Abstract:Kinetic of reduction, as well as characteristic and mechanism, of micronnanometer ferric oxide powder at low temperature was investigated. The powder was obtained by high energy milling and then reduced at 280-400℃ with hydrogen. Oxygen in the reduced powder was determined and reduction rate was calculated. Morphology of the reduced powder was analyzed by SEM. Influence of the iron oxide size and reduction temperature and time on reduction rate, reduced powder size and distribution and morphology was found. Influence of reduction activation energy of micronnanometre ferric oxide powder at low temperature was investigated in consideration of kinetic. The analytic results show that the reaction of superfine ferric oxide powder can be explained with the theory of adsorption. The process of the reaction is under cocontrol between interfacial chemical reaction and gas inner diffusion. The apparent activation energies are assessed. After analysis of the relations between reduction temperature and reduction rate, the reaction mechanism and dynamic equation of reduction reaction of ferric oxide powder with hydrogen are found out.
王兴庆,钟军华. 微纳米氧化铁粉低温还原特性的研究[J]. 中国冶金, 2007, 17(8): 23-23.
WANG Xingqing,ZHONG Junhua. Research on Reduction Characteristic of MicronnanometerFerric Oxide Powder at Low Temperature. China Metallurgy, 2007, 17(8): 23-23.