Zhengzhou Zhongkeda Refractory Materials Co., Ltd
Magnesia Brick
Magnesia Refractory Bricks for High-Temperature Industrial Applications
High-Purity Magnesia Bricks | Direct-Bonded Magnesia Bricks | China Magnesia Brick Manufacturer
The main component of magnesia bricks is magnesium oxide (MgO), with a typical MgO content of over 90%. The primary crystalline phase is periclase. Magnesia bricks are generally classified into sintered magnesia bricks and fused magnesia bricks. In sintered magnesia bricks, those with direct bonding are called directly bonded magnesia bricks, while those produced through electrofusion are referred to as rebonded magnesia bricks.
Characters of Magnesia Refractory Brick:
•🔥High Refractoriness: Withstands temperatures above 2000℃, suitable for high-temperature environments.
•🛡️Alkali Slag Resistance: Excellent resistance to alkaline slag, making it ideal for alkaline environments.
•🔄Thermal Shock Resistance: Can endure rapid temperature fluctuations without cracking.
•💪High Mechanical Strength: Maintains strong mechanical properties even at high temperatures.
•🧪Corrosion Resistance: Strong resistance to alkaline substances and molten metal slag.
Typical Applications of Magnesia Refractory Bricks:
•🏭Steel Industry: Converter linings, electric arc furnace (EAF) linings, ladle slag zones
•🏗️Cement Industry: Transition zone and burning zone of rotary kilns
•🔶Non-Ferrous Metallurgy: Smelting furnaces for copper, nickel, and lead
•🥃Glass Industry: Regenerative chambers and checker bricks
Paramaters of Magnesia Refractory Brick:
Item
M-98
M-97A
M-97B
M-95A
M-95B
M-91
M-89
MgO(%)≥
97.5
97
96.5
95
94.5
91
89
SiO₂（%）≤
1.0
1.2
1.5
2.0
2.0
3.0
3.0
CaO（%）≤
/
/
/
2.0
2.0
3.0
3.0
Apparent Porosity（%）≤
16
16
18
16
18
18
20
Bulk Density（g/cm³）≥
3
3
3
2.95
2.95
2.90
2.85
Cold Crushing Strength（MPa)≥
60
60
60
60
60
60
50
0.2MPa Refractoriness Under Load(℃）≥
1700
1700
1700
1650
1650
1560
1500
Permanent Linear Change After Heating（%）
Shape & Size of Magnesia Refractory Brick:
FAQ:
Straight
Split
Arch
Wedge
Tile
Other Shape
L×W×H(mm)
L×W×H (mm)
L×W×H/h(mm)
L×W×H/h (mm)
L×W×H (mm)
Key brick
230×114×65
230×114×25
230×114×65/45
230×114×65/45
230×230×38
Skew brick
230×114×75
230×114×32
230×114×65/55
230×114×65/55
230×230×50
Soap
230×114×37
230×114×75/45
220×114×75/45
230×230×65
Checker
230×114×50
230×114×75/55
220×114×75/55
230×230×75
Neck
230×114×75/65
220×114×75/65
Taper
Q:What is the maximum service temperature of magnesia refractory bricks?
A:Magnesia bricks can withstand temperatures up to 1900°C, depending on the grade and application. Fused magnesia and direct-bonded magnesia bricks offer even better performance in extreme environments.
Q: Are magnesia bricks resistant to slag and corrosion?
A:Yes. Due to their alkaline nature, magnesia bricks offer excellent resistance to basic slags, particularly in steelmaking furnaces and ladle linings.
Q:What are the differences between sintered and fused magnesia bricks?
A:•Sintered magnesia bricks are made from calcined magnesite and offer good refractoriness.
•Fused magnesia bricks are made using electrofused magnesia, providing higher density, slag resistance, and thermal shock stability.
Q:Do you offer custom sizes or shapes for magnesia bricks?
A:Yes. We support customization of sizes and shapes based on customer furnace design and specifications. Drawings or samples are welcome for OEM production.
Q:Do magnesia bricks have good thermal shock resistance?
A:Yes, especially fused magnesia bricks and magnesia-chrome bricks. Thermal shock resistance is critical in frequent cycling environments, such as EAF and ladle operations.
Q:What is the packaging method for export?
A:Bricks are packed on fumigated wooden pallets, wrapped with waterproof plastic film, and secured with steel bands to prevent damage during sea transport.
Q: What grades of magnesia bricks do you supply?
A:We offer:
•Ordinary sintered magnesia bricks (90–92% MgO)
•High-purity magnesia bricks (≥95% MgO)
•Fused magnesia bricks
•Magnesia-carbon bricks
•Magnesia-chrome bricks
Each grade targets different industrial needs and budgets.
Q: Which countries do you export magnesia bricks to?
A:We’ve exported to over 30 countries, including the USA, Germany, India, Turkey, Brazil, South Africa, Vietnam, and Indonesia, serving global steel plants, cement kilns, and glass factories.]
