C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 9/00 (2006.01) B01D 21/01 (2006.01) C02F 11/12 (2006.01) C02F 11/14 (2006.01)
Patent
CA 2209307
Secondary sludge produced in the produced in the papermaking process is dewatered by adding a material capable of absorbing water together with dry fibers to the secondary sludge, and mixing the secondary sludge with the dried fibers to produce a modified secondary sludge which has sufficient structure and low enough moisture that it may be further dewatered by mechanical means. The preferred fiber adding materials are those readily produced in the papermaking process, particularly dry primary sludge, dried fines and bark and fly ash from boilers.
La boue secondaire obtenue en cours de fabrication du papier est déshydratée en y ajoutant une matière hydrophile en même temps que des fibres sèches et en mélangeant la boue et les fibres séchées de manière à produire une boue secondaire modifiée d'une consistance suffisante et d'une teneur en humidité assez basse pour permettre une déshydratation plus poussée par des moyens mécaniques. Les fibres d'appoint privilégiées sont celles que l'on obtient couramment en cours de fabrication du papier, en particulier la boue primaire sèche, les fines et l'écorce séchées et les cendres volantes provenant du combustible brûlé pour la chauffe des chaudières.
Mconie Robert W.
Rude John E.
Beloit Technologies Inc.
Ridout & Maybee Llp
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