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}
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\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}
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\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}
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\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}
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\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}
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\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}
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\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%.
