|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Celebrating the Megascale: An EPD Symposium in Honor of David G.C.Robertson
||Oxidation of Flash Reduced Iron Particles in Various Gas Mixtures under the Conditions of a Novel Flash Ironmaking Process
||Zhixue Yuan, Hong Yong Sohn, Miguel Olivas-Martinez
|On-Site Speaker (Planned)
A novel flash ironmaking process that directly reduces iron oxide concentrate particles is under development. The goal of this work was to study the possibility of re-oxidation of iron particles in various gas mixtures. As the product iron cools down in the lower part of the flash reactor, conditions may become favorable for re-oxidation because of equilibrium and high reactivity of iron particles. The effects of temperature (823 – 973 K) and H<SUB>2</SUB>O partial pressure (40 – 100 pct.) on the re-oxidation rate were examined. The pressure dependence was first order with respect to water vapor, and the activation energy was 146 kJ/mol. A complete rate equation that adequately represents the experimental data was developed. For oxidation in O<SUB>2</SUB>-N<SUB>2</SUB> mixtures, the effects of temperature (673 – 873 K) and O<SUB>2</SUB> partial pressure (5 – 21 pct.) were determined. Re-oxidation in pure CO<SUB>2</SUB> was investigated at 873 – 1073 K.
||Planned: A print-only volume