1993 Volume 33 Issue 1 Pages 88-97
The necessity to minimize the slag volume, to adjust the phosphorus content in the steel as low as possible and to utilize the converter slag, as far as possible, also for desulphurization requires an efficient slagging practice. This paper presents results of investigations on solidified converter and laboratory slags obtained with the microanalyzer. The factor responsible for the binding of phosphorus in converter slags is the formation of dicalcium silicate, whereas for the binding of sulphur it is dicalcium ferrite.
In slags from laboratory melts with an SiO2-content below 1 wt% phosphorus is detected in a separate calcium phosphate phase. The negative effects on metallurgical results caused by higher contents of MgO and Al2O3 in converter slags are described on the basis of an interpretation of evaluations from large-scale tests. The sequence of dephosphorization and desulphurization in the converter process is discussed with the aid of the ionic theory of slags.
