Engineering Materials
Sulphur in cast iron

Make the iron white and hard
Increases hardness and brittleness
Aids fusibility and fluidity
Makes the iron soft and easily machinable

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Engineering Materials
Smelting is the process of

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

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