120 t复吹转炉单渣法高拉碳工艺

 在复吹转炉铁水消耗1 050 kg/t(钢)，铁水磷质量分数小于0.150%条件下，采用单渣法高拉碳工艺进行试验研究，实现了出钢碳质量分数大于0.40%，磷质量分数小于 0.020%。分析了高拉碳的操作控制难点是脱磷效率低、易喷溅和终点拉碳时机难以精确掌握。为此，对转炉操作抢位、氧压、底吹流量以及终点控制等方面进行了调整试验，试验结果表明：高枪位配合合适的底吹压力在提高脱磷效率的同时能有效控制喷溅；建立高碳出钢终点判断模型，能将碳命中率提高到90%以上。该工艺实施后，转炉终点游离氧保持在约100×10-6。

High Carbon Technology With Single Slag Process in Combined Blowing Converter

In order to achieve [w(C)＞0.4%] and [w(P)＜0.02%] at tapping, a single-slag decarburization process at the condition of 1 050 kg/t consumed by hot metal and [w(P)=0.15%] was developed. Lower dephosphorization, splashing and difficulty of pulling carbon time is the most difficult point of the process. Therefore, the adjustment test on the converter operation taking place, oxygen pressure, the flow of bottom blowing and the end control are taken. Experimental results indicate that splashing can be efficiently controlled while improving the dephosphorization efficiency with suitable bottom blowing pressure. The carbon percentage increased to more than 90% by establishing high carbon tapping end-point judgment model. After the implementation of the process, BOF end-point free oxygen is maintained at about 100×10-6.