摘要
讨论了 FeO 熔渣的还原机理,认为FeO 熔渣与含碳铁水间的还原反应既有渣中 FeO 与铁水中碳间的直接还原,又有CO 气体与渣中 FeO 间的间接还原。总还原反应受扩散传质控制,还原反应表观活化能为128kJ/mol。针对熔融还原法的特点,考察了向含碳铁水中喷吹预还原铁精矿粉时熔渣中FeO 的还原反应速度、碱度及喷吹速度的关系,探讨了1550℃时熔渣碱度对固体碳与预还原铁精矿熔渣间反应速度的影响。结果表明,熔渣中FeO 还原速度随反应温度、熔渣碱度及喷吹速度的增加而加快;1550℃时,石墨块与熔渣中 FeO 的反应速度,随熔渣碱度增加而升高。
Based on the reduction mechanism of FeO molten slag discussed, it isfound that there are not only the direct reduction between FeO in slag andcarbon in molten iron but also the indirect reduction between CO gas and FeOin slag in a reduction reaction process of FeO molten slag with carbon -containingmolten iron. As a whole, the reduction reaction process is controlled by thediffusive mass- transfer with an apparent activation energy 128 kJ/mol. Therelation of reduction rate and basicity to the injecting velocity when injectingthe pre-reduced Fe fine concentrate into carbon- containing molten iron isinvestigated, as well as the effect of the basicity of molten slag at 1550℃ onthe reaction rate between solid carbon and molten slag of pre- reduced Fe fineconcentrate. The results indicate that the reaction rate of FeO in molten slagincreases with reaction temperature, basicity of molten slag and injectingvelocity, and at 1550℃ the reaction rate between graphite lumps and FeO inmolten slag increases with the basicity of molten slag.
关键词
熔融还原
铁精矿粉
动力学
熔渣
pre-reduced Fe fine concentrate
basicity of molten slag
smelt reduction
