Engineering Materials
Smelting is the process of

Reducing the ore with carbon in the presence of a flux
All of these
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

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Engineering Materials
Dow metal contains

90% magnesium and 9% aluminium with some copper
92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% aluminium and 90% copper

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