Magnesia-chrome bricks are alkaline refractory materials mainly composed of magnesium oxide (MgO) and chromium dioxide (Cr₂O₃). The mineral composition is mainly composed of magnesite and spinel, with the content of Cr₂O₃ ranging from 30% to 45% (CaO ≤ 1.0% to 1.5%). This product has the characteristics of high refractoriness, high high-temperature strength, strong resistance to alkaline slag erosion, excellent thermal stability, and certain adaptability to acidic slag. It is produced by using sintered magnesia and chromite ore as raw materials, through high-temperature sintering or inorganic magnesium salt solution combination processes. Directly combined magnesia-chrome bricks need to be fired at ≥1700℃ to achieve direct mineral phase combination.
According to the grade, it is divided into four levels: MGe-20, MGe-16, etc. It complies with the standards of YB844-75 and GB2074-80, and is widely used in flat furnaces, electric furnaces, furnace external refining furnaces, and non-ferrous metal melting furnaces in the metallurgical industry. It is also used in high-temperature equipment such as cement rotary kilns and glass kiln heat storage chambers.
MgO% (≥): 45 - 65
Cr2O3% (≥): 8 - 16
Apparent porosity% (≤): 19 - 21
Cold pressing strength (MPa): 20 - 35
Standard size: 230*114*65 millimeters
The advantages of magnesia-chrome bricks Outstanding fire resistance performance
Magnesia-chrome bricks possess excellent refractory properties and can withstand temperatures above 1500°C. Therefore, they are widely used in high-temperature industrial fields such as metallurgy, steel production and cement manufacturing.
Excellent corrosion resistance
As a material resistant to alkali and fire, magnesia-chrome bricks possess strong corrosion resistance. Especially in the cement industry, they are often used in the manufacturing of high-temperature equipment such as rotary kilns, effectively preventing chemical corrosion and wear.
Excellent thermal shock stability
The direct-bonded magnesia-chrome bricks have excellent thermal shock resistance. They are less likely to crack under sudden temperature changes or rapid cooling. This characteristic makes them widely used in the inner linings of high-temperature kilns.
Strong anti-wear performance
Due to its high hardness and high density, it is not prone to wear when directly combined with magnesia-chrome bricks during use. It has excellent anti-wear properties, which can increase the service life of the equipment.
It has a wide range of applications.
The direct bonding magnesia-calcium silicate bricks can be used as the inner lining of high-temperature furnaces in various industries such as steel, cement and glass, and can be customized according to the needs of different industries.
High safety
The direct bonding magnesia-calcium silicate brick is a kind of fire-resistant material that complies with environmental protection requirements. When used, it will not cause pollution to the environment. In addition, it also has safety features such as fire resistance, earthquake resistance, and wind resistance.
Application of Magnesia-Chrome Bricks
Metallurgical Industry
Magnesia-chrome refractory bricks are used as linings and plates in metallurgical furnaces, converters, electric furnaces, hot blast stoves, furnaces and furnace bottoms. They can withstand metal corrosion during the smelting process and high temperatures, protecting the structure of the furnace and extending the service life of the equipment.
Steel smelting
The molten semi-composite magnesia-chrome bricks are widely used in the steel smelting industry, such as steel ladles, iron heads, pouring nozzles and other high-temperature equipment.
Cement industry
Magnesia-chrome bricks can be used as linings and insulation materials for cement kilns and rotary kilns, and can resist the erosion caused by alkaline gases and substances produced at high temperatures.
Chemical Industry
Magnesia-chrome bricks can be used as inner linings and insulation materials for high-temperature reactors, pipelines and hydrogenation equipment in the coal chemical industry, and they have excellent corrosion resistance.
