氧质量分数对于镁蒸气铁水脱硫的影响

Effect of Oxygen Concentration on Hot Metal Desulfurization with Magnesium Vapor

针对传统喷吹颗粒镁脱硫存在的镁利用率较低等问题,采用底吹镁蒸气进行铁水脱硫,旨在优化铁水脱硫的动力学条件,提高铁水脱硫过程中镁的利用率.对不同氧质量分数下硫的平衡质量分数进行了热力学计算,通过实验研究了氧质量分数对于铁水脱硫过程的动力学影响.结果表明:铁水中氧质量分数的降低有助于促进镁蒸气脱硫反应的进行,当氧质量分数为62×10-6时,镁利用率可达78%,脱硫率可达82%.脱硫反应传质系数为0. 012 2 m/s.

In view of the low utilization rate of magnesium generally obtained under traditional desulfurization processing,the method of bottom-blown magnesium vapor was used for hot metal desulfurization in order to optimize the dynamic conditions and to improve the utilization rate of magnesium in hot metal desulfurization.Thermodynamic calculation of the equilibrium concentration of sulfur under different oxygen concentrations was carried out,and the effect of oxygen concentration on the kinetics of hot metal desulfurization process was studied by experiments.The results show that the reduction of oxygen concentration in molten iron is helpful for promoting the desulfurization with magnesium vapor.When oxygen concentration arrives 62×10-6,the utilization rate of magnesium can reach 78%,leading to a desulfurization rate of 82%and a mass transfer coefficient of desulfurization of 0.0122 m/s.