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Difference between Calcination and Roasting. 

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Calcination
Roasting
1)Process of heating the ore strongly in absence of air below its M.P
1)Process of heating the ore strongly in presence of air below its M.P.
2)This process is used to convert carbonate & hydroxide into their oxides
2) This process is used to convert sulphide into oxide & sulphate.
3)Purpose is to remove the moisture & volatile impurities from the ore
3)Purpose is to remove moisture & oxidation of ore & the impurities like S,P,As etc.
4)In calcination, the mass becomes highly porous.
4) In roasting, the mass becomes less porous.
5) Process done in hearth of a reverberatory furnace when the doors are kept closed.
5) Process done in hearth of a reverberatory furnace when the doors are kept opened.
6. Decomposition reaction takes place
6.Oxidation reaction takes place

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