Effect of Sulfur in Slag on Dynamic Change Behavior of Liquid Iron/Molten Slag Interfacial Tension

Suzuki, Masanori; Nakamoto, Masashi; Tanaka, Toshihiro; Tsukaguchi, Yuichi; Mishima, Kentaro; Hanao, Masahito

doi:10.2355/isijinternational.isijint-2020-144

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…Constant interfacial tension for the FeMn system and apparent contact angle for the SiMn system may indicate that the equilibrium in these systems has been reached and further holding does not affect the interfacial interaction. This also accords with previous observations, [30,[34][35][36] where it was concluded that apparent contact angle between metal and slag dynamically changes with holding time, decreasing down to a certain minimum during the absorption of sulfur at the metal-slag interface. Subsequently, apparent contact angle stabilizes after increasing to a certain constant value, when sulfur is desorbed from the interface into the bulk of the molten metal and slag.…”

Section: Effect Of Temperaturesupporting

confidence: 93%

“…Sulfur, as a surface-active element, mainly concentrates at the surface or the interface and therefore the concentration of sulfur in the bulk does not play a significant role on the interfacial mass transfer, which reasonably means that the maximum concentration of sulfur at the interface is reached at S SiMn of 0.25 wt pct and S FeMn of 0.31 wt pct and the further increase of sulfur content in ferroalloys does not affect interfacial interaction in the FeMn-slag-S and SiMn-slag-S systems significantly. Suzuki et al [30] have studied the effect of sulfur in a Fe-slag system on the dynamic change of apparent contact angle, where they found that sulfur absorbs at the Fe-slag interface and the apparent contact angle gradually decreases during reactions between metal and slag which is more pronounced with sulfur addition. Kim and Tangstad [31] studied the reduction kinetics of FeMn and SiMn slags in CO atmosphere at temperatures up to 1873 K. The authors reported that the initial sulfur content in slags changes the rate constant non-linearly, meaning that the rate constant reaches a maximum at a certain sulfur content in slag -0.29 wt pct in their work.…”

Section: Effect Of Sulfur Addition To Ferroalloy-slag Systemsmentioning

confidence: 99%

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Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems

Bublik

Bao

Tangstad

et al. 2021

Metall Mater Trans B

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The present study has investigated the influence of sulfur content in synthetic FeMn and SiMn from 0 to 1.00 wt pct on interfacial properties between these ferroalloys and slags. The effect of experimental parameters such as temperature and holding time was evaluated. Interfacial interaction between ferroalloys and slags was characterized by interfacial tension and apparent contact angle between metal and slag, measured based on the Young–Laplace equation and an inverse modelling approach developed in OpenFOAM. The results show that sulfur has a significant influence on both interfacial tension and apparent contact angle, decreasing both values and promoting the formation of a metal-slag mixture. Despite the fact that sulfur was added only to the ferroalloys, most of sulfur is distributed into slag after reactions with the metal phase. Increasing the maximum experimental temperature in the sessile drop furnace also resulted in a decrease of both interfacial properties, resulting in higher mass transfer rates and intensive reactions between metal and slag. The effect of holding time demonstrated that after reaching equilibrium in FeMn-slag and SiMn-slag systems (both with and without sulfur), interfacial tension and apparent contact angle remain constant.

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Section: Effect Of Temperaturesupporting

confidence: 93%

Section: Effect Of Sulfur Addition To Ferroalloy-slag Systemsmentioning

confidence: 99%

Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems

Bublik

Bao

Tangstad

et al. 2021

Metall Mater Trans B

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“…Sulfur and other surface-active elements have a significant influence on interfacial tension in liquid systems because they can affect the interfacial interaction at the slag-metal interface. [103][104][105] As a result, low interfacial tension leads to the formation of a slag-metal emulsion, metal droplet entrainment during tapping, and therefore poor slag-metal separation. Cramb et al 106 have shown that interfacial tension between steel and slag sharply decreases with an increase of sulfur or oxygen activity.…”

Section: Surface and Interfacial Tensionmentioning

confidence: 99%

Slag Properties in the Primary Production Process of Mn-Ferroalloys

Tangstad

Bublik

Haghdani

et al. 2021

Metall Mater Trans B

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The thermodynamic and kinetic properties of the carbothermic reduction of MnO in the five-component slag, MnO-SiO2-CaO-MgO-Al2O3, is critical in the production process of Mn-ferroalloys. While the reduction rate is mainly dependent on the presence of a solid MnO phase in the slag for Mn-Fe-alloys, the rate for the Mn-Si-Fe alloys has two distinct steps, a slow step followed by a fast step. The extent of the slow step has been shown to be dependent on the S content in the slag. The thermo-physical properties of viscosity, density, interfacial tension and electrical resistivity is reviewed, and these properties are mainly determined by the total basicity.

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“…A large number of academicians have conducted studies on the heat exchange and flow of protective slag. Suzuki et al [8] investigated the influence of sulfur in slag on the dynamic change in the liquid steel/slag interfacial tension; it should be noted that sulfur first existed in the coated slag but not in the molten steel. They calculated the apparent contact angle at the air/slag/steel triple interface using the floating lens method, which was affected by the balances among the surface tension of steel, the surface tension of slag and the interfacial tension between steel and slag in both horizontal and longitudinal directions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow and Fluctuation Characteristics in Coated Slag Using a 2D Model in the Meniscus Region of Mold

Du,

Zeng,

Wang

et al. 2023

Coatings

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Steel is mainly produced through continuous casting; molten steel flows into the mold from the tundish, where it cools and then enters the secondary cooling zone, ultimately solidifying into a billet. During the continuous casting production process, the quality of the casting billet is mainly related to the lubrication state of the coated slag. In the upper part of the mold, the consumption of liquid protective slag directly affects the friction state of the initial solidified billet shell. Therefore, the flow and fluctuation characteristics of coated slag in the meniscus area are very important. There is limited research on the flow and fluctuation characteristics of coated slag in the meniscus area, and little consideration has been given to the shape of the meniscus. In this work, a two-dimensional numerical model for the flow and fluctuation of coated slag in the meniscus region was established, and the transient flow velocity of protective slag and molten steel at each moment of the vibration cycle was obtained, as well as the fluctuation of the slag/steel interface in the meniscus region. The results show that when the surface mold vibrated upwards, the protective slag in the meniscus area flowed clockwise. When the mold moved downwards, the protective slag in the slag pool generated a counterclockwise flow vortex. When the mold was in a positive slip state, the negative pressure formed by the upward flow of the protective slag on the meniscus and the inertia force of steel liquid pushed the meniscus toward the inner wall of the mold. During negative slip, the flow of coated slag generated positive pressure on the slag/steel interface, pushing the meniscus toward the steel liquid, and at the initial moment of negative slip, the steel liquid overflowed into the slag channel. This model could provide a theoretical basis for the flow control of protective slag.

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Effect of Sulfur in Slag on Dynamic Change Behavior of Liquid Iron/Molten Slag Interfacial Tension

Cited by 8 publications

References 27 publications

Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems

Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems

Slag Properties in the Primary Production Process of Mn-Ferroalloys

Analysis of Flow and Fluctuation Characteristics in Coated Slag Using a 2D Model in the Meniscus Region of Mold

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