The distribution of manganese and sulfur between CaOsat-SiO2-FetO-MgOsat slags and molten iron

S. M. Jung, C. H. Rhee, D. J. Min, K. Morita, N. Sano

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Abstract

In the present study, the equilibria of manganese and sulfur between CaOsat-SiO2-FetO-MgOsat and molten iron were studied in the temperature range of 1,550 to 1,650°C. The decrease of CaO solubility by the addition of MnO was compensated by increasing MgO solubility. The addition of MgO to CaOsat-SiO2-FetO slag slightly increased the activity coefficients of FetO and MnO, and the properties of SiO2 as an acidic oxide were clarified in this slag system. The oxygen content of metal in equilibrium with (37.5 to 41.1 mass percent) CaO-(5.5 to 6.6 mass percent) SiO2-(41.6 to 43.7 mass percent) FetO-(5.9 to 8.3 mass percent) MgO slags doubly saturated with CaO and MgO is expressed by the following equation: log[mass%O]=-5680/T + 1.87 The addition of MgO to CaOsat-SiO2-FetO slag also increased the sulfide capacity of the slag. The approximate validity of the regular solution model was examined to formulate the thermodynamic properties of complex slags containing MnO.

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalIron and Steelmaker (I and SM)
Volume28
Issue number5
Publication statusPublished - 2001 May

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

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