Development Of Technology Of Ladle Treatment Of Electric Steel By Using Pegmatite As Substitute For Fluorspar

Kornievsky, V.N.; Панченко, А И; Logozinsky, I.N.; Сальников, А С; Kasian, S.L.; Shibeko, P.A.; Mazuruk, S.L.; Yakovitsky, A.V.; Gasik, M.I.; Gorobets, A.P.

doi:10.15407/sem2015.04.06

Sovrem. elektrometall.

2015

DOI: 10.15407/sem2015.04.06

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Development Of Technology Of Ladle Treatment Of Electric Steel By Using Pegmatite As Substitute For Fluorspar

V.N. Kornievsky¹,

А И Панченко²,

I.N. Logozinsky³

et al.

Abstract: «…Основная и решающая часть научного знанияфакты и их крупные и мелкие эмпирические обобщения. Научные теории и гипотезы не входят, несмотря на их значение в текущей работе, в основную и решающую часть научного знания. Основное значение гипотез и теории-кажущееся».

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Thermodynamic modeling of interphase distribution of chromium and boron in slags of AOD reduction period

Babenko,

Zhuchkov,

Kel’

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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The paper presents the results of a thermodynamic modeling of the chromium and boron reduction from slags of reduction period of argon-oxygen decarburization (AOD) by a complex reducing agent containing silicon and aluminum. Using the simplex lattice method, an experiment planning matrix is constructed containing 16 compositions of the oxide system СаО – SiO2 – (3 – 6 %) В2О3 – 12 % Cr2O3 – 3 % Al2O3 – 8 % MgO of variable basicity 1.0 – 2.5. The results of thermodynamic modeling are graphically presented in form of dependence of equilibrium distribution of chromium and boron on the slag composition at temperatures of 1600 and 1700 °C. The constructed diagrams make it possible to quantify the influence of the temperature, basicity and B2O3 in the slag on equilibrium interphase distribution of chromium and boron. It is established that increasing the slag basicity from 1.0 to 2.5 improves the process of chromium reduction, but restores the boron stability. With an increase in B2O3 content in the slag, a slight deterioration of chromium reduction process occurs, while the boron content in the metal increases. With a simultaneous increase in basicity up to 2.5 and a decrease in boron oxide in the slag from 5 to 3 %, the interphase distribution coefficient of chromium is reduced to 1.5·10–3. Changing the process temperature from 1600 to 1700 °C does not have a negative effect on the process of chromium reduction, but worsens the boron reduction conditions. Based on analysis of the formed slag phases and thermodynamics of the reactions of their formation, it is established that chromium is mainly reduced by aliminum with only partial development of silicothermy. The residual silicon content reduces boron, thereby limiting its concentration in the metal. The results of high-temperature experiments showed high correspondence with the results of thermodynamic studies.

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Thermodynamic modeling of interphase distribution of chromium and boron in slags of AOD reduction period

Babenko,

Zhuchkov,

Kel’

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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

Stepanenko¹,

Skachko²,

Tsyupa³

et al. 2019

Fund.Appl.Probl.F.Met

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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.

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Development Of Technology Of Ladle Treatment Of Electric Steel By Using Pegmatite As Substitute For Fluorspar

Cited by 2 publications

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Thermodynamic modeling of interphase distribution of chromium and boron in slags of AOD reduction period

Thermodynamic modeling of interphase distribution of chromium and boron in slags of AOD reduction period

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

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