Coating composition for a carbonaceous material, and...

C - Chemistry – Metallurgy – 04 – B

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C04B 41/50 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2210761

A composition for a protective coating on the surface of carbonaceous materials exposed to a hot oxidising medium, e.g. the portions of anodes and edge slabs that are not immersed in the molten salt bath of an aluminium electrolytic cell, and generally the non-immersed portions of carbonaceous refractory elements used in electrolysis performed at under 950 DEG C in a molten salt bath. The composition comprises a geopolymer, preferably from the fluoro-poly(sialate-disiloxo) family, and its other components are optionally water as well as alumina and/or another refractory such as silica. A coating is also provided for protecting the surface of carbonaceous materials exposed to a hot oxidising medium, e.g. the non-immersed portions of carbonaceous refractory elements used in electrolysis performed at under 950 DEG C in a molten salt bath. Said coating comprises polysilicates and at least one inorganic polymer from the poly(sialate) family, preferably the fluoro-poly(sialate-disiloxo) family, and optionally alumina or another refractory such as silica. An aluminium electrolytic cell anode provided with said coating is also disclosed.

Composition pour un revêtement protégeant la surface de produits carbonés exposée à un milieu chaud et oxydant, tels que les parties non immergées dans le bain de sel fondu des anodes et des dalles de bordure des cuves d'électrolyse de l'aluminium et plus généralement les parties non immergées d'éléments réfractaires carbonés utilisés dans une électrolyse s'effectuant à moins de 950 °C en bain de sel fondu, comportant un géopolymère, de préférence de la famille fluoro-poly(sialate- disiloxo), les autres composants étant éventuellement de l'eau ainsi que de l'alumine et/ou un réfractaire autre tel que la silice. Revêtement protégeant la surface de produits carbonés exposée à un milieu chaud et oxydant, tels que les parties non immergées d'éléments réfractaires carbonés utilisés dans une électrolyse s'effectuant à moins de 950 °C en bain de sel fondu, comportant des polysilicates et au moins un polymère minéral de la famille poly(sialate), de préférence fluoro-poly(sialate-disiloxo), ainsi qu'éventuellement de l'alumine ou un autre réfractaire tel que la silice. Anode de cuve d'électrolyse d'aluminium revêtue dudit revêtement.

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