Question

define roasting and calcination​

Answer 1

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.

Calcination:

The IUPAC defines calcination as "heating to high temperatures in air or oxygen". However, calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition.

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Answer 2

Answer:Roasting is a process in metallurgy in which a sulfide ore is heated in air.

Calcination- A thermal treatment process in the absence or limited supply of air or oxygen is applied to

ores and other solid materials to bring out a thermal decomposition.

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