Method of reusing fillers and coating pigments used in...

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/01 (2006.01) D21F 1/66 (2006.01) D21H 17/67 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2250475

The present invention relates to a process for recycling fillers and coating pigments from the preparation of paper, paperboard and cardboard found in the residual water sludges from coating plant waste waters, deinking plants, internal water treatment plants or separators, and to the use of a thus obtained pigment slurry for the preparation of a coating compound for the paper industry or in the paper stock for papermaking. An essential element of the invention is a process for recycling fillers and coating pigments from the preparation of paper, paperboard and cardboard found in the residual water sludges from coating plant waste waters, deinking plants, internal water treatment plants or separators, characterized in that the residual water sludges containing the fillers and coating pigments are subjected to mixing and then milling together with fresh pigments or fresh fillers in the form of powders, fresh-pigment containing slurries and/or fresh-filler containing slurries to yield a pigment slurry.

L'invention concerne un procédé de réutilisation de charges et de pigments de couchage utilisés dans la fabrication de papier et de carton et provenant des boues d'eaux résiduelles de processus d'enduction, d'installations de désencrage, de stations d'épuration propres aux entreprises ou de dispositifs de séparation. L'invention concerne en outre l'utilisation d'un coulis de pigment ainsi produit pour former une matière de couchage pour l'industrie du papier ou pour servir de constituant dans la fabrication de papier. L'invention se caractérise notamment par un procédé de réutilisation de charges et de pigments de couchage utilisés dans la fabrication de papier et de carton et provenant de boues d'eaux résiduelles de processus d'enduction, d'installations de désencrage, de stations d'épuration propres aux entreprises ou de dispositifs de séparation. Ce procédé se caractérise en ce que les boues d'eaux résiduelles contenant les charges et les pigments sont d'abord acheminées sous forme de poudre ou de coulis contenant du pigment frais et/ou une charge fraîche, jusqu'à un poste de mélange, puis jusqu'à un poste de broyage, afin de former un coulis de pigment comprenant du pigment frais ou une charge fraîche.

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