Electrolyte treatment for aluminum reduction
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United States of America Patent
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Dec 24, 2002
Grant Date -
N/A
app pub date -
Nov 25, 2000
filing date -
Feb 11, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of treating an electrolyte for use in the electrolytic reduction of alumina to aluminum employing an anode and a cathode, the alumina dissolved in the electrolyte, the treating improving wetting of the cathode with molten aluminum during electrolysis. The method comprises the steps of providing a molten electrolyte comprised of ALF.sub.3 and at least one salt selected from the group consisting of NaF, KF and LiF, and treating the electrolyte by providing therein 0.004 to 0.2 wt. % of a transition metal or transition metal compound for improved wettability of the cathode with molten aluminum during subsequent electrolysis to reduce alumina to aluminum.
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