Dolomite Brick

Dolomite brick is refractory products made from high-purity magnesite. It is characterized by environmental protection, high-temperature performance, and strong slag resistance. Kerui Refractory provides off-the-shelf standard sizes and custom products of other specifications.

  • MgO+CaO: ≥92-94%;
  • CaO: ≥18-48%;
  • SiO2+Al2O3+Fe2O3: ≤2.5-3.0%;
  • Apparent Porosity: 15.0%;
  • Cold Crushing Strength: 60MPa;
  • 0.2MPa Refractoriness Under Load (T0.6): ≥1650-1700ºC.
Dolomite Brick - Kerui Refractory

Dolomite bricks are made from natural dolomitic limestone, a carbonate mineral. The main components of magnesite are magnesium carbonate and calcium carbonate. It has a Mohs hardness of 3.5 to 4. These two components have excellent refractoriness and volume stability. Due to their excellent properties, magnesia dolomite bricks are widely used in high-temperature industries.

ω (CaO)/%μ018283848
ω (MgO+CaO)/%μ092949294929494
ω (SiO2+Al2O3+Fe2O3)/%μ03.
Apparent Porosity/%μ015.0
Cold Crushing Strength/MPaμ060
0.2MPa Refractoriness Under Load T0.6/℃μ01650170016501700165017001700
  • Alkali Resistance:
    Magnesia calcium refractory bricks have good alkali resistance and are not eroded by alkaline slag and gas in alkaline chemical environments.
  • High Refractoriness:
    The combination of magnesium carbonate and calcium carbonate gives magnesia calcium bricks a high refractoriness. Their refractoriness is higher than that of fire clay bricks.
  • Thermal Shock Resistance:
    Dolomite bricks do not expand or contract significantly under rapid temperature changes.
  • High Strength:
    Dolomite bricks have high strength and can withstand high loads in high temperature environments.
  • Low Oxidation Potential:
    Dolomite bricks are suitable for use in desulfurization equipment. They are beneficial for purifying molten steel and have high compatibility with alkaline slags. They can improve the yield of ferroalloys.
  • Water Resistance:
    Dolomite brick products have poor water resistance. Compared to magnesia bricks, dolomite bricks have better water resistance.

Kerui Dolomite Bricks in Factory

  • Metallurgical industry: Ladle furnace, vacuum furnace, electric furnace, open hearth furnace, converter, refining ladle slag line, permanent lining of steelmaking converter, steel ladle, etc.
  • Building materials industry: Cement kiln, glass kiln, ceramic kiln, etc.
  • Chemical industry: Ammonia synthesis furnace, fertilizer furnace, synthetic rubber furnace, etc.
  • Power industry: Boiler, incinerator, etc.