A refractory ball is a spherical piece of refractory material, typically used in industrial furnaces or high-temperature equipment.
Classification of refractory ball
Fireproof balls can be categorized as follows according to the different materials:
High alumina refractory ball
Taking high alumina bauxite as the main raw material, the content of Al₂O₃ is usually 50% to 80%. High refractoriness (usually above 1750℃). Good thermal shock resistance and compressive strength. Acid and alkali corrosion resistance, suitable for most industrial furnaces. Widely used in hot air furnace, chemical tower packing, metallurgical furnace lining and other fields.
Corundum refractory ball
Using electro-melted corundum or sintered corundum as the main raw material, with Al₂O₃ content more than 90%. High refractoriness (usually more than 1800℃). High strength and wear resistance, strong slag resistance. Excellent thermal conductivity, suitable for high temperature and heavy load. Used in high temperature environments such as steel smelting, electric melting furnace, gasification furnace, etc.
Mullite refractory balls
Mullite is the main component (3Al₂O₃-2SiO₂). High fire resistance (1700℃-1800℃). Excellent resistance to thermal shock. Low coefficient of thermal expansion and good chemical stability. Suitable for high temperature industrial furnace, catalyst carrier, etc.
Dinas refractory ball
Silicon dioxide (SiO₂) is the main raw material, and the SiO₂ content is usually higher than 93%. High refractoriness (close to 1700°C). Possesses excellent volume stability at high temperatures. Not suitable for rapid cooling and heating, poor resistance to thermal shock. Typically used in high temperature areas such as glass kilns and coke ovens.
Magnesium refractory ball
With magnesium sand or electro-melted magnesium as the main raw material, the MgO content is more than 80%. High refractoriness (usually above 1800℃). Strong resistance to alkali erosion. Excellent slag resistance, especially suitable for alkaline environment. Suitable for steel smelting, converter and other alkaline slag.
Refractory ball characteristics
- High fire resistance
Usually, the refractoriness of refractory ball can reach more than 1580℃, which can be used for a long time in high temperature environment without deformation or cracking.
- Excellent resistance to thermal shock
It can withstand the sudden rise and fall of temperature, and will not be easily torn due to thermal expansion and contraction.
- High mechanical strength
Resists compression and abrasion well, can maintain stability under heavy loads.
- Resistance to chemical erosion
Resistant to erosion by acids, alkalis and slags, suitable for use in difficult chemical environments.
- Good thermal conductivity
Good heat transfer, improves the thermal efficiency of equipment and reduces energy consumption.
- long service life
Due to its good erosion resistance and mechanical strength, the refractory ball can be used in industry for a long time, reducing the frequency of maintenance and replacement.
Where is it used?
- Blast furnace and converter
Refractory balls are usually used in the heat storage chamber of a blast furnace as a filler to absorb and release heat to increase the thermal efficiency of the equipment. In a converter, they can be used as an additional refractory lining material.
- Chemical industry
Used as a catalyst carrier or tower filler, mainly used to fill the high temperature reaction tower and support the catalyst in the chemical reaction process.
- Ferrous metallurgy and metallurgical industry
Used in high temperature equipment to prevent direct corrosion of the refractory lining by molten metal or slag and to extend the life of the equipment.
- Other equipment
Used in waste gas purification equipment to improve the efficiency of the waste gas purification process. For example, as a catalyst support layer in desulfurization and denitrification reactors.