HEAT-INSULATING HEAT-RESISTANT MOLDED ARTICLE, IN PARTICULAR, A PLATE, METHOD OF ITS PRODUCTION AND ITS APPLICATION Russian patent published in 2020 - IPC C04B28/24 C04B38/00 C04B40/02 C04B111/20 B22D11/106 B22D11/11 

FIELD: moulding.

SUBSTANCE: group of inventions relates to a heat-insulating refractory molded article, to a method for its production and use of a molded article for heat insulation. Unfermented heat-resistant molded article for prolonged or continuous use at high temperatures, containing binding matrix of hardened binder and granular additive of filler from biogenic silicic acid, which is bound in binding matrix, where binding matrix consists of silica gel, additive in molded article by at least 50 wt % with respect to total dry weight of additives consists of rice hull ash, and additive contains from 0 to <10 wt % of total content (dry weight) of fillers of at least one additional filler from heat-resistant material, which consists not only of SiO₂, wherein the molded article has a softening point defined in the heating microscope according to DIN EN 51730 (09/2007), at temperature of 1500–1700 °C. Method of producing said molded article involves the following process steps: a) obtaining a mixture containing said additive and silicisole, b) placing the mixture into a mold, c) compacting the mixture, d) removing an undried molded article from the mold, e) curing the molded article at a temperature which is lower than the temperature of the ceramic firing so that the binder is cured or hardened. Use of said molded article for heat insulation of molten metal and/or metal ingot solidified from molten metal. Use of said molded article for heat insulation of refractory lining, or as anticorrosion barrier, or as fire-resistant lining, or as filtering material for hot gases. Group of inventions is developed in dependent claims.

EFFECT: technical result is obtaining a heat-resistant heat insulating molded article having low specific weight, high chemical purity and strength.

32 cl, 7 tbl, 1 ex, 6 dwg