METHOD OF PRODUCING CHARGE FOR FOAM GLASS CERAMICS Russian patent published in 2019 - IPC C03B1/00 C03C11/00 

FIELD: technological processes.

SUBSTANCE: invention relates to production of glass, foamed glass and foam glass ceramics, which are produced by annealing (single-step) technology for use as bulk heat insulation and aggregate of light concrete. Method of making granular charge for foam glass ceramics involves drying and grinding of silica-containing mineral component, preparation of binder solution, mixing of silica mineral component and binder solution, granulation and drying of charge, wherein binder solution is obtained by hydrothermal treatment of mixture of sodium carbonate solution and calcium oxide or hydroxide, taken in molar ratio of sodium carbonate to calcium oxide or hydroxide from 0.5 to 2, at temperature from 80 to 110 °C for 0.5–8 hours at a ratio of components which ensure presence of 5 to 15 wt % sodium oxide. Silica-containing mineral component can be represented by opal-cristobalite rocks (gaizes, tripoli, diatomites, zeolites) containing amorphous silica, acidic volcanic rocks containing silica in form of glass phase (perlites, obsidians, vitrophires, tuffs), as well as products of their metamorphism (zeolites), finely dispersed crystalline quartz (marshallites), technogenic raw materials, for example ash and metallurgical slag, wastes from hydrometallurgical processing of ores, low-melting clay and their transition varieties, as well as their mixtures.

EFFECT: technical result of the invention consists in cheapening the charge by using sodium carbonate as a more readily available sodium-containing material, high chemical resistance, low density and high heat-insulating properties of the end product – granular and block foam glass ceramics.

3 cl, 13 ex