The use of Hot Briquetted Iron (HBI) in the Electric Arc Furnace (EAF)

Hot Briquetted Iron (HBI) is a manufactured product with guaranteed specifications, which allows steelmakers to produce grades of steel not possible with scrap charges alone.

The use of HBI in the Electric Arc Furnace

Benefits from the Using HBI in the Electric Arc Furnace Are:

  • Chemical composition is well defined
  • Physical properties are known
  • Can be used in either long or short arc operation
  • Lower residual content than scrap
  • High apparent density of > 5000 kg/m3 (>312 lb/ft3)

  • Higher bulk density than scrap (average: 2800 kg/m3 or 175 lb/ft 3)
  • Rapidly sinks through the slag for rapid melting on the liquid steel
  • Can be used in scrap preheating processes

  • Can be stored outdoors in bulk
  • Can be moved easily on conveyor belts
  • Free-flowing from bins
  • Can be charged in scrap buckets
  • Can be continuously charged
  • Controlled carbon content
  • Useful in slag foaming
  • Controlled boil rinses nitrogen from steel bath

Charging Practices

  • Fill the rest of bucket according to local practices

First Bucket Layering Distribution

Typical Operating Results

Nitrogen_Copper vs HBI

Hot Briquetted Iron (HBI) Preheating

  • Industrial experiences under certain operating conditions and equipment have demonstrated that Hot Briquetted Iron (HBI) can be preheated to temperatures greater than 750°C in gases containing less than 5% oxygen either as part of the scrap mix or when using 100% Hot Briquetted Iron (HBI).
  • By preheating the Hot Briquetted Iron (HBI), the metallization ratio is increased by about 2% when reaching temperatures greater than 550°C. However, the carbon content will be decreased.
  • During preheating, some re-oxidation occurs. However, the grain in metallization offsets the effect.