High-temperature-resistant mullite brick prepared from aluminum slag and preparation method of high-temperature-resistant mullite brick

The invention relates to the field of mullite bricks, in particular to a high-temperature-resistant mullite brick prepared from aluminum slag and a preparation method thereof.The preparation method includes the steps that aluminum ash is used as a raw material, aluminum ash powder is compounded with silicon powder, fused white corundum fine powder and alpha-Al2O3 micro powder, sintering is conducted in the nitrogen atmosphere, and beta-SiAlON powder is formed on the surface of the aluminum ash powder; the preparation method comprises the following steps: sequentially treating hollow glass beads with a NaOH solution and dopamine hydrochloride to obtain dopamine modified hollow glass beads, then carrying out electrostatic self-assembly on the dopamine modified hollow glass beads and graphene oxide to prepare graphene oxide coated hollow glass beads, and preparing high-elasticity aerogel as a framework of the mullite brick by combining a sol-gel method and normal-pressure drying. Introducing aminated polydimethy