Calcination is a process of converting carbonaataes and hydroxide ores of metals to their respective oxides by hearting them , stongly below their melting points either in absence or limited supp,y of air
`Fe_(2)O_(3) .3H_(2)O overset(Delta)to Fe_(2)O_(3)+3H_(2)O`
`CaCO_(3) Mg CO_(3) overset(Delta )to CaO +MgO+2CO_(2)`
`CuCo_(3).Cu (OH)_(2)overset(Delta) to 2CuO +H_(2)O+Co_(2)`
`ZnCO_(3)overset(Delta) to ZnO+CO_(2)`
Roasting is a process of converting sulide ores into its metallic oxides by heating strongly below its melting point in excess of air .
`2Zns+3O_(2 ) to 2ZnO+2SO_(2) uarr `
`2PbS+3O_(2) to PbO+2SO_(2)uarr`
