A Kinetic Model of Mass Transfer and Chemical Reactions at a Steel/Slag Interface under Effect of Interfacial Tensions

Ni, Peiyuan; Tanaka, Toshihiro; Suzuki, Masanori; Nakamoto, Masashi; Jönsson, Pär G.

doi:10.2355/isijinternational.isijint-2018-496

Cited by 29 publications

(28 citation statements)

References 19 publications

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“…The microscopic view of the illustration of the dynamic reaction mechanism at the steel-slag interface is shown in Figure 29. [336] The interfacial kinetic model based on a dynamic interfacial tension variation developed by Ni et al can be successfully applied to explain the reoxidation phenomena originating from SiO 2 -rich flux or use of rice husk ash as an insulation powder in a CC tundish, as reported by Kim et al [330,332] and Feichtinger et al [331] The macroscopic view of the schematic diagram for the reoxidation phenomena originating from the slag-metal interfacial reaction in tundish is shown in Figure 30. [330] Because the reoxidation of molten steel generally provides the formation of alumina macroinclusions or clusters, which results in a clogging of SEN during the CC process, [39,[330][331][332][337][338][339][340] the control of the physicochemical properties of the ladle and tundish slag in view of viscosity, refractory corrosion, etc., as well as the simulation of related phenomena, should be further investigated to produce ultrahigh clean steels with less adverse operational problems.…”

Section: Kinetic Model For Inclusion Evolution In CC Tundish By Comentioning

confidence: 95%

“…[41], increases the oxygen content in molten steel, resulting in the formation of Al 2 O 3 inclusions in Al-killed steel. [330][331][332][333][334] Ni et al [335,336] recently developed a novel kinetic model to describe the dynamic slag-steel interfacial phenomena by adopting the slag-steel interfacial tension and interfacial oxygen content. The following steps were considered: (1) the SiO 2 decomposition and O adsorption at the slag-steel interface, (2) the reaction between Al and O, (3) the oxygen desorption at the interface, (4) the Al 2 O 3 dissolution at the interface, (5) the effect of Al 2 O 3 accumulation on SiO 2 mass transfer, and (6) the mass transfer of the elements in steel and slag phases.…”

Section: Kinetic Model For Inclusion Evolution In CC Tundish By Comentioning

confidence: 99%

“…Microscopic view of the mechanism illustrations of the dynamic behavior at the steel-slag interface under the effect of chemical reactions. Reprinted with permission from Ref [336]…”

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confidence: 99%

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Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review

Park

Zhang

2020

Metall Mater Trans B

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The kinetic modeling for the nucleation, size growth, and compositional evolution of nonmetallic inclusions in steel was extensively reviewed in the present article. The nucleation and initial growth of inclusion in molten steel during deoxidation as well as the collision growth, motion, removal, and entrapment of inclusions in the molten steel in continuous casting (CC) tundish and strand were discussed. Moreover, the recent studies on the prediction of inclusion composition in CC semiproducts were introduced. Since the 1990s, the development of thermodynamic model and relevant databases for inclusion engineering has been initiated by the steel industry. Later, the commercial software FACTSAGE employing the FACT database was widely used to predict the gas (atmosphere/bubble)-liquid (steel/slag/inclusion)-solid (refractory/slag/steel/inclusion) multiphase equilibria. With the help of the comprehensive thermodynamic database and solution models in conjunction with the development of user-friendly computing packages, the kinetics of inclusion evolution in molten steel can be successfully predicted based on several kinetic models such as the coupled reaction (CR) model, reaction zone model, and tank series recirculation (TSR) model. However, some parameters are needed to represent the real processes according to the model employed at different operational or experimental conditions. The effect of reoxidation on the evolution of inclusions in the ladle and tundish, which was experimentally confirmed, can be simulated by the effective equilibrium reaction zone (EERZ) model. The complex slag-steel interfacial reaction phenomena have been successfully explained by the interfacial kinetic model based on the dynamic interfacial tension and oxygen adsorption/desorption characteristics at the slag-steel interface.

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Section: Kinetic Model For Inclusion Evolution In CC Tundish By Comentioning

confidence: 95%

Section: Kinetic Model For Inclusion Evolution In CC Tundish By Comentioning

confidence: 99%

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Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review

Park

Zhang

2020

Metall Mater Trans B

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“…According to the above-proposed mechanism, we have developed several mathematical models to quantitatively reproduce the dynamic change in the liquid iron/molten silicate slag interfacial tension. [26][27][28] The present study focuses on the effect of sulfur element on the dynamic change behavior of the liquid iron/molten slag interfacial tension, particularly in the case where sulfur is initially included in the slag but not in the iron. As sulfur is known to be an interface-active element as well as oxygen, it may exceedingly adsorb at the liquid iron/ molten slag interface and contribute to dynamically change the interfacial tension as oxygen does.…”

Section: Effect Of Sulfur In Slag On Dynamic Change Behavior Of Liquimentioning

confidence: 99%

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

et al. 2020

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“…Specifically, the interfacial tension decreases sharply in the beginning, due to intensive mass transfer. Thereafter, the value increases when mass transfer slows down and approaches a stable value when equilibrium is reached . In the present calculation, the interfacial tension values were fixed as 0.5 N m −1 , 1 N m −1 , 1.5 N m −1 , and 2 N m —1 .…”

Section: Resultsmentioning

confidence: 99%

An Experimental and Numerical Study of the Free Surface in an Uphill Teeming Ingot Casting Process

Yin

Guo

Ersson

et al. 2020

steel research int.

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The generation of nonmetallic inclusions due to mold flux entrapment is detrimental for the final steel quality in the uphill teeming process. Herein, physical and mathematical modeling using a full-scale mold is conducted to investigate the change of the hump height and the surface height at the free surface during filling. Moreover, the Weber number is also studied to analyze the tendency of mold flux entrapment at the free surface. The results show that the Reynolds stress model can predict the hump height more accurately compared with the k À ε-based turbulence models. In addition, the result shows that a lower filling rate can result in a lower hump height as well as less fluctuations of the hump and surface heights. Furthermore, the Weber number for the low flow rate case is lower than 12.3, which indicates a small or no risk for mold flux entrapment. The present findings suggest that a reduction in velocity in the mold entrance region are an effective means of reducing the risk of mold flux entrapment.

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A Kinetic Model of Mass Transfer and Chemical Reactions at a Steel/Slag Interface under Effect of Interfacial Tensions

Cited by 29 publications

References 19 publications

Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review

Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review

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

An Experimental and Numerical Study of the Free Surface in an Uphill Teeming Ingot Casting Process

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