Question

Pig iron is produced in a:

• A. Cupola furnace
• B. Electric furnace
• C. Blast furnace
• D. Open hearth furnace

Hint:

Logic Tip: The flow of iron making is straightforward: Iron Ore $\rightarrow$ Blast Furnace $\rightarrow$ Pig Iron $\rightarrow$ Steelmaking Furnace (Basic Oxygen/Electric) $\rightarrow$ Steel.

Answer 1

The Correct Option is C

Concept:
Pig iron is the raw, intermediate product of smelting iron ore with a high-carbon fuel and reductant. To produce it on an industrial scale, a specific type of continuous-operation furnace is required.

Step 1:
The primary raw materials used to produce pig iron are iron ore (like hematite or magnetite), coke (as fuel and reducing agent), and limestone (as a flux to remove impurities).

Step 2:
The reduction of iron ore requires an extremely tall, continuous counter-current reactor where hot gases rise and melt the descending raw materials at highly elevated temperatures (up to $2000^\circ$C).

Step 3:
A cupola furnace is primarily used in foundries for melting scrap iron or pig iron to cast into different shapes (cast iron), not for chemically reducing raw iron ore.

Step 4:
Electric arc furnaces and Open hearth furnaces are steelmaking furnaces. They are designed to refine existing pig iron and scrap steel by removing excess carbon to produce high-quality steel.

Step 5:
The Blast furnace is the massive, specialized industrial structure specifically built to smelt raw iron ore into liquid pig iron. Therefore, option (C) is the correct answer.