Study of the Reduction Process of Iron Oxide by High Temperature X-ray Apparatus at Low Temperature

This study deals with the reduction process hematite and magnetite with CO gas during gradual heating to 800°C. The process is analysed by high temperature X-ray diffraction technique. The main results are as follows;1) The mechanism of production and vanishing of vairous products obtained in the CO reduction process of hematite and magnetite ores is clarified;2) The wüstite (FeO) is most slowly reduced among the products obtained in the CO reduction process, furthermore, the reduction velosity of FeO obtained by the reduction of magnetite is slower than that of FeO obtained by the reduction of hematite.3) It is observed that the number of pore in FeO produced from hematite is larger than that from magnetite. The difference of porosity is considered to be one of factors influencing on the reduction velocity of FeO;4) The iron produced by the reduction of FeO consists of α-phase, and subsequently, transformed to γ-phase;5) The cementation structure of iron cristal of γ-phase is microscopically observed.