Plug members for steel furnaces

F - Mech Eng,Light,Heat,Weapons – 27 – D

Patent

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F27D 3/15 (2006.01) B22D 43/00 (2006.01)

Patent

CA 2366544

A dart has a metal bar (1) passing through a ceramic, shaped, dart head (2) and then through a cylindrical ceramic dart stem (3). A sleeve (4) of a carbonaceous or reac- tive material is provided about the stem (3) or a layer of that material can be formed on the lower face (5) of the dart head (2) (at the interface of the steel and slag). A block or sleeve (6) of suitable reactive material could be positioned on the top face (7) of the dart. The reactive material could be cardboard or pa- per, or a reactive metal, such as aluminium or magnesium. In each case a chemical reaction with the molten steel will result in an updraft in the steel which clears slag from the area of the tap hole.

une flèche possède une barre (1) métallique qui passe à travers une tête (2) de flèche de céramique en forme puis à travers une tige (3) de flèche de céramique cylindrique. Une gaine (4) de matériau charbonneux ou réactif recouvre cette tige (3) ou encore, on peut former une couche de ce matériau sur la face antérieure (5) de cette tête (2) de flèche (à l'interface de l'acier et des scories). On pourrait positionner un bloc ou une gaine (6) du réactif adapté sur la face supérieure (7) de cette flèche. Ce matériau réactif pourrait être du carton ou du papier, ou un métal réactif, tel que l'aluminium ou le magnésium. Dans chaque cas une réaction chimique avec l'acier fondu aura pour effet de générer une circulation ascendante dans l'acier qui élimine les scories de la région du trou de coulée.

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