Light weight sprayable tundish lining composition

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/043 (2006.01) B22D 41/02 (2006.01) C04B 35/66 (2006.01) C04B 38/08 (2006.01)

Patent

CA 2216876

Tundishes and ladles used in processing molten metals and alloys frequently contain both as permanent and disposable linings. The disposable lining acts as a thermal and chemical barrier to protect the permanent lining. However, the presence of alkali in the disposable lining results in a tendency to bond to the permanent lining making removal of the disposable lining difficult. The present invention provides a disposable lining material comprising: a basic refractory aggregate comprising magnesia, magnesite, olivine, doloma, dolomite, calcia, or mixtures thereof; and at least one density reducing material comprising hollow ceramic microspheres in an amount sufficient to reduce the density of the composition.

Les paniers et des poches de coulée utilisés dans le traitement de métaux et alliages fondus sont fréquemment pourvus de garnissages permanents et jetables. Le garnissage jetable joue le rôle de barrière thermique et chimique, ce qui protège le garnissage permanent. Toutefois, la présence d'alcalis dans le garnissage jetable a tendance à fixer celui-ci au garnissage permanent et à rendre sont retrait difficile. La présente invention porte sur un matériau de garnissage jetable comprenant: un agrégat de matériaux réfractaires basiques constitués de magnésie, magnésite, olivine, dolomite calcinée, dolomite, oxyde de calcium ou des mélanges de ceux-ci; et au moins un matériau de réduction de densité comprenant des microsphères céramiques creuses en quantité suffisante pour réduire la densité de la composition.

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