Owens-corning Fiberglas Corporation

Jerry L Helser

Richard F Shannon

William H Rigby, Jr

Off-size greenware (the product resulting from the initial gelation and filter pressing of calcareous and siliceous materials in an aqueous slurry) is recycled. The greenware is pulverized into a desirable size and combined with new calcareous and siliceous materials in the initial slurrying step. The slurry containing recycled greenware gels at an improved rate.

Hydrous calcium silicate insulation products manufactured by recycling

Method for recycling greenware in the manufacture of hydrous calcium

Rigid shaped articles of expanded inorganic aggregate, such as expanded perlite, bonded with calcium silicate hydrate and preferably reinforced with fibers, are made by mixing a hydrothermally reacted gel of calcium silicate hydrate crystals with the expanded aggregate, shaping and drying, without treatment with saturated steam after the gel and aggregate have been mixed.

Expanded inorganic aggregate bonded with calcium silicate hydrate as

Rigid cellular hydrous calcium silicate thermal insulating product of low density can be made by aerating an aqueous slurry containing reactive calcareous and siliceous materials, preferably in conjunction with the incorporation of a foaming agent in the slurry, and then indurating the aerated slurry by the application of heat and pressure.

Method for making xonotlite insulation by foaming an aqueous slurry of

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.

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Hebron, OH, United States of America

Jerry L Helser