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According to the different uses of activated carbon, it can be made into powder and granular. Granular activated carbon can be divided into shaped carbon (for example: columnar, spherical, etc.) and non-shaped; according to the different activators used in production, it can be divided into physical activated carbon. Activated carbon by chemical method: According to different production materials, it can also be divided into woody charcoal and coal-based charcoal. Due to the large porosity of woody raw materials, there are many natural pores in the internal cell tissue (the specific surface area of charcoal is to make the activator easy to enter, and the contact reaction surface Da Yi Huo Jing, but coal is different (coal-based coke has only a small specific surface area, so the reaction surface with the activator is much smaller than that of charcoal. In short, the chemical method of wood powder activated carbon has the best decolorization performance. Fermentation, organic synthesis, sugar, pharmaceuticals, water purification and environmental protection and other fields, used to remove color bodies, colloids, absorb odors, prevent liquid turbidity, remove foam, and increase evaporation and crystallization speed.