金属镁粒铁水脱硫过程动力学

Dynamical Behaviors in Hot Metal Desulfurization by Magnesium

通过对金属镁粒铁水脱硫过程动力学的研究发现,金属镁粒的粒径越大,镁粒气化后的气泡在铁液中的停留时间和平均上浮速率就越大,铁液中镁脱硫反应的传质系数减小;上浮速率及停留时间与铁液温度几乎没有关系,但传质系数随温度的增加而增加;在一定的铁液深度和铁液硫含量时,金属镁粒铁水脱硫时镁的利用率随镁粒的粒径增加而减小;温度对镁的利用率的影响在镁粒粒径小时比粒径大时要大,在铁液硫含量小时比硫含量大时影响要大;就脱硫过程动力学而言,温度越高越有利于铁液中镁的脱硫反应,这与热力学结论相反;铁液温度为1 573 K,铁液中的w（[S]）为0.06%,铁水包的深度为3 m,在镁粒半径范围为（3-16）×10-4m时,理论计算镁脱硫时镁的平均利用率为83.1%,与宣化钢铁公司生产得到的数据进行了对比,得到很好的吻合。

Based on research of hot metal pretreatment process for desulfurization with magnesium, physical chemistry behavior of magnesium in hot metal and the dynamical behaviors of desulfurization with magnesium are obtained. When solid magnesium come into hot metal, some magnesium dissolve and saturate, the other become air bubbles reacted with sulfurization. More bigger of the radius of solid magnesiums are, more longer of the residence time and the rate of the magnesium bubble become, and little of the mass transfer coefficient are in the hot metal. It was founded that the residence time and the rate of the magnesium bubble upward was almost no relation with the temperature, but the mass transfer coefficient became bigger when the temperature became higher. When the radius of the solid magnesium increase, magnesium utilization ratio rise. In dynamical behaviors of hot metal desulfurization by magnesium, higher the temperature is, more rapid the desulfurization reaction is.