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Metallurgy of Fe is carried in Blast fu...

Metallurgy of `Fe ` is carried in Blast furnace. Blast furnace is divided in following zones.
`a.` Combustion zone `b.` Fusion zone
`c.` Reduction zone `d.` Preheating zone
Slag formation is important because

A

It helps to remove impurities from molten metal

B

It prevents contact of molten metal and air

C

It helps to remove volatile impurities

D

Both `(1)` & `(2)`

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