Identify the correct statement with reference to the extractive metallurgy of aluminium ?
Correct answer: A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
- A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
- B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite
- C. Sodium is deposited along with aluminium, but is immediately vaporised
- D. Anode effect sets in when the cryolite concentration goes below 40%.
Explanation
In the Hall-Héroult process, alumina is dissolved in molten cryolite, typically at about 1 to 8% concentration. Aluminium comes from the alumina, not from cryolite, and the anode effect is associated with depleted alumina concentration.
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