Magnesia Bricks, also known as Magnesia Refractory Bricks, are a type of basic refractory material with exceptional resistance to alkaline slag and high temperatures. With a magnesia content ranging from 92% to 97.7%, and Cristobalite as the main crystal phase, these bricks are widely used in demanding industrial applications. They serve as linings in glass furnaces, steelmaking furnaces, cement kilns, non-ferrous metal furnaces, and other high-temperature equipment.
At Highland Refractory, we specialize in producing various magnesia bricks, including sintered magnesia bricks, fused magnesia bricks, magnesia carbon bricks, and chemical bonded magnesia bricks, providing scenario-based solutions for industrial requirements.
Sintered magnesia bricks include directly bonded, recombined, and fused magnesia bricks. These bricks are manufactured from high-purity magnesia sand and magnesia clinker, fired at 1650–1750℃, making them ideal for high-temperature environments such as glass furnace regenerators and steel furnace linings.
Key Features:
High refractoriness and chemical stability
Excellent resistance to alkaline slag
Strong thermal shock performance
Suitable for long-term use in heavy-duty furnaces
Unburned magnesia bricks, also called chemical bonded magnesia bricks, use chemical binders or asphalt bonding agents for shaping and drying. They are suitable for low-to-medium temperature applications, providing cost-effective performance while maintaining good resistance to alkaline slag.
Key Features:
Lower firing temperatures compared to sintered bricks
Good load-bearing capacity at moderate temperatures
Reliable thermal stability in secondary furnace areas
Magnesia bricks have versatile applications across multiple industries:
Glass Industry: Used in grids, regenerators, and heat exchangers of glass furnaces, such as magnesia checker bricks, to resist corrosion from molten glass and alkaline slag.
Steel Industry: Serve as lining bricks for steelmaking furnaces, converters, ladles, and ferroalloy kilns.
Non-Ferrous Metals: Applied in copper, lead, and zinc furnaces, providing chemical resistance and high-temperature durability.
Cement and Building Materials: Magnesia bricks are essential in lime kilns, while magnesia spinel bricks are used in cement rotary kilns for heat-resistant lining.
Refractory Manufacturing Industry: Used in high-temperature calcining kilns, shaft kilns, and tunnel kilns to produce high-quality refractory materials.
Why choose magnesia bricks from Highland Refractory?
High Refractoriness: Magnesia bricks withstand temperatures above 1700℃, providing reliable protection in extreme environments.
Alkali and Slag Resistance: Excellent resistance to alkaline slag erosion, making them ideal for glass and steel applications.
High Softening Point: Softening under load occurs only at very high temperatures, ensuring structural integrity.
Purity & Environmental Benefits: High-purity magnesia reduces contamination and minimizes pollution in glass or steel production.
Long Service Life: With strong thermal stability and low creep under load, these bricks ensure extended operational lifespan.
| Item | DMZ-95 | DMZ-96 | DMZ-97 | DMZ-98 |
|---|---|---|---|---|
| MgO % | ≥95 | ≥96 | ≥97 | ≥97.5 |
| SiO2 % | ≤1.5 | ≤1.2 | ≤1.0 | ≤0.5 |
| CaO % | ≤1.5 | ≤1.2 | ≤1.2 | ≤0.6 |
| Apparent Porosity % | ≤18 | ≤18 | ≤17 | ≤15 |
| Bulk Density g/cm³ | ≥2.95 | ≥3.0 | ≥3.05 | ≥3.05 |
| Cold Crushing Strength Mpa | ≥55 | ≥60 | ≥60 | ≥60 |
| Refractoriness Under Load ℃ | ≥1650 | ≥1680 | ≥1700 | ≥1700 |
| Thermal Stability 950℃ Wind Cycles | ≥15 | ≥20 | ≥20 | ≥20 |
Note: Additional specifications for Magnesia Carbon Bricks, Magnesia Spinel Bricks, Magnesia Alumina Bricks, and Magnesia Chrome Bricks are available upon request.
The production of magnesia bricks follows strict industrial standards:
Raw Material: High-purity magnesia sand or clinker
Sintered Bricks: Crushed, batched, kneaded, shaped, and fired at 1550–1650℃, with high-purity products reaching above 1750℃
Fused Bricks: Made from fused magnesia sand, fired in high-temperature tunnel kilns
Unburned Bricks: Mixed with chemical binders, molded, and dried at controlled temperatures
Alkaline Resistance: Magnesia bricks are resistant to alkaline slag but cannot withstand acid slag erosion.
High-Temperature Caution: At temperatures above 1600℃, magnesia bricks can react with silica, clay, or high alumina bricks. Use neutral separation bricks where necessary.
Thermal Conductivity: Low at room temperature but increases at high temperatures; careful attention is needed for electric furnace bottoms.
Highland Refractory has over 35 years of experience producing high-quality magnesia bricks. We export to over 30 countries, offering:
Custom solutions based on industry applications
Scenario-specific recommendations for glass, steel, cement, and non-ferrous furnaces
Transparent technical data and certification
Competitive pricing without compromising quality
To ensure optimal performance and durability in your high-temperature equipment, select the right magnesia brick. Contact Highland Refractory Specialists today for:
Free consultation on brick selection
Custom technical support for furnace linings
Detailed product datasheets for all magnesia brick types
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