Abstract
The technical feasibility of the simultaneous desulfurization and dephosphorization process of hot metal with high basicity slags of the BaO-BaF 2 system is discussed from the thermodynamic point of view. The, partition ratios as well as the degrees of removal of sulphur and phosphorus from the hot metal obtained after a single refining step with BaO-saturated slags have been compared to those achieved when typical hot metal pretreatment slags of the system CaO-CaF 2 -SiO 2 (double saturated with CaO and 3CaO.SiO 2 ) were used. The experiments were carried out in graphite crucibles at 1573 K, under CO atmosphere. Considering that both the desulfurization degree and the dephosphorization degree of hot metal achieved with BaO-based slags, around 95 %, were much higher than those obtained when CaO-based slags were used, maximum 45 %, it was concluded that the simultaneous desulfurization and dephosphorization process of hot metal with high basicity BaO-BaF 2 slags is technically feasible. It has been verified also that the high basicity BaO-based slags led to manganese recovery degrees as high as 86 % and prevented at the same time the undesirable oxidation of carbon from the metal phase.
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