Stepanenko Dmitry Alexandrovich, PhD (Engin.), Senior Researcher, Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail:d.gorodenskiy@gmail.com, Gorodenskiy@i.ua, ORCID 0000-0002-0184-8295
Yakovitsky Oleksandr Volodimirovich, Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine,49107; ORSID 0000-0002-9540-303
Skachko Alexander Sergeevich, PhD (Engin.), Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academic square Starodubova, 1, Dnipro, Ukraine, 49107
Tsyupa Natalia Oleksandrivna, 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:tysya6669@mail.ru, t.kirill.90@yandex.com
Snigura Iryna Romanivna, Junior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academic square Starodubova, 1, Dnipro, Ukraine, 49107

Experimental studies of the melting points of CaF2, pegmatite, and
mixtures thereof with lime

Summary. Nowadays, one of the pressing issues is the problem of reducing
material and energy costs in the production of certain types of products. Of particular
importance are issues of slag formation due to the development of a ladle furnace (LF)
plant for smelting special and alloyed steel grades with stringent requirements for the
content of harmful impurities. Therefore, the question of choosing the rational
composition of the slag-forming mixture (SFM) requires special attention. The aim of
this work is to carry out research to solve the problems of improving the quality and
competitiveness of manufactured metal products. The paper presents analytical and
experimental studies of the phase composition and melting temperature of the CaF2-CaO
system, which is the basis of the slag-forming mixture for refining steel in a ladle at
domestic metallurgical enterprises. Previous studies on the replacement of fluorspar in
the SFM with mineral raw materials of the domestic field showed that the alternative is
the use of pegmatite from the Eliseevskoye field (Zaporizhzhya region). This contains
alkali metal oxides Na2O and K2O, which affect both the decrease in slag viscosity of
211
«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
metallurgical production and the effect of desulfurization of the metal melt.
Experimental studies of the melting points of fluorspar, pegmatite, and mixtures thereof
with lime have been performed. Also, corundum and periclase-carbon refractory, which
is usually used for lining the slag belt of LF buckets, were used as a substrate on which
the process of melting of the studied materials and their mixtures took place. It is shown
that pegmatite favorably affects the process of lime rarefaction and the formation of slag
melt and can be used as a component of the SFM. The use of pegmatite can completely
or partially replace fluorspar in the composition of the slag mixture with lime.
Keywords: slag-forming mixtures, pegmatite, lime, phase composition, melting
points, slag melt, steel refining, corundum, periclase-carbon refractory, alkali
metal oxides.
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