Method of purifying gypsum

C - Chemistry – Metallurgy – 01 – F

Patent

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Details

C01F 11/46 (2006.01) B03C 1/00 (2006.01) C04B 11/26 (2006.01) B01D 53/48 (2006.01)

Patent

CA 2720826

The present invention relates to a method of purifying flue gas desulfurization (FGD) gypsum. The method is characterized by comprising the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing said aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below in an acid washing step. The present invention also relates to the purified FGD gypsum obtained by the inventive method and to the use thereof as coating or filler pigment for paper or board.

La présente invention porte sur un procédé de purification de gypse de désulfuration d'un effluent gazeux (FGD). Le procédé est caractérisé par le fait qu'il comprend les étapes consistant à a) obtenir une bouillie aqueuse contenant ledit gypse de FGD, b) faire passer ladite bouillie aqueuse dans un séparateur magnétique et c) mettre en contact le gypse de FGD à purifier avec une solution contenant un acide et ayant un pH inférieur à 5 dans une étape de lavage à l'acide. La présente invention porte également sur le gypse de FGD purifié obtenu par le procédé de l'invention et sur l'utilisation de celui-ci comme pigment de couchage ou de charge pour du papier ou du carton.

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