Experimental Study on Phosphorus Vaporization for Converter Slag by SiC Reduction

The phosphorus vaporization experiment of converter slag was carried out in laboratory with SiC as reducing agent. The results show that 2CaO·SiO2 and 3CaO·SiO2 are the main phases in the final slag. After phosphorus vaporization operation, the dendritic Fe phase and a large number of C phases were distributed in the phosphorus vaporization slag excepted the above phase. The experimental result shows that phosphorus vaporization rate decreased with increasing the basicity in the slag. Phosphorus vaporization rate first increased and then decreased with increasing FeO in the slag and reached the maximum when the content of FeO was 20–25%. Phosphorus vaporization rate showed an upward trend with the increase of nitrogen flow rate and tended to be slow when the nitrogen flow rate was 0.4 m3/h. Phosphorus vaporization rate increased with increasing the reaction temperature, and the growth rate became gentle when the temperature was more than 1600 °C. Excessive addition of SiC will not obviously increase the phosphorus vaporization rate.