Estimation Model for Electrical Conductivity of Molten CaF2-Al2O3-CaO Slags Based on Optical Basicity

Birol, Burak; Polat, Gökhan; Sarıdede, Muhlis Nezihi

doi:10.1007/s11837-014-1230-6

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…However, increasing the amount of Al 2 O 3 in the slag leads to further formation of complex ions such as AlF 3À 6 , AlO 2 F 3À 2 , AlO 2 F 3À 2 that in turn further reduces the mobility of F À and consequently the electrical conductivity. These results are in accordance with observations of Mitchell et al [24] and Birol et al [35] on electrical conductivity of CaF 2 -Al 2 O 3 slag. They pointed out that adding a relatively small amount of Al 2 O 3 can drastically decrease the electrical conductivity of slag as a consequence of formation of polyatomic complexes.…”

Section: Resultssupporting

confidence: 93%

A Numerical Investigation on the Electrochemical Behavior of CaO and Al2O3 in the ESR Slags

Karimi-Sibaki

Kharicha

et al. 2020

Metall Mater Trans B

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Field structures including electromagnetic, concentration of ions, and flow fields in an ESR-like process composed of a graphite crucible containing a molten slag, air, and an iron electrode are computed. Both CaF 2-(mass pct 2) CaO and CaF 2-(mass pct 2) Al 2 O 3 slags are examined. Tertiary current distribution is calculated. Therefore, polarization overpotential and Faradic reactions at metal-slag interface are considered using Tafel law, whereas transport of ions in the bulk of slag is determined through Nernst-Planck equations. The main goal is to shed light on the invisible phenomena such as magnetohydrodynamics caused by transport of ions, electrical conductivity of CaF 2-based slag using additives (e.g., CaO or Al 2 O 3), and the role of complexation of ions (e.g., AlO 3À 3) in the molten slag applied to the ESR. An explanation is given for the observation of higher oxygen content in the metal using Al 2 O 3 than that using equivalent amount of CaO in the CaF 2-based slag of a DC-operated ESR.

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Section: Resultssupporting

confidence: 93%

A Numerical Investigation on the Electrochemical Behavior of CaO and Al2O3 in the ESR Slags

Karimi-Sibaki

Kharicha

et al. 2020

Metall Mater Trans B

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“…Because increase in the basicity of mold fluxes provides more alkaline oxides, which are easy to ionize in the molten state, the electrical conductivity of a mold flux also increases . However, the electrical conductivity of the primary crystal nucleus is often different from that of the molten mold flux with a different basicity, which results in a change in the distribution of the current passing through the molten slag, thereby causing the current to have a certain influence on the crystallization behavior of the mold flux.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Crystallinity of Mold Fluxes by Pulsed Electric Current

Huang

Gao

et al. 2019

steel research int.

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Herein, the effect of a pulsed external field on the crystallinity of CaO-SiO 2 -Al 2 O 3 -based mold fluxes with different basicities during continuous cooling is investigated by means of X-ray diffraction and scanning electron microscope analysis. It is well known that an increase in basicity is advantageous for increasing the crystallinity of a mold flux, which relates closely to the horizontal heat transfer and lubrication during casting. However, this rule has changed under electrical pulse processing. In this study, by comparing the crystallinity and crystal phase morphology of the different basicities of mold fluxes after pulsed current treatment, it is found that a pulsed current increases the crystallinity of mold fluxes with low basicity but inhibits the formation of the crystalline phase of mold fluxes with high basicity. It is seen that an electric pulse can play a significant role in regulating the crystallinity of mold fluxes, thus providing a new pathway to solve the contradiction between horizontal heat transfer and lubrication during solidification.

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“…Due to the difficulty of measurements at elevated temperature, a large uncertainty of the properties exists . The following crucial slag properties are required for CFD modeling, which are extracted from literature: electric conductivity, thermal conductivity, viscosity, density, specific heat, surface tension, emissivity, and liquidus/solidus temperature . The physicochemical properties of the conventional slags can vary strongly as function of composition and temperature (Table ).…”

Section: Uncertainties On Physical Properties Of Esr Slagsmentioning

confidence: 99%

Review on Modeling and Simulation of Electroslag Remelting

Kharicha

Karimi-Sibaki

et al. 2017

steel research int.

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The Electroslag Remelting (ESR) is an advanced technology for the production of high quality materials, for example, hot work tool steels or nickel base alloys. In the past years, several models are developed aiming to predict the way in which the operational parameters affect the structure and chemical composition of the final ESR ingot. Proper modeling of this process depends on the ability of the model to predict the Multiphysics resulting from the complex coupling between many physical phenomena. This review includes the main findings starting from the 1970's, with a special focus on the results obtained in the period of 1999-2017. The difficulties related to the poorly known physical properties of ESR slags are discussed. Then, the main achievements in the field of electromagnetism, fluid flow, heat transfer, and solidification are also summarized. The review finishes by presenting the special topics representing the actual scientific frontiers, such as the physics of mold current, the importance of multiphase phenomena, and the difficulties in predicting the electrode melting rate.

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Estimation Model for Electrical Conductivity of Molten CaF2-Al2O3-CaO Slags Based on Optical Basicity

Cited by 16 publications

References 19 publications

A Numerical Investigation on the Electrochemical Behavior of CaO and Al2O3 in the ESR Slags

A Numerical Investigation on the Electrochemical Behavior of CaO and Al2O3 in the ESR Slags

Exploring the Crystallinity of Mold Fluxes by Pulsed Electric Current

Review on Modeling and Simulation of Electroslag Remelting

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