Oxidation-Reduction Equilibrium of Manganese in CaO-Mn_tO-SiO_2 Slags

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著者

    • SOBANDI Ahmad
    • Division of Chemical and Materials Engineering, Muroran Institute of Technology
    • KATAYAMA Hiroshi G.
    • Division of Chemical and Materials Engineering, Muroran Institute of Technology, Department of Materials Science and Engineering, Muroran Institute of Technology
    • MOMONO Tadashi
    • Division of Chemical and Materials Engineering, Muroran Institute of Technology, Department of Materials Science and Engineering, Muroran Institute of Technology

抄録

The oxidation-reduction equilibrium of manganese in the CaO-Mn<sub>t</sub>O-SiO<sub>2</sub>(-MgO-Al<sub>2</sub>O<sub>3</sub>) slag system has been investigated as functions of slag composition, oxygen partial pressure and temperature. <br> In the range of oxygen partial pressure of 3.04 to 21.28 kPa and temperature of 1573 to 1673 K, the (%Mn<sup>3+</sup>)/(%Mn<sup>2+</sup>) ratio was determined and expressed by the following equation:<br><br>log(%Mn<sup>3+</sup>)/(%Mn<sup>2+</sup>)=0.86{(%CaO)+(%MgO)+0.436(%Mn<sub>t</sub>O)+0.126 (%Al<sub>2</sub>O<sub>3</sub>)}/(%SiO<sub>2</sub>)+0.22 log<I>P</I><sub>O<sub>2</sub></sub>(Pa)+2860/<I>T</I>-4.44<br><br> The value of standard enthalpy change for the oxidation of Mn<sup>2+</sup> to Mn<sup>3+</sup> was determined to be -55 kJ/mol. The manganite capacity, <I>C</I><sub>MnO<sub><I>x</I></sub></sub>, has also been arranged as a function of slag composition and temperature. Furthermore, on the basis of the present experimental data, the values of optical basicity of component oxides were estimated and compared with those reported by the other investigators.

収録刊行物

  • ISIJ international  

    ISIJ international 38(1), 9-15, 1998-01-15 

    The Iron and Steel Institute of Japan

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