The efficiency at industrial scale of a thermodynamic model for desulphurization of aluminium killed steels using slags in the system CaO-MgO-Al2O3-SiO2.
DOI:
https://doi.org/10.3989/revmetalm.0849Keywords:
Desulfuración, Escoria, Modelo termodinámico, Capacidad de captación de azufre, ReoxidaciónAbstract
In this paper are presented the results of some desulphurization trials in the ladle carried out at industrial scale for steels with low carbon, low alloyed and aluminum killed, using basic slag and argon bubbling. The main variables of treatment have been established on the basis of a thermodynamic model that includes parameters as sulphur capacity of the slag, optical basicity of oxides and of the slags, the activities of oxides in the slags and activities of elements in the liquid steel. Sulphur contents at the end of treatment, are close to the values predicted by the model. Low sulfur levels achieved in the process, facilitate the subsequent treatment with calcium to modify the inclusions. Finally an evaluation is presented concerning the effects resulting from the reoxidation of the melt on the main indicators, showing the efficiency of the applied treatment for desulphurization.
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