Lightweight corundum castables are widely used in high temperature industrial fields. The following is an analysis of the core application areas:
Metallurgical industry
In the field of steel smelting, lightweight corundum castables are mainly used for the insulation layer of high-temperature furnaces and the lining of thermal equipment.
High temperature furnace lining
Used in blast furnace hot blast stoves, ladles, RH refining furnaces and other equipment as working layers or permanent layers. For example, the permanent layer of the ladle uses lightweight corundum castables (bulk density ≤ 2.2 g/cm³), which can reduce the weight of the equipment by 20%~30%, while reducing the temperature drop of molten steel (about 5~8℃), and extending the service life of the ladle to 200~300 heats.
Molten metal processing equipment
In scenarios such as molten iron pretreatment tanks and ladles, its thermal shock resistance (strength retention rate ≥80% after 30 times of rapid cooling at 1100°C) can cope with frequent temperature shocks and reduce downtime and maintenance due to cracks.
(3)Hot blast furnace vault
Its low thermal conductivity (0.8-1.2 W/m·K) can reduce heat loss, and combined with a load softening temperature of more than 1650°C, it ensures long-term operation of the equipment.
(4)Ladle permanent layer
The bulk density of 1.8-2.2 g/cm³ not only ensures the structural strength, but also reduces the overall equipment load and extends the service life of the ladle by more than 30%.
Petrochemical Industry
Cracking furnace and gasification furnace
The lining of the radiation section of the ethylene cracking furnace uses lightweight corundum castable (thermal conductivity ≤ 1.0 W/m·K), which can reduce the outer wall temperature of the furnace body to below 80°C and reduce fuel consumption by 10%~15%. In the coal gasification furnace, CO/H₂ permeability resistance (permeability <0.05×10⁻¹⁶ m²) can avoid lining failure caused by gas erosion and significantly improve energy efficiency.
Catalytic device
Used for the regenerator lining of the catalytic cracking unit (FCC), it can withstand high temperatures of 900~1200℃ and catalyst particle erosion, and its wear rate is reduced by more than 40% compared with traditional materials.
Converter lining】
The anti-CO/H₂ permeation capability (permeability <0.1×10⁻¹⁶ m²) effectively prevents catalyst poisoning and ensures the continuous operation period of the device for more than 3 years.
Power Industry:
(1) Cyclone separator lining for circulating fluidized bed boiler (CFB)
The wear resistance index (according to ASTM C704 standard) is ≤8 cm³, which can resist high-speed particle erosion. With a linear change rate of 0.3-0.5% (1400℃×3h), the sealing performance is stable.
(2) Flue expansion joint: The matching design of elastic modulus (3-5 GPa) and thermal expansion coefficient (5.5-6.5×10⁻⁶/℃) can effectively release thermal stress.
This material plays a key role in energy saving and consumption reduction in high-temperature industries through structure-performance synergistic optimization. Its application boundary continues to expand with the advancement of material technology, and it has significant economic benefits and environmental value.