Method of precipitating transition metals and alkaline earth...

Details Method of precipitating transition metals and alkaline earth... Method of precipitating transition metals and alkaline earth...

D - Textiles, Paper

21

C

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

Patent

CA 2203392

Method of precipitating transition metals and alkaline earth metals out of bleaching department spent liquor from a chlorine-free bleaching process, in conjunction with producing lignocellulose-containing pulp, by means of supplying an alkaline liquid, which principally consists of green liquor, white liquor or a combination thereof, to the bleaching department spent liquor.

L'invention concerne un procédé pour précipiter les métaux de transition et les métaux alcalino-terreux dans les effluents sortant d'installations de blanchiment utilisant un procédé sans chlore pour traiter une pâte lignocellulosique. Pour cela, on ajoute à ces effluents un liquide alcalin, constitué essentiellement de lessive verte et/ou de lessive blanche.

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