A method of separating metal ions from pulp

D - Textiles – Paper – 21 – C

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D21C 9/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2173735

A method of separating metal ions from pulp of lignocellulose-containing material. A main flow (1) of the pulp is treated with chelating agent (12) and washed (3) prior to the bleaching (5) of the pulp with hydroperoxide or ozone. Process water (4) washed out at the washing (3) and containing metal ions is mixed with pulp, which is not lateron to be bleached with hydroperoxide or ozone at pH above 7, whereby the metal ions substantially are bound to this pulp. Thereafter a liquid phase (9, 17) substantially free of metal ions is washed out of this pulp. Thereafter pH in this pulp is lowered to below 3 whereby the main part of the metal ions is released from the pulp and washed out.

Procédé de séparation des ions métalliques d'avec la pâte de matière lignocellulosique. Un flux principal (1) de pâte est traité avec un agent de chélation (12) puis lavé (3) avant que la pâte ne soit blanchie (5) par un hydroperoxyde ou à l'ozone. L'eau de traitement (4) ayant servie au lavage (3) et contenant des ions métalliques est ensuite mélangée à la pâte, à un pH supérieur à 7, non destinée à être blanchie par un hydroperoxyde ou à l'ozone, ce qui a pour effet de fixer majoritairement les ions métalliques à cette pâte. On peut ensuite tirer de cette pâte une phase liquide (9, 17) sensiblement exempte d'ions métalliques. On abaisse ensuite le pH de cette pâte à moins de 3 puis la majeure partie des ions métalliques en est extraite et éliminée par lavage.

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