Differentiate between roasting and calcination.

1.	Differentiate between roasting and calcination.
Answer» Roasting- Roasting is the process of converting an ore into its metallic oxide by heating strongly temperature insufficient to melt in excess of air. 4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂ 2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂ 2ZnS + 3O₂ → 2ZnO + 2SO₂; S + O → SO₂↑ Calcination- Calcination is the process in which concentrated ore is heated strongly is the presence of a limited supply of air in a rever beratory furnance. By doing so moisture is removed and impurities escape as their volatile oxides. CaCO₃ → CaO + CO₂; Al₂O₃.2H₂O → Al₂O₃ +2H₂O 2Al(OH)₃ → Al₂O₃ + 3H₂O CuCO₃Cu(OH)₂ → 2CuO +H₂O +CO₂

Answer»

Roasting-

Roasting is the process of converting an ore into its metallic oxide by heating strongly temperature insufficient to melt in excess of air.

4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂

2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂

2ZnS + 3O₂ → 2ZnO + 2SO₂; S + O → SO₂↑

Calcination-

Calcination is the process in which concentrated ore is heated strongly is the presence of a limited supply of air in a rever beratory furnance. By doing so moisture is removed and impurities escape as their volatile oxides.

CaCO₃ → CaO + CO₂; Al₂O₃.2H₂O → Al₂O₃ +2H₂O

2Al(OH)₃ → Al₂O₃ + 3H₂O

CuCO₃Cu(OH)₂ → 2CuO +H₂O +CO₂

Discussion

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