Engineering Materials
Smelting is the process of

Reducing the ore with carbon in the presence of a flux
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water

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Engineering Materials
Recrystallization temperature is one

At which crystals first start forming from molten metal when it is cooled
At which crystals grow bigger in size
At which change of allotropic form takes place
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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