DOI: 10.52150/2522-9117-2018-32-165-175

Vergun Alexander Sergeevich, Dr. Sci., (Engin.), Senior Research Scientist, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: ovoch-isi@outlook.com, ORCID 0000-0001- 5493-9214

Shevchenko Anatoliy Pylypovych, Dr. Sci. (Engin.), Professor, Leading Researcher, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; email: ovoch-isi@outlook.com, ORCID 0000-0003-0867-6825

Kislyakov Vladimir Gennadyevich, PhD (Engin.), Senior Researcher, Head of Department, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: ovoch-isi@outlook.com, vovkadragon@yandex.ua, ORCID 0000-0002-1775-5050

Molchanov Lavr Sergeevich, PhD (Engin.), Senior Research Scientist, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; ORSID 0000-0001-6139-5956

Dvoskin Boris Wolfovich, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: ovochisi@outlook.com, ORCID 0000-0003-2891-7833

Complex desulfurization and degassing of hot metal with magnesium

Abstract. The aim of the work is a theoretical and experimental study of the behavior of oxygen, hydrogen and nitrogen in iron during desulfurization with its granulated magnesium. A computational and analytical assessment of the formation and floating of gas bubbles during the introduction of dispersed magnesium into a metal melt in an argon jet is performed. It has been established by calculation that when dispersed magnesium is introduced into the cast iron in an argon jet, through a lance with a nozzle diameter of 7 mm to a depth of 3 m, argon bubbles with a diameter of 25 mm are formed. The thermodynamic probability of the processes of interaction of magnesium with oxygen, nitrogen and hydrogen during desulfurization of cast iron has been established. It has been established that the processes of desulfurization and deoxidation of iron occur throughout the entire range of pressures under study, and the formation of magnesium nitride is possible only with an excess pressure in the gas-metal system at a depth of molten iron more than 1.4 meters. Experiments in industrial conditions revealed the features of the removal of oxygen, nitrogen and hydrogen from cast iron during desulfurization of the melt with dispersed magnesium in a stream of various carrier gases. It was established experimentally that the type of carrier gas has a
decisive influence on the by-pass degassing of the iron during its desulfurization by injecting granular magnesium. When using nitrogen or argon as a carrier gas, the hydrogen content in cast iron is reduced by 50-70%.
Keywords: cast iron, desulfurization, magnesium, gas content in the melt, transporting gas

Reference
1. Morozov A.N. Vodorod i azot v stali. M.: Metallurgiya, 1968. – 280 s.
2. Mikhnevich YU.F., Tret’yakov Ye.V., Yavoyskiy V.I. Azot v kislorodnokonverternoy stali . Stal’. – 1971. – № 1. – S. 18–20.
3. Kolpakov S.V. Tekhnologiya proizvodstva stali v sovremennykh konverternykh tsekhakh. [S.V. Kolpakov, R.V. Starov, V.V. Smoktiy i dr.]. – M.: Mashinostroyeniye. 1991. – 464 s.
4. Bigeyev V.A., Nikolayev A.O., Brusnikova A.V. Osobennosti proizvodstva nizkosernistoy stali s ogranichennym soderzhaniyem vodoroda. Stal’. – № 4. – 2014. – S. 18–20.
5. Shevchenko A.F., Bol’shakov V.I., Bashmakov A.M. Tekhnologiya i oborudovaniye desul’furatsii chuguna magniyem v bol’shegruznykh kovshakh: Monografiya. – Kiyev: «Naukova dumka», 2011. – 220 s.
6. Voronova N.A. Desul’furatsiya chuguna magniyem. M.: Metallurgiya. 1980. – 238 s.
7. Togobitskaya D.N., Moroz V.F., Grin’ko A.YU. Fiziko-khimicheskoye modelirovaniye teplofizicheskikh svoystv zhidkogo chuguna Fundamental’nyye i prikladnyye problemy chernoy metallurgii. – 2005. –
Vypusk 11. – S. 180-184.
8. Kubashevskiy O., Olkokk S.B. Metallurgicheskaya termokhimiya. – M.: Metallurgiya, 1982. – 392 s.