Question:
Which of the following is used as a flux in the smelting of Haematite?
Which of the following is used as a flux in the smelting of Haematite?
Updated On: Apr 17, 2025
- SiO2
- CaSiO3
- CaCO3
- FeSiO3
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The Correct Option is C
Solution and Explanation
To solve the problem, we need to identify the substance used as a flux in the smelting of haematite (Fe2O3).
1. Understanding the Role of Flux:
A flux is a substance added during smelting to combine with impurities (gangue) to form a slag. This slag is easily removable.
2. Nature of Gangue in Haematite:
The main impurity present during the smelting of haematite is **silica (SiO2)**, which is acidic in nature.
3. Required Flux:
To remove acidic impurities like SiO2, we use a basic flux. The most commonly used basic flux is **calcium carbonate (CaCO3)**, which decomposes on heating to form CaO. CaO then reacts with SiO2 to form calcium silicate (CaSiO3), which is the slag.
Reaction:
\[
\text{CaCO}_3 \xrightarrow{\Delta} \text{CaO} + \text{CO}_2
\]
\[
\text{CaO} + \text{SiO}_2 \rightarrow \text{CaSiO}_3 \ (\text{slag})
\]
Final Answer:
The correct answer is option (C): CaCO3.
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