The invention relates to an aluminum-
silicon light heat insulation
brick and a preparation method thereof. The preparation method comprises the following steps of: uniformly mixing 40-55 percent by weight of light
alumina aggregate, 25-40 percent by weight of
bauxite chamotte, 5-12 percent by weight of
calcium aluminate cement, 8-13 percent by weight of
organic polymer, 2-5 percent by weight of
silicon powder, 0.05-0.15 percent by weight of water
reducing agent and 15-25 percent by weight of water,
calendering and molding by
casting; curing under the condition of
room temperature for 24-48 hours, demolding and
drying at the temperature of 100-120 DEG C for 20-36 hours; and preserving heat at the temperature of 1,400-1,550 DEG C for 3-5 hours to obtain the aluminum-
silicon light heat insulation
brick. The preparation method has the advantages of wide raw materials, simple process and low production cost; the prepared aluminum-silicon light heat insulation
brick has the advantages of high
compressive strength,
low volume density, low heat
conductivity, high using temperature, low re-burning linear change rate, high
thermal shock stability and the like; the product is applied to various
industrial furnace heat insulation
layers, has a wide application range and remarkably-reduced
energy consumption and temperature outside a furnace, and can be safely and effectively produced.