In the present investigation, the effect of CaO–Al2O3-based synthetic slag additions on steel desulphurisation has been studied on industrial scale. The dependency of sulphide capacity (CS\documentclass[12pt]{minimal}
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\begin{document}$$C_{\text{S}}$$\end{document}), sulphur distribution ratio (LS\documentclass[12pt]{minimal}
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\begin{document}$$L_{\text{S}}$$\end{document}) and desulphurisation efficiency on various physicochemical properties of ladle furnace slag was studied and presented for both Si/Mn-killed and Si/Mn/Al-killed processes. A kinetic model of steel desulphurisation was developed to predict the volumetric mass transfer coefficient of sulphur (KS·a\documentclass[12pt]{minimal}
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\begin{document}$$K_{\text{S}} \cdot a$$\end{document}) in slag phase from plant trials. From the results, it was observed that (FeO + MnO) in slag, Al2O3/CaO ratio, optical basicity, viscosity of slag and sulphide capacity played an important role in steel desulphurisation. The results suggested suitable operating parameters under different conditions to improve desulphurisation.
