METHOD OF PRODUCING POROUS GRANULAR CONSTRUCTION MATERIAL Russian patent published in 2025 - IPC C04B38/02 C04B28/26 C04B40/00 C04B24/00 

FIELD: construction materials.

SUBSTANCE: invention relates to production of construction materials which can be used as light aggregate in production of dry construction mixtures, mortars and concrete. Disclosed method involves crushing silica raw material, mainly tripoli, to fraction of 0.5-10 mm; grinding this fraction to achieve a powdery state; preparation of a mixture by loading a powdered fraction into a mixer, moistening it with hot water, introducing an alkali into the mixer together with a pore-forming, reinforcing and water-retaining additive; mixing the obtained mixture, accompanied by self-heating, until a hot viscous mixture is obtained; step-by-step processing of the ready mixture with the possibility of obtaining a milled semi-finished product as a result; drying the semi-finished product and its further grinding to obtain a granulated fraction; loading the granulated fraction into a porous-forming furnace to obtain porous granules of the finished product; the latter are cooled in a cooler-classifier and distributed in a hopper-accumulator by fractions of granules of various sizes. Prior to grinding, crushed fraction of tripoli 5-10 mm is pre-dried to residual moisture content within 3-5%. Step-by-step processing of the ready viscous mixture is carried out by unloading the mixture into a proportioner-extruder with subsequent moulding of briquettes with size of 150×150 mm, rolling of briquettes on rolls on "pancakes" with thickness of 10-15 mm, followed by cooling on conveyor, grinding "pancakes" on belt-shredder to pellets with size of 10×10 mm. Pellets are dried to residual moisture content of 15-20% with subsequent crushing to granulated fraction of 0.25-1.5 mm. Powder fraction is milled within 80-100 mcm, finished product granules are fired and expanded in porous-forming furnace within 550-650 °C.

EFFECT: obtaining ceramic foam granules of a construction material with a closed cellular structure, having superior physical and mechanical characteristics to the prototype.

1 cl, 1 dwg, 1 tbl, 2 ex