WHAT
Corex is a coal-based smelting process that yields hot metal or pig iron. Integrated mills or EAF mills can use the output.
HOW
The process gasifies non-coking coal in a smelting reactor, which also produces liquid iron. The gasified coal is fed into a shaft furnace, where it removes oxygen from iron ore lumps, pellets or sinter; the reduced iron is then fed to the smelting reactor.