Carbothermic Reduction of Hematite with Graphite in Ar Atmos phere employing Thermogravimetry and Mass Spectrometry
The reduction of hematite-graphite pellet was investigated from a kinetic viewpoint in the temperature range of 1173 to 1473K (900 to 1200 ℃).The experimental procedure included thermogravimetric analysis (TGA) for measuring the weight change of the pellet and quadruple mass spectrometry (QMS) for monitoring the compositional change of the product gases.The predominant reduction time was taken when the reduction of Fe3O4 to wustite proceeded before the carb on gasification was activated to produce CO at 1273 K (1000 ℃).By applying uniform internal reduction model to the current system,the activation energies for the reduction of Fe3O4 to wustite and for that of wustite to Fe were evaluated to be 91.0 and 25.9 kJ/mol,respectively.Due to the product gas analyses by QMS,it was observed that the reduction rate of hematite-graphite pellet was accelerated up to the equilibrium concentration of CO determined by the carbon gasificati on curve,which made great contribution to the reduction of wustite into metallic Fe.
direct reduced iron (DRI) alternative ironmaking thermogravimetric analysis quadruple mass spectrometry (QMS) carbon gasification activation energy
JUNG Sung-Mo SASAKI Yasushi YI Sang Ho
Graduate Institute of Ferrous Technology,POSTECH,Pohang 790-784,Korea Ironmaking/FIN EX Research Group,POSCO,Pohang 790-783,Korea
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-7
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）