What Does Direct-reduced Iron (DRI) Mean?
Direct-reduced iron (DRI) is a type of metal substance produced from heating elemental iron in the presence of gas generated from natural gas or coal burning.
Due to the low degree of oxygen present, DRI is prone to oxidation and has a higher corrosion rate compared to other types of iron. Appropriate corrosion prevention methods must be used to prevent the deterioration of DRI in industrial applications. Further treatment of DRI results in the formation of wrought iron and steel.
Corrosionpedia Explains Direct-reduced Iron (DRI)
Direct-reduced iron (DRI) reacts with reduced gases that have been stripped of oxygen at temperatures below the melting point. The procedure results in a purer iron strain that is void of impurities and fillers. DRI occurs in an environment that is heated to a temperature of 1000°C - 1200°C (1830°F - 2190°F) in a chemically reducing atmosphere.
The following parameters may be altered to generate variations in the type of DRI produced:
- Furnace type
- Reductant fuel (coal or natural gas)
- Iron ore input (lump, pellet, fines)