Thermodynamics of iron oxide in Fe x O-dilute CaO+Al2O3+Fe x O fluxes at 1873 K期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Thermodynamics of iron oxide in Fe x O-dilute CaO+Al2O3+Fe x O fluxes at 1873 K

Authors:

Hiroyasu Fujiwara Eiji Ichise Masahiro Kitou Takayuki Matsui

Affiliation:

(1) Present address: the Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, 606-01 Kyoto, Japan;(2) Nagoya Works, Nippon Steel Corporation, 476 Tokai, Japan;(3) Chiba Works, Kawasaki Steel Corporation, 260 Chiba, Japan

Abstract:

The distribution of iron between Fe_xO-dilute CaO+Al₂O₃+Fe_xO fluxes and Pt+Fe alloys, as well as the redox equilibrium of iron ions in these fluxes, was experimentally investigated in pressure-controlled CO₂/CO gas at 1873 K. Total iron content in flux (pct Fe^T) and the ratio of (pct Fe²⁺) to (pct Fe^T) in fluxes with constant $X_{CaO} /X_{Al_2 O_3 }$ can be related to the activity of iron, α _Fe, and the partial pressure of oxygen, a _Fe, using the following equation:

$begin{gathered} (pct Fe^T ) = { (C_{Fe^{2 + } } )p_{O_2 } ^{1/2} + (C_{Fe^{3 + } } )p_{O_2 } ^{3/4} )} a_{Fe} hfill frac{{(pct Fe^{2 + } )}}{{pct Fe^T }} = frac{1}{{1 + { (C_{Fe^{3 + } } )/(C_{Fe^{2 + } } )} times p_{O_2 } ^{1/4} }} hfill end{gathered}$

where $C_{Fe^{2 + } }$ and $C_{Fe^{3 + } }$ are the ferrous and ferric ion capacities, respectively, defined as

$C_{Fe^{2 + } } = frac{{(pct Fe^{2 + } )}}{{a_{Fe} }}p_{O_2 } ^{ - 1/2} ,C_{Fe^{3 + } } = frac{{(pct Fe^{3 + } )}}{{a_{Fe} }}p_{O_2 } ^{ - 3/4}$

The present article applies these parameters to the evaluation of the activity coefficient of Fe_xO at infinite dilution, γ _Fex ^O/o , relative to the liquid iron oxide in equilibrium with iron. Furthermore, the composition dependence of γ _Fex ^O/o is discussed.

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