Question

When limestone is heated, $CO_2$ is given off. The metallurgical operation is

• A. Smelting
• B. Reduction
• C. Calcination
• D. Roasting

Answer 1

Answer: (C)

Calcination

Answer 2

Calcination is the process of converting an ore into its oxide by heating it strongly below its melting point either in absence or limited supply of air. Carbonate ores are converted into their respective oxides by loss of carbon dioxide.

$CaCO _{3} {->[{\Delta}]} \underset {\text {Calcium oxide }}{CaO} + CO _{2} \uparrow$