National Research University “Moscow Power Engineering Institute” — Smolensk Branch, Smolensk, Russia:

M. I. Dli, Dr. Eng., Prof., e-mail: midli@mail.ru
V. I. Bobkov, Dr. Eng., Associate Prof., e-mail: vovabobkoff@mail.ru
A. M. Sokolov, Leading Engineer, e-mail: ansokol98@mail.ru

Plekhanov Russian University of Economics, Moscow, Russia:

N. S. Kulyasov, Cand. Econ., Leading Researcher of the Higher School of Tariff Regulation, e-mail: nkulyasov@gmail.com

The work is devoted to research of chemical-metallurgical decarbonization process in iron ore pellets, taking into account thermal and technological operation features of roasting conveyor-type machines. Calcination of pelletized iron ore raw material was experimentally examined, using the samples that save their initial structure within the temperature and heating rate ranges of the existing roasting conveyor-type machines. Appearance of essential temperature gradients in the examined samples was proved experimentally; it was connected with non-stationary heating conditions and thermal effects of carbonates dissociation reaction. These conditions and effects restrict possibility of use of the existing non-isothermal kinetic methods for determination of kind and parameters of kinetic equations. The relationship among heterogeneous endothermic transformations and thermal physical calcination conditions was revealed.

The research was conducted under financial support of the Russian Foundation for Basic Research (RFFI) within the scientific project No. 18-29-24094 MK and the Government Order, the project No. FSWF-2020-0019.

1. 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.
2. Guro V. P., Yusupov F. M., Safarov E. T., Rakhmatkarieva F. G. Thde choice of optimal binder for molybdenate concentrate granulation. Tsvetnye metally. 2016. No. 2. pp. 68–73.
3. Nayak D., Ray N., Dash N., Pati S., De P. S. Induration aspects of low-grade ilmenite pellets: Optimization of oxidation parameters and characterization for direct reduction application. Powder Technology. 2021. Vol. 380. pp. 408–420.
4. Meshalkin V. P., Bobkov V. I., Dli M. I., Fedulov A. S. Mathematical simulation of chemical and energotechnological processes and procedures of coke fines burning in agglomerated layer. CIS Iron and Steel Review. 2020. Vol. 19. pp. 13–17.
5. Wang S., Guo Y., Zheng F., Chen F., Yang L. Improvement of roasting and metallurgical properties of fluorine-bearing iron concentrate pellets. Powder Technology. 2020. Vol. 376. pp. 126–135.
6. Bokovikov B. A., Bragin V. V., Shvydkii V. S. Role of the thermalinertia zone in conveyer roasting machines. Steel in Translation. 2014. Vol. 44. No. 8. pp. 595–601.
7. Li J., An H.-F., Liu W.-X., Yang A.-M., Chu M.-S. Effect of basicity on metallurgical properties of magnesium fluxed pellets. Journal of Iron and Steel Research International. 2020. Vol. 27. No. 3. pp. 239–247.
8. Tian H., Pan J., Zhu D., Wang D., Xue Y. Utilization of Ground Sinter Feed for Oxidized Pellet Production and Its Effect on Pellet Consolidation and Metallurgical Properties. Minerals, Metals and Materials Series. 11^th International Symposium on High-Temperature Metallurgical Processing. 2020. pp. 857–866.
9. Matkarimov S. T., Berdiyarov B. T., Yusupkhodjayev A. A. Technological parameters of the process of producing metallized iron concentrates from poor raw material. International Journal of Innovative Technology and Exploring Engineering. 2019. Vol. 8. No. 11. pp. 600–603.

10. Bragin V. V., Bokovikov B. A., Naidich M. I., Gruzdev A. I., Shvydkii V. S. Relation between the productivity and fuel consumption in roasting machines. Steel in Translation. 2014. Vol. 44. No. 8. pp. 590–594.
11. Akberdin A. A., Kim A. S., Sultangaziev R. B. Experiment Planning in the Simulation of Industrial Processes. Steel in Translation. 2018. Vol. 48. No. 9. pp. 573–577.
12. Shvydkii V. S., Fatkhutdinov A. R., Devyatykh E. A., Devyatykh T. O., Spirin N. A. On mathematical modeling of layer metallurgical furnaces and aggregates. Report 2. Izvestiya vuzov. Chernaya metallurgiya. 2017. Vol. 60. No. 1. pp. 19–23.
13. Yuryev B. P., Goltsev V. A. Change of equivalent layer porosity of pellets along the length of burning conveyor machine. Izvestiya vuzov. Chernaya metallurgiya. 2017. Vol. 60. No. 2. pp. 116–123.
14. Shvydkii V. S., Yaroshenko Y. G., Spirin N. A., Lavrov V. V. Modeling of metalized pellets firing with the account of physicochemical transformations in them. Izvestiya vuzov. Chernaya metallurgiya. 2018. Vol. 61. No. 4. pp. 288–293.
15. Novichikhin A. V., Shorokhova A. V. Procedures for stage processing of iron-ore wastes in industrial mining areas. Izvestiya vuzov. Chernaya metallurgiya. 2017. Vol. 60. No. 7. pp. 565–572.
16. Bobkov V. I., Borisov V. V, Dli M. I., Meshalkin V. P. Multicriterial optimization of the energy efficiency of the thermal preparation of raw materials. Theoretical Foundations of Chemical Engineering. 2015. Vol. 49. No. 6. рр. 842-846.
17. Bobkov V. I., Borisov V. V., Dli M. I., Meshalkin V. P. Intensive Technologies for Drying a Lump Material in a Dense Bed. Theoretical Foundations of Chemical Engineering. 2017. Vol. 51. No. 1. рр. 70–75.
18. Tian Y., Qin G., Zhang Y., Zhao L., Yang T. Experimental research on pellet production with boron-containing concentrate, Chara-cterization of Minerals, Metals, and Materials. Minerals, Metals and Materials Series. 2020. pp. 91–102. DOI: 10.1007/978-3-030-36628-5_9.
19. Yaroshenko Y. G. Thermal physics as the basis for energy and resource conservation in steelmaking. Steel in Translation. 2017. Vol. 47. No. 8. pp. 505–516.
20. Yang C.-C., Zhu D.-Q., Pan, J., Zhou B.-Z., Xun H. Oxidation and Induration Characteristics of Pellets Made from Western Australian Ultrafine Magnetite Concentrates and Its Utilization Strategy. Journal of Iron and Steel Research International. 2017. Vol. 23. No. 9. pp. 924–932.
21. Zhuravlev F. M., Lyalyuk V. P., Tarakanov A. K., Chuprinov E. V., Kassim D. A. Metallurgical characteristics of unfluxed pellets produced from concentrates with different mineral content. Steel in Translation. 2016. Vol. 46. No. 6. pp. 419–427.
22. Wang L., Liu W., Hu J., Xie H., Li C. Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO₂ and Al₂O₃. Chinese Journal of Chemical Engineering. 2018. Vol. 26. No. 3. pp. 583–592.