Filtering method

Details Filtering method Filtering method

B - Operations, Transporting

01

D

B01D 33/66 (2006.01) B01D 33/048 (2006.01) B01D 33/21 (2006.01) B01D 37/04 (2006.01)

Patent

CA 2430194

The invention relates to a filtration method where the material to be filtered is brought into contact with the filtering surface of a filtering medium arranged in a suction drier, and on the filtering surface for the filtering medium, there is formed a filter cake, and the filter cake is subjected to a drying process constituting at least one step prior to removing the filter cake from the filtering surface of the filtering medium. According to the invention, in the filter cake drying process there is performed at least one drying step (12, 22, 32, 42) during which gas is prevented from flowing through the filtering medium, and at least one drying step (13, 23, 33, 44) during which gas flows through the filtering medium.

L'invention concerne un procédé de filtration dans lequel le matériau à filtrer est amené au contact de la surface filtrante d'un support filtrant disposé dans un sécheur par aspiration, un gâteau de filtration se formant sur la surface filtrante du support filtrant, ce gâteau de filtration étant soumis à un procédé de séchage constituant au moins une étape avant l'enlèvement du gâteau de filtration. Selon l'invention, le procédé de séchage du gâteau de filtration consiste au moins en une étape de séchage (12, 22, 32, 42) durant laquelle on empêche un gaz de passer à travers le support filtrant, et au moins en une étape de séchage (13, 23, 33, 44) durant laquelle on fait passer le gaz à travers le support filtrant.

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