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以CaO-CaF2复合渣系为脱硫剂,在RH精炼过程采用真空投入法进行高牌号无取向电工钢深脱硫工业试验,采用KTH模型计算分析了RH炉渣成分对硫容量CS的影响。研究结果表明,炉渣成分控制在w((CaO))/w((SiO2))为5~7,w((CaO))/w((Al2O3))为1.5~1.8,w((Al2O3))为25%~30%,w((FeO+MnO))<5%,脱硫剂加入量为6~8kg/t时,钢中硫质量分数从平均0.003 1%降低到0.001 8%,最高脱硫率达到47.1%,平均脱硫率为41.7%。
Taking CaO-CaF2 composite slag system as desulfurization agent, the industrial vacuum desulfurization process of high-grade non-oriented electrical steel was carried out in RH refining process. The effect of RH slag composition on sulfur capacity CS was analyzed by KTH model. The results show that the composition of the slag is controlled in the range of 5 ~ 7 for w ((CaO)) / w ((SiO2)) and 1.5 ~ 1.8 for w (Al2O3) Is 25% -30%, w ((FeO + MnO)) is less than 5% and the desulfurization agent is 6-8 kg / t, the content of sulfur in steel decreases from 0.003 1% to 0.001 8% Reaching 47.1%, the average desulfurization rate was 41.7%.