Magnesia Spinel Brick
LAR’s magnesia spinel refractory brick is a high-performance material widely used in steelmaking and metallurgical furnaces. The brick combines high-purity magnesia (MgO) with spinel (MgAl₂O₄), forming a dense and stable structure. This combination provides excellent resistance to basic slag corrosion and thermal stress.
LAR’s magnesia Spinel Brick provides excellent resistance to high temperature and thermal shock. The product performs well in severe kiln operating conditions with strong alkali and thermal load.Magnesia and spinel materials give the brick high refractoriness and stable structural performance. The brick also shows good resistance to clinker corrosion and thermal spalling.
LAR’s magnesia spinel brick is widely used in cement rotary kilns, lime kilns, and high-temperature industrial furnaces. The product helps improve kiln lining stability and extend service life.Manufacturers produce each magnesia spinel brick through pressing and high-temperature sintering. Many industrial users source these products from reliable magnesia spinel brick suppliers to maintain consistent performance in critical furnace zones.
Product Overview
Magnesia spinel refractory brick is a high-performance refractory material developed for high-temperature industrial furnaces that require excellent thermal stability and corrosion resistance. It is mainly composed of magnesia and spinel phases, which provide strong resistance against chemical attack, thermal shock, and furnace operating stresses.
Magnesia spinel bricks are widely used in cement rotary kilns, steelmaking furnaces, non-ferrous metal processing equipment, and other high-temperature applications. The spinel structure improves resistance to slag penetration and helps maintain the integrity of the refractory lining during long-term service. Compared with traditional magnesia bricks, these bricks offer better thermal shock resistance and improved structural stability.
Magnesia spinel refractory brick provides reliable performance under repeated heating and cooling cycles. Its excellent volume stability and corrosion resistance make it suitable for areas exposed to high temperatures, alkaline environments, and mechanical wear.
As professional magnesia spinel brick suppliers, LAR provides customized refractory solutions according to furnace conditions, operating temperatures, and application requirements. The products are manufactured with controlled raw materials and advanced production technology to ensure consistent quality, longer service life, and stable performance in demanding industrial environments.
Key Features
Strong Slag Resistance
The spinel phase improves resistance to basic slags. Magnesia spinel bricks withstand chemical attack in harsh steelmaking environments.
Excellent Thermal Shock Resistance
Spinel and magnesia absorb thermal stress effectively. The brick resists cracking during rapid heating and cooling.
High Temperature Stability
The magnesia spinel refractory brick maintains mechanical strength at temperatures up to 1700°C. The brick resists deformation under heavy furnace loads.
Reliable Mechanical Strength
The sintering process produces a high-density brick. The brick supports heavy furnace loads without bending or breaking.
Long Service Life
The material resists chemical corrosion, thermal stress, and mechanical wear. Users can reduce maintenance frequency and operational downtime.
Typical Product Types
Manufacturers provide several types of magnesia spinel bricks:
· Sintered magnesia spinel bricks
· Direct-bonded magnesia spinel bricks
· High-purity magnesia spinel bricks
· Impact-area bricks for converters and ladles
· Customized shapes and sizes
Each type is designed for specific furnace zones. Engineers select the appropriate grade based on temperature, slag type, and mechanical load.
Technical Characteristics
Item | Unit | MA-65 Brick | MA-70 Brick | Direct Bonded Spinel Brick |
MgO Content | % | ≥65 | ≥70 | ≥78 |
Al₂O₃ Content | % | 15–25 | 10–20 | 8–15 |
Bulk Density | g/cm³ | 2.90–3.00 | 2.95–3.05 | 3.00–3.10 |
Apparent Porosity | % | ≤18 | ≤17 | ≤16 |
Cold Crushing Strength | MPa | ≥45 | ≥50 | ≥60 |
Refractoriness Under Load | °C | ≥1600 | ≥1650 | ≥1700 |
Thermal Shock Resistance | — | Good | Excellent | Excellent |
Permanent Linear Change | % | ±0.4 | ±0.3 | ±0.2 |
Thermal Conductivity | W/m·K | 2.5–3.5 | 2.8–3.8 | 3.0–4.0 |
Standard Size | mm | 230×114×65 | 230×114×76 | Custom Size |
Application Area | — | Cement Kiln | Rotary Kiln | Burning Zone |
Values may vary depending on raw material quality and production methods. Professional magnesia spinel brick suppliers provide detailed specifications for each application.
Applications
Magnesia spinel bricks are widely used in high-temperature metallurgical processes:
· Steel converters
· Electric arc furnaces (EAF)
· Steel ladles
· Tapholes and impact zones
These bricks protect furnace linings and enhance operational stability. They reduce maintenance costs and extend furnace service life.
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Advantages Compared To Others
Type | Advantages | Application |
Magnesia Spinel Brick | Better slag resistance, high thermal shock stability | Critical steelmaking zones |
Traditional Magnesia Brick | Good high-temperature resistance, lower cost | Less demanding furnace areas |
Magnesia spinel bricks perform better in zones exposed to severe slag corrosion and rapid temperature changes. Traditional magnesia bricks are suitable for non-critical furnace sections.
Customization & Manufacturing
Magnesia spinel brick suppliers offer tailored solutions. They adjust:
· MgO and spinel content
· Brick size, shape, and density
· Porosity control
· Sintering process and temperature
These steps ensure each magnesia spinel refractory brick meets industrial standards. The final product delivers reliable, long-term performance in demanding furnace environments.
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