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Magnesia Iron Spinel Brick

Magnesia iron spinel bricks are made of good synthetic spinel raw materials and special technology.

MgO: 85%

Fe2O3: 4-6%

Bulk Density: 2.90-2.95g/cm3

High thermal conductivity

Excellent structural flexibility

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Magnesia iron spinel brick is made of composite spinel and high-purity magnesia, adding specific mineralizer, high-pressure molding and high-temperature sintering.


  1. High compressive strength.
  2. Good thermal shock stability.
  3. Good thermal creep performance.
  4. High softening temperature under load.


TypeKR-MFe-85AKR -MFe-85BKR -MFe-85C
MgO (%)858585
Al2O3 (%)3~53~53~5
Fe2O3 (%)4~64~64~6
Bulk Density (g/cm3)2.952.932.90
Apparent Porosity (%)171717
Cold Crushing Strength (Mpa)555045
Refractoriness Under Load (T6.0,9)160015501500
Thermal Shock Resistance (950℃-Air Cooling) (times)1009090
Thermal Conductivity (W/m.K)
Thermal Expansion (1400℃) %


Magnesia iron spinel bricks are mainly used in the firing zone of cement kilns, and are also suitable for key parts of SP and NSP kilns with high kiln temperature, fast rotation speed, strong alkali erosion ability and large mechanical load.

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