Oxidation-Reduction Equilibrium of Manganese in CaO-MntO-SiO2 Slags.

  • Sobandi AHMAD
    Graduate Student, Division of Chemical and Materials Engineering, Muroran Institute of Technology
  • Katayama Hiroshi G.
    Department of Materials Science and Engineering, Muroran Institute of Technology
  • Momono Tadashi
    Department of Materials Science and Engineering, Muroran Institute of Technology

Search this article

Abstract

The oxidation-reduction equilibrium of manganese in the CaO-MntO-SiO2(-MgO-Al2O3) 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 (%Mn3+)/(%Mn2+) ratio was determined and expressed by the following equation:<br><br>log(%Mn3+)/(%Mn2+)=0.86{(%CaO)+(%MgO)+0.436(%MntO)+0.126 (%Al2O3)}/(%SiO2)+0.22 logPO<sub>2</sub>(Pa)+2860/T-4.44<br><br> The value of standard enthalpy change for the oxidation of Mn2+ to Mn3+ was determined to be -55 kJ/mol. The manganite capacity, CMnO<sub>x</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.

Journal

  • ISIJ International

    ISIJ International 38 (1), 9-15, 1998

    The Iron and Steel Institute of Japan

Citations (1)*help

See more

References(10)*help

See more

Details

Report a problem

Back to top