Method and apparatus for mixing

B - Operations – Transporting – 01 – F

Patent

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B01F 7/22 (2006.01)

Patent

CA 2710213

An apparatus and method for mixing a liquid having particulate includes a vessel for containing the liquid and an axial impeller rotating about a substantially vertical axis. The impeller is adapted for submerging below the liquid surface by a distance approximately one- quarter to one-half of the height of the liq-uid. The impeller is oriented upwardly to produce (a) an inner, upward flow region located along the vertical axis of the vessel, (b) a transition flow region above the impeller in which liquid moves radially outwardly toward the vessel sidewall, and (c) an outer, downward flow region located along the sidewall. The impeller spins at a variable speed, such that the flow is capable of entraining solid particles having a settling velocity of up to approximately 1 foot per minute in the liquid, and the speed of the impeller is chosen to enable particles having a desired settling velocity to settle to the vessel bottom.

L'invention concerne un appareil et un procédé permettant de mélanger un liquide ayant des particules; elle concerne un récipient qui contient le liquide et une turbine axiale qui tourne autour d'un axe sensiblement vertical. La turbine est destinée à s'immerger sous la surface liquide approximativement à un quart à la moitié de la hauteur du liquide. La turbine est orientée vers le haut de façon à produire (a) une région d'écoulement interne située le long de l'axe vertical du récipient, (b) une région d'écoulement de transition au-dessus de la turbine dans laquelle le liquide se déplace radialement vers l'extérieur en direction de la paroi latérale du récipient, et (c) une région externe d'écoulement vers le bas située le long de la paroi. La turbine tourne à une vitesse variable, de façon que l'écoulement entraîne des particules solides ayant une vitesse de décantation atteignant approximativement un pied par minute dans le liquide, et la vitesse de la turbine est choisie de façon à permettre aux particules ayant une vitesse de décantation recherchée de se déposer au fond du récipient.

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