On the basis of aluminosilicate bond made from heat-processed hydrated alumina and quartz sand in the molecular ratio of Al2O3: SiO2=3∩2, in conditions of autoclave processing at 800–1000 kg/cm2 in a period of 8–12 h, it is possible to obtain unfired aluminosilicate refractories with quite high physico-chemical factors. During the heating of the specimen after autoclave processing to the temperature of sintering, their strength diminishes to a small extent, which makes it possible to use these refractories directly in structures. The high strength of aluminosilicate refractories after autoclave processing is due to the formation of a gel-like hydrated aluminosilicate upon the interaction of Al(OH)3 with SiO2. The technology developed for the production of unfired autoclave firebrick and high-alumina refractories permits us to obtain large products which make it possible to industrialize their transportation and laying, and to reduce the number of joints in the lining.