# Phase relationship of CaO-SiO 2-FeO-5 mass pct P 2O 5 system with low oxygen partial pressure at 1673 K (1400 °c)

Xu Gao, Hiroyuki Matsuura, Il Sohn, Wanlin Wang, Dong Joon Min, Fumitaka Tsukihashi

Research output: Contribution to journalArticle

22 Citations (Scopus)

### Abstract

Dephosphorization by using multiphase flux could considerably decrease the consumption of CaO and prevent the addition of fluorite. However, the equilibrium phase relationship within this system, which is of significant importance for understanding the formation mechanism of multiphase flux, remains unclear. Thus, it is required to provide reliable phase diagrams of the basic slag system of multiphase flux. In this research, the phase relationship of the CaO-SiO 2-FeO-5 mass pct P 2O 5 system at 1673 K (1400 °C) with $${P}-{{{\text{O}}-{2} }}$$ of 9.24 × 10 -11 atm has been studied by using the chemical equilibration method. It has been found that solid solution consists mainly of 2CaO•SiO 2-3CaO•P 2O 5, but occasionally it contains 3CaO•SiO 2. Liquidus saturated with solid solution shrinks toward the FeO corner compared with the isothermal at 1673 K (1400 °C) of the CaO-SiO 2-FeO system equilibrated with metallic iron. Thermodynamically stable CaO-FeO phase is confirmed, which could promote the condensation of 3CaO•P 2O 5 into the solid solution and increase the phosphorus partition ratio between the solid solution and molten slag. Based on the regular solution model, the effect of T.Fe and CaO content in the liquid phase on the phosphorus partition ratio between the solid solution and molten slag is discussed.

Original language English 694-702 9 Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science 43 4 https://doi.org/10.1007/s11663-012-9651-5 Published - 2012 Aug 1

Partial pressure
partial pressure
Solid solutions
solid solutions
Oxygen
slags
Slags
oxygen
Fluxes
Phosphorus
phosphorus
Molten materials
partitions
Fluorspar
liquidus
fluorite
Phase equilibria
Phase diagrams
Condensation
liquid phases

### All Science Journal Classification (ASJC) codes

• Condensed Matter Physics
• Mechanics of Materials
• Metals and Alloys
• Materials Chemistry

### Cite this

@article{516d76b7ec4e46b5bf2add50954a9ce7,
title = "Phase relationship of CaO-SiO 2-FeO-5 mass pct P 2O 5 system with low oxygen partial pressure at 1673 K (1400 °c)",
abstract = "Dephosphorization by using multiphase flux could considerably decrease the consumption of CaO and prevent the addition of fluorite. However, the equilibrium phase relationship within this system, which is of significant importance for understanding the formation mechanism of multiphase flux, remains unclear. Thus, it is required to provide reliable phase diagrams of the basic slag system of multiphase flux. In this research, the phase relationship of the CaO-SiO 2-FeO-5 mass pct P 2O 5 system at 1673 K (1400 °C) with $${P}-{{{\text{O}}-{2} }}$$ of 9.24 × 10 -11 atm has been studied by using the chemical equilibration method. It has been found that solid solution consists mainly of 2CaO•SiO 2-3CaO•P 2O 5, but occasionally it contains 3CaO•SiO 2. Liquidus saturated with solid solution shrinks toward the FeO corner compared with the isothermal at 1673 K (1400 °C) of the CaO-SiO 2-FeO system equilibrated with metallic iron. Thermodynamically stable CaO-FeO phase is confirmed, which could promote the condensation of 3CaO•P 2O 5 into the solid solution and increase the phosphorus partition ratio between the solid solution and molten slag. Based on the regular solution model, the effect of T.Fe and CaO content in the liquid phase on the phosphorus partition ratio between the solid solution and molten slag is discussed.",
author = "Xu Gao and Hiroyuki Matsuura and Il Sohn and Wanlin Wang and Min, {Dong Joon} and Fumitaka Tsukihashi",
year = "2012",
month = "8",
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doi = "10.1007/s11663-012-9651-5",
language = "English",
volume = "43",
pages = "694--702",
journal = "Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science",
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Phase relationship of CaO-SiO 2-FeO-5 mass pct P 2O 5 system with low oxygen partial pressure at 1673 K (1400 °c). / Gao, Xu; Matsuura, Hiroyuki; Sohn, Il; Wang, Wanlin; Min, Dong Joon; Tsukihashi, Fumitaka.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 43, No. 4, 01.08.2012, p. 694-702.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Phase relationship of CaO-SiO 2-FeO-5 mass pct P 2O 5 system with low oxygen partial pressure at 1673 K (1400 °c)

AU - Gao, Xu

AU - Matsuura, Hiroyuki

AU - Sohn, Il

AU - Wang, Wanlin

AU - Min, Dong Joon

AU - Tsukihashi, Fumitaka

PY - 2012/8/1

Y1 - 2012/8/1

N2 - Dephosphorization by using multiphase flux could considerably decrease the consumption of CaO and prevent the addition of fluorite. However, the equilibrium phase relationship within this system, which is of significant importance for understanding the formation mechanism of multiphase flux, remains unclear. Thus, it is required to provide reliable phase diagrams of the basic slag system of multiphase flux. In this research, the phase relationship of the CaO-SiO 2-FeO-5 mass pct P 2O 5 system at 1673 K (1400 °C) with $${P}-{{{\text{O}}-{2} }}$$ of 9.24 × 10 -11 atm has been studied by using the chemical equilibration method. It has been found that solid solution consists mainly of 2CaO•SiO 2-3CaO•P 2O 5, but occasionally it contains 3CaO•SiO 2. Liquidus saturated with solid solution shrinks toward the FeO corner compared with the isothermal at 1673 K (1400 °C) of the CaO-SiO 2-FeO system equilibrated with metallic iron. Thermodynamically stable CaO-FeO phase is confirmed, which could promote the condensation of 3CaO•P 2O 5 into the solid solution and increase the phosphorus partition ratio between the solid solution and molten slag. Based on the regular solution model, the effect of T.Fe and CaO content in the liquid phase on the phosphorus partition ratio between the solid solution and molten slag is discussed.

AB - Dephosphorization by using multiphase flux could considerably decrease the consumption of CaO and prevent the addition of fluorite. However, the equilibrium phase relationship within this system, which is of significant importance for understanding the formation mechanism of multiphase flux, remains unclear. Thus, it is required to provide reliable phase diagrams of the basic slag system of multiphase flux. In this research, the phase relationship of the CaO-SiO 2-FeO-5 mass pct P 2O 5 system at 1673 K (1400 °C) with $${P}-{{{\text{O}}-{2} }}$$ of 9.24 × 10 -11 atm has been studied by using the chemical equilibration method. It has been found that solid solution consists mainly of 2CaO•SiO 2-3CaO•P 2O 5, but occasionally it contains 3CaO•SiO 2. Liquidus saturated with solid solution shrinks toward the FeO corner compared with the isothermal at 1673 K (1400 °C) of the CaO-SiO 2-FeO system equilibrated with metallic iron. Thermodynamically stable CaO-FeO phase is confirmed, which could promote the condensation of 3CaO•P 2O 5 into the solid solution and increase the phosphorus partition ratio between the solid solution and molten slag. Based on the regular solution model, the effect of T.Fe and CaO content in the liquid phase on the phosphorus partition ratio between the solid solution and molten slag is discussed.

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DO - 10.1007/s11663-012-9651-5

M3 - Article

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VL - 43

SP - 694

EP - 702

JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

SN - 1073-5615

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ER -