Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Allertz, Carl; Sichen, Du

doi:10.1007/s40831-015-0018-4

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…Thus, the growth rate of sulfur removal decreases at 0.05 bar oxygen partial pressure. These findings deviate significantly from the recent reports by Allertz et al [19] and Hiraki et al Figure 15 illustrates the degree of sulfur removal plotted against reaction time for various conditions. The oxidation condition in Figure 15a is the change in the total flow of reaction gas in a corundum crucible at 0.5 bar oxygen partial pressure.…”

Section: Removal Rate Of Sulfur From Slagcontrasting

confidence: 88%

Effect of Flow Rate and Partial Pressure of Oxygen on Desulfurization of KR Slag

Jiang,

Muvunyi

et al. 2024

Metals

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KR (Kanbara Reaction) desulfurization slag is a solid waste that is not sufficiently utilized. This is because the KR desulfurization slag contains 1–2.5% sulfur, which is directly used in steel smelting to increase the sulfur content in molten steel. Therefore, the possibility of oxidation desulfurization of KR desulfurization slag was studied in this study. Experiments were conducted to investigate the possibility of removing sulfur from used KR (Kambara Reaction) slag with oxidation. The KR slag samples were treated with oxidative desulfurization in the oxygen partial pressure range of 0.05 bar–1.00 bar, with a gas flow rate ranging from 2 L min−1 to 6 L min−1, and at a temperature of 1420 °C. X-ray diffraction (XRD), an infrared carbon sulfur analyzer, and scanning electron microscopy–energy dispersive X-ray spectrometry (SEM–EDS) analysis were used to reveal the oxidative desulfurization mechanism of KR desulfurization slag. At low oxygen pressure (PO2 < 0.20 bar), the desulfurization rate of slag oxidized for 120 min increased with the increase in oxygen partial pressure. At high oxygen pressure (PO2 ≥ 0.20 bar), the desulfurization rate of slag samples did not change with the change in oxygen partial pressure, and the desulfurization rate was higher than 93.5%. At low oxygen pressure (PO2 < 0.20 bar), the residual sulfur in the slag after oxidation still existed in the slag as the CaS phase. At high oxygen pressure (PO2 ≥ 0.20 bar), the residual sulfur in the slag oxidized from the CaS phase to the 11CaO·7Al2O3·CaS phase in the slag. The sulfur removal rate was directly correlated with the slag surface area and the flow rate of the reaction gas, and it increased with an increase in both surface area and gas flow rate.

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Section: Removal Rate Of Sulfur From Slagcontrasting

confidence: 88%

Effect of Flow Rate and Partial Pressure of Oxygen on Desulfurization of KR Slag

Jiang,

Muvunyi

et al. 2024

Metals

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“…An increase in collected sulfur was observed as the applied anodic potential increased. The sulfur evaporation in the slag is known to occur in the form of SO2 gas according to the following two reactions [14][15][16]:…”

Section: Anodic Reaction Of Sulfurmentioning

confidence: 99%

“…Based on Equations 7and (8), and considering the case where sulfide and sulfate ions are stabilized by Ca 2+ cations in the slag, the thermodynamic stable phase of sulfur is shown in Figure 4 [17]. The sulfur evaporation in the slag is known to occur in the form of SO 2 gas according to the following two reactions [14][15][16]:…”

Section: Anodic Reaction Of Sulfurmentioning

confidence: 99%

A Novel Electrochemical Process for Desulfurization in the CaO-SiO2-Al2O3 System

Lee

Min

2020

Materials

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The effect of electric potential on the sulfide capacity of the CaO-SiO2-Al2O3 system was evaluated by applying voltages in the range of −1.5 to 1.5 V at 1823 K in a C/CO gas equilibrium. When the cathodic potential (−1.5 to 0 V) was applied, it was confirmed that the sulfur partition ratio increased based on the electrochemical reaction of sulfur (S + 2e− = S2−). However, the reversibility of the electrochemical resulfurization reaction (S2− = S + 2e−) in slag was not established in the reverse (anodic) potential region (0–1.5 V), yet the sulfur partition ratio increased. In particular, sulfur evaporation was observed in the anodic potential region. Therefore, in the present study, potential anodic electro-desulfurization mechanisms based on sulfur evaporation are proposed. To verify these mechanisms, sulfur evaporation is discussed in detail as a function of the thermodynamic stability of sulfur in the slag.

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“…The primary methods for removing sulfur from LFS include solid-state hightemperature oxidation, [13] solid-state hydrothermal leaching, [14] molten-state thermal oxidation, [15] and electric field strengthening. [16,17] However, in the first three methods previously listed, the existing forms of CaS and 11CaO-7A1 2 O 3 -CaS solid solutions hinder sulfur migration, wasting large amounts of cooling water and slag heat during the treatment process and causing secondary pollution by SO 2 .…”

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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Possibility of Sulfur Removal from Ladle Slag by Oxidation in the Temperature Range 1373–1673 K

Cited by 13 publications

References 5 publications

Effect of Flow Rate and Partial Pressure of Oxygen on Desulfurization of KR Slag

Effect of Flow Rate and Partial Pressure of Oxygen on Desulfurization of KR Slag

A Novel Electrochemical Process for Desulfurization in the CaO-SiO2-Al2O3 System

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

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