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Which is the iron ore processed in blast furnaces?

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Which is the iron ore processed in blast furnaces?

(a) Hematite

(b) Magnesia

(c) Alumina

(d) Silica

This question was posed to me by my school principal while I was bunking the class.

Query is from Sintering and Compacting, Pig Iron and its Manufacture topic in division Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Right answer is (a) Hematite

Explanation: The iron ore processed in blast furnaces is usually in the form of an oxide. This is either hematite or magnetite. Hematite contains 50-65% iron and is used in a greater proportion than magnetite. The ore pieces are usually less than 100 mm in diameter.

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