Calcination is the process in which :
(a) ore is heated above its melting point to expel H₂O or
CO₂ or SO₂
(b) ore is heated below its melting point to expel volatile
impurities
(c) ore is heated above its melting point to remove S, As
and Sb as SO₂ ,AS₂O₃ and Sb₂O₃ respectively
(d) ore is heated below its melting point to expel H₂O or
CO₂
Answers
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Calcination is the process in which: the ore is heated below its melting point to expel volatile impurities
- Option (b) is correct.
- Calcination is defined as the process of converting ore into an oxide by heating it strongly(to a high temperature).
- The ore is heated below its melting point either in absence of air or in limited supply.
- Then the ore becomes porous.
Answered by
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Ore is heated below its melting point to expel H₂O or CO₂.
Explanation:
- Calcination is the process of heating of the ore to turn the ore dry and convert the carbonates or sulphates to oxides.
- Calcination is done in absence of Air.
- Calcination also causes thermal decomposition of carbonates and sulphates.
- In case of limestone, calcium carbonate turns into lime and carbon dioxide evolves out of the furnace.
- The ore also turns dry as water evolves out of the ore and ore becomes dry and porous.
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