Calculation and Analysis of Sulfide Capacities for CaO-Al2O3-SiO2-MgO-TiO2 Slags

Ren, Zhong-shan; Hu, Xiaojun; Chou, Kuo‐Chih

doi:10.1016/s1006-706x(13)60151-x

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…Metallurgists have developed several sulfide capacity prediction models to describe the relationship between sulfide capacity and slag composition, such as the KTH and optical basicity models. [68][69][70][71][72][73][74][75][76] Table 3 displays typical sulfide capacity models for slag and the improvements made by later generations.…”

Section: Sulfide Capacity Prediction Modelmentioning

confidence: 99%

Research Progress of Desulfurization Refining Slag: A Review

Qiu,

Zhang,

Gao

et al. 2023

steel research int.

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The development of refining slag is the core of the ladle furnace (LF) refining processes and is essential for fast and effective desulfurization refining. Desulfurization reactions are mainly determined by slag–steel interactions, which are closely related to the physicochemical properties of slags. This study reviews the research progress of desulfurization refining slag for the LF process. First, the chemical composition of the refining slag was described, and then three theories of desulfurization and the concepts of sulphide capacity and sulfur partition ratio were introduced. Second, the effects of operating parameters and slag components on desulfurization were examined. Furthermore, the microscopic analysis of the desulfurization process was performed. The prediction models of slag properties related to desulfurization were summarized. Finally, a research direction for LF desulfurization refining was proposed. The question of how to ensure the uniformity of desulfurization remains open. The industrialization of the new refining slag developed by replacing CaO with BaO or Li2O and replacing CaF2 with B2O3 should be accelerated to solve the CaF2 slag volatilization problem. One of the most pressing issues that must be addressed is improving the accuracy of the existing slag performance forecast model.This article is protected by copyright. All rights reserved.

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Section: Sulfide Capacity Prediction Modelmentioning

confidence: 99%

Research Progress of Desulfurization Refining Slag: A Review

Qiu,

Zhang,

Gao

et al. 2023

steel research int.

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“…Considering the charge compensation of [AlO 4 ] 5– by Ca 2+ , Mills et al [31] modified the optical basicity Λ to the corrected optical basicity Λ corr . If N CaO is higher than N Al2O3 in CaO‐Al 2 O 3 ‐SiO 2 ‐MgO slag, the corrected optical basicity Λ corr of slag can be calculated as

{normalΛ}^{corr} = \frac{{normalΛ}_{CaO} \cdot (N_{C a O} - N_{A {normall}_{2} {normalO}_{3}}) + {normalΛ}_{{Al}_{2} O_{3}} \cdot N_{{Al}_{2} O_{3}} \cdot 3 + {normalΛ}_{{SiO}_{2}} \cdot N_{{SiO}_{2}} \cdot 2 + {normalΛ}_{MgO} \cdot N_{MgO}}{(N_{CaO} - N_{{Al}_{2} O_{3}}) + N_{{Al}_{2} O_{3}} \cdot 3 + N_{{SiO}_{2}} \cdot 2 + N_{MgO}}

…”

Section: Model Descriptionmentioning

confidence: 99%

“…Considering the charge compensation of [AlO 4 ] 5by Ca 2þ , Mills et al [31] modified the optical basicity L to the corrected optical basicity L corr . [30] If N CaO is higher than N Al2O3 in CaO-Al 2 O 3 -SiO 2 -MgO slag, the corrected optical basicity L corr of slag can be calculated as [31] Figure 3 shows the relationship between the corrected optical basicity and experimental measured sulfide capacity at different temperature. The corrected optical basicity was calculated using the slag composition data taken from the literature.…”

Section: Modeling Based On Corrected Optical Basicitymentioning

confidence: 99%

“…[26][27][28][29] However, the research of this effect on sulfide capacity is very limited. Ren et al [30] considered the effect of charge compensation and proposed a new model to calculate the sulfide capacity of CaO-Al 2 O 3 -SiO 2 -MgO (-TiO 2 ) slags. However, the data used in their study were fewer and the applicable range of the model was not given.…”

Section: Introductionmentioning

confidence: 99%

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A New Sulfide Capacity Model for CaO-Al₂O₃-SiO₂-MgO Slags Based on Corrected Optical Basicity

Hao

Wang

2015

steel research int.

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A new sulfide capacity model for CaO‐Al2O3‐SiO2‐MgO slags has been developed based on corrected optical basicity. The present model has taken charge compensation into consideration and postulated that Al exits in the form of [1/2Ca(AlO4)]4– when NCaO is higher than NAl2O3 in slag. The model predicted sulfide capacities agree well with experimental measured values for CaO‐Al2O3, CaO‐Al2O3‐SiO2, CaO‐Al2O3‐MgO, and CaO‐Al2O3‐SiO2‐MgO slags. A mean deviation of 3.23% is achieved for the present model in basic Al2O3 containing slags and this value is obviously lower than that of other models. The applicable range of the present model is given.

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“…Foi definida primeiramente por Fincham e Richardson [31], considerando um equilíbrio escórias-gás de diversos sistemas (CaO-Al2O3-SiO2; CaO-SiO2; CaO-Al2O3; MgO-SiO2), de acordo com a Equação 10 [32].…”

Section: Capacidade Sulfeto E Partição De Enxofreunclassified

Utilização de resíduo de mármore e de óxido de boro em escórias sintéticas dessulfurantes para aços.

Coleti¹

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Este exemplar foi revisado e corrigido em relação à versão original, sob responsabilidade única do autor e com a anuência de seu orientador. A Clara pela paciência, incentivo e amor.A Escola Politécnica pela estrutura disponibilizada. VI ABSTRACTThe present market requires from steel industry better quality of steel that was produced by processes that cause less impact to the environment. Thus, this study aims to recycle the marble waste generated from the industry of ornamental rocks, which has in its composition calcium oxide (CaO) and magnesium oxide (MgO). Using this waste in the steel production process, the amount of CaO is enough to replace the lime in the slag whereas the MgO contributes to reduce the wear of the refractory material. Furthermore, it was part of this study to test the replacement of the fluorite by boron oxide as desulfurizing flux into the composition of mixtures. The marble waste was characterized using the following techniques: chemical analysis (EDXFR), particle size analysis with a light scattering method, specific surface area by BET method, Xrays diffraction (XRD), scanning electron microscopy (SEM), analysis of micro-regions by energy dispersive spectroscopy (EDS) and thermogravimetry analysis (TG) with mass spectrometer coupled (MS). In order to verify the efficiency of desulfurization, mixtures were formulated using conventional lime or marble waste, and fluorite or boron oxide. The blends were prepared using the computational thermodynamics programs, Thermo-Calc and FactSage. These mixtures were added into the molten steel under an argon atmosphere and the metallic bath stirred by a rotor of alumina at the temperature of 1600ºC. Metal Samples were removed periodically in order to verify the variation of sulfur content during the experiments. The characterization of marble waste showed in its composition the amount of 40% CaO and 14% MgO in a CaCO3 and MgCO3 carbonates forms. It was also observed a mass loss of 42.1%, in the form of CO2 at a temperature of 780 ° C. The experiments showed that the tested mixtures desulfurization efficiency was above 60%, in most cases.

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Calculation and Analysis of Sulfide Capacities for CaO-Al2O3-SiO2-MgO-TiO2 Slags

Cited by 14 publications

References 13 publications

Research Progress of Desulfurization Refining Slag: A Review

Research Progress of Desulfurization Refining Slag: A Review

A New Sulfide Capacity Model for CaO-Al₂O₃-SiO₂-MgO Slags Based on Corrected Optical Basicity

Utilização de resíduo de mármore e de óxido de boro em escórias sintéticas dessulfurantes para aços.

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Calculation and Analysis of Sulfide Capacities for CaO-Al2O3-SiO2-MgO-TiO2 Slags

Cited by 14 publications

References 13 publications

Research Progress of Desulfurization Refining Slag: A Review

Research Progress of Desulfurization Refining Slag: A Review

A New Sulfide Capacity Model for CaO-Al2O3-SiO2-MgO Slags Based on Corrected Optical Basicity

Utilização de resíduo de mármore e de óxido de boro em escórias sintéticas dessulfurantes para aços.

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A New Sulfide Capacity Model for CaO-Al₂O₃-SiO₂-MgO Slags Based on Corrected Optical Basicity