METHOD OF OBTAINING GRANULAR HEAT INSULATING MATERIAL Russian patent published in 2010 - IPC C04B38/00 C04B20/00 C04B14/24 

FIELD: chemistry.

SUBSTANCE: invention relates to production of building materials, specifically to production of heat insulating aggregates used as thermal insulation in various structures and components of buildings. The method of obtaining granular heat insulating material for buildings involves mixing amorphous silica with particle size of 1-100 mcm with silica-containing granular filler such as sand with particle size of 5-70 mcm for 3-10 minutes until a homogeneous granular mass is obtained, adding into the dry granular mass an alkali-containing component which is pre-diluted with water either in form silica-containing binder with density of 1.5-1.7 g/cm³ in ratio of 1:1-4:1, or in form of an aqueous solution of sodium hydroxide or caustic soda in ratio of 1:0.2-1:0.5, mixing the dry granular mass with this alkali-containing component for 3-5 minutes until obtaining a homogeneous paste-like mass, pushing this mass through a draw plate with diametre of 3-8 mm, cutting the filaments coming out of the draw plate into pieces which are at least 5-6 mm long, granulation of with simultaneous expansion of the granules while drying them in a rotating drying chamber at temperature of up to 250°C and with the following ratio of components in wt %: amorphous silica 23.0-34.0, said granular filler 49.0-58.0, said alkali-containing component 4.0-13.0, water - the rest.

EFFECT: simple process, obtaining granules with low thermal conductivity, high strength, water resistance and frost resistance.

1 cl, 2 ex