CRUDE MIXTURE FOR MAKING CERAMIC HEAT-INSULATING CONSTRUCTION MATERIALS Russian patent published in 2024 - IPC C04B38/02 C04B33/132 C04B35/63 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of crude mixtures for making ceramic heat-insulating materials and can be used to produce heat-insulating ceramics in the construction of residential, civil and industrial buildings. Argillite-based crude mixture for making ceramic heat-insulating building materials, as a correcting additive it additionally contains finely dispersed natural amorphous silica raw material of the following composition, wt.%: SiO₂ 87.00; Al₂O₃ 5.00; TiO₃ 0.3; Fe₂O₃ 2.25; P₂O₅ 0.07; FeO less than 0.25; CaO 0.72; MgO 0.50; MnO 0.02; K₂O 1.03; Na₂O 0.58; SO₃ less than 0.10; other secondary impurities 2.26, and the alkaline additive is a colloidal sodium polysilicate with a silicate modulus of 6.5, obtained by introducing 16% silicon dioxide hydrosol into 20% aqueous solution of sodium silicate in ratio of 1:1.6, stirring at 100 °C for 3 hours, followed by holding for 0.5 hours. Crude mixture contains components in the following ratio, wt.%: argillites 69.0–74.8; natural amorphous silica raw material 11.6–7.55; scrap glass 9.5–10.5; construction gypsum 4.92–5.1; aluminium powder 0.58–0.6; colloidal sodium polysilicates 3.4–2.5.

EFFECT: increasing strength of porous articles to 5.85–4.4 MPa while maintaining their density of 440–550 kg/m³ and reducing firing temperature.

1 cl, 2 tbl