Effect of Mineral Materials on Crystallization Phases in Flux Film

Due to the frequent surface defect happened to the peritectic steel slab, the effects of raw mineral materials on the properties and crystallization characteristics of mold flux were investigated using process mineralogy in this study. Mold flux were mainly prepared using cement clinker and industrial mineral materials under laboratory conditions, the crystallization phases of the flux film were systematically i-dentified and quantitatively analyzed. According to the analysis, the crystallization ratio of all the flux films reached more than 55% with additional mineral materials, and the main phases of the flux films are wollastonite and cuspidine. As the quartz(6%~24%) or wollastonite(11%~19%) addition increasing,viscosity and heat flow density of flux film increase, which facilitate the growth of wollastonite in the flux film. Whereas, with increasing fluorite(8%~16%) or soda ash(10%~18%), the viscosity of flux film decreases, which promote the cuspidine content increase and thus heat transfer of flux film. When the quartz and wollastonite addition exceeded, it will lead to a large number of wollastonite and few cuspidine, the excessive fluorite and soda ash addition will lead to mass cuspidine and few wollastonite.