COMPOSITION AND METHOD OF MANUFACTURE OF FIRE CLAY REFRACTORY CONCRETE Russian patent published in 2018 - IPC C04B28/26 C04B35/18 C04B40/00 B82B3/00 C04B111/20 C04B111/27 

FIELD: construction.

SUBSTANCE: invention relates to the refractory materials industry, namely to refractory concrete, and can be used in the manufacture of fire clay refractory concrete products. Composition for the production of fire clay refractory concrete, including: binder, fireclay aggregate, fine-grained fillers with a specific surface of 2500-3000 cm²/g and water, contains, as a binder, a colloidal sodium polysilicate with a silicate module of 6.5, obtained by introducing a 16% hydrosol of silica in a 20% aqueous solution of sodium silicate at a ratio of 1:1.6, stirring at 100°C for 3.0 h with an exposure of not more than 0.5 h, and as a filler - natural amorphous finely divided silica of the following chemical composition, mass%: SiO₂ - 87.00; Al₂O₃ - 5.00; TiO₃ - 0.3; Fe₂O₃ - 2.25; P₂O₅ - 0.07; FeO less 0.25; CaO - 0.72; MgO - 0.50; MnO - 0.02; K₂O - 1.03; Na₂O - 0.58; SO₃ less 0.10; LOI - 2.26, with the following ratio of components, mass%: fire clay filler of fraction 0.15-7 mm 60-90, finely ground fire clay S_sp= 2500-3000 cm²/g 5-16, natural amorphous finely dispersed silica 2-16, colloidal nanodispersed sodium polysilicate 3-8, water from the calculation of the V/T 0.12-0.14. Method for manufacturing fireclay refractory concrete from the above composition comprises the introducing amorphous silica and finely ground chamotte into a colloidal polysilicate of sodium and addition of water, mixing in a high-speed mixer to obtain a uniform suspension, followed by mixing it with a fireclay filler in a paddle mixer of forced action until a homogeneous mass is obtained, molding it by pressing at a specific pressure of 40 MPa, curing by mode: rise in temperature from 20 to 90°C=1.5 hours, exposure at 85-95°C is 0.5 hours, then 1 hour raising the temperature to 200°C, 2 hours exposure.

EFFECT: technical result is increased temperature of the beginning of deformation under a load of 0,2 MPa, the thermal resistance and water resistance of articles made of fireclay refractory concrete.

2 cl, 2 tbl