Electrochemical characteristics of molten iron electrodes in slag and electrochemical properties of their interface

Judge, W.D.; Paeng, J.; Azimi, Gisele

doi:10.1016/j.electacta.2021.138755

Cited by 12 publications

(3 citation statements)

References 35 publications

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“…The application of external electric field between slag and steel also could enhance the deoxidation rate of molten steel [14][15][16]. The efficiency for deoxidization and the final oxygen content of molten steel as a function of the external voltage is shown in Fig 4 . The initial total oxygen content of molten steel is about 100ppm, which includes soluble oxygen and inclusions.…”

Section: Resultsmentioning

confidence: 99%

Desulfurization of molten steel with molten slag using the electrochemical method

et al. 2022

J min metall B Metall

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The desulfurization in metallurgical process is electrochemical reaction in nature. Desulfurization using the electrochemical method was proposed with the CaO-MgO-Al2O3 molten slag covering molten steel. Effect of an applied external DC voltage, varied from 0 to 8V, was discussed. The results indicated that sulfur in molten steel can be removed effectively with applied external voltage. According to the mechanism analyses of the desulfurization under the applied external voltage, kinetics formulae were developed, and the model calculated results accord well with the experimental values. The transfer coefficient of sulfur in molten slag under electromigration conditions is approximately 2.09?10-5 m?s-1?V-1. The desulfurization of molten steel with molten slag can be promoted by increasing the applied voltage, reducing the partial pressure of atmospheric oxygen, strengthening the stirring intensity of the reaction system, and optimizing the composition and properties of the slag.

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Section: Resultsmentioning

confidence: 99%

Desulfurization of molten steel with molten slag using the electrochemical method

et al. 2022

J min metall B Metall

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“…In a first step, the impedance is recorded as a function of the frequency via a frequency sweep for which the results can be visualised in a Nyquist plot as shown on the left side of Figure 1. This Nyquist plot can be divided into two regions: a high frequency region corresponding to an inductive tail and a low frequency region corresponding to a semiarc [20][21][22][23][24][25] . The high frequency tail is the result of the solution resistance and the induction due to the long wires needed to connect the electrodes/melt with the measurement device 20,21,23 , while the low frequency semi-arc is the result of the solution-electrode interface 6,24 .…”

Section: Measurement Proceduresmentioning

confidence: 99%

“…In a second step, the solution resistance Rsolution should be determined which can be done via several methods. A first method is to fit an equivalent circuit to the recorded impedance spectrum 20,21,23,24,[26][27][28] similar to the circuit as visualised in Figure 1. This technique is more commonly known as Electrochemical Impedance Spectroscopy (EIS).…”

Section: Measurement Proceduresmentioning

confidence: 99%

Parameter investigation of the experimental methodology of electrical conductivity measurements for PbO containing slags

Boeykens

Bellemans

Scheunis

et al. 2023

Electrochimica Acta

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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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Electrochemical characteristics of molten iron electrodes in slag and electrochemical properties of their interface

Cited by 12 publications

References 35 publications

Desulfurization of molten steel with molten slag using the electrochemical method

Desulfurization of molten steel with molten slag using the electrochemical method

Parameter investigation of the experimental methodology of electrical conductivity measurements for PbO containing slags

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

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