METHOD TO PRODUCE CONSTRUCTION ITEMS BASED ON SILICA-CONTAINING BINDER Russian patent published in 2012 - IPC C04B40/00 C04B28/26 C04B111/20 

FIELD: construction.

SUBSTANCE: method includes preparation of silica-containing binder with density of 1.3-2.4 g/cm³, module 15-30, from the mixture containing inorganic bond, a silica-containing component, a hydrofluoric acid salt in amount of 0.5-10.0 wt % of the mixture, and water, during their intensive mixing in a high-speed mixer at their mixing speed of 2600-6000 rpm, frequency of particle oscillations 3600-45000 rpm, heating at 80-90°C or under effect of electric current with intensity of 15-40 W and current force of up to 60 A, with subsequent cooling during mixing with speed from 40 to 100 rpm at 15-25°C within 10-12 hours or air aeration at 10-20°C within 6-11 hours, preparation of moulding material is carried out by mixing 9.0-13.5 wt % of this produced binder and 86.5-91.0 wt % of the silica-containing filler with moisture of not more than 6% and dispersion of 4-50 mcm or 60-150 mcm, or 0.2-25 mm, homogenisation of masses, formation by means of vibration casting or surface vibration compaction, or by means of vibration pressing, or semidry pressing with force from 1.0 to 400 kg/cm² on a press or on a conveyor with pressing force from 150 to 600 kg/cm², thermal treatment is carried out at the temperature of 400-950°C, and when hot fillers are used from the ones listed above, thermal treatment is carried out at 85-95°C. The invention is developed in dependent claims.

EFFECT: simplified method, expansion of produced articles assortment, higher strength and other operational properties, cheapening of produced articles.

3 cl, 6 tbl, 3 ex, 1 dwg