Handy Chemicals Ltd.

Dieter Haase

Carmel R Jolicoeur

Nelu Spiratos

Robert M Christie

Denis Pothier

The invention relates to basic polynucleate aluminum hydroxy silicate sulfate compounds and to a process for their preparation. The process involves first mixing an alkali metal silicate and an alkali metal aluminate solution and optionally a third component under continuous stirring to form an alkaline intermediate mixture and slowly adding the resulting alkaline intermediate mixture to an acidic aluminum sulfate solution under high shear mixing conditions. Compared to processes of the prior art, the present invention leads directly to solution products having higher Al.sub.2 O.sub.3 concentrations. Moreover, the products prepared through this invention exhibit enhanced stability over time, and improved performance in flocculation-coagulation application.

Polymeric aluminum silicate-sulphate and process for producing same

A polynucleate aluminum hydroxy silicate-sulphate compound (PASS) having the following average composition:

Polymeric basic aluminum silicate-sulphate

A polynucleate hydroxy silicate-sulphate compound having the following average composition of the general formula:

The present invention relates to a process for the preparation of a poly aluminum sulphate product having the following formula:

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Ste-Catherine, Canada

Dieter Haase