Thermodynamics of Titanium Oxide in CaO–SiO2–Al2O3–MgOsatd–CaF2 Slag Equilibrated with Fe–11mass%Cr Melt

Park, Joo Hyun; Lee, Sang-Beom; Kim, Joo Young; Pak, Jong‐Jin

doi:10.2355/isijinternational.49.337

Cited by 36 publications

(21 citation statements)

References 29 publications

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“…Numberous studies have also demonstrated that the TiO2 acts as a basic oxide in blast furnace slags under neutral atmosphere through their experiments. 10,11,14,15,24) However, the Ti-O has a stable octahedron unit which is different from the Ca-O, resulting in the amphoterism of TiO2 like Al2O3.…”

Section: )mentioning

confidence: 99%

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Zhang

Bai

et al. 2013

ISIJ Int.

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The change of structure in the ternary system CaO-SiO2-TiO2 with TiO2 varying from 0 to 25% mole fraction at a fixed basicity of 0.8 was investigated by means of molecular dynamics simulation. The present simulation demonstrates that most Si is coordinated with 4 O within a tetrahedron while the majority of Ti with 6 O in an octahedron. With the addition of TiO2, the coordination number for Si (CNSi-O) changes from 4.12 to 4.03, while the CNTi-O varies from 5.83 to 5.52. The fraction of bridging oxygen (Si-O-Si) decreases resulting in the depolymerization of silicate structure and the Si-O-Ca is gradually replaced by Si-O-Ti with increasing TiO2 fraction. Two [TiO6] octahedrons are connected by two ways with the angles of Ti-O-Ti equaling to 100° and 140°, and the fraction of them are almost the same for sample with 10 mol-% TiO2 addition. The variation of network connectivity Q n of Si also agrees with the above conclusion. Thus, TiO2 is regarded as basic oxide which acts as modifier in this ternary system in terms of its structure within this system.

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Section: )mentioning

confidence: 99%

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Zhang

Bai

et al. 2013

ISIJ Int.

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“…The MgO solubility in the CaO-SiO 2 -CaF 2 -ZrO 2 and CaO-SiO 2 -CaF 2 -Al 2 O 3 -TiO 2 slags at 1 873 K is also shown for comparison. 12,13) At high temperatures such as 1 873 K, the MgO solubility continuously decreases as 'CϩF' increases from 35 to 65 mass%. However, a plateau region in the composition of 'CϩF'ϭ 75ϳ85 mass% at 1 623 and 1 723 K is also abserved.…”

Section: Effect Of Cao and Caf 2 On Sulfide Capacity Ofmentioning

confidence: 99%

Hot Metal Desulfurization by CaO–SiO2–CaF2–Na2O Slag Saturated with MgO

et al. 2010

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“…The activity of each component in slag phase was calculated by commercial thermochemical computing program, FactSage6.2™ with “FToxid” database (mailto:basicity@hanyang.ac.kr). This database was successfully used for the estimation of the thermodynamic properties of oxide systems through a wide temperature and composition range 1, 6, 11–25…”

Section: Methodsmentioning

confidence: 99%

Competitive Dissolution Mechanism of Sulfur in CaMnSilicate Melts: Structural View

Park

2013

steel research int.

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The sulfide capacities of the CaO-SiO 2 -MnO(-Al 2 O 3 -MgO) slags were measured at 1873 K over a wide composition range using a gas-slag equilibration method. The effects of MnO content and the MnO $ CaO substitution on the sulfide capacity of molten slag were also investigated based on the structural view of silicate melts. In the multicomponent silicate melts containing high MnO (up to about 50 wt%), the sulfide capacity mainly increased with increasing MnO content. Also, the sulfide capacity and the activity of MnO showed a linear relationship with a slope of unity, indicating that MnO is dominant component controlling the sulfur dissolution behavior into Ca-Mn-silicate melts. The sulfide capacity increased as MnO substituted for CaO in the high silica melts (>30 (AE5) wt% SiO 2 ), whereas it decreased by increasing the MnO/CaO ratio in the low silica melts (<30(AE5) wt% SiO 2 ). This tendency of sulfide capacity resulted in the clockwisely rotating iso-capacity contours from MnO-free side to MnO-rich corner in Ca-Mn-silicate melts. The dissolution mechanism of sulfur in Ca-Mn-silicate melts can be explained by the ''Competitive dissolution mechanism.''

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Thermodynamics of Titanium Oxide in CaO–SiO2–Al2O3–MgOsatd–CaF2 Slag Equilibrated with Fe–11mass%Cr Melt

Cited by 36 publications

References 29 publications

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Effect of TiO2 Content on the Structure of CaO–SiO2–TiO2 System by Molecular Dynamics Simulation

Hot Metal Desulfurization by CaO–SiO2–CaF2–Na2O Slag Saturated with MgO

Competitive Dissolution Mechanism of Sulfur in CaMnSilicate Melts: Structural View

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