Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

Kolesnikov Yu. A., Dr. Eng., Associate Prof., Dept. “Technology of Metallurgy and Foundry Processes”
Bigeev V. A., Dr. Eng., Prof., Dept. “Technology of Metallurgy and Foundry Processes”, e-mail: v.bigeev11@yandex.ru
Sergeev D. S., Post-graduate

NPRO (Scientific-Production Regional Union) “Ural” (Priozersk, Russia)
Dudchuk I. A., Director on Strategic Development and Marketing

The results of calculation of the cooling effects of different burdening materials (scrap, limestone, crude dolomite, etc.) that are used in the basic oxygen converter are presented in this article. This process is realized according to the steel smelting technology which is carried out without intermediate slag descent. Special attention was paid to consideration of a possibility of use of siderite iron ore from Bakalsky deposit in Chelyabinsk region as a complex material of a flux cooling agent for partial replacement of metal scrap, and also – as a slag-forming material. Use of this material provides favourable effect o the output of a liquid semiproduct and rise of lining wear resistance in steel-making furnaces. Quantitative assessment of siderite effect on technological parameters of steel making in the converter in the conditions of the basic oxygen converter shop at Magnitogorsk Iron and Steel Works is carried out. Calculation was conducted on the modernized mathematical model created in Microsoft Excel; this model was based on the system of accounting equations solved jointly by method of iterations. The cooling eff ects of different solid materials of converter melt are obtained and compared, possible expenses of siderite ore with different share of cast iron in metal charge are defi ned, as well as possible change of maintenance of MgO in slag. Analysis of the pilot melts realized in the basic oxygen converter shop at Chelyabinsk Metallurgical Plant has displayed that the total consumption of liquid and solid cast iron exceeded 90 % of the mass of metal charge. At the same time the complete replacement of conventional melt coolers (such as pellets with siderite with consumption during melting made 1.8–4.0% of a melting mass has been got. The equal course of the process, as well as successful slag forming, dephosphorization degree on pilot melts made 89,2% was observed. Relative simplicity and efficiency of this processing method allow to recommend its use for steel melting in converters with the raised cast iron share in furnace charge.

1. Bigeev V. A., Valiakhmetov A. Kh., Yener B., Fedyanin A. N. Experience of steel smelting in superpower arc furnace with increased consumption of solid pig iron. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2014. No. 1(45). pp. 15–18.
2. Grigorovich K. V. Present and future of steel smelting technologies of the XXI century. The V International conference school on chemical technology : collection of thesises of reports of satellite conference of the XX Mendeleev meeting on general and applied chemistry. 2016. pp. 45–47.
3. Leontev L. I., Grigorovich K. V., Kostina M. V. Fundamental investigations as the basis of creation of new materials and technologies in metallurgy. Part 1. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2016. Vol. 59, No. 1. pp. 11–22.
4. Babenko A. A., Smirnov L. A., Mikhaylova L. Yu., Ushakov M. V., Spirin S. A., Sychev A. V. Theoretical and thechnological solutions of increasing of lining resistance in oxygen converters and modern arc furnaces. Chemistry and metallurgy of complex processing of mineral raw materials. Karaganda. 2015. pp. 226–234.
5. Bigeev V. A., Kolesnikov Yu. A., Sergeev D. S. State and prospects of usage of siderite ores of Bakalskoe deposit in ferrous metallurgy. Theory and technology of metallurgical production : inter-regional collection of scientific proceedings. Ed.: V. A. Bigeev. Magnitogorsk : Izdatelstvo Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova, 2013. Iss. 1(13). pp. 4–8.
6. Kolesnikov Yu. A., Bigeev V. A., Sergeev D. S. Calculation of technological parameters of steel smelting in converter using various coolers. Theory and technology of metallurgical production : inter-regional collection of scientific proceedings. Ed.: V. A. Bigeev. Magnitogorsk : Izdatelstvo Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova, 2014. Iss. 2(15). pp. 45–46.
7. Kolokoltsev V. M., Bigeev V. A., Klochkovskiy S. P., Smirnov A. N., Bessmertnykh A. S. Application of methods of pyro- and hydrometallurgy for processing of sideritic ores with the high content of magnesium oxide. Gornyi Zhurnal. 2012. No. S3. pp. 22–24.
8. Savchenko I. A., Smirnov A. N., Turchin M. Yu. Preparation of highmagnesium siderites of the Bakal ore fi eld for metallurgical production by methods of pyro- and hydrometallurgy. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Seriya: Metallurgiya. 2016. Vol. 16, No. 3. pp. 63–69.
9. Yurev B. P., Shatsillo V. V., Melamud S. G. Method for definition of solid fuel consumption on siderite ore annealing in various gaseous mediums. Izvestiya vysshikh uchebnykh zavedeniy. Chernaya metallurgiya. 2008. No. 2. pp. 8–11.
10. Klochkovskii S., Smirnov A. The principles of processing siderite ores with a high magnesium oxide content. Diffusion and Defect Data. Pt A Defect and Diffusion Forum. 2012. Vol. 326–328. pp. 111–114.
11. Yurev B. P., Zhunev A. G. Particularities in sintering of bakalskie siderite ores. Shuiyun Gongcheng. 1998. No. 10. pp. 5–10.
12. Smirnov A. N., Abdrakhmanov R. N., Turchin M. Y. Possibilities of a thermomechanical method for enriching magnesia-bearing raw materials to obtain quality magnesia. Refractories and Industrial Ceramics. 2016. Vol. 57, No. 2. pp. 121–124.
13. Klochkovskii S., Smirnov A., Shabalina U. Thermodynamic and kinetic study of leaching magnesia from natural magnesites by carbon dioxide. Diffusion and Defect Data. Pt A Defect and Diffusion Forum. 2011. Vol. 309–310. pp. 261–264.
14. Baron N. M. Brief reference book of physical and mechanical values. Ed.: A. A. Ravdel and A. M. Ponomareva. Moscow, 2010. Ed. 12. 200 p.
15. Bigeev V. A., Kolesnikov Yu. A., Sergeev D. S. Model of converter steel smelting control. Mathematical application in economic and technical investigations : collection of scientific proceedings. Ed.: V. S. Mkhitaryan. Magnitogorsk : Izdatelstvo FGBOU VO «MGTU», 2016. pp. 283–294.
16. Bigeev A. M., Kolesnikov Yu. A. Basis of mathematical description and calculations of oxygen-converter processes. Moscow : Metallurgiya, 1970. 232 p.
17. Bigeev A. M. Mathematical description and calculations of steelsmelting processes. Moscow : Metallurgiya, 1982. 160 p.
18. Sergeev D. S. , Bigeev V. A. , Kolesnikov Yu. A. , Yachikov I. M. Calculation of parameters of steel smelting in oxygen converter with upper blowing using various coolers. Certificate RF, No. 2015660834. Published: 20.11.2015.
19. Sergeev D. S., Bigeev V. A., Kolesnikov Yu. A., Dudchuk I. A. Method of steel smelting in oxygen converter. Patent RF, No. 2608008. IPC C21C5/28. Published: 11.01.2017. Bulletin No. 2.