Dewatering process

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 11/12 (2006.01) B01D 21/00 (2006.01) C02F 1/56 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2558092

A process of dewatering an aqueous suspension comprising dosing the suspension with a flocculating amount of a first flocculant to form a thickened suspension and mixing into the thickened suspension a dewatering amount of a second flocculant and subjecting the thickened suspension to mechanical dewatering to form a cake, characterised in that the second flocculant comprises a water-soluble or water swellable polymer that is mixed into the suspension in the form of (i) substantially dry polymer particles or (ii) an aqueous composition comprising dissolved or hydrated polymer having a polymer concentration of at least 2% by weight and having a intrinsic viscosity of at least 3 dl/g.

L'invention concerne un procédé de déshydratation d'une suspension aqueuse consistant à doser la suspension avec une quantité de floculation d'un premier floculant de manière à former une suspension épaissie et à mélanger dans ladite suspension épaissie une quantité de déshydratation d'un second floculant, et à soumettre ladite suspension épaissie à une déshydratation mécanique afin de former un gâteau. Ledit procédé est caractérisé en ce que le second floculant contient un polymère gonflable dans l'eau ou soluble dans l'eau qui est mélangé dans la suspension sous la forme (i) de particules polymères pratiquement sèches ou (ii) d'une composition aqueuse contenant un polymère dissous ou hydraté qui présente une concentration polymère d'au moins 2 % en poids et une viscosité intrinsèque d'au moins 3 dl/g.

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