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

Authors:

Hiroyasu Fujiwara Eiji Ichise Masahiro Kitou Takayuki Matsui

Affiliation:

(1) Present address: the Graduate School of Energy Science, Kyoto University, 606-8501 Kyoto, Japan;(2) Present address: Graduate School of Energy Science, Kyoto University, Japan;(3) Nagoya Works, Nippon Steel Corporation, 476 Tokai, Japan;(4) Chiba Works, Kawasaki Steel Corporation, 260 Chiba, Japan

Abstract:

In order to determine the ferrous and ferric ion capacities: 3

$C_{Fe^{2 + } } = frac{{(pct Fe^{2 + } )}}{{alpha _{Fe} }}p_{{text{O}}_{text{2}} }^{ - 1/2} and C_{Fe^{3 + } } = frac{{(pct Fe^{3 + } )}}{{alpha _{Fe} }}p_{{text{O}}_{text{2}} }^{ - 3/4}$

for an MgO-saturated MgO + CaO + Al₂O₃ slag, two experiments were carried out at 1873 K: (1) the distribution of iron between Fe_xO dilute slags of the system and Pt + Fe alloys under controlled atmosphere, and (2) the equilibrium among molten iron or iron alloys, magnesiowustite, and molten slags. Although the activity of iron and the partial pressure of oxygen in each experiment are remarkably different, the values of the ferrous and ferric ion capacities agree well with each other. The influence of the MgO:CaO:Al₂O₃ ratio on the values of $C_{Fe^{2 + } }$ and $C_{Fe^{3 + } }$ was found to be limited within the experimental composition range. Using $C_{Fe^{2 + } }$ and $C_{Fe^{3 + } }$ , the relationship between total iron content, (pct Fe^T), and partial pressure of oxygen, $p_{O_2 }$ , under iron saturation was calculated. The change in log $p_{O_2 }$ with respect to the bulk slag composition is less than 0.2 within the range of (pct Fe^T) < 5.

Keywords:

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