Process for manufacturing molten metal iron

C - Chemistry – Metallurgy – 21 – B

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C21B 13/10 (2006.01)

Patent

CA 2374703

A process comprising: charging a raw material compacting substance containing a carbonaceous reducing agent and an iron oxide contained substance into a moving hearth type furnace; reducing the raw material compacting substance to a reducing ratio 30 to 80 % within the reducing furnace to thereby form a shell formed of metal iron or forming a state that a shell formed of metal iron or metal iron are stretched around in a network fashion and a carbonaceous reducing agent remains in a clearance therebetween; agglomerating produced slag containing FeO therein; charging the compacting substance reduced into a melting furnace in a state maintaining a high temperature, and carrying out final reducing and melting to obtain molten metal iron.

L'invention concerne un procédé consistant à charger une substance de compactage formant la matière première qui contient un agent réducteur carboné et une substance contenant de l'oxyde de fer dans un four à sole en mouvement, à réduire la substance de compactage formant la matière première à un taux de réduction de 30 à 80 % dans le four réducteur, de manière à former une enveloppe de fer métallique ou à former une enveloppe dans laquelle le fer métallique se présente sous la forme d'un réseau, l'agent réducteur carboné restant dans les espaces libres du réseau, à agglomérer le laitier produit comportant du FeO, à charger la substance de compactage réduite dans un four de fusion à haute température, et à réaliser une réduction et une fusion finales afin d'obtenir du fer métallique fondu.

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