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The correlations between the sulphide capacity and the optical basicity models available in literature are reviewed. The relationship between sulphide capacity and the optical basicity was investigated on plant data collected from the BOF plant in the temperature range of 1565– 1650◦C. The goal of this work was to compare results given by applying common acceptable Young’s, Sosinsky-Sommerville’s, Tsao-Katayama’s and Taniguchi’s optical basicity as well as the KTH model for calculating the sulphide capacities. The present paper is focused on the thermodynamic aspect of sulphur refining CaO-Al2O3-SiO2-MgO ladle slag during LF ladle treatment. Thirty one heats were employed in the present study in real production conditions of low carbon steels. K e y w o r d s: steels, thermodynamics, analytical methods, optical basicity, sulphide capacity

Relationship between the common optical basicity models and the sulphide capacities of CaO-Al2O3-SiO2-MgO slag