Predictive models for molten slags viscosity and electrical conductivity based on directed chemical bonds concept

Stovpchenko, Ganna; Togobitskaya, D. N.; Lisova, L.O.; Stepanenko, Dmytro; Medovar, L.B.

doi:10.1080/03019233.2022.2026043

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…We used Eq. ( 5) to calculate the activation energy of viscosity E η [15]. It is calculated in a narrow temperature range using the dependence ln (η) = f(T).…”

Section: Evaluation Of the Activation Energy Of Viscositymentioning

confidence: 99%

Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure

Stepanenko¹

2023

physics

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Measurements of metallurgical slag viscosity were performed. The studied slags have been found to have close viscosity (η) values over a wide temperature range from 1453 to 1873 K. The results demonstrate that the viscosity decreases with the increase of CaO/SiO2 ratio. Temperature inflection points (T’) are found in the η = f(T) dependence, and they are consistent with the chemical composition of slags below 1453 K. The value of T’ increases with the increase of CaO/SiO2 ratio. The activation energy of viscosity Eη was calculated by using the Frenkel equation. With the increase of temperature, Eη decreases and does not depend on the chemical composition of slags. In the temperature region from 1473 to 1573 K, the temperature dependence of Eη = f(T) demonstrates energy deviations from the trend line indicating the relaxation of structurally sensitive bonds. The results obtained are of practical importance for the selection of rational slags for different metallurgical processes.

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“…We used Eq. ( 5) to calculate the activation energy of viscosity E η [15]. It is calculated in a narrow temperature range using the dependence ln (η) = f(T).…”

Section: Evaluation Of the Activation Energy Of Viscositymentioning

confidence: 99%

Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure

Stepanenko¹

2023

physics

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“…When selecting the optimal composition for slags, viscosity and electrical conductivity stand out as the most informative properties [1][2][3]. Examination of the fundamental mathematical equations governing the temperature dependency of dynamic viscosity reveals the significant impact of slag structure [4,5].…”

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confidence: 99%

“…The technique suggested for determining activation energies, as outlined references [2,6], relies on utilizing the logarithmic form of equations ( 2) and ( 3):…”

mentioning

confidence: 99%

Оцінка Структури Шлакових Розплавів На Підставі Аналізу Температурних Залежностей В’язкості Та Електропровідності З Використанням Адаптивної Сегментної Регресійної Моделі

Stepanenko,

Togobytska

2024

ITMM

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The expediency of using an adaptive segmented regression model for the analysis of logarithmic dependences of viscosity and electrical conductivity on temperature to assess the structure of slag melts is shown. Calculated values of the activation energies of viscosity ( ) and electrical conductivity ( ) in different temperature ranges. The obtained calculation results confirm that the viscosity and electrical conductivity of slag melts characterize the interaction of various structural particles (ions and/or their groups) and can be used in the study of the structure of slag melts. It was established that the activation energy of viscosity and electrical conductivity decreases as the temperature of slag melts increases. The performed calculations of the indicator n=En/Ex indicate that it can be a criterion for evaluating the structure of the slag melt, when n >1, the slag melt is a heterogeneous system, and when n < 1, it is a homogeneous system. Viscosity and electrical conductivity are interdependent properties and can be predicted if there is data on one of the properties, provided the value of n is known.

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Slag Electrical Conductivity and Its Effect on Mass Transport and Interfacial Reaction Kinetics

Biswas,

Hazaveh,

Coley

2024

steel research int.

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Pyrometallurgical refining typically involves slag–metal reactions which are commonly controlled by transport of reactants in the slag or metal phase. For the simplicity of analysis, mass transport in slag is generally treated on a phenomenological basis as transport of molecules. Although this approach works well for many of the reaction systems over narrow ranges of conditions, it can fail when extrapolated over a wide range of conditions. In many refining processes, transport of oxygen in slag determines the kinetics of major reactions. Transport of oxygen in slag is strongly influenced by the electrical conductivity of slag. Whilst this has been well understood since the 1950s, there have been relatively few attempts to quantify the effects of slag electrical properties on the refining kinetics. Herein, an overview is presented focusing on the electrical properties of slags and their effects on the transport kinetics in steelmaking reactions. An analysis is conducted based on a modified version of the approach taken by Wagner to describe oxygen transport in solid oxides. Data from the literature including work from the authors’ laboratory is discussed in an evaluation of literature oxygen transport in CaO–SiO2–FetO, CaO–SiO2–Al2O3–FetO, and PbO–Fe2O3 slags.

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Predictive models for molten slags viscosity and electrical conductivity based on directed chemical bonds concept

Cited by 8 publications

References 38 publications

Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure

Calculation of activation energy of viscosity for evaluation of metallurgical slag melts structure

Slag Electrical Conductivity and Its Effect on Mass Transport and Interfacial Reaction Kinetics

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