Thennodynamic study on redox equilibrium of manganese in cao-sio2-mnto-mgosat

Sung Mo Jung, Dong Jun Min, Chang Hee Rhee

Research output: Contribution to journalArticle

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Abstract

Experiments were carried out to determine the ratio of Mn3+Mn2+ at equilibrium in CaO-SiO2-MruO-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 Mn3+Mn2+ ratio increases with slag basicity as well as with MniO content. The solubility of MgO, on the other hand, decreases as the slag basicity increases and also with increasing MruO content. The ratio (%Mn3+) /(%Mn2+) does not change in the oxygen partial pressure between 10-12atm and 10-6atm. At the constant oxygen partial pressure, the value of log(%Mn3') /(%Mn2+) does not change with the slag basicity less than 0. 9. On the other hand, the value of log(%Mn3) /(%Mn2+) decreases with increasing basicity of slag more than 0. 9. Although there is small deviation in the value of log (%Mn3') /(%Mn2+) , the value does not change in the slag composition containing more than 16% MntO. Temperature dependence of the ratio (%Mn3+) /(%Mn2+) at 5. 1×10-9atm in the temperature range of 1350 to 1450t; can be expressed as follows. From the expression, the reaction enthalphy was calculated to be -75kcal/mol. log (%Mn3+) /(%Mn2+) = 1. 64×104/T - 12. 3.

Original languageEnglish
Pages (from-to)916-922
Number of pages7
JournalMaterials Transactions, JIM
Volume37
Issue number4
DOIs
Publication statusPublished - 1996 Jan 1

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slags
Manganese
Slags
manganese
Alkalinity
Partial pressure
partial pressure
Oxygen
oxygen
solubility
Solubility
Magnesium Oxide
Crucibles
Magnesia
crucibles
Oxidation-Reduction
Chemical analysis
Temperature
deviation
temperature dependence

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "Thennodynamic study on redox equilibrium of manganese in cao-sio2-mnto-mgosat",
abstract = "Experiments were carried out to determine the ratio of Mn3+Mn2+ at equilibrium in CaO-SiO2-MruO-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 Mn3+Mn2+ ratio increases with slag basicity as well as with MniO content. The solubility of MgO, on the other hand, decreases as the slag basicity increases and also with increasing MruO content. The ratio ({\%}Mn3+) /({\%}Mn2+) does not change in the oxygen partial pressure between 10-12atm and 10-6atm. At the constant oxygen partial pressure, the value of log({\%}Mn3') /({\%}Mn2+) does not change with the slag basicity less than 0. 9. On the other hand, the value of log({\%}Mn3) /({\%}Mn2+) decreases with increasing basicity of slag more than 0. 9. Although there is small deviation in the value of log ({\%}Mn3') /({\%}Mn2+) , the value does not change in the slag composition containing more than 16{\%} MntO. Temperature dependence of the ratio ({\%}Mn3+) /({\%}Mn2+) at 5. 1×10-9atm in the temperature range of 1350 to 1450t; can be expressed as follows. From the expression, the reaction enthalphy was calculated to be -75kcal/mol. log ({\%}Mn3+) /({\%}Mn2+) = 1. 64×104/T - 12. 3.",
author = "Jung, {Sung Mo} and Min, {Dong Jun} and Rhee, {Chang Hee}",
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Thennodynamic study on redox equilibrium of manganese in cao-sio2-mnto-mgosat. / Jung, Sung Mo; Min, Dong Jun; Rhee, Chang Hee.

In: Materials Transactions, JIM, Vol. 37, No. 4, 01.01.1996, p. 916-922.

Research output: Contribution to journalArticle

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T1 - Thennodynamic study on redox equilibrium of manganese in cao-sio2-mnto-mgosat

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N2 - Experiments were carried out to determine the ratio of Mn3+Mn2+ at equilibrium in CaO-SiO2-MruO-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 Mn3+Mn2+ ratio increases with slag basicity as well as with MniO content. The solubility of MgO, on the other hand, decreases as the slag basicity increases and also with increasing MruO content. The ratio (%Mn3+) /(%Mn2+) does not change in the oxygen partial pressure between 10-12atm and 10-6atm. At the constant oxygen partial pressure, the value of log(%Mn3') /(%Mn2+) does not change with the slag basicity less than 0. 9. On the other hand, the value of log(%Mn3) /(%Mn2+) decreases with increasing basicity of slag more than 0. 9. Although there is small deviation in the value of log (%Mn3') /(%Mn2+) , the value does not change in the slag composition containing more than 16% MntO. Temperature dependence of the ratio (%Mn3+) /(%Mn2+) at 5. 1×10-9atm in the temperature range of 1350 to 1450t; can be expressed as follows. From the expression, the reaction enthalphy was calculated to be -75kcal/mol. log (%Mn3+) /(%Mn2+) = 1. 64×104/T - 12. 3.

AB - Experiments were carried out to determine the ratio of Mn3+Mn2+ at equilibrium in CaO-SiO2-MruO-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 Mn3+Mn2+ ratio increases with slag basicity as well as with MniO content. The solubility of MgO, on the other hand, decreases as the slag basicity increases and also with increasing MruO content. The ratio (%Mn3+) /(%Mn2+) does not change in the oxygen partial pressure between 10-12atm and 10-6atm. At the constant oxygen partial pressure, the value of log(%Mn3') /(%Mn2+) does not change with the slag basicity less than 0. 9. On the other hand, the value of log(%Mn3) /(%Mn2+) decreases with increasing basicity of slag more than 0. 9. Although there is small deviation in the value of log (%Mn3') /(%Mn2+) , the value does not change in the slag composition containing more than 16% MntO. Temperature dependence of the ratio (%Mn3+) /(%Mn2+) at 5. 1×10-9atm in the temperature range of 1350 to 1450t; can be expressed as follows. From the expression, the reaction enthalphy was calculated to be -75kcal/mol. log (%Mn3+) /(%Mn2+) = 1. 64×104/T - 12. 3.

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