Thermodynamic Study on Redox Equilibrium of Manganese in CaO-SiO_2-Mn_tO-MgO_<sat>

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著者

    • JUNG Sung-Mo
    • Department of Materials Science and Engineering, Pohang University of Science and Technology
    • MIN Dong-Jun
    • Department of Materials Science and Engineering, Pohang University of Science and Technology
    • RHEE Chang-Hee
    • Department of Materials Science and Engineering, Pohang University of Science and Technology

抄録

Experiments were carried out to determine the ratio of Mn<SUP>3+</SUP>/Mn<SUP>2+</SUP> at equilibrium in CaO–SiO<SUB>2</SUB>–Mn<SUB>t</SUB>O–MgO slag under various slag compositions and oxygen partial pressures in temperature range of 1350∼1450°C. As magnesia crucibles were used, the solubility limit of MgO could also be determined. Results indicate that the Mn<SUP>3+</SUP>/Mn<SUP>2+</SUP> ratio increases with slag basicity as well as with Mn<SUB>t</SUB>O content. The solubility of MgO, on the other hand, decreases as the slag basicity increases and also with increasing Mn<SUB>t</SUB>O content. The ratio (%Mn<SUP>3+</SUP>)/(%Mn<SUP>2+</SUP>) does not change in the oxygen partial pressure between 10<SUP>−12</SUP>atm and 10<SUP>−6</SUP>atm. At the constant oxygen partial pressure, the value of log(%Mn<SUP>3+</SUP>)/(%Mn<SUP>2+</SUP>) does not change with the slag basicity less than 0.9. On the other hand, the value of log(%Mn<SUP>3+</SUP>)/(%Mn<SUP>2+</SUP>) decreases with increasing basicity of slag more than 0.9. Although there is small deviation in the value of log(%Mn<SUP>3+</SUP>)/(%Mn<SUP>2+</SUP>), the value does not change in the slag composition containing more than 16% Mn<SUB>t</SUB>O. Temperature dependence of the ratio (%Mn<SUP>3+</SUP>)/(%Mn<SUP>2+</SUP>) at 5.1×10<SUP>−9</SUP>atm in the temperature range of 1350 to 1450°C can be expressed as follows. From the expression, the reaction enthalphy was calculated to be −75kcal/mol.<BR>(<U>Remark: Graphics omitted.</U>)

収録刊行物

  • Materials transactions, JIM  

    Materials transactions, JIM 37(4), 916-922, 1996-04 

    The Japan Institute of Metals

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