Magnesium zirconium brick is a kind of magnesia composite refractory made of magnesia and zirconium as the main raw materials. The main chemical components are MgO, ZrO2 and SiO2.The main mineral composition is calcite, magnesium olivine and plagic zircon
During sintering, zirconite in the matrix reacts with coarse magnesium oxide particles to form magnesium olivine and plagioclase zircon (ZrO2) surrounding the magnesium oxide particles, protecting the magnesium oxide particles from erosion.Due to the difference of thermal expansion between zrO2 and zrO2, fine cracks are formed inside the brick, which can disperse the stress.Therefore, magnesia-zirconium brick has good thermal shock stability and good corrosion resistance to metal oxides and sulfides.
Magnesium zirconium brick is mainly used in the upper and middle part of the regenerative chamber of glass kiln, and its service life is much higher than that of burnt magnesia brick, and its service life can reach more than 6 years in the kiln producing sodium-calcium glass.
Physical properties and chemical compositions
Item | Magnesia-Zircon Brick | ||
TY-MZ8 | TY-MZ10 | TY-MZ13 | |
MgO% ≥ | 80 | 75 | 70 |
ZrO2 %≥ | 8 | 10 | 13 |
Apparent Porosity%≤ | 19 | 18 | 18 |
Bulk Density (g/cm3)≥ | 3.95 | 3.00 | 3.05 |
Cold Crushing Strength (MPa)≥ | 50 | 45 | 40 |
Refractoriness Under Load°C≥ | 1600 | 1550 | 1600 |
Thermal Shock Resistance(950-wind cold)≥ | 10 | 10 | 10 |
