Abstract
The molar sulphide capacities \( C_{\text{S}}^{'} \) = (mol pct S) (\( P_{{{\text{O}}_{2} }} /P_{{{\text{S}}_{2} }} \))1/2 on four binary systems, MgO-SiO2, CaO-SiO2, MnO-SiO2 and FeO-SiO2 are elucidated so as to compare the magnitudes of the basicities of four metallic oxides and to estimate the temperature dependencies of the basicities of metallic oxides. The enthalpy changes of the reaction 2O− = O + O2−, viz. the silicate polymerization reaction (denoted as \( \Updelta H_{(8)}^{^\circ } \)) have been calculated from the slopes of the log \( C_{\text{S}}^{'} \) vs 1/T curves for four binary silicates. The \( \Updelta H_{(8)}^{^\circ } \) value is considered in the present work to be an index of the basicity of silicate melts. The basicities obtained on the basis of the \( \Updelta H_{(8)}^{^\circ } \) values are in the order MgO < CaO < MnO < FeO, which are determined by two effects; (i) ionicity of chemical bonds between metallic and oxygen ions and (ii) clustering of metallic oxides in silicates. It is also found that the basicity of the FeO-SiO2 system is larger at higher temperatures.
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Acknowledgments
The authors are thankful to the Swedish Steel Producers Association and National Natural Science Foundation of China (No. 51104013), China Postdoctoral Science special Foundation (No. 201004056) for the financial support in carrying out this work. The authors are also thankful to Dr. Lidong Teng for valuable discussions.
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Manuscript submitted October 20, 2011.
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Wang, Lj., Hayashi, M., Chou, Kc. et al. An Insight into Slag Structure from Sulphide Capacities. Metall Mater Trans B 43, 1338–1343 (2012). https://doi.org/10.1007/s11663-012-9713-8
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DOI: https://doi.org/10.1007/s11663-012-9713-8