Effect of Low Basicity Dephosphorization Slag in BOF Slagless Steelmaking

Based on SGRS technology,the effect of lowbasicity dephosphorization( De-P) slag in BOF slagless steelmaking was studied. According to the mass balance of slagless steelmaking,the lower the basicity of De-P slag is,the more Ca O will be recycled and the more desilicication of liquid steel will be attained. At the same time,the experimental results showthat,with the decrease of De-P slag basicity,the slag melting performance is gradually improved,leading to the beneficial outcomes of increasing the deslagging quantity and reducing the metallic iron content in De-P slag. When the basicity of De-P slag is 1. 2- 1. 8,the hemisphere temperature of De-P slag could be controlled below1 380 ℃,the free Ca O content of De-P slag could be controlled at around 0. 7%,and the amount of BOF deslagging in the end of De-P stage could be controlled more than 8 t( 210 t BOF) or 5 t( 100 t BOF).