Method for producing elongated carbon bodies

Details Method for producing elongated carbon bodies Method for producing elongated carbon bodies

H - Electricity

05

B

H05B 7/09 (2006.01)

Patent

CA 2328702

The present invention relates to a method for continuous production of elongated carbon bodies, particularly carbon electrodes which are produced in direct connection with the smelting furnace wherein the electrodes are consumed, where a metallic casing containing unbaked carbonaceous electrode paste comprising a particulate solid carbon material and a carbonaceous binder is continuously or substantially continuously lowered through a baking furnace which is heated to a temperature between 500 and 1200 ~C, whereby the unbaked electrode paste is baked into a solid carbon body and where the casing is extended by joining new sections of casing on the top of the casing as the casing is lowered through the baking furnace, where the lower part of each section of casing has an outer diameter that is equal to or smaller than the inner diameter of the upper part of each section of casing, said method being characterized in that each new section of casing is mounted upon the section of casing below in such a way that the lower part of the new section of casing is positioned inside the casing of the upper part of the section of casing situated below the new section of casing and where the length of the lower part of each section of casing has such an extension that the new section of casing during baking freely can slide downwards in relation to the section of casing situated below the new section of casing a distance which at least compensates for the shrinkage of the electrode paste contained in the casing during baking of the carbon body in the baking furnace.

L'invention porte sur un procédé de production en continu de corps en carbone allongés, notamment d'électrodes en carbone produites directement du four de fusion. Une enveloppe métallique contenant une pâte carbonée non cuite, constituée d'un matériau en carbone, solide, particulaire et d'un liant carboné, est réduite en continu ou pratiquement en continu dans un four de cuisson chauffé à une température comprise entre 500 et 1200 ·C. La pâte d'électrode non cuite est cuite dans un corps en carbone solide, l'enveloppe étant agrandie par l'assemblage de nouvelles sections sur sa partie supérieure au moment où elle est réduite dans le four de cuisson. La partie inférieure de chaque section de l'enveloppe a un diamètre externe égal ou inférieur au diamètre interne de la partie supérieure de chaque section. Ce procédé se caractérise en ce que chaque nouvelle section de l'enveloppe est montée sur la section se trouvant en dessous de sorte que la partie inférieure de la nouvelle section soit positionnée à l'intérieur de l'enveloppe dans la partie supérieure de la section située en dessous de la nouvelle section. La longueur de la partie inférieure de chaque section de l'enveloppe a une extension telle que la nouvelle section, lors de la cuisson, peut glisser librement vers le bas par rapport à la section de l'enveloppe située en dessous de la nouvelle section à une distance qui compense au moins le rétrécissement de la pâte d'électrode contenue dans l'enveloppe lors de la cuisson du corps en carbone.

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