Kinetic Aspects of Iron Ore Pellet Reduction With Hydrogen

To reduce CO2 emissions in the steel industry, one approach is to replace carbon with hydrogen as the reducing agent in the DRI shaft furnace EAF process. To evaluate how this change affects the reduction kinetics of pellets of different sizes, thermogravimetric analysis was performed under isothermal conditions. The reduction extent was measured by XRD (Rietveld method), and the DRI regions were characterized by SEM. The results showed that the use of hydrogen resulted in a core of unreduced wustite with lower microporosity compared to other regions, related to the presence of magnetite instead of hematite in the pellet center.

Authors:

Rafaela Rapalo | Carnegie Mellon University
 

Dr. P. Chris Pistorius | Carnegie Mellon University
 

Session Chairs:

Tom Battle | Extractive Metallurgy Consultants
 

Janne Tikka | AFRY
 

Lisa Young | Cleveland-Cliffs Cleveland Works LLC