Method for pelletization of iron ore

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 1/24 (2006.01) C22B 1/20 (2006.01) F27B 7/20 (2006.01) F27B 7/38 (2006.01) F27B 21/06 (2006.01) F27B 9/10 (2006.01) F27B 9/30 (2006.01) F27D 19/00 (2006.01) F27D 21/00 (2006.01)

Patent

CA 2433853

The invention concerns a method for pelletization of iron ore. Said method is characterised in that it consists in supplying pellets consisting of a mixture of iron ore and additives, forming a bed of said pellets which is displaced in an processing installation comprising a drying zone, a pre-heating zone and a heating zone supplied with counter-current circulation of hot gases and a cooling section arranged at the output of said zones; measuring in said zones or zone portions the temperature of said hot gases; comparing said measured temperatures with predetermined maximum and minimum values; and injecting oxygen, at least in some of said zones for which the measured temperature ranges between the maximum and minimum values, whereby the oxidation of the iron ore is substantially enhanced.

L'invention concerne un procédé de bouletage de minerai de fer. Selon le procédé, on fournit des boulettes constituées par un mélange de minerai de fer et d'additifs, - on forme un lit desdites boulettes qui est déplacé dans une installation de traitement comprenant une zone de séchage, une zone de préchauffage et une zone de chauffage alimentées par une circulation à contre-courant de gaz chauds et une section de refroidissement disposée à la sortie desdites zones; - on mesure dans lesdites zones ou portions de zone la température desdits gaz chauds; - on compare lesdites températures mesurées à des valeurs maximale et minimale prédéterminées; et - on injecte, au moins dans certaines desdites zones pour lesquelles la température mesurée est comprise entre les valeurs maximale et minimale, de l'oxygène, par quoi on améliore sensiblement l'oxydation du minerai de fer.

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