无取向电工钢RH脱硫渣系的研究

Experimental Research on RH Desulfurization Slag for Non-oriented Electrical Steel Smelting

在15kg真空感应炉上，用CaO—Al2O3-SiO2-MgO渣系进行脱硫试验，探讨了脱硫渣系碱度、MI、Al2O3、CaF2对脱硫效果的影响。研究结果表明，随脱硫渣系碱度、MI、Al2O3和CaF2含量的增加，脱硫率都呈现先增加后减少的趋势。初始硫含量为0．00933％-0．01073％，加入脱硫渣系4min时间内表观脱硫速率为（0．00096—0．00149）％／min，平均脱硫率为81．2％，最高达86．8％。当脱硫渣中w（CaO）=58．15％、w（SiO2）=4．85％、w（Al2O3）=25％、w（MgO）=6％、w（CaF2）=6％，脱硫效果最好，此时钢液中硫为0．00133％。

Experiments on desulfurization of molten steel using CaO-Al2O3-SiO2-MgO based desulfurization slag was carried out in a 15 kg vacuum induction furnace. The effects of desulfurization slag basicity, MI, Al2O3 and CaF2 on desulfurization of molten steel were studied. The results show that with the increase of basicity, MI,Al2O3 or CaF2 in desulfurization slag, the desulfurization rate rises initially and then decreases. In addition, as the initial sulfur content is 0. 009 33% -0.010 73%, the apparent desulphurization rate reaches （0.000 96 -0.001 49） % / rain within d rain since the beginning of desulphurization, and the highest and average desulphurization efficiencies are 86. 8% and 81.2% respectively. Furthermore, as W（CaO） =58.15%, W（SiO2） =4.85%, w（Al2O3） =25%, w（MgO） =6%, w（CaF2） =6%, the desulfurization slag shows the best desulfurization effect, and the sulfur content in molten steel is 0.001 33%.