Experimental and thermodynamic analysis of MgO saturation in the CaO–SiO2–Al2O3–MgO slag system melted in a laboratory resistive furnace

Rocha, Vinicius Cardoso da; Alves, Pedro Cunha; Pereira, Julio Aníbal Morales; Leal, Letícia Pegoraro; Bielefeldt, Wagner Viana; Vilela, Antônio Cezar Faria

doi:10.1016/j.jmrt.2018.05.022

Cited by 3 publications

(4 citation statements)

References 24 publications

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“…Regarding Table 5, it shows that %SiO 2 changed significantly for the arrangement (steel + CM1 + RHA) the content values of calcium oxide (CaO) and %Al 2 O 3 after the experiments presented a downward trend, while SiO 2 increased significantly mainly after the addition of RHA. This increase provides silica dissolution for the slag and can take side on liquid steel reoxidation and rising of non-metallic inclusion (NMI) particles [13][14][15] . The content of % MgO did not change significantly, except for the result of sample II with the increment of RHA.…”

Section: Slag Analysismentioning

confidence: 99%

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

et al. 2023

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The continuous casting tundish is the last metallurgical reactor where molten metal flows before solidifying in the continuous casting mold. A tundish covering powder can be used for improving steel cleanliness; in this case it is named 'active tundish slag'. The objective of this work is to evaluate, in laboratory, the effect of three kinds of tundish covering powders on cleanliness for a SAE 1055 modified steel -a Ca-aluminate, a Ca-Mg-aluminate, and an Al-silicate powder, analysing their interaction with rice hull ash. The forementioned materials were molten on liquid steel, representing different kinds of tundish covering powders which are used in the steel industry: a Ca-Mg-aluminate, an Al-silicate, and a Ca-aluminate. Experiments were performed with and without a top layer of rice hull ash, simulating industrial conditions. Distribution, density, and mean diameter of inclusions were measured through automated inclusion analyses. Through computational thermodynamics it was possible to evaluate deviation from saturation (considering Al 2 O 3 and MgO from refractory) and slag viscosity. It can be stated that the Ca-aluminate tundish covering powder gives better results regarding cleanliness for the SAE 1055 modified steel under laboratory conditions.

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Section: Slag Analysismentioning

confidence: 99%

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

et al. 2023

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“…As FactSage was introduced for ceramic systems, several aluminosilicate-related studies have been published [22][23][24][25] and in one case with direct comparison to experimental data. 26 For the compositions studied here, the measured melting temperatures, obtained from DTA, are compared to the calculated melting temperatures, as presented in Figure 8.…”

Section: Cao + Mgo Aluminosilicatesmentioning

confidence: 99%

Correlation of the Vickers hardness of RO–Al₂O₃–SiO₂ glasses with predicted liquidus temperatures

Lee

Carty

2022

Int J of Appl Glass Sci

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Vickers hardnesses of RO–Al2O3–SiO2 glasses were measured over a broad range of compositions, ranging from ternary endpoints to mixed ratios of RO (CaO with MgO, SrO, or BaO), with the systematic variation of Al2O3 and SiO2 levels. The hardnesses of CAS and MAS glasses are similar, ranging from 6.7 to 7.2 GPa, with the replacement of CaO with MgO producing a marginal increase in hardness. The substitution of SrO or BaO for CaO generally produced in a decrease in hardness down to 4.5 GPa with BaO. The sensitivity to alumina and silica levels, however, was much greater ranging from a minimum of 4.5 GPa to a maximum of ∼8.2 GPa. The correlation of the Vickers hardness with melting temperature was observed in the CAS system but generally not in the RO‐blended glasses. Overall, a combined cation field strength of modifier cations determined the hardness above the critical RO blending ratio.

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“…An important parameter for slag optimization is knowledge of its liquidus temperature. The liquidus temperature affects the rate and kinetics of the chemical reaction between the slag and the metal [12,13,18]. The liquidus temperature of ladle slags was determined for the chemical composition with a MgO content in the range of 0 to 15% by weight and at processing temperatures in the range As can be seen from Figure 1 for 0 wt.% MgO in the slag, all liquidus temperature ranges (isolines) are in the orange range, in the isolines have a narrow liquidus temperature range.…”

Section: Determination Of Slag Liquidus Temperaturementioning

confidence: 99%

“…Based on articles [13,17] we know, if the slag exceeds 40% of the solid phase, a highly viscous mass changes from the slag. Figure 2 shows the proportions of precipitated phases which were evaluated at a constant temperature of 1,575 ° C for different contents of MgO (0, 5, 8, 10%).…”

Section: Influence Of Mgo Content On the Fraction Of The Excluded Phasementioning

confidence: 99%

Thermodynamic Analysis of CaO - SiO2 - Al2O3 - MgO slag system

Sniegoň

Tkadlečková

Huczala

et al. 2021

METAL 2021 Conference Proeedings

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Experimental and thermodynamic analysis of MgO saturation in the CaO–SiO2–Al2O3–MgO slag system melted in a laboratory resistive furnace

Cited by 3 publications

References 24 publications

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

Correlation of the Vickers hardness of RO–Al₂O₃–SiO₂ glasses with predicted liquidus temperatures

Thermodynamic Analysis of CaO - SiO2 - Al2O3 - MgO slag system

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Experimental and thermodynamic analysis of MgO saturation in the CaO–SiO2–Al2O3–MgO slag system melted in a laboratory resistive furnace

Cited by 3 publications

References 24 publications

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

Laboratory Evaluation of Tundish Covering Powders and Rice Hull Ash on Cleanliness for a SAE 1055 Modified Steel

Correlation of the Vickers hardness of RO–Al2O3–SiO2 glasses with predicted liquidus temperatures

Thermodynamic Analysis of CaO - SiO2 - Al2O3 - MgO slag system

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Correlation of the Vickers hardness of RO–Al₂O₃–SiO₂ glasses with predicted liquidus temperatures