METHOD OF MANUFACTURING DECORATIVE AND FACING PRODUCTS Russian patent published in 2000 - IPC

FIELD: manufacture of building materials, structural components, sidewalk plates and stones; internal finishing of interiors to replace products from natural decorative and facing stone materials. SUBSTANCE: method comprises preparing alkaline silica binder containing 0.1-2.0 wt.% of alkali metal oxides by firing quartz sand wetted with aqueous solutions of alkali metal compounds selected from group of sodium and/or potassium carbonates and hydrates at 1000-1550 C, mixing alkali silica binder with finely divided quarts sand, filler and mixing liquid in the form of aqueous solution of alkali metal compound, e. g. sodium hydroxide, molding the products from freshly prepared raw mix and heat treating said products in autoclave. Quartz sand wetted with aqueous alkali solution is fired till quartz is completely converted to roentgenoamorphous phase and metastable cristobalite with tridimite admixture of not higher than 20 wt.%, and products are molded in two layers having thickness of at least 5-10 mm. EFFECT: lower energy consumption with physical and chemical properties remaining undeterioraled. 12 cl, 2 ex, 2 tbl