Process of preparing sodium-aluminum silicate dispersion complex and composition
AssigneeAnglian Water Authority
InventorFred Smith
Life of this patent
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Abstract
A new complex alkali metal-aluminium-silicate material is made that is of particular value as a coagulant or coagulant aid in the removal of solids from aqueous suspensions. The complex material is completely soluble in hydrochloric acid. It is made by mixing with high shear an aqueous solution of alkali metal silicate and an aqueous solution of an aluminium salt in such proportions and under such conditions that a complex alkali metal-aluminium-silicate polymeric material is formed substantially immediately upon contact of the solutions and is rendered into a stable dispersion in water.
Claims9
A process in which a complex sodium aluminium silicate polymeric material that is completely soluble in hydrochloric acid and that is a stable dispersion in water is made by feeding an aqueous solution of sodium silicate and an aqueous solution of aluminium sulphate separately through separate inlets arranged around the base of a cylindrical chamber into the chamber, and rotating at a speed of about 1,000 to 5,000 r.p.m. rotor blades that are at least two-thirds the diameter of the chamber and that are mounted close to the base of the chamber not more than about 6 mm above the inlets, the proportions of sodium silicate and alumium sulphate and the total amount of water introduced into the chamber being such that in the product of the process the amount of silicate, measure as SiO.sub.2, is 0.5 to 5% and the pH is from 3 to 7.5.
Dependencies are inferred from the claim text.