METHOD OF MAKING HEAT-INSULATION BLOCKS Russian patent published in 2014 - IPC C03B19/08 

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat-insulation building materials with closed porosity. Binder solution is prepared first via combined wet grinding of silicate lumps with silica modulus of 1-3 and a silica-containing component with ratio of dry components of 1:1-1:5 and water to solids ratio of 1:1.2-1:4 at temperature of 70-110°C until complete dissolution of the silicate lumps. The silica-containing component is then added to the binder solution until a moulding compound with moisture content of 5-35% is obtained. The moulding compound is granulated and dried. The raw granules are placed in a mould and heated to foaming temperature, followed by annealing. Cooling is carried out at a rate of not more than 4°C per minute.

EFFECT: simple technique of producing heat-insulation materials and low cost of the product.