THE MIDREX® SHAFT FURNACE

The heart of the MIDREX® Process is the MIDREX® Shaft Furnace.  This key component of the MIDREX® Direct Reduction Process is the most flexible and versatile reduction vessel for DRI producers.

Operation of the MIDREX® Shaft Furnace is uncomplicated and straight-forward:

  • Iron oxide pellets and/or lump are fed to the top of furnace and flow downward
  • Iron oxide is heated and converted to DRI by a high temperature reducing gas
  • Products can be discharged hot or cold in combinations that include CDRI, HBI and/or HDRI

The MIDREX® Shaft Furnace is designed to:

  • Capitalize on the principle of counterflowing gas and solids to maximize reduction efficiency
  • Assure uniform solids flow by effectively distributing the furnace burden and avoiding material bridging
  • Control the flow of gases between the various furnace zones
  • Prevent the reducing gas from coming into contact with air
  • Prohibit gas flows from fluidizing the furnace burden
  • Maintain a uniform temperature profile across the cross-section of the furnace
  • Avoid stoppages of furnace burden flow
  • Eliminate the need for a water-cooled discharge cone
  • Operate cost-effectively even when operating at as low as 30% of capacity