In the metallurgy of Al, purified Al2O3 is mixed with Na3AlF6 or CaF2. The role of Na3AlF6 or CaF2 is to:
This question was previously asked in
Shift 27/05/2023 3:30 PM - 6:30 PM
A
1. Decrease the conductivity of Al2O3
B
Lower the melting point of Al2O3
C
Reduce Al2O3
D
Oxidise Al2O3
Correct Answer
Lower the melting point of Al2O3
Detailed Explanation
In the metallurgy of aluminum, purified Al2O3 is mixed with Na3AlF6 or CaF2 to serve as a solvent for alumina (Al2O3). The role of Na3AlF6 or CaF2 is to lower the melting point of the mixture, which allows the electrolysis process to occur at a lower temperature, reducing the energy consumption during the extraction of aluminum. This process is known as the Hall-Héroult process.
The correct answer is:
- Lower the melting point of Al2O3
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