Back to results
US 4,219,515 AGranted
Water alkalinity control in the manufacture of hydrous silicate products
AssigneeOwens-Corning Fiberglas Corporation
InventorsJerry L. Helser, William H. Rigby, Jr.
Life of this patent
Estimating the term…
Abstract
The water resulting from the filter press molding of slurries of hydrated lime and reactive silica in the manufacture of hydrous calcium silicate products is recycled to the process by treating it with carbon dioxide to precipitate dissolved calcium hydroxide, filtering, and returning the filtered water to the process step wherein the lime and silica are slurried in water.
Claims4
The process of manufacturing a hydrous calcium silicate insulating product comprising the steps of:
- (a) mixing a moldable slurry comprising calcareous and siliceous materials in water;
- (b) compressing and molding the resultant slurry under sufficient pressure to express water therefrom;
- (c) curing the molded slurry from the step (b) to form a hydrous calcium silicate bonded product.
- (d) collecting the expressed water accumulated in step (b) and contacting said water with carbon dioxide gas said carbon dioxide being introduced into said water in an amount sufficient to precipitate calcium carbonate;
- (e) filtering the resultant mixture of suspended calcium carbonate and water;
- and
- (f) returning the treated water obtained therefrom to the mixing step (a).
4 more elements
Dependencies are inferred from the claim text.