DOI: 10.52150/2522-9117-2023-37-175-183

Dvoskin Borys Vulfovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0003-2891-7833. E-mail: ovoch-isi@outlook.com

Manachyn Ivan Oleksandrovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0001-9795-6751. E-mail: ovoch-isi@outlook.com

Kislyakov Volodymyr Hennadiiovych, Ph. D. (Tech.), Senior Researcher, Head of Department, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-1775-5050. E-mail: ovoch-isi@outlook.com

Shevchenko Serhiy Anatoliyovych, Ph. D. (Tech.), Senior Researcher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0003-1521-9665. E-mail: ovoch-isi@outlook.com

Petrusha Victoria Petrivna, Junior Resreacher, Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine. ORCID: 0000-0002-1031-3241. E-mail: ovoch-isi@outlook.com

Zotov Dmytro Serhiiovych, Director of Technology and Quality, Ph. D. (Tech.), Metinvest Holding LLC,Laboratory Lane, 12, Kyiv, 03150, Ukraine. E-mail: dmitriy.zotov@metinvestholding.com

PECULIARITIES OF CHANGES IN SULPHUR CONTENT IN BLAST FURNACE CAST IRON SUPPLIED FOR BOF PROCESSING

Abstract. The aim of the work is to increase the efficiency and stability of the desulphurization process by blocking the resulfurization of pig iron in the process of technological operations for the preparation of blast furnace pig iron for converter processing at Azovstal Iron and Steel Works. Technological control of each of the technological operations on the route “blast furnace – desulphurization – slag pumping – mixer department” was performed, with sampling of pig iron, slag and chemical composition control to establish the actual sulfur content transferred from slag to pig iron in the process of pig iron release from the blast furnace to the iron ladles. The research carried out at Azovstal Iron and Steel Works in the process of iron discharge from blast furnaces and pouring into ladles includes 20 discharges or 53 ladles. The results obtained during the process control confirmed the previously established regularities that technological operations with desulphurized pig iron before it is poured into converters are not accompanied by pig iron resulfurization. It was found that the sulfur content in the mixers after the controlled portions of desulphurized pig iron were poured out, with almost no deviations (within the error of the rapid analysis), corresponded to the calculated values determined taking into account the mass of pig iron in the mixer and the sulfur content in it before overflow. Recommendations for corrections to the initial sulfur content for blast furnaces have been developed, which will increase the stability of the results achieved during the desulfurization of cast iron in the cast iron desulfurization department when setting the required consumption of magnesium reagent. The obtained results of the studies have shown that in order to increase the efficiency of technological and technical solutions for sulfur control, it is advisable to rationalize ladle slag regimes, including by adjusting the composition of ladle slag and thoroughly cleaning cast iron from high-sulfur slag.

Key words: desulphurization, cast iron, re-sulphurization, ladle, slag, mixer.

DOI: https://doi.org/10.52150/2522-9117-2023-37-175-183

For citation: Dvoskin, B. V, Manachin, I. O., Kislyakov, V. H., Shevchenko, S. A., Petrusha, V. P., & Zotov, D. S. (2023). Peculiarities of changes in sulphur content in blast furnace cast iron supplied for BOF processing. Fundamental and applied problems of ferrous metallurgy, 37, 175-183. https://doi.org/10.52150/2522-9117-2023-37-175-183

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