Method and device for treating particulate material

Details Method and device for treating particulate material Method and device for treating particulate material

C - Chemistry, Metallurgy

21

B

C21B 13/00 (2006.01) F27D 25/00 (2010.01) B04C 5/00 (2006.01) B04C 5/22 (2006.01) F27B 15/00 (2006.01) F27D 17/00 (2006.01)

Patent

CA 2450688

The invention relates to a method for treating, preferably for reducing, particulate material in at least one fluidization zone at an increased temperature, particularly for reducing ore dust. According to the method, the particulate material is held in the fluidization zone by a treatment gas that flows upward from the bottom, and fine-particulate material, which is transported out of the fluidization zone with the treatment gas is separated from the treatment gas in a separating zone. To this end, the following steps are carried out in the separating zone: feeding the stream, which consists of treatment gas and of transported fine-particulate material, to a separating device (8); separating the fine-particulate material from the treatment gas, whereby the treatment gas is extracted from the separating device as waste gas, and; withdrawing the separated fine-particulate material out of the separating device (8). The invention also relates to a device for carrying out the method. Coarse grained material is introduced into the separating zone whereby reducing the amount of baked on material and deposits thereof.

La présente invention concerne un procédé destiné au traitement, de préférence à la réduction, de matière particulaire dans au moins une zone de fluidisation à température élevée, et destiné notamment à la réduction de fines de minerai. Selon l'invention, la matière particulaire est maintenue dans la zone de fluidisation par un gaz de traitement circulant de bas en haut, et la matière particulaire sortant de la zone de fluidisation avec le gaz de traitement est séparée du gaz de traitement dans une zone de séparation, les étapes suivantes se déroulant dans la zone de séparation: apport du courant constitué de gaz de traitement et de matière particulaire à extraire dans un dispositif de séparation (8); séparation de la matière particulaire du gaz de traitement, le gaz de traitement étant extrait du dispositif de séparation en tant que gaz d'échappement; et évacuation de la matière particulaire séparée du dispositif de séparation (8). L'invention a également pour objet un dispositif permettant la mise en oeuvre du procédé. Dans la zone de séparation est introduite de la matière à particules grossières, ce qui permet d'éviter l'adhérence et la formation de dépôts.

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