Question

write 3 difference between Roasting & calcination

Answer 1

both calcination and roasting, an ore is converted into its oxide, albeit through different chemical pathway. ... In the process of roastingconcentrated ore is heated strongly, below its melting point, in presence of air with or without some other additives, in order to bring about some desired changes.

Answer 2

$\underline{\large\bf{\mathfrak{Hello!}}}$

⭐ ROASTING ⭐

* Ores are heated in the presence of excess of oxygen or air.

* This method is used for sulphide ore.

* Sulphur dioxide is produced along with metal oxide.

* For example:
2ZnS + 3$O_{2}$ --› 2ZnO + 2$SO_{2}$

⭐ CALCINATION ⭐

* Ores are heated in the absence or limited supply of oxygen or air.

* This method is used for carbonate ore.

* Carbon dioxide is produced along with metal oxide.

* For example:
$ZnCO_{3}$ --› ZnO + $CO_{2}$

$\bf{\mathfrak{Hope \: this \: helps...:)}}$