About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics for Sustainability: An EPD Symposium in Honor of Kazuki Morita
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| Presentation Title |
Thermodynamic Properties of MnO in the CaO-MnO-SiO<sub>2</sub> Ferromanganese Slags |
| Author(s) |
Tomoyuki Yamada, Keijiro Saito, Hisao Kimura, Kazuki Morita |
| On-Site Speaker (Planned) |
Tomoyuki Yamada |
| Abstract Scope |
The thermodynamic properties of MnO in slags are essential to improve manganese yield and to reduce CO<sub>2</sub> emissions in ferromanganese production. In this study, the thermodynamic properties of MnO in the CaO-MnO-SiO<sub>2</sub> ternary slags, which are the basis of ferromanganese slags, were investigated at 1673 K. Two types of equilibrium experiments (pure solid MnO/Cu and slags/Cu) were conducted simultaneously in molybdenum crucibles under a CO-CO<sub>2</sub> atmosphere at 1673 K. The activity and activity coefficient of MnO in slags (<i>a</i><sub>MnO(s)</sub> and <i>γ</i><sub>MnO(s)</sub>, respectively) were derived together with the activity coefficient of Mn in liquid Cu(<i>γ</i><sup>°</sup><sub>Mn(l)</sub>) where (s) and (l) denote standard states. The obtained <i>γ</i><sup>°</sup><sub>Mn(l)</sub> value at infinite dilution (= 0.344 ± 0.020) was consistent with literature data, confirming the experimental validity. From the iso-<i>a</i><sub>MnO(s)</sub> curves drawn in the homogeneous liquid region, it was found that <i>γ</i><sub>MnO(s)</sub> increased with increasing CaO/SiO<sub>2</sub> ratio, indicating the fundamental behavior of MnO in the slags. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Pyrometallurgy, |