Treating prebaked carbon components for aluminum production, the

Details Treating prebaked carbon components for aluminum production, the Treating prebaked carbon components for aluminum production, the

1994-03-28

1996-01-23

Gorgos, Kathryn

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204290R, 204294, 204 67, 427113, 4271261, 4274301, C25C 700, C25C 308

Patent

active

054862787

ABSTRACT:
A prebaked carbon-based anode of an electrolytic cell for the production of aluminium, in particular by the electrolysis of alumina in a molten fluoride electrolyte, is treated over its sides and top to improve the resistance thereof to erosion during operation of the cell by oxidising gases released at the anode, by immersing the anode in a boron-containing solution containing 5-60 weight % of H.sub.3 BO.sub.3 or B.sub.2 O.sub.3 in methanol, ethylene glycol, glycerin or water with a surface-active agent, e.g. at 80.degree. to 120.degree. C. After 2-60 minutes immersion, the boron-containing solution is impregnated to a depth of 1-10 cm, usually about 2-4 cm over the top and side surfaces of the anode to be protected, producing a concentration of boron in the impregnated surface from 200 ppm to 0.35%. The same treatment can be applied to cell sidewalls.

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