1985 Volume 71 Issue 11 Pages 1504-1509
As a means of utilization of BOF slags, their usability to hot metal treatments in removing phosphorus and sulfur and in recovering manganese and iron was examined.
In order to avoid the melting point rise due to a decrease in FeO content in the slag, 10 to 40% CaCl2 or CaF2 was added to the slag and it was reacted with the hot metal of 50 g or 4 kg containing 0.1 % P, 0.05% S and 5% C at 1 350°C. The ratio of slag to metal in weight was 1: 10.
While for desulfurization there was no difference in the effect of slag composition, most effective slag for dephosphorization was the one with 20% addition of CaF2 which achieved 90% degree of dephosphorization and desulfurization in 20 min. Iron and manganese in the slag was recovered by 85-89% and 93-97%, respectively.
Thus, it was indicated that BOF slags, which are considered as industrial waste can be effectively utilized in hot metal treatments.