FUSED MOULDED REFRACTORY MATERIAL WITH HIGH ZIRCONIUM DIOXIDE CONTENT Russian patent published in 2008 - IPC C04B35/484 C04B35/657 

FIELD: chemistry.

SUBSTANCE: scope of invention covers fused moulded refractory material intended for the purpose where the mentioned material contacts with melted glass, particularly, for use in edge zones of glass-melting furnace at temperatures below 1150°C. The refractory material contains, % w/w: more than 85% ZrO₂, 2-8 SiO₂, 0.12-1 Na₂O, 0.2-2 Al₂O₃, 0.5≤Y₂O₃+CaO≤2.6, provided Y₂O₃: 0.3-2% or CaO: 0.5-1.93%, where Na₂O may be substituted, at least partially, with K₂O, and Y₂O₃ and CaO may be present together or separately and where more than 85 % w/w of zirconium dioxide exists in monoclinic form. Production method of refractory material includes mixing of components, melting of the mixture obtained and casting in mold.

EFFECT: high anti-corrosive stability of refractory material without colouring the produced glass and reduction of bubbles formation in molten glass.

30 cl, 2 tbl