
Characteristics of Magnesia bricks (China)
Name of indicator | M-98 | M-97A | M-97B | M-95A | M-95B | M-91 | M-89 | |
---|---|---|---|---|---|---|---|---|
MgO/% | ≥ | 97.5 | 97.0 | 96.5 | 95.0 | 94.5 | 91.0 | 89.0 |
SiO2/% | ≤ | 1.00 | 1.20 | 1.50 | 2.00 | 2.50 | / | / |
CaO/% | ≤ | / | / | / | 2.00 | 2.00 | 3.00 | 3.00 |
Apparent porosity /% | ≤ | 16 | 16 | 18 | 16 | 18 | 18 | 20 |
Bulk density (g/cm³) | ≥ | 3.00 | 3.00 | 2.95 | 2.90 | 2.85 | ||
Cold crushing strength/MPa | ≥ | 60 | 60 | 60 | 60 | 50 | ||
0.2MPa Refractoriness Underload/℃ | ≥ | 1700 | 1700 | 1650 | 1560 | 1500 | ||
Permanent Linear Change/% | Xmin~Xmax | 1650℃*2h -0.2-0 | 1650℃*2h -0.3-0 | 1600℃*2h -0.5-0 | 1600℃*2h -0.6-0 |
Characteristics of Magnesia bricks (Russia)
Name of indicator | П-91 | П-90 | П-89 |
---|---|---|---|
MgO, %, ≥ | 91 | 90 | 89 |
CaO, %, ≤ | 3 | 4 | 4,5 |
SiO2, %, ≤ | 3 | 3 | - |
Fe2O3, %, ≤ | 2,5 | 2,5 | - |
Open porosity, %, not more than | 22 | 23 | 26 |
Compressive strength, N/mm², not less | 60 | 50 | 40 |
Refractorines under load,, °С, not lower | 1550 | 1550 | 1500 |
Description of magnesia bricks
Magnesia bricks are fired from magnesium manganates mixed with special additives and have a magnesium oxide content of at least 90%.
Magnesia brick is resistant to basic slags. It is highly refractory (2000° C), strong, dense, but has little heat resistance and is expensive.
Преимущества периклазового (Магнезитового) кирпич
Magnesia brick is a basic refractory brick with high resistance to alkali slag such as CAO and FEO, and is often used as a masonry material for main kilns.
The thermal conductivity of magnesia bricks is several times higher than that of clay bricks, but the thermal conductivity of magnesia bricks decreases with increasing temperature.
The fire resistance of magnesia bricks is above 2000 degrees Celsius. Magnesia brick is an excellent fireproof material that can withstand exposure to high temperatures without losing structural strength.
Magnesia refractory brick has a long service life due to its resistance to high temperature and chemical attack. It is not easily damaged or destroyed and can stably perform the function of fireproof construction for a long time.
Application of Magnesia Bricks
In the steelmaking process, magnesia bricks are widely used in the lining and chimneys of converter furnaces, electric furnaces, heavy fuel oil heating furnaces and other equipment to ensure safe operation of the equipment.
Magnesia bricks are also widely used in light metal smelting process, such as lining and protecting aluminum electrolyzers, aluminum alloy furnaces, magnesium alloy furnaces and other equipment.
Magnesia bricks can also be used in glass melting furnace. OH is also used as lining and chimney parts for furnaces, crucibles and pipes in the glass industry to ensure the quality and efficiency of glass production.
Magnesia bricks can be used in sulfuric acid conversion furnaces, flue gas desulfurization equipment and other high-temperature and highly corrosive equipment to increase their service life.
