C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/52 (2006.01) B01D 21/01 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01)
Patent
CA 2429476
A method of dewatering an aqueous mineral suspension comprising introducing into the suspension a flocculating system comprising, a) a substantially non- ionic polymeric flocculant and b) an anionic polymeric flocculant, characterised in that, the substantially non-ionic polymeric flocculant is added to the suspension before the addition of the anionic polymeric flocculant. The method is useful for flocculating China clay suspensions, suspensions of s welling clays, calcium carbonate suspensions, titanium dioxide suspensions, suspensions of coal tailings, red mud and phosphate slimes etc.
La présente invention concerne un procédé permettant de déshydrater une suspension minérale aqueuse, selon lequel on introduit dans la suspension un système de floculation comprenant : a) un floculant polymérique sensiblement non ionique ; et b) un floculant polymérique anionique, lequel procédé est caractérisé en ce que l'on ajoute le floculant polymérique sensiblement non ionique à la suspension avant d'ajouter le floculant polymérique anionique. Le procédé de l'invention est utilisé pour la floculation des suspensions de kaolin, les suspensions d'argiles gonflantes, des suspensions de carbonate de calcium, des suspensions de dioxyde de titane, des suspensions de fines de charbon, de boues rouges et de schlamms de phosphate, etc.
Ciba Specialty Chemicals Water Treatments Limited
Fetherstonhaugh & Co.
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