Activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution

Mitsutaka Hino; Ken ichi Higuchi; Tetsuya Nagasaka; Shiro Ban-Ya

Activities of constituents in FeO·Cr₂O₃-MgO·Cr₂O₃ spinel solid solution

Mitsutaka Hino, Ken ichi Higuchi, Tetsuya Nagasaka, Shiro Ban-Ya

New Industry Creation Hatchery Center (NICHe)

Tohoku University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The activity of iron chromite in solid FeO·Cr₂O₃-MgO·Cr₂O₃ spinel, saturated with Cr₂O₃, was determined at 1573 K, by the equilibrium measurement of iron dissolved in liquid silver held in the spinel crucible with CO-CO₂ gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The solubility of Cr₂O₃ in FeO·Cr₂O₃-MgO·Cr₂O₃ spinel phase was found to be negligibly small. The free energy of formation of FeO·Cr₂O₃, was determined as follows: Fe(s)+ 1/2 O₂(g)+Cr₂O₃(s) = FeO·Cr₂O₃(s), ΔG° = -307600+66.82 T (J/mol). (1423-1723 K) The activities of constituents in FeO·Cr₂O₃-MgO·Cr₂O₃ spinel solid solution coexisted with Cr₂O₃ showed negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of FeO·Cr₂O₃-MgO·Cr₂O₃ system was determined as follows; α_{FeO·Cr(2)O(3)} = RTInγ_{FeO·Cr(2)O(3)} (1-N_{FeO·Cr(2)O(3)})² = α_{MgO·Cr(2)O(3)} = RTInγ_{MgO·Cr(2)O(3)}/ (1-N_{MgO·Cr(2)O(3)})² = -12800 (J).

Original language	English
Pages (from-to)	9-14
Number of pages	6
Journal	Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume	80
Issue number	7
Publication status	Published - 1994 Jul

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@article{b32ad56f040f496b94c12990c4af6ecb,

title = "Activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution",

abstract = "The activity of iron chromite in solid FeO·Cr2O3-MgO·Cr2O3 spinel, saturated with Cr2O3, was determined at 1573 K, by the equilibrium measurement of iron dissolved in liquid silver held in the spinel crucible with CO-CO2 gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The solubility of Cr2O3 in FeO·Cr2O3-MgO·Cr2O3 spinel phase was found to be negligibly small. The free energy of formation of FeO·Cr2O3, was determined as follows: Fe(s)+ 1/2 O2(g)+Cr2O3(s) = FeO·Cr2O3(s), ΔG° = -307600+66.82 T (J/mol). (1423-1723 K) The activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution coexisted with Cr2O3 showed negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of FeO·Cr2O3-MgO·Cr2O3 system was determined as follows; αFeO·Cr(2)O(3) = RTInγFeO·Cr(2)O(3) (1-NFeO·Cr(2)O(3))2 = αMgO·Cr(2)O(3) = RTInγMgO·Cr(2)O(3)/ (1-NMgO·Cr(2)O(3))2 = -12800 (J).",

author = "Mitsutaka Hino and Higuchi, {Ken ichi} and Tetsuya Nagasaka and Shiro Ban-Ya",

year = "1994",

month = jul,

language = "English",

volume = "80",

pages = "9--14",

journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",

issn = "0021-1575",

publisher = "Iron and Steel Institute of Japan",

number = "7",

}

TY - JOUR

T1 - Activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution

AU - Hino, Mitsutaka

AU - Higuchi, Ken ichi

AU - Nagasaka, Tetsuya

AU - Ban-Ya, Shiro

PY - 1994/7

Y1 - 1994/7

N2 - The activity of iron chromite in solid FeO·Cr2O3-MgO·Cr2O3 spinel, saturated with Cr2O3, was determined at 1573 K, by the equilibrium measurement of iron dissolved in liquid silver held in the spinel crucible with CO-CO2 gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The solubility of Cr2O3 in FeO·Cr2O3-MgO·Cr2O3 spinel phase was found to be negligibly small. The free energy of formation of FeO·Cr2O3, was determined as follows: Fe(s)+ 1/2 O2(g)+Cr2O3(s) = FeO·Cr2O3(s), ΔG° = -307600+66.82 T (J/mol). (1423-1723 K) The activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution coexisted with Cr2O3 showed negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of FeO·Cr2O3-MgO·Cr2O3 system was determined as follows; αFeO·Cr(2)O(3) = RTInγFeO·Cr(2)O(3) (1-NFeO·Cr(2)O(3))2 = αMgO·Cr(2)O(3) = RTInγMgO·Cr(2)O(3)/ (1-NMgO·Cr(2)O(3))2 = -12800 (J).

AB - The activity of iron chromite in solid FeO·Cr2O3-MgO·Cr2O3 spinel, saturated with Cr2O3, was determined at 1573 K, by the equilibrium measurement of iron dissolved in liquid silver held in the spinel crucible with CO-CO2 gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The solubility of Cr2O3 in FeO·Cr2O3-MgO·Cr2O3 spinel phase was found to be negligibly small. The free energy of formation of FeO·Cr2O3, was determined as follows: Fe(s)+ 1/2 O2(g)+Cr2O3(s) = FeO·Cr2O3(s), ΔG° = -307600+66.82 T (J/mol). (1423-1723 K) The activities of constituents in FeO·Cr2O3-MgO·Cr2O3 spinel solid solution coexisted with Cr2O3 showed negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of FeO·Cr2O3-MgO·Cr2O3 system was determined as follows; αFeO·Cr(2)O(3) = RTInγFeO·Cr(2)O(3) (1-NFeO·Cr(2)O(3))2 = αMgO·Cr(2)O(3) = RTInγMgO·Cr(2)O(3)/ (1-NMgO·Cr(2)O(3))2 = -12800 (J).

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M3 - Article

AN - SCOPUS:0028468486

SN - 0021-1575

VL - 80

SP - 9

EP - 14

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

IS - 7

ER -

Activities of constituents in FeO·Cr₂O₃-MgO·Cr₂O₃ spinel solid solution

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