Pulp washing method and plant

D - Textiles – Paper – 21 – C

Patent

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

Patent

CA 2373695

A method of improving the efficiency of the multistage washing of pulp, wherein the initial washing of a given batch of pulp is carried out using a gradually diluted, recovered filtrate fraction originating from the washing of the preceding batch of pulp as the washing liquid, prior to the final washing of the pulp batch. In the method, the recovered fraction filtrate is kept stored in such a way that the concentration gradient of dissolved substances is maintained until the fraction is used for washing the following batch of pulp. A further object of the invention is a pulp washing plant, wherein the method according to the invention is carried out in a laboratory-scale test washer and applied to industrial pulp washing plant solutions.

La présente invention concerne un procédé qui améliore l'efficacité d'un système multiétagé de lavage de pâte, le lavage initial d'une charge de pâte étant pratiqué à l'aide d'une fraction, diluée par paliers, de filtrat récupéré provenant du liquide de lavage de la précédente charge de pâte, avant le lavage final de la charge de pâte. Selon ce procédé, la fraction de filtrat récupéré est gardée en réserve de manière à ce que le gradient de concentration de substances dissoutes soit maintenu jusqu'à ce que la fraction soit utilisée pour laver la charge de pâte suivante. L'invention concerne également une installation de lavage de pâte, ledit procédé de l'invention étant mis en oeuvre dans un appareil de lavage d'essai en laboratoire et appliqué dans des installations industrielles de lavage de pâte.

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