Question

define the calcination and roasting process

Answer 1

calcination- The process by which heating ore in the absence of air...

Roasting- The process by which heating ore in the presence of air.


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Answer 2

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$\boxed{Answer :}$

$\boxed{Calcination :}$

Calcination, the heating of solids to a high temperature for the purpose of removing volatile substances, oxidizing a portion of mass, or rendering them friable. Calcination, therefore, is sometimes considered a process of purification.

$\boxed{Roasting :}$

Roasting is a process in metallurgy in which a sulfide ore is heated in air. The process may convert a metal sulfide to a metal oxide or to a free metal. Example:Roasting ZnS may yield ZnO; roasting HgS may yield free Hg metal.

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