A thermodynamic model for predicting sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 -}}} $$\end{document} of CaO-FeO-Fe2O3-Al2O3-P2O5 slags in a large variation range of oxygen potential pO2\documentclass[12pt]{minimal}
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\begin{document}$$ p_{{{\text{O}}_{ 2}}} $$\end{document} corresponding to mass percentage of FetO from 1.88 to 55.50 pct, i.e., IMCT-CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 -}}} $$\end{document} model, has been developed by coupling with the deduced desulfurization mechanism of the slags based on the ion and molecule coexistence theory (IMCT). The developed IMCT-CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 -}}} $$\end{document} model has been verified through comparing the determined sulfide capacity CS2-,determined\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{ 2-} , {\text{ determined}}}} $$\end{document} after Ban-ya et al.[20] with the calculated CS2-,calculatedIMCT\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{ 2-} , {\text{ calculated}}}}^{\text{IMCT}} $$\end{document} by the developed IMCT-CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 -}}} $$\end{document} model and the calculated CS2-,calculatedi\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{ 2-} , {\text{ calculated}}}}^{i} $$\end{document} by the reported sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 -}}} $$\end{document} models such as the KTH model. Mass percentage of FetO as 6.75 pct corresponding to the mass action concentration NFetO\documentclass[12pt]{minimal}
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\begin{document}$$ N_{{{\text{Fe}}_{t} {\text{O}}}} $$\end{document} of FetO as 0.0637 or oxygen partial pO2\documentclass[12pt]{minimal}
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\begin{document}$$ p_{{{\text{O}}_{2} }} $$\end{document} as 2.27 × 10−6 Pa is the criterion for distinguishing reducing and oxidizing zones for the slags. Sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 - } }} $$\end{document} of the slags in reducing zone is controlled by reaction ability of CaO regardless of slag oxidization ability. However, sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 - } }} $$\end{document} of the slags in oxidizing zone shows an obvious increase tendency with the increasing of slag oxidization ability. Sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 - } }} $$\end{document} of the slags in reducing zone keeps almost constant with variation of the simplified complex basicity (pct CaO)/((pct Al2O3) + (pct P2O5)), or optical basicity, or the mass action concentration ratios of NFeO/NCaO, NFe2O3/NCaO\documentclass[12pt]{minimal}
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\begin{document}$$ N_{{{\text{Fe}}_{ 2} {\text{O}}_{ 3} }} /N_{\text{CaO}} $$\end{document}, NFeO·Fe2O3/NCaO\documentclass[12pt]{minimal}
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\begin{document}$$ N_{{{\text{FeO}} \cdot {\text{Fe}}_{2} {\text{O}}_{3} }} /N_{\text{CaO}} $$\end{document}, and NFetO/NCaO\documentclass[12pt]{minimal}
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\begin{document}$$ N_{{{\text{Fe}}_{t} {\text{O}}}} /N_{\text{CaO}} $$\end{document}. Sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 - } }} $$\end{document} of the slags in oxidizing zone shows an obvious increase with the increasing of the simplified complex basicity (pct CaO)/((pct Al2O3) + (pct P2O5)) or optical basicity, or the aforementioned mass action concentration ratios. Thus, the aforementioned mass action concentration ratios and the corresponding mass percentage ratios of various iron oxides to basic oxide CaO are recommended to represent the comprehensive effect of various iron oxides and basic oxide CaO on sulfide capacity CS2-\documentclass[12pt]{minimal}
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\begin{document}$$ C_{{{\text{S}}^{2 - } }} $$\end{document} of the slags.