C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/56 (2006.01) B01D 21/01 (2006.01) C02F 11/14 (2006.01)
Patent
CA 2326355
A process for dewatering an aqueous suspension of solids which comprises adding to the suspension a flocculation aid, allowing the suspension to flocculate and dewatering the suspension, in which the flocculation aid is an aqueous composition comprising first and second water soluble ionic polymeric flocculants in which the first flocculant is in excess over the second flocculant and the first and second flocculants form particles of counterionic precipitate and substantially all of the proportion of the first flocculant which is not incorporated into the particles of counterionic precipitate is in solution, characterized in that the transfer and dosage conduits are constructed so that substantially none of the particles of counterionic precipitate are broken or dispersed after their formation and before their addition to the suspension.
L'invention concerne un procédé de déshydratation d'une suspension aqueuse de matières solides, consistant à: ajouter à la suspension un adjuvant de floculation, ce qui permet à la suspension de floculer en vue de sa déshydratation. Ledit adjuvant de floculation est une composition aqueuse renfermant un premier et un second floculants polymères ioniques solubles dans l'eau, la quantité de premier floculant étant en excès par rapport à celle du second, le premier et le second floculants formant des particules de précipité d'ions antagonistes, et la quasi-totalité de la partie du premier floculant qui n'est pas contenue dans les particules de précipité d'ions antagonistes se trouvant en solution. L'invention est caractérisée en ce que les conduits de transfert et de dosage sont fabriqués de telle sorte que sensiblement aucune des particules du précipité d'ions antagonistes n'est brisée ou dispersée après sa formation et avant son ajout dans la suspension.
Allen Anthony Peter
Flanagan Ian John
Tippett-Moore Andrew Mark
Ciba Specialty Chemicals Water Treatments Limited
Fetherstonhaugh & Co.
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