The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?
Correct answer: A. 2-5
- A. 2-5
- B. 18-20
- C. 12-15
- D. 6-12
Explanation
In the Hall-Héroult cell, alumina is kept dilute in molten cryolite, typically around 2 to 5 percent, to maintain suitable dissolution and electrolysis conditions. Excessively high alumina concentration can cause anode effects and operational problems.
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