Pressure control in direct smelting process

C - Chemistry – Metallurgy – 21 – C

Patent

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Details

C21C 5/38 (2006.01) C21C 5/40 (2006.01) F27D 13/00 (2006.01) F27D 17/00 (2006.01) F27D 19/00 (2006.01)

Patent

CA 2648591

A direct smelting process for producing molten metal from a metalliferous feed material in a direct smelting vessel is disclosed. The process includes using a stream of off-gas from the vessel as a fuel gas in (i) stoves for generating a hot blast of air or oxygen-enriched air for the process and (ii) a waste heat recovery apparatus for generating steam for the process. The process also includes controlling pressure in the vessel by controlling pressure in the off-gas stream while the process is producing molten metal.

L'invention concerne un procédé de fusion directe pour la production de métal en fusion à partir d'un matériau d'alimentation métallifère dans un récipient de fusion directe. Le procédé consiste à utiliser un flux de dégagement gazeux du récipient comme gaz de chauffe dans (i) des étuves pour créer un souffle chaud d'air ou d'air enrichi en oxygène pour le procédé et (ii) dans un appareil de récupération de chaleur perdue pour créer de la vapeur pour le procédé. Le procédé consiste aussi à contrôler la pression dans le récipient par le contrôle de la pression du flux de dégagement gazeux lorsque le procédé produit du métal en fusion.

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