Comprehensive Desulfurization and Dealkalization Capacity of Blast Furnace Slag

In order to reflect the ability of comprehensive dealkalization and desulfurization of BF slag more accurately, the K2S capacity was proposed. The effects of w(CaO)/w(SiO2), w(MgO) and w(Al2O3) on the ability of comprehensive dealkalization and desulfurization were studied at 1773 K using gas-slag equilibrium techniques. The results showed that with an increase of w(CaO)/w(SiO2), the comprehensive desulfurization and dealkalization capacity of BF slag increases firstly and then decreases. When w(CaO)/w(SiO2) is 1.0, the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} reaches the maximum value. As w(MgO) increases with w(CaO)/w(SiO2) constant, the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} of BF slag increases firstly and then decreases. When w(MgO) is 10.58%, the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} reaches the maximum value. As w(MgO) increases with [w(CaO) + w(MgO)]/w(SiO2) constant, the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} of BF slag decreases. The use of MgO instead of CaO can deteriorate the comprehensive desulfurization and dealkalization capacity. With an increase of w(Al2O3), the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} of BF slag increases firstly and then decreases. When w(Al2O3) is 15.1%, the CK2S\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{C}}_{{{\text{K}}_{ 2} {\text{S}}}}$$\end{document} reaches the maximum value. It is suggested that w(CaO)/w(SiO2) remains at about 1.0 in blast furnace production, w(MgO) is maintained at about 10.58%, and w(Al2O3) is maintained at about 15.1%.