Layered agglomerated iron ore pellets and balls

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 1/14 (2006.01) B22F 9/00 (2006.01) B32B 15/02 (2006.01) B32B 15/18 (2006.01) C22B 1/24 (2006.01)

Patent

CA 2560085

A layered iron ore ball has a core portion and a shell portion covering the core portion. The core portion contains a first iron-oxide concentrate and is internal fuel additive free. The shell portion contains a second iron-oxide concentrate and at least one internal fuel additive added to the second iron- oxide concentrate. The layered iron ore balls reduce the induration energy costs and increase induration productivity while obtaining good quality fired pellets. Such pellets are used for reduction in the ironmaking process.

L'invention concerne des boulettes de minerai améliorées qui permettent de réduire les coûts énergétiques du durcissement tout en obtenant des granules affinées de bonne qualité. Les granules précitées sont utilisées pour la réduction lors du processus de fabrication du fer. Une boulette de minerai de fer à couches comprend une partie noyau et une partie coquille qui entoure la partie noyau. La partie coquille contient un premier concentré d'oxyde de fer et est dépourvue d'additif de combustible interne. La partie coquille contient un second concentré d'oxyde de fer et au moins un additif de combustible interne qui est ajouté au concentré d'oxyde de fer.

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