机械活化条件下超细铁矿粉氢基还原特性及机制

摘要：通过热重法研究了不同机械活化程度的铁矿粉氢基还原特性，并分析和探讨了其还原反应机制。实验结果表明，机械活化对氢气还原铁矿粉有促进作用，机械活化时间越长，还原特征温度越低，还原反应所需的活化能也越低，但反应机制未发生变化，反应的限制性环节是其界面反应。机械活化明显影响到超细铁矿粉的逐级反应，对于未经活化的铁矿粉而言，逐级反应层次极不明显，而对于活化后铁矿粉的逐级反应层次随着活化时间的增加越发分明。

Hydrogen reduction characteristics and mechanism of ultrafine iron ore powder under mechanical activation

Abstract：The hydrogen based reduction characteristics of iron ore powder with different degrees of mechanical activation were studied by thermogravimetry, and the reduction reaction mechanism was analyzed and discussed. The experimental results show that mechanical activation has a facilitating effect on the reduction of iron ore powder by hydrogen, and the longer the mechanical activation time, the lower the reduction characteristic temperature and the lower the activation energy required for the reduction reaction, but the reaction mechanism remains unchanged, and the restrictive step of the reaction is its interfacial reaction. Mechanical activation obviously affects the step by step reaction of ultrafine iron ore powder, for the unactivated iron ore powder, the step by step reaction level is extremely insignificant, while for the activated iron ore powder the step by step reaction level becomes more and more distinct with the increase of activation time.