Dolomite brick is refractory products made from high-purity magnesite. It is characterized by environmental protection, high-temperature performance, and strong slag resistance. Ronghua 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.
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What are Dolomite Refractory Bricks?
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.
Parameters of Ronghua Dolomite Brick
| Item/Grade | MG-20 | MG-20A | MG-30 | MG-30A | MG-40 | MG-40A | MG-50 | |
|---|---|---|---|---|---|---|---|---|
| ω (CaO)/% | μ0 ≥ | 18 | 28 | 38 | 48 | |||
| ω (MgO+CaO)/% | μ0 ≥ | 92 | 94 | 92 | 94 | 92 | 94 | 94 |
| ω (SiO2+Al2O3+Fe2O3)/% | μ0 ≤ | 3.0 | 2.5 | 3.0 | 2.5 | 3.0 | 2.5 | 2.5 |
| Apparent Porosity/% | μ0 ≤ | 15.0 | ||||||
| Cold Crushing Strength/MPa | μ0 ≥ | 60 | ||||||
| 0.2MPa Refractoriness Under Load T0.6/℃ | μ0 ≥ | 1650 | 1700 | 1650 | 1700 | 1650 | 1700 | 1700 |
Advantages of Ronghua Dolomite Refractory Material Brick
- 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.
Applications of Ronghua Dolomite Brick
- 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.
