Chernyatevych Anatoliy Hryhorovych, Dr. Sci,, professor, Head of Department, , Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: agchern@ua.fm; ORCID 0000-0002-4552-4997
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
Vakulchuk Vladimir Viktorovich, PhD (Engin.), Research Scientist, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: vvvakulchuk@gmail.com, ORSID 0000-0001-7887-2843
Yushkevich Pavlo Olegovich, Ph.D. (Engin.), Researcher, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail: metallurgistISI@gmail.com, ORSID 0000-0002-2675-0737

Physical and chemical processes in the cavity of the oxygen converter when
burning the bath with the afterburning of exhaust gases

Summary. The aim of the study is to study the characteristics of
physicochemical processes in the cavity of an oxygen converter when purging a
bath through two-tier tuyeres of various designs. The analysis showed that the
classical designs of oxygen tuyeres equipped with tips with Laval nozzles do
not always satisfy the requirements of the technology. The article presents the
results of laboratory high-temperature modeling of the process of purging the
converter bath through two-tier tuyeres equipped with tips of various designs.
The studies were carried out on a multipurpose installation mounted on the
basis of a 150-kg induction furnace and a 60-kg converter manufactured at a
scale of 1:18 relative to 160 tons of an industrial unit. It is shown that the use of
a two-tier lance provides additional advantages for the smelting process. So, in
the initial and main periods of purging the converter bath through a two-tier
lance with a double-row tip, it was possible to accelerate the process of slag
formation without the addition of fluorspar, to intensify the removal of
phosphorus at a high carbon content. Upon completion of the initial purge
period at a low metal temperature of 1300-1330 ° C and the corresponding
116
«Фундаментальні та прикладні проблеми чорної металургії. – 2019. – Вып.33
«Fundamental and applied problems of ferrous metallurgy». – 2019. – Collection 33
ISSN 2522-9117 «Fundamental’nye i prikladnye problemy černoj metallurgii». – 2019. – Vypusk 33
basicity of liquid slag, the degree of dephosphorization of 73.3-79.1% is
achieved. When used for blowing two-tier tuyeres with double-row tips, the
efficiency of afterburning of CO exhaust gases to CO2 also increases at the
same decarburization rate of the bath. Based on the data of high-temperature
modeling, the rational design of the two-tier lance has been determined, which
ensures: balance of the heat balance; yield increase; creating conditions for the
removal of phosphorus at a high carbon content; exclusion of negative effects
on the lining.
Keywords: oxygen converter, high-temperature modeling, two-level
oxygen lance, melting process, exhaust gas afterburning
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