Apparatus and method for improving density uniformity of a...

B - Operations – Transporting – 03 – B

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B03B 5/46 (2006.01) B03B 4/00 (2006.01) B03B 4/02 (2006.01)

Patent

CA 2090032

An apparatus (10) for providing a fluidized bed (24) to effect the separation of a mixture of articles (58, 60) having at least a first density and a second density that is greater than the first density into separate groups. The apparatus (10) includes an inclined trough (12) which is supplied at an input end (18) with either a fluidization medium, such as sand, or a mixture of articles (58, 60) from which a fluidized bed (24) is formed by forcing gas upwardly through the bottom of the trough and through ~ fluidization medium or the mixture. In the case where a fluidization medium such as sand is used, the mixture of article ~ introduced into the fluidized bed medium so as to be entrained therewith to effect separation as the articles travel in the direction of flow of the fluidized bed medium. Vertical oscillatory movement is imparted to the inclined trough (12) to improve the separation and layering where the mixture of articles is fluidized, or to improve the density uniformity where a fluidization medium such as sand is fluidized as the bed.

Un appareil (10) pour produire un lit fluidisé (24) pour effectuer la séparation, en des groupes distincts, d'articles mélangés (58, 60) ayant au moins une première densité et une seconde densité supérieure à la première. L'appareil (10) comprend une auge inclinée (12) alimentée, à une extrémité d'entrée (18), par soit un milieu de fluidisation comme le sable, soit par un mélange d'articles (58, 60) à partir desquels un lit fluidisé (24) est formé en forçant le gaz vers le haut par le bas de l'auge et à travers le milieu de fluidisation ou le mélange. Si on utilise un milieu de fluidisation comme le sable, le mélange d'articles introduit dans le lit fluidisé de façon à être entraîné avec ce dernier pour que s'effectue la séparation pendant que les articles se déplacent dans la direction du débit du lit fluidisé. Le mouvement oscillatoire vertical est imparti à l'auge inclinée (12) afin d'améliorer la séparation et la structuration en couches où le mélange d'articles est fluidisé, ou pour améliorer l'uniformité de la densité où un milieu de fluidisation tel que le sable est fluidisé comme le lit.

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