The invention particularly relates to light-weight and heat-isolation
mullite bricks and a preparation method thereof. The technical scheme is that the light-weight and heat-isolation
mullite bricks are prepared from the following raw materials in percentage by weight: 40 to 48 percent of flint clay, 14 to 38 percent of
kyanite, 6 to 16 percent of clay and 14 to 24 percent of alpha-Al2O3
fine powder, wherein a bonding agent is 15 to 20 percent by weight of the raw materials, and a pore-forming agent is 45 to 60 percent by weight of the raw materials. The preparation method comprises the following steps of firstly mixing the alpha-Al2O3
fine powder with the pore-forming agent, and carrying out
wet grinding for 8 to 10 hours to obtain homogenized mud; uniformly stirring the homogenized mud, the flint clay, the
kyanite, the clay and the bonding agent; carrying out aging, forming and baking; and preserving the heat at 1,325 to 1,450 DEG C for 3 to 5 hours to obtain the light-weight and heat-isolation
mullite bricks. The light-weight and heat-isolation mullite bricks and the preparation method thereof have the advantages of saving resources, being simple in process, and being environmentally-friendly; and the prepared light-weight and heat-isolation mullite bricks are high in
heat stability, low in heat conduction coefficient, low in
volume density, low in after-burning
linear shrinkage ratio, high in compression strength and good in heat insulation and
isolation effect.