Alumina foam ceramic filter is made of high quality and high purity alumina. It is made of unique formula and advanced environmental protection technology. It has uniform three-dimensional network structure, high strength, stable texture, no slag, high temperature resistance and thermal shock resistance. Strong and excellent performance. Mainly used in the purification process of aluminum and aluminum alloy production, also applied to various gas-solid, liquid-solid separation media, catalyst carrier, burner and sound-absorbing environmental protection; filter can make aluminum liquid more evenly filled In the cavity, the molten metal has a high turbulence tendency during casting, and is finally converted into a very stable laminar flow through the turbulent flow of the three-dimensional pore structure. The laminar flow has better filling of the cavity, which reduces the impact corrosion of the metal solution on the casting cavity, and significantly reduces the scrap rate, reduces the production cost, and improves the labor productivity.