In an iron blast furnace, what serves as the primary reducing agent____________________?
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Answer: B. Carbon monoxide
Explanation
Carbon monoxide gas reacts directly with iron oxides to yield metallic iron and carbon dioxide. This reducing gas flows upward through the blast furnace countercurrent to the descending solid charge. Metallurgical reduction processes require agents that readily donate electrons to strip oxygen from metal ores. An iron blast furnace is a massive refractory lined vertical shaft reactor used for smelting iron ores. Coke is burned near the bottom of the furnace to generate the essential carbon monoxide reducing gas. Raw materials charged into the top include iron ore pellets, limestone flux, and metallurgical coke.
Carbon dioxide acts as an oxidizing agent in certain furnace zones rather than reducing iron oxides. Oxygen is injected to combust coke and generate heat but does not serve as the reducing agent. Air provides the necessary oxygen for combustion but remains chemically inert compared to generated carbon monoxide.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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