Direct reduced iron

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What Wikipedia says

Direct reduced iron (DRI), also called sponge iron, is produced from the direct reduction of iron ore (in the form of lumps, pellets, or fines) into iron by a reducing gas which contains carbon (produced from natural gas or coal) or hydrogen. When hydrogen is used as the reducing gas, no carbon dioxide is produced.

Excerpt from the Wikipedia article “Direct reduced iron”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Eugen Nosko, CC BY-SA 3.0 de, via Wikimedia Commons.