无取向电工钢RH深脱硫工业试验

Industrial experiment on the deep desulphurization of non-oriented electrical steel in RH process

采用CaO-CaF2复合渣系为脱硫剂,利用RH投入法对无取向电工钢进行工业深脱硫试验。试验结果表明,在脱硫剂加入量为7 kg/t时,钢中平均硫质量分数从31×10-6降低到18×10-6,RH平均脱硫率为41.7%,最高达47.1%。对钢包顶渣中w(FeO+MnO)、碱度、MI指数(炉渣系数)进行分析表明,w(FeO+MnO)是RH脱硫效果的主要影响因素,控制w(FeO+MnO)≤5%,顶渣碱度R≥5,RH能够获得较好的脱硫效果。

The industrial experiments on deep desulphurization of non-oriented electrical steel were carried by adding （CaO-CaF2） based fluxes in RH process. The results show that the desulphurizer addition level of 7 kg/t can desulphurize the liquid steel from average 31× 10-6 to 18 ×10-6, and the average and highest desulphurization efficiency are 41.7 % and 47. 1 %respectively. The influence of ω（FeO ＋ MnO）, basicity and MI （slag coefficient）in the ladle top slag at the end of RH treatment on desulphurization efficiency is analyzed. The mass fraction of （FeO ＋ MnO） plays a main role on desulfurization effect. Better desulfurization efficiency can be achieved when the mass fraction of （FeO＋ MnO） is below 5 % and slag basicity over 5 in the process of RH desulfurization.