Improved method for preparing low-concentration...

Details Improved method for preparing low-concentration... Improved method for preparing low-concentration...

C - Chemistry, Metallurgy

01

B

C01B 33/26 (2006.01)

Patent

CA 2289711

An improved method and apparatus for preparing low-concentration polyaluminosilicate microgels from a water soluble silicate and a strong acid in which the silicate and acid are mixed at a rate to produce a Reynolds number of at least 4000, the mixture is aged and then diluted to a silica concentration of not more than 1.0 wt.%. The method achieves reduced silica deposition during the preparation of the microgels.

L'invention concerne un procédé et un appareil améliorés permettant de préparer des microgels à base de polysilicates d'alumine à faible concentration, à partir d'un silicate soluble dans l'eau et d'un acide fort. Le silicate et l'acide sont mélangés dans des proportions permettant d'atteindre un nombre de Reynolds égal ou supérieur à 4000. On fait vieillir le mélange puis on le dilue pour obtenir une concentration de silice inférieure ou égale à 1,0 % en poids. Le procédé permet de réduire le dépôt de silice lors de la préparation des microgels.

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