C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/56 (2006.01) C02F 11/14 (2006.01)
Patent
CA 2558143
A process of dewatering an aqueous suspension employing a flocculating system comprising treating the suspension with a flocculating amount of a first flocculant and a dewatering amount of a second flocculant, and subjecting the suspension to mechanical dewatering to form a cake, wherein the first flocculant brings about flocculation and assists thickening of the suspension and the second flocculant further dewaters the suspension, characterised in that the second flocculant is a water-soluble or water swellable polymer that is mixed into the suspension in the form of aqueous composition comprising dissolved or hydrated polymer having a Brookfield viscosity of above 30,000 cps (measured at 20~C).
L'invention concerne un procédé de déshydratation d'une suspension aqueuse au moyen d'un système floculant consistant à traiter la suspension au moyen d'une quantité floculante d'un premier floculant et d'une quantité déshydratante d'un second floculant et à soumettre la suspension à une déshydratation mécanique, de manière à former un gâteau, le premier floculant entraînant la floculation et contribuant à l'épaississement de la suspension et le second floculant déshydratant encore la suspension, caractérisé en ce que le second floculant est un polymère hydrosoluble ou gonflant dans l'eau mélangé dans la suspension sous la forme d'une composition aqueuse comprenant un polymère dissout ou hydraté possédant une viscosité de Brookfield supérieure à 30,000 cps (mesurée à 20?·¿C).
Norman Peter
Smith Darryl
Whittaker Tony
Ciba Specialty Chemicals Water Treatments Limited
Fetherstonhaugh & Co.
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