Question

what is calcination and roasting

Answer 1

Roasting is a pyrochemical process in which the ore is heated in the presence of oxygen or air is below its melting point. ... roasting is done in reverberatory furnace. Ex:-2ZnS+3O2 ----> 2ZnO+SO2. Calcination is also a pyrochemical process in which ore is heated in the absence of air.the is decomposed in this process.
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Answer 2

                     → Calcination  and Roasting ←

⇒Definition of Calcination : The process of heating carbon ore in the absence of air is known as calcination.

⇒Definition of Roasting : The process of heating sulphide ore in the presence of air is known as roasting.

⇒Extra Information :      The concentrated ore is first calcined and then roast in the excess of air. The following changes take place :-

(a) Water and carbon dioxide are expelled.

(b) Impurities of sulphur and arsenic are removed as volatile oxides.

c) Ferrous oxide is oxidised to Fe₂O₃.

          → 4 Fe O  +    O₂   ⇒   2 Fe₂O₃

(d) The oxide ore becomes porous.

       

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