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The impurities are burnt from which material in an open hearth furnace to produce steel?

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in Casting-Forming-Welding II by (119k points)
The impurities are burnt from which material in an open hearth furnace to produce steel?

(a) Cast iron

(b) Gray iron

(c) Pig iron

(d) Copper

The question was asked at a job interview.

Question is taken from Open Hearth Surface in section Metal Furnace and Practice of Casting-Forming-Welding II

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Right answer is (c) Pig iron

The best I can explain: The materials such as high carbon content or other impurities which are present inside the pig iron are burnt in order to obtain steel.

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