained. It was established that presence of pre pieces with size larger than 5-6 mm in charge, which are hardly absorbed by a sintering melt, leads both to decrease of sinter mechganical strength and to increase of sulphur content in this sinter. Additionally, it was revealed that removal of impurities from usual and refractory ore, in its small and large fractions, occurs at different temperature procudures. Essential difference in the decomposition mechanism for sulphates at the temperatures of solid phase and liquid phase sintering were found out. Usual (not refratory) ore needs high oxidation degree of a slag phase to provide liquid phase sulhur removal from large fractions, while replacement of an air atmosphere by neutral medium leads to decrease of decomposition temperature of sulphates. It was established for refractory ore that fluxing during low-temperature sintering has a negative effect on desulphurization, while during high-temperature sintering this effect is positive. Thus, analysis of the experimental data copnfirms necessity of using the dual-stage technological route in desulphurization nof ironbearing ore, in order to obtain high-quality sinter.

The research was carried out within the framework of the State Assignment, the project No. FSWF-2023-0012.

1. Hannemann F., Bradfield M., Mahdi M., So L. L. C., Metcalfe D. Impact of air granulation on the ferrochrome value chain in metallurgical smelter complexes. Journal of the Southern African Institute of Mining and Metallurgy. 2018. Vol. 118. No. 6. pp. 625–630.
2. Leontyev L. I., Grigorovich K. V., Kostina M. V. Fundamental investigations as a base for development of mew materials and technologies in the field of metallurgy. Part 1. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2018. Vol. 61. No. 1. pp. 11–22.

3. Kuskov V. B., Lvov V. V., Yushina T. I. Increasing the recovery ratio of iron ores in the course of preparation and processing. CIS Iron and Steel Review. 2021. Vol. 21. pp. 4–8.
4. Bakalskoe ore administration. Sideritovaya mine. https://uralmines.ru/bakalskoe-rudoupravlenie-shahta-sideritovaya (Access date: 04.08.2025).
5. Frolov Yu. A., Chukin D. M., Polinov A. A. et al. Improvement of charge loading operations in the sintering machines at Magnitogorsk Iron and Steel Works. Part 1. Stabilization of charge flow during loading of the sintering machines. Metallurg. 2021. No. 10. pp. 11–18. DOI: 10.52351/00260827_2021_10_11
6. Dli M. I., Puchkov A. Yu., Prokimnov N. N., Okunev B. V. Fuzzy logic model for the multi-stage chemical and electrotechnological processing system for fine-dispersed ore raw materials. Prikladnaya informatika. 2023. Vol. 18. No. 3. pp. 92–104. DOI: 10.37791/2687-0649-2023-18-3-92-104
7. Zainullin L. A., Karelin V. G., Epishin A. Yu., Artov D. A. Omprovement of the pyro- and hydrometallurgical technology for dephosphorization of brown iron ore at Lisakovskoe deposit via hot leaching technique. Metallurg. 2020. No. 6. pp. 32–35.
8. Zhu X., Ji Y. A digital twin–driven method for online quality control in process industry. International Journal of Advanced Manufacturing Technology. 2022. Vol. 119 (5–6). pp. 3045–3064.
9. Yuryev B. P., Dudko V. A. Study of desulphurization process during heat treatment of iron ore pellets. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. 2018. No. 11 (1427). pp. 21–29.
10. Wang S., Guo Y., Zheng F., Chen F., Yang L. Improvement of roasting and metallurgical properties of f luorine-bearing iron concentrate pellets. Powder Technology. 2020. 376, pp. 126–135.
11. Puchkov A. Yu., Lobaneva E. I., Kultygin O. P. Predicting algorithm for parameters of the system for processing of wastes of apatite-nepheline ores. Prikladnaya informatika. 2022. Vol. 17. No. 1 (97). pp. 55–68.
12. Bobkov V. I., Dli M. I., Sokolov A. M., Rubin Y. B. Analysis of chemical-metallurgical agglomeration processes during charge sintering. CIS Iron and Steel Review. 2020. Vol. 20. pp. 7–11.
13. Kazakov A. A., Murysev V. A., Kiselev D. V. Interpretation of nature of non-metallic inclusions in assessing the quality of metal products in the industrial conditions. Chernye metally. 2021. No. 9. pp. 47–54.
14. Cooksey M., Guiraud A., Kuan B., Pan Y. Design and Operation of Dry Slag Granulation Pilot Plant. Journal of Sustainable Metallurgy. 2019. Vol. 5. No. 2. pp. 181–194.
15. Tomtas P., Skwiot A., Sobiecka E., Obraniak A, Ł awińska K., Olejnik T. P. Bench Tests and CFD Simulations of Liquid–Gas Phase Separation Modeling with Simultaneous Liquid Transport and Mechanical Foam Destruction. Energies. 2021. Vol. 14 (6). p. 1740. DOI: 10.3390/en14061740