Method and apparatus for flotation in a fluidized bed

B - Operations – Transporting – 03 – D

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B03D 1/24 (2006.01)

Patent

CA 2677887

Separation of hydrophobic particles from a mixture of particles in a fluid is performed by providing a fluidized bed (18) as a relatively non-turbulent contacting mechanism in a flotation cell incorporating a settling chamber (30) located immediately above the fluidized bed. Hydrophobic particles attach to bubbles in the fluidized bed 18 and rise to the interface (19) with the settling chamber (30) where non-hydrophobic particles (22) flow over the lip (20) of an internal launder and are removed as tailings at (21). The hydrophobic particles attached to bubbles float upwardly in the relatively placid settling chamber (30) where unwanted gangue can fall back to interface (19). The bubbles form a froth layer at the upper surface of the settling chamber, and flow over the launder lip (32) carrying the hydrophobic particles. An operation of the apparatus is kept stable by recirulating fluid from the settling chamber (30) via pipe (40) and pump (41) to mix with new feed entering at duct (2).

Selon l'invention, on sépare des particules hydrophobes d'un mélange de particules dans un liquide en utilisant un lit fluidisé (18) comme mécanisme de contact relativement non turbulent, dans une cellule de flottation comprenant une chambre de sédimentation (30) située immédiatement au-dessus du lit fluidisé. Les particules hydrophobes s'attachent aux bulles du lit fluidisé (18) et s'élèvent jusqu'à l'interface (19) avec la chambre de sédimentation (30), où les particules non hydrophobes (22) s'écoulent par-dessus la lèvre (20) d'une goulotte interne et sont évacuées sous la forme de résidus en (21). Les particules hydrophobes attachées aux bulles flottent vers le haut dans une chambre de sédimentation relativement calme (30) où la gangue peut retomber sur l'interface (19). Les bulles forment une couche d'écume à la surface supérieure de la chambre de sédimentation et s'écoulent par-dessus la lèvre de la goulotte (32), transportant les particules hydrophobes. Une remise en circulation du liquide en provenance de la chambre de sédimentation (30), via un tuyau (40) et une pompe (41) l'amenant à se mélanger au nouveau flux qui pénètre dans la conduite (2), permet de préserver un fonctionnement stable de l'appareil.

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