无取向电工钢深脱硫试验

Experiment Research on Deep Desulphurization of Non-oriented Electrical Steel

为满足用户对无取向电工钢中硫含量的要求，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深脱硫试验。试验结果表明，RH精炼渣成分控制在WCa043％～51％、WAh0325％-31％、wMgO4％～6％、WsiO29％～12％、W（FeO＋MnO）3％～6％，在脱硫剂加入量为6—8kg／t时，钢中平均硫含量从32×10^-6降低到18×10^-6，RH平均脱硫率为43．3％，最高达47．1％。利用KTH模型计算精炼终渣平均硫容量为0．0031，RH精炼结束时渣一钢间实际平均硫分配比从14增加到52。

In order to satisfy the requirements of consumers on sulfur content in non-oriented electrical steel, taking （CaO-CaF2） based flux as desulfurizer, industrial experiments on deep desulphurization of non-oriented electrical steel were carried out during RH process. The results show that as the composi- tions of refining slag are appropriately controlled with w cao of 43 % - 51% , w Al2O3 of 25 % - 31% , WUsO of 4% -6%, wsiO2 of 9% -12% , and w（Feo＋Mno） of 3% - 6% , and the desulfurizer added are at 6 - 8 kg/t, the average sulfur content in liquid steel can be reduced from 32 × 10-6 to 18 × 10-6 with the aver- age and highest desulphurization degrees of 43.3 % and 47.1% respectively. Calculated with KTH mod- el, the average sulfide capacity in final slag is 0.0031, and the average equilibrium distribution ratio of sulphur in the final slag increases from 14 to 52 at the end of refining in RH.