Method for treating process water

Details Method for treating process water Method for treating process water

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2322209

The present invention relates to a method for treating process water containing metal ions, in connection with bleaching of lignocellulosic pulp. According to the invention, the method is characterised by the steps of a) adjusting the Mg2+ content of the process water to form a flocculating base for metals and an organic substance; b) supplying a carbonate source (10) to the process water to precipiate calcium as calcium carbonate; c) increasing the pH of the process water by adding white liquor (11) to precipipate metals such as metal hydroxides; d) adding a flocculating agent (12, 13) to the process water; and e) separating the precipitated, flocculated metal compounds (16) from the process water (17) by flotation.

La présente invention concerne un procédé de traitement d'eaux de traitement renfermant des ions métalliques, associé au blanchiment de pâte lignocellulosique. Selon l'invention, ce procédé se caractérise par les opérations consistant (a) à réguler la teneur en Mg?+¿ de l'eau de traitement afin de former une base de floculation pour métaux et une substance organique, (b) à amener une source de carbonate (10) dans l'eau de traitement pour précipiter le calcium sous forme de carbonate de calcium, (c) à augmenter le pH de l'eau de traitement par ajout de liqueur blanche (11) pour précipiter des métaux tels que des hydroxydes métalliques, (d) à ajouter à l'eau de traitement un agent de floculation (12, 13), et (e) à séparer par flottation les composés métalliques floculés et précipités (16), de l'eau de traitement (17).

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