Syngas for DRI
DRI (Direct Reduced Iron) is a solid form of elemental iron produced by reducing iron oxide to remove the oxygen and leave only elemental iron.
The DRI reducing reactions are:
– Fe2O3 + 3 H2 → 2 Fe + 3 H2O
– Fe2O3 + 3 CO → 2 Fe + 3 CO2
These reactions are conducted at 800 – 900°C, which is below the melting point of iron (1536°C or 2797°F).
A blast furnace is the primary competitive option to making elemental iron. In a blast furnace, iron oxide is reduced at high temperature to make a liquid form of elemental iron.
Advantages of Syngas for DRI:
• Low quality feedstocks, such as low rank coal, can be used for gasification while blast furnaces require coking coal, a high quality feedstock.
• DRI plants have significant turndown capabilities, while blast furnaces do not
• Gasification+DRI is much more environmentally friendly than a blast furnace.
In 2015, DRI production is about 5% of the total global iron production (blast furnaces produce remaining 95%).
Syngas for DRI in Angul, Orissa, India. Photo courtesy of Jindal Steel & Power Ltd.
Syngas for DRI in Saldanha Bay, South Africa. Photo courtesy of ArcelorMittal South Africa
This article has benefited the major contribution of Midrex, USA
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