Question

Roasting is defined as:

• A. Heating of sulphide ores in presence of air.
• B. Heating of sulphide ores in absence of air.
• C. Heating of carbonate ores in presence of air.
• D. Heating of carbonate ores in absence of air.

Answer 1

The correct option is A

Heating of sulphide ores in presence of air.

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