Aluminum silicate suspension
AssigneeDegussa-Huls AG
InventorsHolger Glaum, Jürgen Schubert
Life of this patent
Estimating the term…
Abstract
An aqueous aluminium silicate suspension having a content of aluminium silicate of at least 30 wt. % is prepared by liquefaction of the aluminium silicate filter cake or by dispersion of aluminium silicate powder in water with the addition of aluminium silicate powder, surfactant and aluminium sulfate. It can be employed in papermaking.
Claims3
Aqueous aluminum silicate suspension, which comprises, in addition to water, at least 30 wt. % aluminum silicate, 0.1 to 3.0 wt. % aluminum sulfate and 0.1 to 5.0 wt. % surfactant.
A process for the preparation of an aqueous aluminum silicate suspension comprising at least 30 wt. % aluminum silicate, 0.1 to 3.0 wt. % aluminum sulfate and 0.1 to 5.0 wt. % surfactant, said process comprising the following steps:
- (i) an aluminum silicate is precipitated by a synthetic route from aluminum sulfate and water-glass and filtered off;
- (ii) the aluminum silicate filter cake is liquefied by stirring and/or subjecting to shear with an aqueous aluminum sulfate solution and at least one surfactant is added;
- (iii)
- (iii) pulverulent aluminum silicate is added to the liquefied aluminum silicate filter cake, while stirring and/or subjecting to shear;
- and
- (iv) the mixture is optionally stirred and/or subjected to shear once more.
Dependencies are inferred from the claim text.