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US 5,512,181 AGranted
Removing silica from cooling waters with colloidal alumina and dialysis
AssigneeNalco Chemical Company
InventorStephen A. Matchett
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Abstract
The-silica content of cooling water blow-down waters is reduced by contacting these waters with a colloidal alumina which adsorbs a portion of the silica. The blow-down is then dialyzed to produce a permeate having a reduced silica content. In a preferred embodiment of the invention the permeate is recycled.
Claims5
A method for reducing the silica content of cooling water blow-down which comprises the steps of:
- a) adding an effective silica absorbing amount of a colloidal alumina having an average surface area of at least 25m.sup.2 /g to a cooling water blow-down containing silica;
- b) mixing the cooling water blow-down with the colloidal alumina for a period of time sufficient for the colloidal alumina to adsorb at least a portion of the silica;.
- c) dialyzing the cooling water blow-down in a diafiltration cell containing a membrane whereby said cooling water blow-down permeates through the membrane;
- and then,
- d) recovering as the permeate a cooling water blow-down having a reduced silica content.
2 more elements
Dependencies are inferred from the claim text.