The invention discloses a production method of
microcrystalline mullite type calcined kaolin, the prepared
microcrystalline mullite type calcined kaolin and application of the
microcrystalline mullitetype calcined kaolin. The method comprises the following steps: 1) taking high-iron
coal gangue with Fe2O3 content of more than or equal to 0.4% as a
raw material; adjusting to enable Al2O3 content in the raw materials to be greater than or equal to 30%; (2) crushing and
grinding the raw materials obtained in the step (1) to 100 meshes or above to obtain a mixed
powder, (3) adding water into themixed
powder, uniformly mixing to prepare a wet material, carrying out
ageing and mud extruding to prepare bricks, stacking the bricks on a
kiln car,
drying, and calcining the
kiln car in a
tunnel kiln at 800-1350 DEG C to obtain the microcrystalline
mullite type calcined kaolin. The calcined
kaolin product prepared by the production method of the microcrystalline mullite type calcined kaolin is high in whiteness, uniform in chemical components and stable in
microstructure, contains a large amount of mullite microcrystals, and is a preferred
raw material for
ceramic glaze, high-quality clay bricks, light mullite bricks and
ceramic fiber cotton.