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高温熔融状态下TiO_2使Fe_3O_4还原反应速度明显降低.反应全过程分为三个阶段。第三阶段的速度最慢,是全过程的限制。试料中TiO_2含量愈高则第三阶段开始时的还原率愈低,第三阶段愈长。反应中由于CO气体排出而使融体膨胀,试料中TiO_2含量愈高则膨胀高度愈低。反应第三阶段,融体的膨胀已基本消失。TiO_2含量一定时,提高炉渣碱度和反应温度均可加快反应速度。反应第二阶段为一级反应,可用1n(1-R)=-Kt来描述,以求出反应速度常数K。
Under the condition of high temperature melting, TiO 2 reduced the reaction rate of Fe 3 O 4 reduction obviously.The whole process of reaction was divided into three stages. The third phase of the slowest, is the whole process of the restrictions. The higher the TiO 2 content in the sample, the lower the reduction rate at the beginning of the third phase, the longer the third phase. In the reaction, the melt expands due to the discharge of CO gas, and the higher the TiO 2 content in the sample, the lower the expansion height. The third stage of reaction, the melt expansion has basically disappeared. When the content of TiO 2 is constant, raising the basicity of slag and the reaction temperature can accelerate the reaction rate. The second stage of the reaction is a first order reaction, which can be described by 1n (1-R) = - Kt to find the reaction rate constant K.