应用失莺技术研究了450～600℃下氢气还原超细氧化铁粉过程.采用扫描电镜和X射线来分析还原过程中的结构及物相变化.研究结果表明,由于纳米颗粒的尺寸效应,反应初始速率增加.不同温度下,还原速率随着还原程度增加而减小.还原过程的速率控制过程通过反应过程中的部分结构变化、活化能及气固反应数学模型确定.结果表明,H2还原超细氧化铁的初始阶段由化学反应过程控制,在反应后期阶段,反应过程是受化学动力学和内扩散的混合控制.
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