(1) Granular or pelletized activated carbon

The raw materials for producing granular Suzhou air purification activated carbon, such as charcoal or coconut shell charcoal, are originally granular.

If the raw material for producing activated carbon is coal, it needs to be crushed first, then pressed into shape with a binder, and then carbonized. Before activation, it is crushed to the required size. Granular activated carbon is often made when high mechanical strength is required. In some cases, the strength of activated carbon depends not only on the raw material and binder, but also on the degree of activation and porosity. Highly activated activated carbon has a high pore volume, thus having a low density and low strength. Granular activated carbon is made from the fine powder of the starting material: first, the fine powder and binder are mixed in a heated mixer to form a flowable slurry, then extruded into a thick rope with a cross-section of ≥ 1 mm, dried, and then cut into granular pieces approximately equal in length to the diameter. Then it is chemically activated or carbonized at 400-500°C, and finally gas activated to obtain granular activated carbon.

The binder can be coal tar, wood tar, lignosulfonic acid, or a mixture of phenols and aldehydes or their condensates. The acidic components in the tar are neutralized with soda ash, which is beneficial for gas activation.

It is not commercially valuable to manufacture granular activated carbon from powdered activated carbon. However, granular carbon does not have the dust problem like powdered carbon, so it is more widely used in industry.

(2) platelike activated carbon

It is made by mixing powdered activated carbon with a small amount of acid clay, kaolin, aluminum powder, water glass, etc., and binder such as carboxymethyl cellulose, polyethylene acetate, etc., and pressing it into a plate, and then drying and high-temperature treatment.

(3) Paper and cloth activated carbon

It is made of powdered activated carbon and pulp fiber, asbestos fiber or plastic cloth, reinforcing material such as glass fiber and binder mixed, pressed into paper or cloth or corrugated paper shaped activated carbon. There are also activated carbon evenly spread on the paper layer or cloth layer of impregnated polymer such as polyacrylate as a binder, and then cover with another layer of non-woven fabric, hot pressed into activated carbon deodorant toilet paper.

(4) Honeycomb activated carbon

The cross sections of the two ends of the cylindrical activated carbon are made to have 1000~2000nm pores, so as to become a honeycomb activated carbon with a larger surface area.

The full literature on activated carbon is available at www.vikenton.com