Foam ceramic is a kind of porous ceramic similar to foam in shape, and it is the third generation of porous ceramic products developed after ordinary porous ceramics and honeycomb porous ceramics. This high-tech ceramic has three-dimensional connected pores, and its shape, pore size, permeability, surface area and chemical properties can be adjusted appropriately, and the products are like “toughened foam” or “porcelain sponge”. As a new type of inorganic non-metallic filter material, foam ceramic has the advantages of light weight, high strength, high temperature resistance, corrosion resistance, simple regeneration, long service life and good filtration and adsorption.