A method for baking or calcination of shaped carbon bodies...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 35/528 (2006.01) C04B 35/14 (2006.01) C04B 35/52 (2006.01) C04B 35/532 (2006.01)

Patent

CA 2192919

The present invention concerns a method for baking or calcination of shaped carbon bodies in a furnace and a packing material for use in the same. In accordance with the method, carbon bodies are burned in a furnace chamber, supported or surrounded by a packing material which is formed from a mixture of a material containing carbon and particles of a material containing silicium oxide such as crushed chamotte stone. In accordance with the method, the baking of the carbon bodies will take place at a greater temparature gradient across the packing joint than previously, which results in greater tar combustion and better utilisation of the energy in the degasified components. Furthermore, a packing material is described that contains a component containing carbon and that also contains particles containing silicium oxide in a homogeneous mixture with the component containing carbon. The component containing carbon can be a granulate such as pellets of a mass that comprises dust containing carbon and a binder of tar/pitch. The dust containing carbon in the mass can be made up of butt filter dust which contains sodium and fluorine. The mass can also contain a powder/dust of amaterial containing silicium oxide such as crushed, ground chamotte stone. The present invention results in that materials/substances currently dumped, now can be reused for the baking of carbon bodies within the aluminium industry.

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