Light high-strength wall brick and preparation method thereof

The invention discloses a light high-strength wall brick. The light high-strength wall brick is prepared from, by weight, 170-190 parts of silica sand, 80-90 parts of cement, 35-45 parts of lime, 17-24 parts of phosphogypsum, 25-35 parts of coal ash, 320-350 parts of water, 0.3-0.5 part of aluminum powder and 25-30 parts of mica powder. Inorganic foaming is adopted as a foaming method and has better corrosion resistance, fire resistance and environmental friendliness compared with organic foaming. According to the wall brick prepared from the raw materials through the method, the bulk density reaches about 0.4 g/cm , the compressive strength reaches 1.8-2 Mpa, the heat conductivity is 0.08 W/m.K, and the sound insulating effect reaches 40 decibel.