Aluminum smelting furnaces mainly include reflex furnaces, rotary furnaces, and induction electric furnaces, with operating temperatures generally ranging from 700 to 1000 ℃. The damage to the lining of this type of furnace is mainly caused by the infiltration and erosion of aluminum liquid. The refractory materials used for aluminum smelting in the reflection furnace of the aluminum melting furnace are generally made of clay bricks, high alumina bricks, and corundum mullite bricks, and can also be made of high alumina refractory castables and refractory plastics.
Refractory materials used for aluminum smelting in the aluminum melting furnace reflector furnace:
Aluminum is usually melted using a fixed reflector furnace. The non working layer of the reflector furnace is constructed with refractory fiber felt and clay insulation bricks. The working layer above the melting pool is generally constructed with clay bricks, and can also be lifted with high alumina refractory casting material prefabricated blocks or poured on-site or rammed with high alumina refractory plastic. The working layer of the molten pool is made of different materials according to different usage requirements. Generally, high alumina bricks with an Al ₂ O ₂ content of over 75% are used for masonry, and high alumina refractory castables with an Al ₂ O ₂ content of 80% can also be poured into the overall working layer. When melting high-purity metallic aluminum, it is advisable to use high-purity mullite bricks, zircon bricks, or corundum bricks to build the working layer of the molten pool. The aluminum mouth, flow aluminum groove, and its lining should be placed. In order to resist the penetration and erosion of aluminum liquid, large silicon carbide bricks are generally used for construction. The refractory materials used in the insulation furnace and its flux and alloy processing room are basically the same as those used in the reflector furnace. When using electrolytic aluminum liquid as raw material, first use a siphon or vacuum bag to suck out the aluminum liquid from the bottom of the aluminum electrolysis tank, then transport it to the reflector furnace and pour it into the feeding port. After loading, oxygen is blown into the molten pool for dehydrogenation treatment while heating. The lining of siphon pipes is generally reinforced with fire-resistant fiber and lightweight fire-resistant castable as the insulation layer, which can also be 0.8g/cm ³ For the construction of clay based thermal insulation bricks, the working layer is generally constructed with dense clay bricks or corundum bricks. The insulation layer inside the vacuum bag is the same as that of the siphon, and its working layer is built with clay bricks or high alumina bricks. Under normal operation, the service life of the reflector furnace and insulation furnace is generally 2-5 years.
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