Abstract
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.

Key words
steels, thermodynamics, analytical methods, optical basicity, sulphide capacity

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