A laboratory fluidized bed reactor was used to investigate the fluidization behavior and reducibility of various iron ore fines. Hydrogen was chosen as a reducing agent across a temperature range of 873–1073 K. The magnetite ore used exhibited strong sticking behavior after the initiation of metallic iron formation. All other tested ores fluidized sufficiently well when subjected to the same high reduction temperatures. Parallel kinetic analysis was conducted using a previously developed model to include three rate-limiting step types. The trend of apparent activation energy was correlated with the degree of reduction. Additionally, the influence of varying the specific gas rate was investigated. The results show the variation in reducibility as a result of different interactions, which influence the rate-limiting mechanisms of nucleation and the undertaken chemical reactions, which vary as a function of temperature and degree of conversion. The apparent activation energies, determined from the reduction of wüstite to metallic iron, were in the range of 15–60 kJ/mol, depending on the iron ore used and the degree of conversion. The change in apparent activation energy deriving from the increased specific gas rate can be explained by an increasing nucleation effect, especially at lower reduction temperatures.

实验室流化床反应器用于研究各种铁矿粉的流化行为和还原性。在873–1073 K的温度范围内，选择了氢气作为还原剂。所使用的磁铁矿矿石在金属铁形成开始后就表现出很强的粘结性能。在相同的高还原温度下，所有其他测试矿石均能充分良好地流化。使用先前开发的模型进行平行动力学分析，以包括三种限速步骤类型。表观活化能的趋势与还原程度相关。此外，还研究了改变比气率的影响。结果表明，由于不同的相互作用，还原性发生了变化，它们影响成核和进行的化学反应的限速机理，它们随温度和转化度而变化。由白铁矿还原为金属铁所确定的表观活化能在15-60 kJ / mol的范围内，具体取决于所使用的铁矿石和转化程度。由增加的特定气体速率引起的表观活化能的变化可以通过成核效应的增加来解释，特别是在较低的还原温度下。