METHOD FOR PRODUCING FOAM GLASS-CERAMIC GRANULAR BUILDING MATERIAL FROM NATURAL QUARTZ SAND Russian patent published in 2022 - IPC C04B20/04 C04B20/06 C04B28/26 C04B38/00 

FIELD: building materials.

SUBSTANCE: invention relates to the field of production of building materials, in particular, to production of artificial porous aggregates for concretes and granular heat insulation materials for loose-fill insulation, and to production of semi-finished products for producing a granular building material. Method for producing a granular building material from a raw material mixture consisting of a silica component and an alkaline binder solution includes the stages of drying the silica component; creating an alkaline binder solution by joint wet milling of the glass-like sodium silicate, sodium carbonate, and water at 80 to 110 °C for 10 to 180 minutes; mixing the resulting binder and silica component and granulating the mixture in a granulator mixer; after granulation, subjecting the raw granules to heat treatment: drying to a moisture content of 1 to 15% at temperature 200 °C and firing; herewith, dried crushed natural quartz sand is used as a silica component; the joint wet milling is performed at the following ratio of components of the binder solution, wt.%: glass-like sodium silicate 5 to 20, sodium carbonate 5 to 20, water 60 to 90; the resulting binder and the silica component are mixed and granulated out at a 1:15 to 1:5 ratio of the binder solution and the silica component; firing is performed at 850 to 930 °C for 5 to 30 minutes, wherein the total content of alkaline oxides in the resulting material is 15 to 25 wt.%. The invention is developed in the dependent claim.

EFFECT: reduced bulk density and water absorption, increase in the compressive strength of the granular building material, and lower firing temperature.

2 cl, 10 tbl, 5 ex