Piptyuk Vitaly Petrovich, 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; e-mail; piptyuk_vp@i.ua ORCID 0000-0002-2915-1756
Samohvalov Sergey Evgenievich, Dr. Sci., (Engin.), prof., head of dep., Dnieper State Technical University (DSTU, Kamenskoye), ORSID 0000-0002-7362-213Х,
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
Grekov Stanislav Viktorovich, Research Scientist, Iron and Steel Institute named after Z.I. Nekrasovof the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail; GSV4321@i.ua, ORCID 0000-0003-2848-0999
Krasnikov K.S., PhD (Engin.), Senior teacher, Dnieper State Technical University (DSTU, Kamenskoye)ORCID 0000-0002-4241-0572

 

DEVELOPMENT OF TECHNOLOGICAL REGULATION FOR
CARBON IRONING OF IRON IN 30t LADLE. PART 1

Summary. The results of numerical simulation of the carbonization of
low-carbon iron as a by-product of the production of titanium slag for the
designed unit ladle-furnace (LF) installation as applied to the conditions of
PJSC Zaporizhzhya Titanium-Magnesium Combine are presented. The
technological regulations have been developed and a numerical study has been
carried out on the carburization of metal in a 30-ton ladle at the LF. For the
production of commercial pig iron, associated iron-containing waste is used.
The purpose of the work is to identify factors of the influence of out-of-furnace
processing on technology optimization. A numerical simulation was performed
of the carburization technology of liquid low-carbon (up to 2% carbon) cast
iron with lump (fraction up to 50 mm) graphite and coke introduced onto the
surface of a ladle bath (excluding slag cover). The material and energy balances
of the process were carried out, the properties of carburizing materials were
studied, and the diffusion coefficient of carbon in a liquid metal was estimated.
The results of studies of the hydrodynamic and thermal conditions in the bucket
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«Фундаментальные и прикладные проблемы черной металлургии. – 2019. – Вып.33
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bath of the LF are estimated from the contour diagrams of the flow rates and
temperature fields for different flow rates of argon supplied through the bottom
and submerged tuyeres. The optimal fractions of carbon-containing materials
were determined. It has been shown that treatment on LF with lump graphite
requires a shorter duration (≈ 45%) compared with lump coke. To accelerate
the process of diffusion dissolution of carbon, it is necessary to periodically
(every 3 portions of 70 kg of graphite and coke) heat the melt to a temperature
of 1520-1530 ° C. Injection of powdered graphite and coke contributes to a
more efficient absorption of carbon and a decrease in the duration of the
process (≈ by 1/3). Research continues in the direction of using flux-cored wire
for carburizing cast iron at LF.
Keywords: Graphite, coke, carburization of cast iron, ladle furnace
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