Abstract: Principle and feature of combined blowing process of lime to magnesium for desulfurization of hot metal are briefly introduced, and the effect of ratio of lime to magnesium powder 2. 0 ~ 3. 5 ： 1, 3.5 ~ 5. 0 ： 1 and 5.0 ~ 6.5：1 on end sulfur in metal, resulphurization rate, iron loss and temperature drop in blowing process, desulphurization time and 120 t BOF steelmaking results are commercial-tested. It is obtained that with using the ratio of lime to magnesium powder 3. 5 ~5. 0 ： 1, the resulphurization amount is less than 0.003 5% , the iron loss is less than 26 kg/t, temperature drop is less than 18 ℃ and the yield of steel liquid is more than 87% , so the production cost decreases markedly.

摘要： 简述了石灰与镁粉复合喷吹铁水脱硫的原理和特点,生产试验了石灰:镁粉为2.0～3.5:1,3.5～5.0:1和5.0～6.5:1对铁水终点硫,钢水回硫率,铁水损失,喷吹过程铁水降温,脱硫时间和120t转炉冶炼效果的影响,得出采用石灰:镁粉配比3.5～5.0:1时,可实现回硫小于0.003 5%,铁损小于26 kg/t,温降低于18℃,钢水收得率87%以上,成本显著降低。