METHOD OF PRODUCING POROUS GLASS MATERIALS FROM OPEN-HEARTH FURNACE SLAGS Russian patent published in 1999 - IPC

FIELD: heat-insulating glass materials. SUBSTANCE: invention relates to a method of producing the porous glass materials (filled density is 45-100 kg/m³) from the open-hearth furnace slags that involves preparing the charge consisting of the following oxides: SiO₂, CaO, Al₂O₃, MgO, Fe₂O₃, Na₂O, K₂O, TiO₂, FeO, MnO, P₂O₅. Then the content of SiO₂ in the charge is brought about to the mass ratio SiO₂/CaO = 1-2 and melted in the reductive medium. Then silicate moiety of the melt is cooled in regime "thermoimpact". Obtained glass material has no hydrogen sulfide emission. EFFECT: broadened possibility of the open-hearth furnace slags as building and filtering materials.