低碱度脱磷渣在转炉少渣冶炼中的作用

以SGRS工艺为基础,研究了低碱度脱磷渣在转炉少渣冶炼中的作用.根据少渣冶炼物料平衡原理,脱磷阶段结束炉渣碱度控制越低,相当于转炉回收利用的Ca O量越多,能够实现的钢液去Si量也越多.同时实验结果表明,随着脱磷渣碱度的降低,炉渣的熔化性能逐渐改善,带来脱磷阶段结束转炉倒渣量不断增加以及脱磷渣金属铁含量不断降低的有益效果.当脱磷渣碱度在1.2~1.8范围时,脱磷渣半球点温度基本控制在1 380℃以内,脱磷渣中的游离Ca O质量分数控制在0.7%左右的较低水平,同时转炉脱磷阶段结束转炉倒渣量基本可控制在8 t(210 t转炉)或5 t(100 t转炉)以上.

Effect of Low Basicity Dephosphorization Slag in BOF Slagless Steelmaking

Based on SGRS technology， the effect of low basicity 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 CaO will be recycled and the more desilicication of liquid steel will be attained. At the same time， the experimental results show that， 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 below 1380℃， the free CaO 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 8t (210t BOF) or 5t (100t BOF).