Spherical active carbon and preparation method thereof

Abstract

The invention relates to the field of active carbon preparation, and discloses spherical active carbon and a preparation method thereof. The method comprises the following steps: (1) mixing sulfonatedasphalt and an activating agent, and carrying out spray granulation on the obtained mixed solution to obtain mixed microspheres; (2) carrying out microwave activation on the mixed microspheres to obtain active microspheres; and (3) removing impurities from the active microspheres to obtain spherical active carbon, wherein the activating agent is potassium hydroxide, and the temperature of spray granulation is 600-1000 DEG C. The preparation method is simple and rapid, and the prepared spherical active carbon has the advantages of good sphericity, large specific surface area, uniform and controllable pore diameter, uniform particle size distribution and excellent adsorption performance.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a spherical activated carbon and a preparation method thereof. Background technique [0002] Spherical activated carbon has a series of advantages such as large specific surface area, fast adsorption and desorption speed, good sphericity, uniform packing density, high strength, and corrosion resistance. , environmental protection, military and other fields have broad application prospects. [0003] In the current spherical activated carbon preparation method, for example, CN101143720A discloses a method for preparing activated carbon microsphere adsorption material after thermal condensation into spheres, but the mesophase microspheres formed by thermal condensation into spheres are difficult to separate from the solvent, and It is easy to stick together during the treatment process, resulting in a decrease in sphericity, and the final prepared activated carbon has po...

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Problems solved by technology

[0003] In the current spherical activated carbon preparation method, for example, CN101143720A discloses a method for preparing activated carbon microsphere adsorption material after thermal condensation into spheres, but the mesophase microspheres formed by thermal condensation into spheres are difficult to separate from the solvent, and It is easy to stick together during the process, resulting in a decrease in sphericity, and the final prepared activated carbon has poor sphericity and small specific surface area.

CN103693641A discloses a method for preparing spherical activated carbon with water-soluble pitch. In order to avoid material coking and blocking the nozzle at the nozzle, it needs to be granulated by low-temperature spraying, and then carbonized and activated. However, due to the low temperature of pitch forming, carbonization and activation The process is longer, resulting in partial cracking and adhesion of the final spherical activated carbon

In other processes for preparing spherical activated carbon from pitch, external heat sources are generally used in the heat treatment process. Due to the transfer of heat from the outside to the inside and the transfer of the volatilized gas from the inside to the outside, the temperature is uneven, the reaction progress of the inside and outside of the material is different, and the inside of the material is rigid. When the reaction starts to produce pores, the external reaction of the material is excessive, which causes the pores to expand or even collapse, the specific surface area is reduced, the reaction time is prolonged, and it is not conducive to industrial production.

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