Mullite material as well as preparation method and application thereof

The invention relates to a mullite material as well as a preparation method and application thereof, the method comprises the following steps: mixing high-alumina fly ash, alkali liquor and an inhibitor, carrying out stirring reaction, and then carrying out solid-liquid separation to obtain a solid phase, namely the mullite material; the inhibitor comprises dodecyl dimethyl benzyl ammonium chloride, sodium n-hexadecyl sulfate, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, dodecyl dimethyl betaine, dodecyl trimethyl ammonium bromide, methyl ditallow acyl ethyl-2-hydroxyethyl ammonium methyl sulfate, polyquaternium-16 or cationic guar gum. According to the method provided by the invention, the alkaline leaching reaction conditions are controlled and the inhibitor is added into the alkaline solution, so that water-soluble sodium (potassium) silicate and sodium (potassium) aluminate generated in the alkaline leaching process can be in a metastable state to inhibit conversion of the