TY - GEN
T1 - Oxidation of flash reduced iron particles in various gas mixtures under the conditions of a novel flash ironmaking process
AU - Yuan, Zhixue
AU - Sohn, Hong Yong
AU - Olivas-Martinez, Miguel
PY - 2014
Y1 - 2014
N2 - A novel flash ironmaking process that directly reduces iron oxide concentrate particles by gas is under development. The goal of this work was to study the possibility of reoxidation 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 reoxidation because of equilibrium and high reactivity of iron particles. The effects of temperature (823-973 K) and H 2O partial pressure (40-100 pet., Ptotal = 86.1 kPa) on the reoxidation 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 O2-N2 mixtures, the effects of temperature (673-873 K) and O2 partial pressure (5-21 pet., P total = 86.1 kPa) were determined. Reoxidation in pure CO2 was also investigated at 873-1073 K for comparison.
AB - A novel flash ironmaking process that directly reduces iron oxide concentrate particles by gas is under development. The goal of this work was to study the possibility of reoxidation 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 reoxidation because of equilibrium and high reactivity of iron particles. The effects of temperature (823-973 K) and H 2O partial pressure (40-100 pet., Ptotal = 86.1 kPa) on the reoxidation 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 O2-N2 mixtures, the effects of temperature (673-873 K) and O2 partial pressure (5-21 pet., P total = 86.1 kPa) were determined. Reoxidation in pure CO2 was also investigated at 873-1073 K for comparison.
KW - Flash ironmaking
KW - Oxidation kinetics of iron particles
KW - Reduction of iron oxide
UR - http://www.scopus.com/inward/record.url?scp=84899747685&partnerID=8YFLogxK
U2 - 10.1002/9781118889657.ch50
DO - 10.1002/9781118889657.ch50
M3 - Contribución a la conferencia
AN - SCOPUS:84899747685
SN - 9781118889619
T3 - TMS Annual Meeting
SP - 509
EP - 517
BT - Celebrating the Megascale
PB - Minerals, Metals and Materials Society
T2 - Celebrating the Megascale: Extraction and Processing Division Symposium on Pyrometallurgy in Honor of David G.C. Robertson - TMS 2014 143rd Annual Meeting and Exhibition
Y2 - 16 February 2014 through 20 February 2014
ER -