Supply of washing liquid in a fractionating multi-stage washer

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/06 (2006.01) D21C 9/02 (2006.01) D21C 9/08 (2006.01)

Patent

CA 2231551

The present invention relates to a method and an apparatus for intensifying washing of pulp in various washing apparatus. The method and apparatus of the invention are particularly well applicable in connection with the so-called Drum Displacer washers, DD washers, by A. AHLSTROM CORPORATION, and also in some wash presses. The method of effecting displacement wash of pulp, comprising feeding the pulp to be washed to a single-stage or a multi-stage washing system, washing the pulp therein and discharging the pulp from the system, and feeding wash liquid to the system, and discharging at least one filtrate from the system, is characterized in that at least a portion of the filtrate from a suction, press and/or thickening stage following the wash itself is guided to the preceding wash/washing stage to serve as wash liquid.

L'invention concerne un procédé et un appareil utilisés pour intensifier le lavage de la pâte à papier dans divers dispositifs de lavage. Le procédé et l'appareil selon l'invention conviennent particulièrement aux tambours laveurs à déplacement, notamment ceux fabriqués par A. Ahlstrom Corporation, et également dans certaines presses de lavage. Le procédé permettant d'assurer le lavage par déplacement de la pâte à papier et consistant à envoyer la pâte à papier à laver dans un système de lavage à étage unique ou à étages multiples, à y laver la pâte à papier et à la décharger dudit système, à envoyer un liquide de lavage dans le système, et à décharger au moins un filtrat de ce dernier, se caractérise en ce qu'au moins une partie du filtrat provenant d'un presse aspirante et/ou de l'étage d'épaississement suivant le lavage lui-même est renvoyée dans l'étage de lavage précédent pour servir de liquide de lavage.

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