Reduction Rates of Iron Oxide Pellet with Hydrogen at High Pressures

Abstract

In order to obtain the reduction rate equation and the rate parameters of iron oxide pellet at high pressure, a single iron oxide pellet was reduced with hydrogen at pressure up to 13 atomospheres in the temperature range of 800 to 1000°C. The reduction rate equation was derived from the three-interface core model.
The reduction rate increased by a pressure increase, but was found to be constant at about 5 atomospheres. The various rate parameters were determined by the method of data fitting based on the observed data. The calculated reduction curves based on the rate equation almost coincided with observed data under various temperatures and pressures. And also, the reaction interfaces observed from the partially reduced pellets were nearly consistent with the caluculated values. It was found from these results that the reduction rate equation in this paper could be applied to the analysis of the rate of reduction with mixtures of hydrogen and carbon monoxide at high pressures.