Magnesia refractory brick is an alkaline refractory material mainly composed of magnesite as the main crystal. Magnesium oxide content is as high as 97.5%. This type of brick can be used at 1750℃. It is widely used in various high-temperature industrial fields. Kerui Refractory offers different kinds of magnesia bricks for more than 1000+ partners from worldwide.
- MgO: ≥91.0-97.0%;
- Apparent Porosity: 16-18%;
- Bulk Density: 2.90-3.00g/cm³;
- Cold Crushing Strength: 60MPa;
- Size: 230*114*65mm (standard) and other sizes;
- Delivery: 15-30 working days;
6 Main Types of Composite Magnesia Refractory Bricks
In addition to high-purity magnesia bricks, we also provide other composite types of magnesia bricks, including the following types. These bricks contain varying amounts of magnesium oxide.
Specification Data of Magnesia Refractory Bricks
Kerui Refractory offers high-purity magnesia bricks and other composite magnesia bricks. Shown here are the parameters of high-purity magnesia bricks.
| Item | M-98 | M-97A | M-97B | M-95 | M-91 | |
|---|---|---|---|---|---|---|
| MgO, % | ≥ | 97.5 | 97.0 | 96.5 | 95.0 | 91.0 |
| SiO2, % | ≤ | 1.00 | 1.20 | 1.50 | 2.00 | / |
| CaO, % | ≤ | / | / | / | 2.00 | 3.00 |
| Apparent Porosity, % | ≤ | 16 | 16 | 18 | 16 | 18 |
| Bulk Density, g/cm³ | ≥ | 3.00 | 3.00 | 2.95 | 2.90 | |
| Cold Crushing Strength, MPa | ≥ | 60 | 60 | 60 | 60 | |
| 0.2MPa Refractoriness Under Load, ℃ | ≥ | 1700 | 1700 | 1650 | 1560 | |
| Permanent Linear Change, % | 1650℃*2h -0.2~0 | 1650℃*2h -0.3~0 | 1600℃*2h -0.5~0 |
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Different Production Processes of High-quality Magnesia Bricks
Magnesite bricks are mainly made from natural magnesite materials, with a magnesium oxide content of over 89%. The melting point of magnesite is as high as 2800ºC, making bricks highly refractory. Depending on the production process and properties, magnesia bricks are divided into burned magnesia bricks and chemically bonded magnesia bricks.
Burned Magnesite Refractory Bricks
Burned magnesia bricks are produced by high-temperature firing of raw materials. These high temperature refractory bricks have high refractoriness, strong resistance to high temperatures, and good alkali resistance, making them suitable for high-temperature alkaline working environments. Common types of burned magnesia bricks include magnesia refractory bricks, magnesia-alumina bricks, magnesia-chrome bricks, magnesia-iron spinel bricks, magnesia-calcium bricks, and others.
Chemically Bonded Magnesium Bricks
Chemically bonded magnesia bricks, also known as unburned magnesia bricks, are formed by mixing raw materials at room temperature. They exhibit good alkali resistance, seismic resistance, and abrasion resistance, making them more suitable for applications with high mechanical performance requirements. Common types of chemically bonded magnesia bricks include alumina magnesia carbon bricks, magnesia carbon bricks, magnesia calcium carbon bricks, and others.
Magnesia Bricks Properties
High Density
magnesia bricks have a high mineral content. They are dense and exhibit good resistance to penetration and leakage. They effectively prolong the lifespan of materials.
Strong Resistance to Spalling
Magnesia bricks have a strong resistance to alkaline slag erosion, such as iron oxide and calcium. They contain a high proportion of magnesium oxide, which helps maintain stability in alkaline environments.
High Heat Resistance
They have a high load softening temperature, with high-purity magnesia bricks reaching temperatures of up to 1800 degrees Celsius. Magnesia bricks maintain structural stability in high-temperature environments, resisting deformation or cracking.
High Thermal Conductivity
Magnesium oxide bricks efficiently transfer heat, improving temperature uniformity in furnaces. This accelerates heat treatment processes and reduces energy consumption.
Moderate Expansion
Magnesia bricks typically exhibit a linear expansion rate of 1.0-2.0% between 1000-1600 degrees Celsius. Moderate expansion at high temperatures helps maintain structural stability.
Strong Abrasion Resistance
Magnesium oxide has high hardness, making magnesia bricks resistant to wear in high-temperature environments. They are suitable for use in high-temperature environments requiring strong abrasion resistance.
What are Magnesite Bricks Used For?
Due to its superior performance, magnesia bricks are widely used in various industries, including the steel industry, construction materials industry, glass industry, and non-ferrous metal industry.
Steel Industry
- Basic oxygen furnace, furnace lining, hearth, and walls;
- Ironmaking furnace;
- Mixer furnace;
- Converter;
- Ladle;
- Electric arc furnace.
Construction Materials Industry
- High-temperature tunnel kiln;
- Lime kiln;
- Calcination kiln;
- Rotary kiln for mud recycling;
- Heating furnace.
Non-Ferrous Metal Industry
- Industrial furnaces;
- Copper, lead, nickel, zinc, tin smelting furnaces;
- Non-ferrous metal kilns.
Glass Industry
- Glass regenerative furnace;
- Heat exchanger;
- Glass kiln;
- Glass tank grid.
Competitive Factory Magnesite Bricks Price
If you would like to know the detailed price of magnesia bricks, please send us your requirements. The price of magnesia bricks varies depending on the quantity, size, and composition. Kerui Refractory, as a manufacturer of magnesia bricks, provides competitive prices and services. To determine the detailed requirements of customers, please send us the following information:
- Application scenario
- Kiln size and operating temperature
- Type and requirements of magnesia bricks
- Project timeline
- Construction requirements
Choose Kerui Refractory as Magnesia Brick Manufacturer
Kerui Refractory has over 20 years of experience in the magnesia brick industry. Many customers choose us not only for our strong company capabilities but also for our comprehensive services.
Company Strength
- With over 30 patented technologies, certificates, and company honors, we ensure the quality and quantity of magnesia brick production while continuously upgrading our processes.
- We have 20 pressure equipment units and 2 sets of 168-meter tunnel kilns to guarantee the production volume and quality of magnesia bricks.
- Our team of over 100 factory professionals conducts rigorous inspections, packaging, and shipping of magnesia bricks.
Comprehensive Services
- We offer customized magnesia brick services.
- Based on the requirements of the kiln, we can provide customers with design drawings and recommendations for refractory materials.
- Our professional construction team is available on-site to assist customers with the construction and trial operation of magnesia bricks.
Contact Kerui Refractory to Get Your Magnesia Bricks Now!
Kerui magnesia refractory bricks boast high quality and large output because of our automated and precise production line. We also provide detailed solutions tailored to meet customer requirements. Join us to experience the quality and reliability of Kerui magnesia bricks and services, and witness the difference in performance and durability.