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Calcination is the process of heating the ore below its melting point in absence of air to remove volatile impurities like arsenic etc. Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities.
In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. ... Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.
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