1.

Explain the process of calcination.

Answer»

Solution :(1) Calcination is a process in which the ore is heated to a high TEMPERATURE below the melting point of the metal in the absence of air or limited supply of air in a reverberatory furnace.
(2) Following changes take place during calcination :
(i)Moisture and water from hydrated ores, volatile impurities and organic matter are removed.
(ii)ore becomes prorous.
(iii) Carbonates decompose to OXIDES.
`ZnCO_(3)overset(DELTA)toZnO + CO_(2)`
`CuCO_(3)overset(Delta)to CUO + CO_(2)`
`underset(("Dolomite"))(CaCO_(3)), MgCO_(3)overset(Delta)toCaO + MgO + 2CO_(2)`
`2Fe_(2)O_(3).3H_(2)O overset(Delta)to2Fe_(2)O_(3(s)) + 3H_(2)O`


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