Study on Phase Transformation and Desulfurization Ability during Refining with Flux Additions of B2O3 and CaF2 into CaO-Based Desulfurizer

CaF2 aids melting and desulfurization, but can also cause environmental pollution. Thus, it has become important to discuss the phase transformation and find a substitute for CaF2. A CaO-based desulfurizer with various flux additions of B2O3 and CaF2 is investigated during the refining process. The purpose of this study is to discuss the phase transformation and desulfurization ability and during refining with B2O3 and CaF2 using a high frequency furnace. Experimental results indicate that the melting temperature of CaO-Al2O3-SiO2 series desulfurizer becomes lower when more B2O3 and less CaF2 are added. On the other hand, the desulfurization ability can be affected within 15 min when various proportions of B2O3 and CaF2 areadded. The desulfurization ability is better with a high content of B2O3 desulfurizer within a 15 min period. However, the desulfurization ability is not affected by the proportion of B2O3 and CaF2 for a long melting period (30 min).