Question

difference between roasting and Callington
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Answer 1

Explanation:

Roasting

Calcination

One is heated in the presence of excess of oxygen or air. one is heated in the absence or limited supply of oxygen or air

This method is employed for sulphide ores. This method is employed for carbonate ores.

Sulphur dioxide is produced along with metal oxide. Carbon dioxide is produced along with metal oxide.

Example: For the ores ZnS (sphalerite) and Cu2S (chalcocite), balanced equations for the roasting are:

2ZnS+3O2-->2 Zno+ 2SO2

2 Cu2S + 3O2 → 2 Cu2O + 2 SO2

Example: ZnCO3--> ZnO+ C02

Answer 2

Explanation:

roasting and calcination

roasting is the process of extracting sulphide ores.

calcination is the process of extracting carbonate ores.