METHOD OF PRODUCING GRANULAR CONSTRUCTION MATERIAL Russian patent published in 2017 - IPC C04B20/04 C04B20/06 C04B28/26 

FIELD: construction.

SUBSTANCE: invention relates to production of construction materials, in particular, to production of artificial porous aggregates for concrete and granular heat-insulating materials for charging of heat insulation, as well as to production of semi-finished product for production of granulated construction material. Method of producing granular construction material, which involves preparation of a silica component, preparation of a binding solution, mixing of components, granulating mixture and heat treatment, binder solution is prepared based on colloidal silica and soluble salts of alkali metals by combined wet grinding with simultaneous dissolution of sodium silicate with silica modulus of 1.0 to 4.0, sodium carbonate and/or other water-soluble compounds of alkali metals at temperature 80–110 °C, at following ratio of basic components: vitreous sodium silicate – 10–50 %, sodium carbonate – 5–40 %, water – 40–80 %, wherein mixing silica component with a binding solution is combined with addition of gas-forming agent and granulation of mixture, wherein mixing and granulation are carried out in one device – granulator with ratio of binding solution and silica component from 1:5 to 1:1.2, then raw granules are subjected to thermal treatment: drying to moisture content 1–15 % and annealing at 750–1,100 °C, wherein total content of alkaline oxides in finished material ranges from 5 to 20 wt%. Invention is developed in subclaims.

EFFECT: improved operational characteristics of material, particularly low packed density and volumetric water absorption.

6 cl, 10 ex