Method and device for separating heavy particles from a...

B - Operations – Transporting – 07 – B

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B07B 7/08 (2006.01) B07B 7/086 (2006.01) B07B 9/02 (2006.01)

Patent

CA 2164334

In a method for separating heavy particles from a particulate material containing such heavy particles, use is made of a device having a Coanda sifter, which is adapted to receive a flow of the particulate material and which has a downwardly- facing, convexly single-curved surface (9), and a zigzag sifter (13) arranged after the Coanda sifter and having a plurality of zigzag-shaped, vertical walls (14) which are perpendicular to the axis of curvature of the single-curved surface (9) and define between them channels (15) extending upwards in zigzag fashion. The particulate material is transported to the Coanda sifter and is conducted over its convexly single-curved surface (9) to have imparted to it a direction of motion (P1, P2) which is dependent on the weight of the particles and in which the particles are guided into the zigzag sifter (13). The particles are guided into the channels (15) of the zigzag sifter (13) in the lower portions thereof and from the side parallel to the channel walls (14). The particles are transported up through the channels (15) with the aid of a flow of transport air which is so adjusted that the heavy particles are separated in the zigzag sifter (13).

Avec un procédé qui permet de séparer des particules lourdes d'un matériau à particules qui les contient, on utilise un dispositif doté d'un cribleur de Coanda, conçu pour recevoir un flux de matériau à particules et présentant une surface (9) à courbe convexe unique tournée vers le bas, ainsi que d'un cribleur en zigzag (13) placé en aval du cribleur de Coanda et présentant plusieurs parois verticales (14) en zigzag et perpendiculaires à l'axe de courbure de la surface à courbure unique (9), parois qui définissent entre elles des canaux (15) montants en zigzag. Le matériau à particules est transporté vers le cribleur de Coanda et conduit sur sa surface à courbure unique convexe (9) pour se voir conférer une direction de déplacement (P1, P2) dépendant du poids des particules, où ces dernières sont dirigées vers le cribleur en zigzag (13). Ces particules sont guidées vers les canaux (15) du cribleur en zigzag (13), dans sa partie inférieure et à partir du côté parallèle aux parois (14), grâce au flux d'air de transport qui est réglé de façon que les particules lourdes sont séparées dans le cribleur en zigzag (13).

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