Process for making paper and cardboard

Details Process for making paper and cardboard Process for making paper and cardboard

D - Textiles, Paper

21

H

D21H 17/66 (2006.01) C02F 1/52 (2006.01) C02F 3/28 (2006.01) C02F 3/34 (2006.01) C02F 9/00 (2006.01) D21H 17/62 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2169570

Process for making paper and cardboard, wherein at least one nitrate or basic nitrate of a trivalent metal is used as sizing agent, so that the process wastewater, after a biological denitrification treatment, can be discharged into the environment without causing pollution problems and/or can be reused at least partially as fresh water, with great savings in consumption.

L'invention se rapporte à un procédé de fabrication de papier et de carton, selon lequel on utilise au moins un nitrate ou un nitrate basique d'un métal trivalent en tant qu'agent d'encollage, de manière à pouvoir, après traitement consistant à dénitrifier biologiquement les eaux usées du procédé, rejeter celles-ci dans la nature sans provoquer de problème de pollution, et/ou les réutiliser au moins partiellement comme eau douce, réalisant ainsi de grandes économies de consommation d'eau.

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