Aluminum-silicon composite prefabricated member with different densities and preparation method thereof

The invention belongs to the technical field of refractory materials, and particularly relates to an aluminum-silicon composite prefabricated part with different densities and a preparation method thereof, and the composite prefabricated part is prepared from an alumina castable and a light mullite castable. Wherein the alumina castable plays a role in supporting a structure, and the light mullite castable plays a role in preserving heat. The light mullite brick is prepared from the following raw materials: alumina with the particle size of 5 to 3mm, alumina with the particle size of 3 to 1mm, alumina with the particle size of 1 to 0.088 mm, alumina with the particle size of less than 0.088 mm, light mullite with the particle size of 5 to 3mm, light mullite with the particle size of 3 to 1mm, light mullite with the particle size of 1 to 0.088 mm, light mullite with the particle size of less than 0.088 mm, aluminum oxide micro powder, silicon dioxide micro powder, A600 cement, sodium tripolyphosphate, sodium h