Aluminum-chromium-zirconium composite air bricks and manufacturing method thereof

The invention discloses aluminum-chromium-zirconium composite air bricks and a manufacturing method thereof, and relates to industrial bricks and a manufacturing method thereof. Each brick comprises the following chemical components in percentage by weight: more than or equal to 72 percent of Al2O3, more than or equal to 15 percent of Cr2O3, more than or equal to 4 percent of ZrO2, more than or equal to 5 percent of mullite, more than or equal to 3 percent of TiO2, and more than or equal to 1 percent of Fe2O3. The aluminum-chromium-zirconium composite air brick comprises the following processsteps: crushing a raw material chrome corundum until the largest granule has the grain size of less than or equal to 5mm; performing deironization, magnetic separation and sieving, and feeding granules with the grain size of 0.5 to 5mm into a blender mixer to mix the granules and zirconium oxide, rutile, mullite and a binding agent; grinding granules with 0 to 40 meshes into granules of -320 meshes, performing magnetic separation and deferrization on the granules, mixing the granules and the zirconium oxide, rutile, mullite and the binding agent, standing for 25 minutes and performing brick-pressing operation; and drying the bricks at the temperature of 40 DEG C, and firing the bricks in a high-temperature kiln at the temperature of between 1,600 and 1,800 DEG C. The aluminum-chromium-zirconium composite air bricks are applied to an airheater in oil field, a scrap metal incinerator and a copper converter, and the service life of the furnaces is improved.