Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1987-11-06
1988-11-29
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204294, 106 1405, 106104, 501100, 501101, 501124, C25C 700
Patent
active
047879653
ABSTRACT:
The invention concerns a coating for providing protection from corrosion and oxidation in the hot state, which coating is intended for the carrier bars of prebaked anodes and the emergent, or exposed, carbonaceous part of said anodes for Hall-Heroult electrolysis tanks, which elements are formed of a composition of carbonaceous aggregate selected from coke, graphite, semi-graphite and electrode scrap, together with calcium aluminate cement having an alumina content which is at least equal to 70% and a total amount of troublesome impurities (SiO.sub.2, Fe.sub.2 O.sub.3, TiO.sub.2, K.sub.2 O, Cr.sub.2 O.sub.3 and Mn.sub.2 O.sub.3) of less than 5% and preferably less than 2%. The protective coating may further comprise an addition of alumina powder in a proportion which can be up to 50% of the weight of the aggregate and an addition of 0.01% to 5% of metal powder such as passivated aluminium powder of a grain size of less than 0.1 mm. The coating may be used in the form of paste or be applied by spray gun.
REFERENCES:
patent: 3846144 (1974-11-01), Parsons et al.
patent: 4246035 (1981-01-01), Maczura et al.
patent: 4318996 (1982-03-01), Magder
Audras Gabriel
Samanos Bernard
Gorgos Kathryn
Refractaires Savoie (SERS)
Societe Des Electrodes
Tung T.
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