RH-KTB预熔渣深脱硫实践

RH-KTB Deep Desulfurization Practice Using Premelted Slag

在宝钢炼钢厂300 t RH-KTB上进行了超低碳超低硫钢的预熔渣深脱硫试验。试验共12炉,预熔渣加入量为4 kg/t。试验结果表明,在RH平均初始w(S)为42.1×10-6条件下,处理终点平均w(S)达到30×10-6,最低w(S)达到22×10-6,最高脱硫率达到36.6%,平均脱硫率达到28.6%,取得了较好的深脱硫效果。采用预熔渣处理过程钢中w(TO)及w(N)均有所降低。试验炉次钢中最低w(TO)为12×10-6,平均w(TO)为13.3×10-6,最低w(N)为11×10-6,平均w(N)为13.8×10-6。RH终点钢中的夹杂物主要是Al2O3,95.1%的夹杂物小于5μm。

The industrial desulfurization test on 300 t RH-KTB unit at Baosteel using premelted slag was carried out. The total experimental heat number was 12. The consumption of premelted slag was 4 kg per ton steel. The average sulfur content in molten steel before RH refining was 42. 1 × 10^-6. After RH treatment it was decreased to 30 × 10^-6. The lowest sulfur content in molten steel was 22 × 10^-6. The max and average desulfurization rate were 36.6%and 28.6% respectively. The total oxygen content and nitrogen content were decreased when premelted slag was used. The lowest total oxygen content was 12 × 10^-6, the mean total oxygen content was 13.3 × 10^-6. The lowest nitrogen content was 11 × 10^-6, the mean nitrogen content was 13.8 × 10^-6. Most of the inclusions in steel at the end of RH treatment were Al2O3 ,and the diameter of 95. 1 percent inclusions was smaller than 5μm.