180 t RH真空精炼炉脱硫工艺开发及应用

Development and application of desulfurization process for 180 t RH vacuum refining furnace

针对铝镇静无取向硅钢成品硫质量分数超标问题,开发了RH脱硫工艺。通过选择合适的脱硫渣系以及工艺参数,使RH工位脱硫率达到30%~60%,W800系列无取向硅钢成品w（[S]）≤0.005 0%,达标率由72.19%提高至98%以上,同时确保了RH出钢w（T[O]）〈0.002 0%,w（[N]）〈0.001 5%。通过转炉出钢和RH过程炉渣脱氧改质,将RH出钢渣中w（（TFe））控制在3%以下,RH过程炉渣碱度保持在5.0以上,使渣-钢之间硫的分配比达到80~260,有助于提高RH脱硫效果。

The desulfurization technology in the RH process was developed to reducethe sulfur mass percent in the nonoriented silicon steel. The desulfurization degree was controlled at 30%-60% in a RH reactor,and the ratio of in the W800 non-oriented silicon steel with w（[S]）≤ 0.005 0% was increased from 72.19% upto 98%. Meanwhile,this process was able to ensure that w（T[O]）〈 0.002 0% and w（[N]）〈 0.001 5% at the end of the RH treatment. Through the slag deoxy-modification during the tapping and the RH treatment,w（（TFe）） at the end of the RH treatment was controlled below 3%. The slag basicity was kept above 5.0,and the sulfur distribution ratio between slag and steel was controlled at 80-260,which is favored to the improvement of the desulfurization process in the RH treatment.