B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 37/02 (2006.01) B01D 33/073 (2006.01) D21F 1/66 (2006.01)
Patent
CA 2188885
The present invention relates to a method and system for recovering fibres by means of a filter surface (1) from white water (2), in which auxiliary pulp (3) is added to the white water to recover fines. The filter surface is at first brought into contact with pulp of higher consistency containing more auxiliary pulp and a filtering fibre layer having longer fibres than the fines is formed from the auxiliary pulp onto the filter surface. Subsequently, the filter surface is transferred to a zone containing more white water. The fibre layer filters fines and other fine particles from the white water.
Procédé et système de récupération de fibres à partir de l'eau blanche (2) au moyen d'une surface de filtre (1), une pâte auxiliaire (3) étant ajoutée à l'eau blanche afin de récupérer les fines. Dans un premier temps, on met la surface de filtre (1) en contact avec une pâte de consistance plus élevée renfermant davantage de pâte auxiliaire, et on forme sur la surface de filtre une couche fibreuse filtrante dont les fibres sont plus longues que les fines. Ensuite, on transfère la surface de filtre dans une zone contenant davantage d'eau blanche. La couche fibreuse extrait par filtrage de l'eau blanche les fines et les autres particules fines.
A. Ahlstrom Corporation
Andritz-Ahlstrom Oy
Gowling Lafleur Henderson Llp
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