Improved method and apparatus for the separation of...

B - Operations – Transporting – 03 – B

Patent

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B03B 5/52 (2006.01)

Patent

CA 2214270

A method and apparatus (10) for separating materials having different size densities is described. The apparatus includes a trough (12), a dispersing and conveying screw means (40) and a fluid distribution manifold (26). The trough has upper and lower portions (12F and 12G) with the lower portion forming a pool area. The dispersing and conveying screw means has a conveying portion (46) and a dispersing portion (50). The conveying portion has flights (48) which move the first material (152) up the trough. The dispersing portion has paddles (52) which disperse the mixture (150) and convey the first material to the conveying portion. The fluid distribution manifold supplies both water and air to the inside (12I) of the trough through fluid orifices (28). In operation, the mixture is fed into the trough directly over the fluid orifices and the dispersing portion of the dispersing and conveying screw means. As the mixture enters the trough, the mixture is dispersed and forms an aqueous suspension with the water. The first material settles out of the aqueous suspension and is conveyed up the trough and out the upper discharge spout (14). The second material (154) remains suspended in aqueous suspension and flows over the overflow weir and out the lower discharge spout.

Méthode et appareil (10) pour séparer des matériaux de densités différentes . L'appareil comprend une auge (12), une vis de dispersion et de transport (40) et une tubulure de distribution du liquide (26). L'auge comporte une partie supérieure (12F) et une partie inférieure (12G) qui forme un bassin. La vis de dispersion et de transport est constituée d'une partie où se fait le transport (46) et d'une partie servant à la dispersion (50). La première comprend une vis sans fin transporteuse (48) qui déplace le premier matériau (152) dans l'auge. La seconde comprend des palettes (52) qui dispersent le mélange (150) et transportent le premier matériau vers la partie servant au transport. La tubulure de distribution du liquide alimente l'intérieur (12I) de l'auge en eau et en air par des orifices (28). Pendant le fonctionnement, le mélange entre directement dans l'auge par les orifices et dans la partie servant à la dispersion. Dès son entrée dans l'auge, le mélange est dispersé et forme une suspension aqueuse avec l'eau. Le premier matériau qui se dépose par précipitation est transporté dans l'auge, puis déversé par la goulotte d'évacuation supérieure (14). Le deuxième matériau (154) demeure en suspension et s'écoule par-dessus le déversoir par la goulotte d'évacuation inférieure.

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