SOCHA Ladislav VSB - Technical University of Ostrava

Spoluautoři MICHALEK Karel, HUDZIECZEK Zbyněk, PILKA Václav, PIEGZA Zbygněv

Steel treatment in the ladle in the secondary metallurgy units can be described as refining processes taking place between two non-mixable liquids representing metal and slag, namely under relative high temperatures. During refining processes, transmission process appears between metal and slag which has an impact on increasing of micro-cleanness and mainly on steel desulphurization representing an important transfer process. Mentioned paper deals with verification of the results of desulphurization course of steel obtained by the model study in the physical model of the ladle with the help of plant experiments in the homogenization station (HS) with the inert gas. The homogenization station seems to be appropriate for the study of desulphurization because its primal aim is intensive homogenization of steel under the slag which has got a weak desulphurization effect. However, conditions during the whole experiment are constant because both chemical composition and slag temperature don't significantly change during the course of the whole process. Proper plant experiments were made in the 180 t ladle which served as a pattern for creation of the physical model in the geometric scale 1 : 9. The plant experiment was based on the methodology used at the physical modelling which consists in regular taking of metal and slag samples for evaluation of kinetics of the loss of sulphur in metal and the appropriate increase of sulphur content in slag. The goal of this paper was to obtain relevant information about transfer processes taking place in the interface slag – metal and to assess the rate and course of steel desulphurization in the physical model and in the ladle at the homogenization station.

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