Coal based activated carbon is developed through a series of processes such as carbonization, cooling, activation, and washing. Its appearance is generally black cylindrical activated carbon, amorphous coal particle activated carbon, also known as crushed carbon. Cylindrical activated carbon, also known as columnar carbon, is generally made from powdered raw materials and binders, which are mixed, extruded, and then carbonized, activated, and other processes. It can also be extruded using powdered activated carbon and binder. It has developed pore structure, good adsorption performance, high mechanical strength, easy to regenerate, and low cost; Used for the purification of toxic gases, waste gas treatment, industrial and domestic water purification treatment, solvent recovery, and other aspects.