The production process of spherical activated carbon mainly consists of three core links: raw material shaping, thermal conversion treatment and pore regulation.
During the raw material shaping stage, petroleum asphalt or synthetic resin is usually selected as raw material. After being melted at high temperature, spherical precursors with diameters of 0.5-3mm are prepared by spray granulation or emulsification methods.
The thermal conversion process is divided into two key steps: Firstly, oxidation stabilization treatment is carried out at 200-350℃, and then the temperature is gradually increased at a controlled rate of 5℃/min to 600-800℃ to complete carbonization and form the basic framework structure.
During the activation stage, steam (800-950℃) or chemical activators (KOH/ZnCl₂) are used for pore regulation, and ultimately a specific surface area of 500-1200m²/g can be obtained. To further enhance product performance, post-treatment processes such as ammonia modification or metal loading can be implemented. The finished product must meet strict indicators such as sphericity > 95% and compressive strength > 10N per piece. Its unique regular spherical structure can reduce the bed pressure drop by more than 40% compared with ordinary activated carbon.
The key control points of this process include: the coordinated control of temperature and viscosity in the granulation stage, the precise optimization of the heating program in the carbonization process, and the dynamic adjustment of gas concentration in the activation stage. These technological innovations have enabled the products to demonstrate significant advantages in high-end application fields such as blood purification and military protection.
https://www.naturecarbon.com/wood-based-activated-carbon/spherical-activated-carbon.html
