Electrochemical study on molten iron-carbon electrodes in slag and their decarburization by slag/metal reaction

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

doi:10.1016/j.electacta.2021.139801

Cited by 13 publications

(3 citation statements)

References 39 publications

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“…The complexes in slag typically included (SiO 4 4-), (Si 2 O 7 6-), (AlO 5 4− ), (AlO 7 5− ), and other metalloidoxygen complexes 28,29) . Carbon also substituted Si or Al of these complexes and formed carbonaceous species that allowed carbon to diffuse through slag and precipitate at the interface with iron 30) . These results further verified the presence of elements such as C, O, Ca, and Si at the slagiron interface in Fig.…”

Section: Carbon Dissolution Mechanismsmentioning

confidence: 99%

Dissolution of Carbon-Containing Species in CaO–SiO2–Al2O3 Slag

Li,

Liang,

Han

2024

ISIJ Int.

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The acceleration of the carburizing and melting processes in reduced iron is critical for reducing energy consumption and CO 2 emissions produced by the steel industry. The aims of the study were to clarify the carbon dissolution reactions and diffusion processes in molten slag. A combined approach utilizing Raman spectroscopy and XPS was employed to investigate the relationship between carbon-containing species and slag composition in the CaO-SiO 2 -Al 2 O 3 slag system. The Raman spectra indicated that carbon dissolved in slag in the form of carbides, carbonates, and graphitic structures. The proportion of carbide ions in the slag increased from 64.2% to 74.7%, and the proportion of graphitic structures decreased from 19.7% to 7.4% as the slag's basicity increased.The carbon dissolution mechanism in slag involved the reaction of carbon with dissolved oxide ions and oxygen-containing anions in the slag. This formed carbon-containing species such as CO 3 2-, C 2 2-, and graphitic structures that diffused in the slag and subsequently underwent carburization and deposition at the iron interface.

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Section: Carbon Dissolution Mechanismsmentioning

confidence: 99%

Dissolution of Carbon-Containing Species in CaO–SiO2–Al2O3 Slag

Li,

Liang,

Han

2024

ISIJ Int.

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“…[ 18,19 ] Therefore, applying a potential that facilitates electron conduction promotes the metal–slag reaction. It was further verified in decarburization [ 20 ] and deoxidization [ 21,22 ] experiments that a direct current (DC) electric field between the molten steel and slag significantly accelerated the reaction rate and limitation. In addition to the electric potential driving force, changes in the element distribution coefficient, [ 23 ] slag viscosity, [ 24 ] melting temperature, [ 24 ] and crystallization [ 25 ] under the action of electromagnetic fields also affect the slag–metal reaction.…”

Section: Introductionmentioning

confidence: 99%

Directional Sulfur Removal from Ladle Furnace Slag by Electric Field Strengthening Treatment

Xia

Lei

et al. 2023

steel research int.

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To develop a better understanding of the resource recycling of ladle furnace slag (LFS) in steel enterprises, electric field strengthening by direct current (DC) is tested as an effective method for sulfur removal from slag. Herein, sulfur removal from CaO–SiO2–Al2O3–MgO–CaF2–S (CSMAFS) slag with 4–12 wt% MgO under 0–6 V is observed at 1773 K, and the mechanism resulting from the electric field on sulfur migration is analyzed. It was concluded that with voltage increases in the range of 0–4 V, the slag network structure depolymerizes, and the melting temperature decreases, which are beneficial to sulfur migration. Mg2+, Ca2+, and other cations in the slag (cathode) are reduced, and S2− migrates to the molten steel (anode) to maintain electrochemical balance. However, sulfur migration reveals an opposite trend when the voltage is 6 V because the electric field force generated at 6 V is not sufficient to resist the combined forces of charge resistance and slag diffusion resistance.

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“…[16][17][18] This study focused on the use of molten oxide electrolysis (MOE) as a low-cost, clean, continuous separation method suitable for incorporation into actual steelmaking processes. [19][20][21][22][23][24][25][26][27] MOE is a more environmentally friendly technology than existing smelting methods. MOE cells are being researched to produce liquid iron for commercialization, and it has already been proposed to produce Ti alloys.…”

mentioning

confidence: 99%

Molten Oxide Electrolysis Using Copper-Containing Carbon-Saturated Molten Iron Anode

Natsui¹,

Sato²,

Ito³

et al. 2023

J. Electrochem. Soc.

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This study focused on the use of molten oxide electrolysis (MOE) as a low-cost, clean, continuous separation method suitable for incorporation into actual steelmaking processes. We discussed interfacial behavior from molten iron to slag by anodic polarization of the copper-containing carbon-saturated molten iron (metal phase)–molten oxide (slag phase) interface and investigate the operating mechanism of MOE. The basic constant potential electrolysis between the metal phase (Fe-10 wt% Cu-5.0 wt% C) and slag phase (27 wt% CaO-27 wt% SiO2-45 wt% Al2O3-1.0 wt% CaS) by maintaining 1–2 V vs. Pt at 1773 K in an Ar atmosphere is described. When polarized, a high concentration of dispersed Cu-rich phase was detected locally near the metal–slag interface but not in the phase center of the metal. At the metal–slag interface, the energies of the Fe-rich and Cu-rich phase–slag interfaces decreased due to electric capillarity, and the Cu-rich phase distributed near the interface.

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Electrochemical study on molten iron-carbon electrodes in slag and their decarburization by slag/metal reaction

Cited by 13 publications

References 39 publications

Dissolution of Carbon-Containing Species in CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slag

Dissolution of Carbon-Containing Species in CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slag

Directional Sulfur Removal from Ladle Furnace Slag by Electric Field Strengthening Treatment

Molten Oxide Electrolysis Using Copper-Containing Carbon-Saturated Molten Iron Anode

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