Influence of F^- on Heat Transfer of Mold Flux and Mineralogical Structure of Flux Film

During continuous casting,the mineralogical structure of flux film and heat transfer of mold flux play important roles in strand quality.In this paper,the thermal conductivity and mineralogical structure of flux film with different F^-content were analyzed by the high temperature coefficient of thermal conductivity measuring device and heat flux and viscosity testing device.The results show that with F^-(4.22%~13.22%) increasing,the thermal conductivity of flux film decreases,and the crystallization ratio of corresponding flux film increases.The crystallization ratio of flux films are very high,reaching more than 75%overall.The crystalline minerals of flux films remain same kinds,with dominant cuspidine and wollastonite at different F^- Contents.Meanwhile,with the increase in F^-contents,the cuspidine content continues to increase while wollastonite content decrease significantly.These results have vital guiding significance on improving the strand quality for continuous casting of low fluorine mold flux.