Addition of V2O5 and V2O3 to the CaO–FeO–Fe2O3–MgO–SiO2 database for vanadium distribution and viscosity calculations

Jantzen, T.; Yazhenskikh, Elena; Hack, Klaus; Baben, Moritz to; Wu, Guixuan; Müller, Michael

doi:10.1016/j.calphad.2021.102284

Cited by 14 publications

(4 citation statements)

References 46 publications

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“…Du et al [22] also performed an evaluation and modeling of the system by using the modified quasichemical model to describe the liquid oxide solution and the two sublattice spinel solution model within the framework of the compound energy formalism to the spinel solid solution Fe 3-x V x O 4 . In addition, the modeling works of some more complex systems, such as the Fe-Ti-V-O system [23] and CaO-FeO-Fe 2 O 3 -MgO-SiO 2containing V 2 O 3 and V 2 O 5 system [24], were reported.…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Miao,

Li,

Yan

2023

Metals

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In the present study, an approach of determining the standard Gibbs energy of formation of Fe3–xVxO4 was proposed firstly, then the standard Gibbs energies of formation of a variety of Fe3–xVxO4 were determined experimentally, and finally, a calculating model of the standard Gibbs energy of formation of Fe3–xVxO4 was established. The detailed results are as follows: (1) the standard Gibbs energy of formation of Fe3–xVxO4 can be determined successfully by two steps; the first is to measure the chemical potential of Fe in Fe3–xVxO4 under fixed oxygen partial pressure, the second is to derive the chemical potential of V in Fe3–xVxO4 by Gibbs–Duhem relation; (2) the standard Gibbs energies of formation of Fe3–xVxO4 are mainly decided by the Fe/V molar ratio, and almost not influenced by the oxygen partial pressure in the range from 2.39 × 10−12 to 3.83 × 10−11 atm; (3) in this oxygen partial pressure range, the standard Gibbs energies of formation of Fe3–xVxO4 can be calculated satisfactorily by the following model: ΔfGFe3−xVxO4θJ/mol=1−x/2ΔfGFe3O4θ+x/2ΔfGFeV2O4θ+1−x/2RTln1−x/2+x/2RTlnx/2 − 168627.481−x/2x/2.

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Section: Introductionmentioning

confidence: 99%

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Miao,

Li,

Yan

2023

Metals

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“…Vanadium oxide is produced from ore feedstock, concentrates, petroleum residues, and vanadium‐containing steelmaking slags, 14–20 and its thermodynamic properties in slag systems have been investigated by many researchers 21–24,27–32 . Notably, vanadium has an electronic configuration of [Ar]4s 2 3d 3 , yielding multivalent states from +2(d 3 ) to +5(d 0 ).…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13] Vanadium oxide is produced from ore feedstock, concentrates, petroleum residues, and vanadium-containing steelmaking slags, [14][15][16][17][18][19][20] and its thermodynamic properties in slag systems have been investigated by many researchers. [21][22][23][24][27][28][29][30][31][32] Notably, vanadium has an electronic configuration of [Ar]4s 2 3d 3 , yielding multivalent states from +2(d 3 ) to +5(d 0 ). Owing to the complexity of vanadium in oxide systems, the mixed-valence states of vanadium oxides have been investigated using titration methods, 22 thermogravimetry (TG), 23 electron paramagnetic resonance (EPR) spectroscopy, 24 and X-ray photoelectron spectroscopy (XPS).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of vanadium oxide in CaO–SiO₂–VO_x system at 1873 K

Park

Jung

2022

J Am Ceram Soc.

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Owing to the complexity of the multivalence states of vanadium oxides in slag systems and experimental difficulties, thermodynamic properties of vanadium oxides have not been established yet. In the present study, the mixed‐valence states and activities of the vanadium oxides in CaO–SiO2–VOx slag were investigated experimentally at 1873 K and oxygen partial pressures of 3.2 × 10–9 and 3.1 × 10–7 atm. After the CaO–SiO2–VOx slag had equilibrated with a platinum strip, the mixed‐valence states of the vanadium oxides in the slag were estimated by performing X‐ray photoelectron spectroscopy, and the activities of the vanadium oxides in the slag were calculated using the activity of vanadium in the platinum strip at equilibrium using thermodynamic equations. At an oxygen partial pressure of 3.2 × 10–9 atm, V3+ was the dominant ion and V4+ was the second most abundant ion. With increasing VOx content or basicity (CaO/SiO2 ratio), the fraction of V3+ decreased, whereas that of V4+ increased. The activity of VO1.5 was greater than those of the other vanadium oxides. On the other hand, when the oxygen partial pressure increased to 3.1 × 10–7 atm, V4+ became the dominant ion. As the slag basicity increased, the fraction of V4+ increased further, whereas that of V3+ decreased to less than that of V5+. The activity of VO1.5 was greater than those of the other vanadium oxides, limiting the effect of the slag basicity. Consequently, the valence state of vanadium oxide was affected by the slag basicity at a low oxygen partial pressure by acting as a network modifier. In contrast, at a higher oxygen partial pressure, the activity of vanadium oxide increased further but was not affected by the slag basicity because of its contribution to the network structure formation. The present findings can be applied to optimize the slag composition in steel refining or vanadium pentoxide production processes to increase the yield rate of vanadium.

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“…In addition, most previous studies focused on the viscosity of FeO-V 2 O 3 -SiO 2 systems without Al 2 O 3 , and the melt compositions in these previous investigations were different from those in the present area. [32][33][34][35] Therefore, it is necessary to investigate the viscosity of the FeO-Cr 2 O 3 -MnO-V 2 O 3 -SiO 2 -TiO 2 -CaO-Al 2 O 3 system to provide fundamental information for the production of FeV alloy from PVS in order to achieve green treatment of vanadium slag and resourceful utilization of AD.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Viscosity and Structure Property during Aluminothermic Reduction of Vanadium‐Enriched Slag

Zhang

Chen

Sun

2022

steel research int.

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Aluminum dross is a promising reductant for extracting vanadium to enable the direct production of ferrovanadium alloy in pre-reduced vanadium-rich slag (PVS). The evolution of the viscosity of PVS is measured with various A/M ratios (w()), representing different reduction stages. The compositions and structural properties of the melts are analyzed using X-ray powder diffraction, scanning electron microscopy, and Raman spectroscopy. The results show that with an increase in the mass ratio of Al 2 O 3 to (FeOþCr 2 O 3 þMnOþV 2 O 3 þAl 2 O 3 ) in the slag transformed from a solid-liquid mixture to a single liquid phase at 1873 K. When A/M increases from 0.29 to 0.53, Q 0 and Q 1 polymerize into Q 2 , resulting in a slow increase in viscosity from 0.091 to 0.158 Pa s. As A/M further increased to 1.00, Q 0 disappeared, Q 3 appeared, and the fraction of Al-O-Si increased to 37.7%, indicating that the simple aluminosilicate structural units are polymerized into complex structural units. Meanwhile, the viscosity increases to 0.338 Pa s. Al 2 O 3 acts as a network former and strengthens the degree of polymerization of the melt. The variation ranges of the apparent activation energy, structural complexity, and the average number of non-bridging oxygen are 139.23-215.12 kJ mol À1 , 0.57-2.97, and 2.16-1.05, respectively.

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Addition of V2O5 and V2O3 to the CaO–FeO–Fe2O3–MgO–SiO2 database for vanadium distribution and viscosity calculations

Cited by 14 publications

References 46 publications

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Thermodynamic investigation of vanadium oxide in CaO–SiO₂–VO_x system at 1873 K

Evolution of Viscosity and Structure Property during Aluminothermic Reduction of Vanadium‐Enriched Slag

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Addition of V2O5 and V2O3 to the CaO–FeO–Fe2O3–MgO–SiO2 database for vanadium distribution and viscosity calculations

Cited by 14 publications

References 46 publications

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Experimental Determination of the Standard Gibbs Energy of Formation of Fe3–xVxO4 at 1473 K

Thermodynamic investigation of vanadium oxide in CaO–SiO2–VOx system at 1873 K

Evolution of Viscosity and Structure Property during Aluminothermic Reduction of Vanadium‐Enriched Slag

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Thermodynamic investigation of vanadium oxide in CaO–SiO₂–VO_x system at 1873 K