Engineering Materials
Delta iron occurs at temperature of

Between 1400°C and 1539°C
Above melting point
Between 910°C and 1400°C
Room temperature

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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
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
Reducing the ore with carbon in the presence of a flux

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