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Magnesia Zirconium Brick

There are 3 methods to add ZrO2 into magnesia batch material: direct adding method, pre-synthesis method and surface coating method.

Direct adding method is adding ZrO2 containing material into magnesia according to required MgO/ZrO2 ratio and purity. Pre-synthesis method is the one through which MgO-ZrO2 clinker is produced and added into magnesia batch material. Surface coating method is used to coat ZrO2 based refractory to magnesia grains, so the surface of every grain forms homogeneous ZrO2 thin layer.
Compared with pure MgO material, the addition of ZrO2 can contribute to sintering, so magnesia zirconia bricks can be sintered at relatively lower temperature. With the increase of ZrO2 content, MgO-ZrO2 bricks have higher bulk density, lower porosity, higher cold and high temperature strength. The addition of ZrO2 can improve thermal shock resistance, and the higher ZrO2 content, the stronger thermal shock resistance.

Magnesia Zirconia Bricks Physiochemical Indexes

Item MGZ-a MGZ-b MGZ-c
MgO % 95 93 96.2
CaO % 1.4 1.2 0.9
ZrO2 % 1.8 3.0 1.4
SiO2 % / 0.9 0.8
Al2O3 % / 0.4 0.3
Fe2O3 % / 0.7 0.6
Apparent porosity % 15.0 15 13
Bulk density g/cm3 2.96 2.98 3.11
Crushing strength Mpa 80 70 80
Refractoriness under load ℃ 1700 1680 1700

Magnesia zirconia bricks are used in glass kiln regenerator checkerwork upper part and middle part and glass kiln combustion chamber upper structure. Magnesia zirconia bricks contains large amount of forsterite and zirconia, since they have strong corrosion resistance, the corrosion resistance of magnesia zirconia bricks is improved. Regenerator upper part temperature is about 1300℃, magnesia zirconia bricks can totally meet working environment. Besides, magnesia zirconia bricks also suffers SiO2 corrosion, alkaline vapor corrosion and sulfur corrosion.


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