The refractory materials used in aluminum industrial furnaces are generally refractory bricks and castables, but the selection varies greatly depending on the location. Refractory materials for aluminum industrial furnaces need to have high sintering strength, small pore diameter, low content of SiO2, Na2O, K2O, etc. The lining should also have good sintering performance at 800 ℃. The editor of Kerui Refractory Company has edited a list of commonly used refractory materials used in aluminum industrial furnaces for your reference.
The thermal insulation layer of alumina rotary kiln is laid with a layer of refractory fiber felt on the kiln shell, and then built with diatomaceous earth, floating bead bricks or light clay bricks. Now some of them use light refractory castables. The pre-tropical work lining is made of clay bricks, and the high-temperature calcination belt is made of high-alumina bricks or phosphate combined with non-fired high-alumina bricks.
At present, unshaped refractory materials have been widely used in the aluminum industry, such as refractory castables combined with low-calcium aluminate in the calcination zone, steel fiber reinforced wear-resistant castables in kiln mouth, kiln mouth cover, kiln tail, etc.
The flash furnace is to install heat-resistant steel anchor nails or ceramic anchors on the furnace shell, then lay a layer of 20mm thick refractory fiber felt, and finally cast 200 ~ 300mm thick refractory castable.
The working lining of the aluminum melting furnace reverberation furnace contacting the aluminum liquid is generally made of high aluminum brick with an Al2O3 content of 80-85%; when smelting high-purity metal aluminum, mullite brick or corundum brick is used. Install waste aluminum on the slope of the hearth, which is easy to erode and wear, and use silicon nitride in combination with silicon nitride bricks. The aluminum flow channel and the aluminum outlet are seriously eroded by aluminum liquid. Generally, self-bonding or silicon nitride bonded silicon carbide bricks are used, and zircon bricks are also used as linings. Furnace linings that do not come into contact with aluminum liquid generally use clay bricks, clay refractory castables or refractory plastics.
The lining material of induction furnaces for smelting aluminum and aluminum alloys is generally high-alumina dry ramming material, or silicon carbide is added to alumina dry ramming material, which is not easy to cause liquid leakage.