In high-temperature industrial fields such as steel, cement, and glass, there is a key material called “high-temperature armor” – fused rebonded magnesia-chrome bricks.
1.What is fused rebonded magnesia-chrome brick?
It’s made primarily from magnesium oxide (MgO) and chromium oxide (Cr₂O₃) using a unique process called “electric melting-crushing-forming-sintering.”
First, the raw materials are melted in an electric arc furnace at temperatures exceeding 2000°C, forming dense molten particles. These particles are then crushed and shaped, and then fired at high temperatures to reconnect the particles. The result is a refractory material with a uniform structure and stable performance.
fused rebonded magnesia-chrome brick
This process, unlike traditional sintered bricks, results in finer grains and fewer pores within the material, resulting in performance far exceeding that of ordinary refractory materials.
2.Why can it become the “hard core support” of high temperature industry?
High-temperature industrial production environments can be described as “extremely challenging.” Temperatures often reach over 1600°C, accompanied by multiple challenges such as slag erosion, thermal shock, and mechanical wear.
Fused rebonded magnesia-chrome bricks, with their three core properties, are the unmatched choice in these environments.
First and foremost is its extreme high-temperature resistance
The periclase (MgO) and chromite phase (MgO·Cr₂O₃) in the material both have melting points exceeding 2000°C. They can maintain structural stability at temperatures of 1700°C without softening or deforming, providing a solid “lining barrier” for equipment.
Secondly, it offers excellent corrosion resistance
During steelmaking, slag contains highly corrosive substances such as iron oxide and calcium oxide, which continuously erode refractory materials.
refractory material
The chromium ore phase in fused rebonded magnesia-chrome bricks reacts with the slag, forming a dense “protective film” that prevents further slag penetration and extends their service life by 2-3 times that of ordinary bricks.
Finally, it offers excellent thermal shock resistance
During startup and shutdown, equipment like cement rotary kilns and glass melting furnaces experience rapid temperature fluctuations (temperature differences can reach over 500°C). Ordinary materials are susceptible to cracking due to thermal stress.
Electrofusion, combined with the low thermal expansion coefficient and high toughness of magnesia-chrome bricks, allows them to withstand repeated thermal shocks, reducing equipment maintenance frequency.
3.Application scenario: High temperature protection from steel to cement
Fused rebonded magnesia-chrome bricks are found throughout the core battlefields of high-temperature industries.
In the steel industry, they serve as the “hearth guardians” of converters and electric furnaces. They come into direct contact with molten steel and slag at 1600°C, ensuring a safe and efficient steelmaking process.
In the cement industry, they protect the “firing zone” of rotary kilns—where chemical reactions occur at temperatures reaching 1450°C. The bricks’ wear and corrosion resistance ensures long-term kiln operation.
In the glass industry, the regenerators of melting furnaces must withstand the erosion of high-temperature gases. Fused rebonded magnesia-chrome bricks, with their excellent high-temperature strength, serve as the “skeletal material” of these regenerators.
refractory bricks
From steelmaking to cement production, from glass melting to non-ferrous metal smelting, their silent support is indispensable.
4. The Future: Evolution of More Efficient and Environmentally Friendly Materials
As industry transitions toward greener and more intelligent processes, fused rebonded magnesia-chrome bricks are also evolving. In the future, they will continue to support the high-temperature industry towards a more efficient and sustainable development stage with their high performance and long lifespan.
From “high-temperature armor” to “industrial cornerstone,” fused rebonded magnesia-chrome bricks, though rarely seen by the public, quietly guard the “high-temperature heart” of modern industry and become an indispensable key material driving industrial progress.
