Stabilised aluminosilicate slurries

C - Chemistry – Metallurgy – 01 – B

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C01B 39/02 (2006.01) C01B 39/14 (2006.01) C01B 39/22 (2006.01) C11D 3/12 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2565696

An aqueous slurry comprises (a) a crystalline aluminosilicate represented by the empirical formula M2/nO . A12O3 . xSiO2 . yH2O wherein M represents a first metal moiety, said first metal having a valency of n, x is the molar ratio of silica to alumina and y indicates the molar ratio of water to alumina, (b) a mineral or organic acid, and (c) particulate silica. The silica may have a BET surface area greater than 500 m2/g and a pore volume, as measured by nitrogen manometry of less than 2.1 cm3/g. The slurry is stable on storage but has a low viscosity at low shear rate.

Cette invention concerne une suspension aqueuse comprenant (a) un aluminosilicate représenté par la formule empirique M¿2/n?O . A1¿2?O¿3? . xSiO¿2? . yH¿2?O dans laquelle M représente une fraction d'un premier premier métal, ledit premier métal ayant une valence de n, x correspond au rapport molaire entre la silice et l'alumine, et y le rapport molaire eau/alumine, (b) un acide minéral ou organique, et (c) de la silice particulaire. La silice peut avoir une aire spécifique BET supérieure à 500 m?2¿/g et un volume de pores, mesuré par manommétrie à l'azote, inférieur à 2,1 cm?3¿/g. La suspension est stable au stockage, mais présente une faible viscosité à un faible taux de cisaillement.

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