Industrial experimental on dephosphorization pretreatment in combined-blowing converter

Through field test on dephosphorization in 300 t combined-blowing converter of Shougang Jingtang Iron Steel United Co.Ltd.,the effects of semi-steel temperature,slag oxidation,dephosphorization slag basicity as well as semi-steel w(C)/w(P) on dephosphorization rate and phosphorus partition were studied.The results showed that the finished mass fraction of phosphorus in semi-steel could be controlled less than 0.030%under the condition of semi-steel temperature and slag basicity controlled within 1 290-1 310℃and 1.9-2.5 respectively,which could make the average mass fraction of phosphorus reach to 0.026%in semi-steel,and the rate of w(P)0.030% reach 81.01%.The average phosphorus content and dephosphorization rate were improved obviously.