Question

mention the difference between calcination and roasting .how these proses are used in the extaction of zinc ,explain with help off chemical equation ofter prosses is readiction necessary to option zinc why​

Answer 1

Answer:

Roasting vs Calcination

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

Answer 2

Answer:

While calcination is mostly used in the oxidation of carbonates, roasting is a method that is used for converting sulphide ores. During roasting, moisture and non-metallic impurities in the form of volatile gases are released.... An example of roasting is when Zinc sulphide is converted into zinc oxide.

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