Commercial direct reduction processes yield a product commonly known as___________________?
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Answer: C. Sponge iron
Explanation
Commercial direct reduction processes remove oxygen from iron ore in the solid state without melting it. This chemical reduction yields a porous, high-purity iron product that resembles a sponge in its internal structure. Sponge iron serves as a valuable scrap substitute in electric arc furnace steelmaking operations worldwide. Direct reduction utilizes reducing gases like carbon monoxide and hydrogen to strip oxygen from iron pellets. Operating below the melting point of iron distinguishes this method from traditional blast furnace smelting processes. The resulting sponge iron contains low levels of residual tramp elements, making it ideal for high-quality steel production.
Liquid iron is produced by traditional blast furnaces where the ore is completely melted during the reduction process. Solid iron is too broad a term, whereas sponge iron specifically describes the porous product of direct reduction. Iron saturated with carbon describes pig iron rather than the low-carbon porous product of direct reduction.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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