Liquidus Lines in the Fe-rich Region of the FeO&lt;sub&gt;x&lt;/sub&gt;–CaO–SiO&lt;sub&gt;2&lt;/sub&gt;–Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; System at 1573 K under Oxygen Partial Pressures between 10&lt;sup&gt;−6&lt;/sup&gt; and 10&lt;sup&gt;−2&lt;/sup&gt; atm

Katahira, Yoshitaka; Watanabe, Takashi; Hayashi, Miyuki

doi:10.2355/isijinternational.isijint-2015-229

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…6(b)-6(d). The C 2 S phase observed in the present work is granular; in contrast, it is known that C 2 S produced during the cooling process is dendritic 20) or fine needle-shaped 19) microcrystalline. Thus, it is supposed that the C 2 S phase in samples 14, 16 and 17 is an equilibrium phase.…”

Section: Confirmation Of Equilibration By Preliminarycontrasting

confidence: 52%

“…Thus, it is supposed that the C 2 S phase in samples 14, 16 and 17 is an equilibrium phase. Figure 7 shows the relation between FeO x and MgO concentrations in the liquid phase in equilibrium with magnetite for samples 1-5 with C/S = 1.0 in comparison with reported values for the same sample without MgO 20) equilibrated at 1 573 K and P O2 = 2.5 × 10 − 6 atm. The FeO x concentration in the liquid phase decreases with an increase in the MgO concentration, which means that the liquid phase area equilibrated with the magnetite phase at this temperature becomes smaller with increasing MgO concentration.…”

Section: Confirmation Of Equilibration By Preliminarymentioning

confidence: 94%

“…Crucible B was originally developed by Hayes and coauthors 19) and, in the present work, was made of platinum wire having 0.5 mm diameter, on which about 0.22 g of a sample mixture having 10 mm diameter was placed after the sample being uniaxially cold-pressed. This type of crucible was used for samples having C/S ≥ 1.5, which samples would contain dendritic 2CaO·SiO 2 (hereinafter denoted as C 2 S) after quenching: 20) however, dendritic C 2 S is not a phase equilibrated with FeO x at 1 573 K and is produced during the cooling process. Using crucible B, the molten sample was maintained in the form of film between the gaps of the wire, which resulted in higher quenching rates to minimize C 2 S crystallisation.…”

Section: Equilibrium Experimentsmentioning

confidence: 99%

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Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeOx–CaO–SiO2–MgO System

et al. 2017

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Section: Confirmation Of Equilibration By Preliminarycontrasting

confidence: 52%

Section: Confirmation Of Equilibration By Preliminarymentioning

confidence: 94%

Section: Equilibrium Experimentsmentioning

confidence: 99%

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Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeOx–CaO–SiO2–MgO System

et al. 2017

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Activities of FeO1.33 in the FeOx–CaO–SiO2 and FeOx–CaO–SiO2–Al2O3 Slags at 1573 K Under Oxygen Partial Pressures between 10−6 and 10−2 atm

Katahira

Hayashi

2016

ISIJ Int.

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Qualities of sinters such as reducibility and strength are controlled by morphologies and mineral phases in iron ore sinters. Main mineral phases are hematite, magnetite and calcium ferrite. Slag phases are also included in sinters, which have been mainly liquid phases during the sintering process. Since iron ions in slags are hardly reduced to metallic irons in a blast furnace, iron oxides such as hematite and magnetite and calcium ferrite should be precipitated from molten slags during the sintering process. Precipitation of iron oxides and calcium ferrites from molten slags depends on the activity of FeO x in molten slags from the thermodynamic view point. Therefore, the activities of FeO 1.33 have been measured over the wide ranges of chemical compositions in the single liquid phases of the FeO x -CaO-SiO 2 and FeO x -CaO-SiO 2 -Al 2 O 3 slags at 1 573 K under oxygen partial pressures between 10 − 6 and 10 − 2 atm. It has been found that the a FeO1.33 values have maximum at the CaO/SiO 2 (mass%) ratios of 0.9-1.0 and 1.3-1.4 for the samples with 35 mass%FeO x equilibrated at P O2 = 1.0 × 10 − 2 atm and 1.0 × 10 − 4 atm, respectively. For the samples at P O2 = 2.5 × 10 − 6 atm, on the other hand, a FeO1.33 monotonically increases with increasing the CaO/SiO 2 ratio within the compositional range of the single liquid region. As for the effect of the Al 2 O 3 addition on the activities, the dependency of the activity on the CaO/SiO 2 ratio becomes moderate with increasing the Al 2 O 3 addition on the sample at P O2 = 2.5 × 10 − 6 atm. KEY WORDS: FeO x -SiO 2 -CaO system; oxygen partial pressure; Al 2 O 3 ; FeO x activity.

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Review on the Phase Equilibria in Iron Ore Sinters

2020

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Liquidus Lines in the Fe-rich Region of the FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> System at 1573 K under Oxygen Partial Pressures between 10<sup>−6</sup> and 10<sup>−2</sup> atm

Cited by 3 publications

References 11 publications

Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–MgO System

Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–MgO System

Activities of FeO<sub>1.33</sub> in the FeO<sub>x</sub>–CaO–SiO<sub>2</sub> and FeO<sub>x</sub>–CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Slags at 1573 K Under Oxygen Partial Pressures between 10<sup>−6</sup> and 10<sup>−2</sup> atm

Review on the Phase Equilibria in Iron Ore Sinters

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