Question

State the given statement is true or false.

Statement: In calcination and roasting, volatile impurities are removed.

• A. True
• B. False

Answer 1

The correct option is A True

Volatile impurities are removed in calcination and roasting. During roasting, the volatile impurities are removed and the ore is changed to oxide.

Some chemical changes occur during calcination are:-

1) Moisture is driven out

2) Volatile impurities of S, As and P are removed as their volatile oxides

3) Water is removed from hydrated ores

4) It makes ores porous and hence easily workable in subsequent stages.

Hence, the given statement is $true$.