复合喷吹石灰与镁粉配比对铁水脱硫效果的影响

Effect of Ratio of Lime to Magnesium Powder in Combined Blowing Process on Desulfurization results of Hot Metal

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120 t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。

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.