Sulfide Capacity of CaO–SiO2–MnO–Al2O3–MgO Slags at 1873 K
スポンサーリンク
概要
- 論文の詳細を見る
The sulfide capacities of the CaO–SiO2–MnO–Al2O3–5 mass% MgO slags were measured at 1873 K over a wide composition range using a gas–slag equilibration method. The effects of basicity and the activity coefficient of sulfide on the sulfide capacity of molten slag were also investigated based on the structural view of silicate melts. In the multicomponent silicate melts containing high MnO (up to about 50 mass%), the sulfide capacity mainly increased with increasing MnO content. The capacity and modified Vee ratio, i.e. (CaO+MnO+MgO)/ (SiO2+Al2O3), showed a good linear relationship. Assuming that the basicity and the stability of sulfide ions in the slag are proportional to the activity of basic oxides and the activity coefficient of sulfides, the composition dependency of the sulfide capacity is well described by changes in the aMO to γMS (M=Ca, Mn) ratio. The substitution of silica by alumina did not affect the sulfide capacity of the slags not only because of an increase in the activity of basic oxides but also because of a decrease in the stability of sulfides as Al2O3/SiO2 ratio increased. In the high silica melts of which silica content greater than about 30 mass%, the sulfide capacity increased with increasing MnO/CaO ratio, whereas it decreased by increasing the MnO/CaO ratio in the low silica melts (< about 30 mass%). This tendency of sulfide capacity resulted in the clock-wisely rotating iso-capacity contours in the CaO–SiO2–MnO–Al2O3–MgO system at 1873 K. The dissolution mechanism of sulfur in the MnO–containing calcium silicate melts can be explained not only by the difference in the structural role of Ca2+ and Mn2+ ions but also by the changes in the content of O2– ions according to the silica content.
著者
-
Park Geun-ho
School Of Materials Science And Engineering University Of Ulsan
-
Park Joo
School Of Materials Sci. And Engineering Univ. Of Ulsan
関連論文
- Phosphate Capacity of CaO-SiO_2-MnO-FeO Slag Saturated with MgO
- Hot Metal Desulfurization by CaO-SiO_2-CaF_2-Na_2O Slag Saturated with MgO
- Thermodynamics of Copper Dissolution into MnO-SiO_2-MnS Inclusion System
- Thermodynamics of Titanium Oxide in CaO-SiO_2-Al_2O_3-MgO_-CaF_2 Slag Equilibrated with Fe-11mass%Cr Melt
- Discussion on "The Estimation of the Iso-viscosity Lines in Molten CaF_2-CaO-SiO_2 System"
- Electrochemical Method for Controlling the Interfacial Oxygen in Molten Fe with ZrO_2 Based Solid Electrolyte
- Control of MgO・Al_2O_3 Spinel Inclusions in Stainless Steels
- Carbide Capacity of CaO-SiO_2-MnO Slag for the Production of Manganese Alloys
- Sulfide Capacity of the CaO-SiO_2-MnO Slag at 1873K
- Structure–Property Correlations of CaO–SiO2–MnO Slag Derived from Raman Spectroscopy
- Sulfide Capacity of CaO–SiO2–MnO–Al2O3–MgO Slags at 1873 K
- Density Measurements of CaO–MnO–SiO2 Slags
- Sulfide Capacity and Excess Free Energy of CaO–SiO2–MnO Slag Derived from Structural Analysis of Raman Spectra
- Structure-Property Correlations of CaO-SiO_2-MnO Slag Derived from Raman Spectroscopy