Composite for oxidation and corrosion protection of anode...

Details Composite for oxidation and corrosion protection of anode... Composite for oxidation and corrosion protection of anode...

C - Chemistry, Metallurgy

04

B

C04B 7/32 (2006.01) C25C 3/06 (2006.01) C25C 3/12 (2006.01) C25C 7/00 (2006.01)

Patent

CA 2119084

A B S T R A C T A composite material for protecting one or more anode hanger nipples against oxidation and corrosion during operation in a Hall-Heroult electrolysis cell, consisting of a base material in the form of a particle aggregate of waste products from anodes consumed in aluminum electrolysis cells, calcium aluminate cement, a catalyst and water. Substances hazardous to health, such as PAH, have been removed. The composite material is characterised in that the particle aggregate can consist of particles between 1 and 2000 µm and make up at least 80 % of the composite material, the cement up to 15 %, the catalyst 0.6 % and the added water approximately 28 % of the solid mass. The composite material is compressed under pressure to form a collar around the anode hanger nipples and can be prefabricated.

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