Carbon bodies resistant to deterioration by oxidizing gases

Details Carbon bodies resistant to deterioration by oxidizing gases Carbon bodies resistant to deterioration by oxidizing gases

1997-09-15

1999-11-16

Bell, Bruce F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204294, 2042431, 502101, 502120, 502127, 427113, 4274301, C25B 1100

Patent

active

059851147

ABSTRACT:
A carbon body, in particular a pre-baked anode of an electrolytic cell for the production of aluminium by the electrolysis of alumina in a molten fluoride electrolyte is treated over its surfaces to improve the resistance thereof to deterioration during operation of the cell by air and oxidizing gases released at the anode, by treating the body with a treating liquid comprising a precipitable boron-containing compound and an additive, said additive being present in an amount so that substantially no separate phase from said the precipitate of said boron-containing compound is formed upon curing. Suitable boron oxide additives include colloidal alumina, silica, yttria, ceria, thoria, zirconia, magnesia, lithia, monoaluminium phosphate, cerium acetate and mixtures thereof. The same treatment can also be applied to a carbon mass forming a Soderberg anode and to cell sidewalls.

REFERENCES:
patent: 5364513 (1994-11-01), Sekhar et al.
patent: 5486278 (1996-01-01), Manganiello et al.
patent: 5753382 (1998-05-01), Sekhar et al.
"The Reactivity of Carbon Electrodes and Its Dependence on Inorganic Catalysts and Inhibitors" by Gosta Wranglen from Jernkont.Ann.142 (1958):10 No month available.

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