Device for and method of separating particles

B - Operations – Transporting – 03 – C

Patent

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Details

B03C 7/00 (2006.01) B03C 7/06 (2006.01)

Patent

CA 2578339

A device (32) is provided for separating particles in a material (34), the particles having different conductivities. The device (32) comprises a feeder (36) for accommodating the material (34), the feeder (36) defining an outlet opening (38). Charging means (40) is located within the feeder (36) and proximate the opening (38) of the feeder (36), the charging means (40) being arranged to directly charge the particles. The device (32) further includes a rotatable drum (42) that is located adjacent the opening (38) of the feeder (36). In use, the charging means (40) is arranged to produce a cloud of similarly charged particles that leave the feeder (36) via the opening (38) and land on the drum (42) substantially as a monolayer, with conductive particles (48) subsequently losing their charge to the drum (42) and thus falling off, while the insulative/less conductive particles (50) remain charged and thus attracted to the surface of the drum (42) so as to be removed further on in the rotation of the drum (42).

L'invention concerne un dispositif (32) de séparation de particules dans un matériau (34), ces particules étant de conductivités différentes. Le dispositif (32) comprend des moyens d'alimentation (36) destinés à recevoir le matériau (34), ces moyens d'alimentation (36) définissant une ouverture d'entrée (38). Des moyens de chargement (40) sont disposés dans les moyens d'alimentation (36) et à proximité de ladite ouverture (38), les moyens de chargement (40) étant agencés pour charger directement les particules. Le dispositif (32) comprend en outre un tambour rotatif (42) monté adjacent à l'ouverture (38) des moyens d'alimentation (36). En cours d'emploi, les moyens de chargement (40) sont agencés de manière à produire un nuage de particules identiquement chargées qui quittent les moyens d'alimentation (36) via l'ouverture (38) et se déposent sur le tambour (42) sensiblement sous forme d'une monocouche, les particules conductrices (48) perdant subséquemment leurs charges sur le tambour (42) et, de ce fait, se détachant, cependant que les particules isolantes / moins conductrices (50) demeurent chargées et sont ainsi attirées à la surface du tambour (42), de sorte qu'elles continuent d'être éliminées par rotation du tambour (42).

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