Comparison of the Morphology and Physical Properties of CDRI Following Hydrogen and Natural-Gas-Based Reduction and Carburization

The morphology and physical properties of cold direct reduced iron (CDRI) are influenced by reducing gas composition and must be understood to avoid operational issues and loss of materials during processing and transportation. The effects of gas composition on the density, porosity, reduction swelling, cold crush strength, and fines generation of carburized and noncarburized CDRI were investigated. DRI from a variety of iron oxide feedstocks were reduced with gas mixtures containing different proportions of H2, N2, CO, CO2, and CH4 representing H2- and natural-gas-based reduction conditions. Study shows that the morphology and strength of H2-and NG-reduced CDRI are comparable.

Authors:

Dr. Pei Yoong Koh | Midrex Technologies Inc.
 

Dr. Kentaro Urata | Kobe Steel, Ltd.
 

Takayuki Koyama | Kobe Steel, Ltd.
 

Session Chairs:

Tom Battle | Extractive Metallurgy Consultants
 

Janne Tikka | AFRY
 

Lisa Young | Cleveland-Cliffs Cleveland Works LLC