Bath for electrolytic reduction of alumina and method therefor
- Seattle, WA
- Lynnwood, WA
- Bulleen, AU
An electrolytic bath for use during the electrolytic reduction of alumina to aluminum. The bath comprises a molten electrolyte having the following ingredients: (a) AlF.sub.3 and at least one salt selected from the group consisting of NaF, KF, and LiF; and (b) about 0.004 wt. % to about 0.2 wt. %, based on total weight of the molten electrolyte, of at least one transition metal or at least one compound of the metal or both. The compound may be, for example, a fluoride, oxide, or carbonate. The metal can be nickel, iron, copper, cobalt, or molybdenum. The bath can be employed in a combination that includes a vessel for containing the bath and at least one non-consumable anode and at least one dimensionally stable cathode in the bath. Employing the bath of the present invention during electrolytic reduction of alumina to aluminum can improve the wetting of aluminum on a cathode by reducing or eliminating the formation of non-metallic deposits on the cathode.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- DOE Contract Number:
- 310468-A-UF
- Assignee:
- Northwest Aluminum Technology (Dalles, OR)
- Patent Number(s):
- US 6258247
- Application Number:
- 09/247,196
- OSTI ID:
- 873838
- Country of Publication:
- United States
- Language:
- English
Principles of Aluminum Electrolysis
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book | January 2016 |
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electrolytic
reduction
alumina
method
aluminum
comprises
molten
electrolyte
following
ingredients
alf
salt
selected
consisting
naf
kf
lif
004
wt
based
total
weight
transition
metal
compound
example
fluoride
oxide
carbonate
nickel
iron
copper
cobalt
molybdenum
employed
combination
vessel
containing
non-consumable
anode
dimensionally
stable
cathode
employing
improve
wetting
reducing
eliminating
formation
non-metallic
deposits
non-consumable anode
molten electrolyte
transition metal
electrolytic reduction
dimensionally stable
total weight
salt selected
electrolytic bath
bath comprises
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