顶底复吹转炉内锰矿直接合金化的动力学模型

Kinetic Modeling of Direct Alloying with Manganese Ore in Top and Bottom Combined Blown Converter

考虑转炉内锰的还原反应速率,建立了顶底复吹转炉吹炼过程中锰矿还原的动力学模型.该模型不仅可以预测终点锰含量,还可以计算[Mn]含量随吹炼时间的变化情况,模型计算值和实测值吻合良好.结果表明,在冶炼单脱硫铁水的操作条件下如果要使锰的收得率达到50%,终点[C]含量应在0.12%以上或渣量小于40kg/t.降低供氧强度、提高复吹转炉底部供气强度能提高锰的收得率.高品位锰矿有利于提高锰矿合金化的效果.锰矿应在转炉冶炼的初期加入有利,可以延长锰矿的还原时间;加入时间越晚,随着锰矿加入量的增多,合金化的效果越差.

A kinetic model for manganese ore smelting reduction in top and bottom combined blown converter was developed considering manganese reduction reaction rate. Using the model it proved to be possible to estimate manganese content of the end point and whole period of operation with good accuracy. The results showed that the end point carbon concentration should be above 0.12% or slag volume below 40 kg/t for achieving 50% manganese yield in a combined blowing BOF for desulfurized hot metal without slag-less operation. Reducing oxygen blowing rate and increasing bottom blowing rate made manganese yield to increase. High manganese ore purity was advantaged. To prolong reduction time, that was to add manganese ore at the early stage of operation. The later the time of adding manganese ore was, the lower the manganese yield was with more addition of manganese ore.