采用分段法研究含镁球团等温还原过程动力学

摘要

In order to study the influence of MgO on reduction behavior of pellets and find the kinetic mechanisms, isothermal reduction experiment of three kinds of magnesium-containing pellets was done to research the reduction performance by weight loss method. Furthermore, the change of reduction degree and reduction rate was examined. The kinetics of reduction was analyzed by sectioning method, and two different kinetic mechanisms were found respectively at initial stage and later stage. Based on this, the dynamic models of different reaction stages were established, and the reaction rate constants were obtained. The results show that the reaction rate constant at initial stage is influenced significantly by the content of MgO. However, the content of MgO has less influence on the reaction rate of FeO reduction at later stage.%为了研究MgO添加剂对球团矿还原行为的影响以及确定还原反应过程动力学机理，采用球团矿的等温还原标准检验方法，测定3种不同含镁球团的还原性能，考察还原度与还原速率的变化情况。采用分段法对其还原反应过程动力学进行分析，确定反应过程前期和后期不同的动力学机理函数积分式，进而通过建立动力学模型，计算不同阶段的反应速率常数。研究结果表明：前期还原过程反应速率常数受镁含量影响较大，而后期浮氏体还原过程的反应速率常数则受镁含量的影响不大。