DOI: 10.52150/2522-9117-2019-33-215-223
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; ORCID 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 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.
References
1. Osnovnie svoystva neorganicheskih ftoridov. Spravochnik. Pod. red. N.P. Galkina. – M: Atomizdat. – 1975. – 400 s.
2. Chuyko N.M., Rutkovskiy V.B. Novaya tehnologiya viplavki sharikopodshipnikovoy stali marki ShH15 pod belim shlakom. Izvestiya visshih uchebnih zavedeniy. Chernaya metallurgiya. – 1960. – №6. – S.14-16.
3. Chuyko N.M., Chuyko A.N. Teoriya i tehnologiya elektroplavki stali. – Kiev:/Donetsk: Golovnoe izdatelstvo. –1983. – 248 s.
4. Phase Diagram Study of the CaO–CaF2 System / Dong-Geun KIM, Corrie van HOEK, Christian LIEBSKE, Sieger van der LAAN, Pierre HUDON and In-Ho JUNG. ISIJ International, Vol. 52 (2012), No. 11, pp. 1945–1950.
5. Patent UA 122873 U, MPK (2017.01), C21C 7/076 (2016.01) Sposib pozapichnoyi obrobki stali v kovshi. [A.I. Panchenko, I.N. Logozinskiy, A.S. Salnikov, A.V. Yakovitskiy, S.L. Kasyan, M.I. Gasik, M.M. Gasik, A.P. Gorobets, Yu.S. Proydak], zayavnik PAT «Elektrometalurgiyniy zavod Dniprocpetssta im. A.M. Kuzmina». – № u2017 09009; zayavl. 11.09.2017; opubl. 25.01.2018, Byul. №2.
6. Kornievskiy V.N. Razrabotka tehnologii vnepechnoy obrabotki elektrostali s primeneniem pegmatita kak zamenitelya plavikovogo shpata. [V.N. Kornievskiy, A.I. Panchenko, I.N. Logozinskiy, A.S. Salnikov, S.L. Kasyan, P.A. Shibeko, S.L. Mazuruk, A.V. Yakovitskiy, M.I. Gasik, A.P. Gorobets]. Sovremennaya elektrometallurgiya. – 2015. – №4. – S. 38-46.
