Method and apparatus for extracting liquid from a...

B - Operations – Transporting – 30 – B

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B30B 9/06 (2006.01) B01D 29/25 (2006.01)

Patent

CA 2237521

A method and apparatus for extracting liquid from a liquid-containing slurry. In the preferred embodiment, the apparatus (10) includes a plurality of interconnected press assemblies (12), the outlet (82) of one press assembly (12) being connected to the inlet (92) of a successive press assembly (12). Each press assembly has a foraminous cylindrical container (14), and a two- part piston assembly (18) movable between extended and retracted positions within the foraminous container (14). During operation, a pump (90) continuously feeds slurry under pressure through the inlet of the first press assembly to cause liquid within the first stage slurry upstream of the two- part piston assembly (18) to be radially expressed through the foraminous container (14). After a suitable amount of liquid has been extracted from the first stage slurry, batch processing of the partially dewatered slurry will commence.

Procédé et appareil d'extraction de liquide d'une boue contenant du liquide. Dans le mode de réalisation préféré, l'appareil (10) comprend une pluralité d'ensembles presses (12) interconnectés, la sortie (82) d'un ensemble presse (12) étant reliée à l'admission (92) d'un ensemble presse (12) suivant. Chaque ensemble presse présente un récipient cylindrique foraminé (14) et un ensemble piston (18) à deux parties, mobile entre des positions déployées et rétractées à l'intérieur du récipient foraminé (14). Pendant le fonctionnement, une pompe (90) alimente de façon continue l'admission d'un premier ensemble presse en boue sous pression afin d'exprimer radialement le liquide se trouvant dans la boue de la première phase, en amont de l'ensemble piston (18) à deux parties, à travers le récipient foraminé (14). Lorsqu'une quantité appropriée de liquide a été extraite de la boue de la première phase, un traitement par lots de la boue partiellement déshydratée commence.

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