Donbass State Technical University (Alchevsk, Russia)
S. V. Kuberskiy, Cand. Eng., Prof., professorkuberskiy@gmail.com
This article focuses on the development of the theory and technology for the deep arc recovery (DAR) of elements from technogenic waste, intended for the refining, deoxidation, and alloying of iron-carbon melts. A key technological requirement for the DAR process is the synchronous consumption of the ore-reducing mixture (ORM) and the composite iron-graphite electrode (CGE), which together constitute the ore-reducing unit (ORU). To predict the consumption rate of the CGE when using an ORM based on various types of technogenic waste, a four-factor regression model has been developed and verified. This model accounts for the influence of several parameters: the minimum and effective ionization potentials of the gas phase, the thermal conductivity of the oxide additive within the electrode mixture (EM), and the gas evolution resulting from the carbothermic reduction of its oxide components. Using this regression model, projections for the compositions of the ORM and EM were prepared for the utilization of ash from thermal power plants via the DAR method; these data are essential for developing an effective technology for the ladle treatment of steel using such materials.
1. Panfilov M. I. et al. Slag processing and zero-waste technology in metallurgy. Moscow: Metallurgiya, 1987. 238 p.
2. Petrushov S. N. et al. Prospects for the development of technogenic deposits: A case study of processing steelmaking slags at the Alchevsk Metallurgical Combine. Metallurgicheskaya i gornorudnaya promyshlennost. 2002. No. 4. pp. 123–125.
3. Smirnov A. N., Zborshchik A. M. Out-of-furnace refining of iron and steel: A study guide. Donetsk: GVUZ «DonNTU», 2012. 186 p.
4. Valuev D. V. Out-of-furnace and ladle steel treatment processes in metallurgy: A study guide. 2nd revised edition. Tomsk: TPU, 2009. 206 p.
5. Smirnov A. N. et al. Electric-arc and electromagnetic treatment of melts: Monograph. Alchevsk: DonSTU, 2013. 320 p.
6. Nizyaev K. G., Boychenko B. M. Desulfurization of iron and steel using magnesium reduced within the zone of an electric arc submerged in the metal. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. 2007. No. 11. pp. 34–39.
7. Semiryagin S. V. Development of a technology for the desulfurization of molten iron via the aluminothermic reduction of magnesite deep within the molten metal: Dissertation … of Candidate of Engineering Sciences: 05.16.02. DonSTU. Alchevsk, 2005. 200 p.
8. Protsenko M. Yu. Development of a resource-saving technology for the arc deep recovery of manganese from silicomanganese slag into iron-carbon melts via an electric-arc process: Dissertation … of Candidate of Engineering Sciences: 05.16.02. DonSTU. Lisichansk, 2016. 191 p.
9. Bigeev V. A. et al. Specifics of electric arc furnace operation with long arcs. Vestnik MGTU imeni G. I. Nosova. 2006. No. 4. pp. 20–23.
10. Porrachin P., Onesti D., Grosso A., Miani F. The role of slag foaming in optimizing the thermal performance of AC electric arc furnaces. Stal. 2005. No. 4. pp. 84–86.
11. Makarov A. N., Kuznetsov A. V. Investigation of the influence of slag layer thickness and electromagnetic blowing on arc efficiency in electric arc steelmaking furnaces. ESiK. 2016. No. 2 (31). pp. 27–29.
12. Makarov A. N. Influence of slag layer height on arc efficiency and electrical energy consumption in electric arc steelmaking furnaces. Vestnik Tverskogo gosudarstvennogo tekhnicheskogo universiteta. Seriya "Stroitelstvo. Elektrotekhnika i khimicheskie tekhnologii". 2020. No. 4 (8). pp. 66– 72.
13. Gorlanov E. S., Sizyakov V. M., Sharikov F. Yu. et al. Challenges and solutions regarding the protection of carbon-graphite electrodes. iPolytech Journal. 2024. Vol. 28. No. 3. pp. 513–537. DOI: 10.21285/1814-3520-2024-3-513-537
14. Feshchenko R. Yu., Erokhina O. O., Litavrin I. O., Ryaboshuk S. V. Improvement of oxidation resistance of arc furnace graphite electrodes. Chernye Metally. 2023. No. 7. pp. 31–36.
15. Yachikov I. M., Portnova I. V., Bystrov M. V. Analysis of the effectiveness of using forced cooling for graphite electrodes to reduce their consumption in electric arc furnaces. Matematicheskoe i programmnoe obespechenie system v promyshlennoy i sotsialnoy sferakh. 2019. Vol. 7. No. 1. pp. 24–29.
16. Alavi B., Aghajani H., Ehtesabi H. et al. A dual-layer ceramic coating based on silicon carbide and boron oxide on the graphite surface to establish high temperature oxidation resistance. J. Aust. Ceram. Soc. 2024. 60. pp. 1153–1165. DOI: 10.1007/s41779-024-01019-5
17. Alian Moghadam H., Jabbari M., Daneshmand S. et al: Effects of TiO2/SiC/SiO2 coating on graphite electrode consumption in sublimation and oxidation states as determined by EAF simulation and experimental methods. Surface and Coatings Technology. 2021. 420. 127340. DOI: 10.1016/j.surfcoat.2021.127340
18. Bystrov M. V. Practical recommendations for the design of an evaporative cooling system for graphite electrodes in electric arc furnaces. Teoriya i tekhnologiya metallurgicheskogo proizvodstva. 2024. No.2 (49). pp. 16–26.
19. Dai H., Dai D., Zhang Z. et al. Dynamic behavior of a graphite electrode under thermal shock from a pulsed arc. Proceedings of the 4th International Symposium on Plasma and Energy Conversion. ISPEC 2022. Springer Proceedings in Physics. Vol. 391. Springer, Singapore. DOI: 10.1007/978-981-99-1576-7_6
20. Apalkova G. D. Destruction of graphitized electrodes under thermal shock conditions. Novye ogneupory. 2018. No. 3. pp. 57–63.
21. Zeng H., Lin F., Cai L. et al. Study on erosion mechanism of graphite electrode in two-electrode spark gap switch. Rev. Sci. Instrum. 2012.83 DOI: 10.1063/1.3677325
22. Krutiansky M. M., Nekhamin S. M., Mitrofanov M. V. Electrical operating modes of direct and alternating current arc furnaces for foundry production. Elektrometallurgiya. 2018. No. 2. pp. 8–16.
23. Kukharev A. L. Modeling of an electric arc based on magnetohydrodynamic equations. Transactions of the Donbass State Technical Institute. 2023. No. 30 (73). pp. 37–46.
24. Grudnitsky O. M., Iskhakov R. A.-R., Korobov V. K. Ways to reduce the specific consumption of graphite electrodes in electric arc steelmaking furnaces. Lityo i metallurgiya. 2011. No. 1 (59). pp. 100–101.
25. Fedulova M. A. Physicochemical processes in the welding arc: Study guide. Yekaterinburg: Izdatelstvo GOU VPO "Rossiysky gosudarstvenny professionalno-pedagogicheskiy universitet", 2009. 79 p.
26. Kubersky S. V. Improvement of parameters for the deep arc-based recovery of valuable elements during the out-of-furnace processing of iron-carbon melts. Stal. 2023. No. 10. pp. 20–26.