Method for producing reduced iron

C - Chemistry – Metallurgy – 21 – B

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C21B 13/10 (2006.01)

Patent

CA 2372378

A method for producing reduced iron comprises agglomerating a raw material mixture containing a carbonaceous reducing agent and an iron oxide-containing material into small agglomerates, heating the agglomerate within a heat reduction furnace, thereby solid reducing the iron oxide in the agglomerate to produce solid reduced iron, or further heating the solid reduced iron, melting the metallic iron produced by the reduction, and coagulating the molten metallic iron while separating the slag component contained in the small agglomerates to provide granular metallic iron, which is characterized by using an agglomerate having a particle size of 10 mm or less or 3-7 mm, preferably less than 6 mm, more preferably 3 mm or more and less than 6 mm as the small agglomerates.

L'invention concerne un procédé de production de fer réduit consistant à agglomérer en petits agglomérats un mélange brut contenant un agent de réduction carboné et un matériau contenant de l'oxyde de fer, à chauffer ces agglomérats dans un four de réduction par chaleur, réduisant ainsi l'oxyde de fer à l'état solide dans l'agglomérat afin d'obtenir du fer réduit solide, ou à chauffer une nouvelle fois le fer réduit solide, à faire fondre le fer métallique obtenu par réduction, puis à coaguler le fer métallique fondu tout en séparant le laitier contenu dans les petits agglomérats afin d'obtenir du fer métallique en grains. Ce procédé est caractérisé par l'utilisation d'un agglomérat dont le calibre est de 10 mm ou moins ou de 3-7 mm, de préférence de moins de 6 mm, idéalement de 3 mm ou plus et de moins de 6 mm comme les petits agglomérats.

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