| 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. |
