Phase-equilibrium data and liquidus for the system “MnO”-CaO-Al2O3-SiO2 at Al2O3/SiO2 of 0.55 and 0.65

Roghani, Ghasem; Jak, Evgueni; Hayes, Peter C.

doi:10.1007/s11663-003-0004-2

Cited by 9 publications

(22 citation statements)

References 3 publications

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“…Roghani et al 26,27) reported compositions of gehlenite in equilibrium with the liquid which deviate significantly from the stoichiometric composition, whereas in the present study the measured compositions were much closer to stoichiometric Ca 2 SiAl 2 O 7 , as shown in Fig. 7.…”

Section: Phase Diagrams Of Thesupporting

confidence: 64%

“…However, these results are quite scattered and in disagreement with each other and with experimental data shown in Fig. 4 26,27) reported phase equilibrium studies at Al 2 O 3 /SiO 2 weight ratios of 0.41, 0.55 and 0.65 at temperatures between 1 100°C and 1 450°C. As well, there are the results of the present experiments (Table 1).…”

mentioning

confidence: 53%

“…Possibly, full equilibrium was not achieved in the experiments of Roghani et al, 26,27) thereby explaining the discrepancy in the gehlenite liquidus in Fig. 6.…”

Section: Phase Diagrams Of Thementioning

confidence: 85%

“…This situation has now been remedied by a new optimization 3) of the MnO-Al 2 O 3 system and, as shown in the present study, MnO activities are now correctly predicted by the model. 26,27) reported phase equilibrium studies at Al 2 O 3 /SiO 2 weight ratios of 0.41, 0.55 and 0.65 at temperatures between 1 100°C and 1 450°C. As well, there are the results of the present experiments (Table 1).…”

Section: Activity Of Mnomentioning

confidence: 99%

“…It can be seen that the calculations are in good agreement with the present experi- 26) Experimental points from Roghani et al 26) and from the present study were measured at Al 2 O 3 /SiO 2 weight ratios over the range 0.34 to 0.46. 26,27) ; ٗ and ᭛ represent gehlenite and anorthite, respectively, from the present study. mental points, but are in agreement with the points of Roghani et al 26) only for the monoxide liquidus.…”

Section: Phase Diagrams Of Thementioning

confidence: 99%

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Phase Equilibria and Thermodynamic Properties of the CaO-MnO-Al2O3-SiO2 System by Critical Evaluation, Modeling and Experiment

et al. 2004

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A complete literature review, critical evaluation and thermodynamic modeling of phase diagrams and thermodynamic properties of the CaO-MnO-Al 2 O 3 -SiO 2 system at 1 bar pressure are presented. A few new quaternary liquidus measurements are also reported. The modeling is based solely upon model parameters obtained by critical evaluation and optimization of the four ternary subsystems. The predicted quaternary properties and phase diagrams are in very good agreement with measurements. Complex phase relationships are elucidated and discrepancies among the data are resolved. The database of model parameters can be used along with software for Gibbs energy minimization in order to calculate any phase diagram section or thermodynamic property from 25°C to above the liquidus at all compositions.KEY WORDS: solution thermodynamics; CaO-MnO-Al 2 O 3 -SiO 2 system; manganese alloy production; phase equilibria.es, but also equilibria between liquid slags and manganese alloys, were considered.In a few cases, there was disagreement between reported and calculated liquidus compositions. A few key experiments were thus carried out as part of the present study in order to resolve this conflict. It was found that the results verified the model calculations.The thermodynamically consistent phase diagram sections, calculated from the model parameters, elucidate the complex phase relationships in this system, and phase equilibria are predicted in regions of temperature and composition where no measurements have been reported.All thermodynamic calculations were performed with the FactSage thermodynamic computing system. 1) Phase equilibria are calculated by global Gibbs energy minimization. By coupling the presently developed database with other evaluated F*A*C*T databases for metallic solutions, gases, etc., FactSage can be used to compute complex slag/ metal/solid/gas equilibria. For example, equilibrium between CaO-MnO-SiO 2 -Al 2 O 3 inclusions and alloy phases can be simulated and studied. Examples of applications to inclusion engineering of Mn/Si deoxidized steel will be presented elsewhere. 7) Thermodynamic ModelsThe thermodynamic properties and phase equilibria of all binary and ternary sub-systems of the CaO-MnOAl 2 O 3 -SiO 2 quaternary system have been critically evaluated by the authors, [2][3][4]8,9) and optimized model parameters have been obtained which reproduce all available binary and ternary data within error limits.The following solution phases (phases of variable composition) are found in the CaO-MnO-Al 2 O 3 -SiO 2 quaternary system [2][3][4]8,9) : (i) slag (molten oxide phase), CaO- Liquidus projections of the four ternary sub-systems, calculated from the previously optimized model parameters, are shown in Fig. 1.For the molten oxide (slag) phase, the Modified Quasichemical Model 10,11) was used. This model has been recently further developed and summarized.12,13) This model takes into account short-range-ordering by consider- ing second-nearest-neighbor pair exchange reactions. Although manganese can exist i...

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Section: Phase Diagrams Of Thesupporting

confidence: 64%

mentioning

confidence: 53%

“…Possibly, full equilibrium was not achieved in the experiments of Roghani et al, 26,27) thereby explaining the discrepancy in the gehlenite liquidus in Fig. 6.…”

Section: Phase Diagrams Of Thementioning

confidence: 85%

Section: Activity Of Mnomentioning

confidence: 99%

Section: Phase Diagrams Of Thementioning

confidence: 99%

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Phase Equilibria and Thermodynamic Properties of the CaO-MnO-Al2O3-SiO2 System by Critical Evaluation, Modeling and Experiment

et al. 2004

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Peter Charles Hayes’ Contributions to Metallurgical Research: Brief Biography and List of Publications

Mackey

Jak

2018

The Minerals, Metals &Amp; Materials Series

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Behavior of Slag in Ferromanganese and Silicomanganese Smelting Process

Lee

Kolbeinsen

2021

Metall Mater Trans B

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A review of studies by Safarian et al. and Kim show that the smelting reaction at equilibrium for ferromanganese and silicomanganese alloys is defined by the coupled reaction in the carbon-saturated condition $$ 2\underline{\text{Mn}} + \, \left( {{\text{SiO}}_{ 2} } \right) \, = { 2 }\left( {\text{MnO}} \right) \, + \underline{\text{Si}} $$ 2 Mn ̲ + SiO 2 = 2 MnO + Si ̲ . The behavior of slag at equilibrium is described by MnO and SiO2 as dependent variables and by non-reacting species, CaO, MgO, and Al2O3, as independent variables. Its characteristic behaviors are assessed in the pseudobinary system of MnO and SiO2 fixed by non-reacting components with analyses of ferromanganese and silicomanganese slag from one-month smelting operations. The behavior of fluid slag is defined by their melting temperature provided by phase equilibria of slag system. Liquidus of manganese slag systems by Kang et al., Zhao et al., and Roghani et al. is reconstructed in coordinates of MnO and SiO2 at fixed contents of CaO, MgO, and Al2O3. Conditions for fluid smelting slag are examined by referencing characteristic behaviors of smelting slag to liquidus of manganese slag systems to assess the effect of MgO and Al2O3. MgO facilitates fluid silicomanganese slag but would make ferromanganese slag viscous. Al2O3 makes silicomanganese slag fluid at Al2O3 content with 0.41 by weight ratio to SiO2. At higher contents of Al2O3, silicomanganese slag would be viscous with low MnO contents in slag. Al2O3 facilitates the development of fluid ferromanganese slag.

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Phase-equilibrium data and liquidus for the system “MnO”-CaO-Al2O3-SiO2 at Al2O3/SiO2 of 0.55 and 0.65

Cited by 9 publications

References 3 publications

Phase Equilibria and Thermodynamic Properties of the CaO-MnO-Al2O3-SiO2 System by Critical Evaluation, Modeling and Experiment

Phase Equilibria and Thermodynamic Properties of the CaO-MnO-Al2O3-SiO2 System by Critical Evaluation, Modeling and Experiment

Peter Charles Hayes’ Contributions to Metallurgical Research: Brief Biography and List of Publications

Behavior of Slag in Ferromanganese and Silicomanganese Smelting Process

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