Question

what is roasting ? give examples​

Answer 1

Answer:

Roasting Definition: 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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Explanation:

Answer 2

By heating ore above its melting point in the presence of extra air, roasting is a metallurgical process that turns ore into its oxide.

• It is a technique used to transform sulphide ores into the required oxides.
• Moisture and non-metallic contaminants are emitted as volatile gases during roasting.
• Sulphides are a significant source of air pollution in roasting, and the main issue with this process is that it produces a lot of metals as well as poisonous and acidic substances that are bad for the environment.
• Example:

       Roasting ZnS may yield ZnO;

       Roasting HgS may yield free Hg metal.