CAS-OB REFINING LADLE SLAG MODIFYING WITH CaO-CaF_2

摘要

Evaluation of CAS-OB refining slags showed that the melting temperature and viscosity were very high and could further increase during the CAS-OB refining process, causing excessive slag to stick to the snorkel with resulting operational problems. To avoid this, CaO-CaF2 (mass ratio 1:1) was employed as modifier of the CAS-OB refining ladle slag. The temperature and the viscosity of the slag could be lowered consecutively with the increasing of addition level of modifier. The melting temperature of the unmodified ladle slag is 1439?C. When adding 20% CaO-CaF2, the melting temperature is decreased to 1327 ?C. At 1500 ?C, the viscosity of the unmodified ladle slag is 6.5Pa·s, which can be decreased lower than 2Pa·s by adding more than 5% CaO-CaF2. The results of experiments on sulfur partition equilibrium between metal and modified slag indicates that the desulfurizing capacity of the slag can be enhanced by adding CaO-CaF2.