CORE-SHELL TYPE GRANULAR ACTIVE CARBON WITH POWDERY CORE AND PREPARATION METHOD THEREOF

摘要

A preparation method of core-shell type granular active carbon with a powdery core comprises the following steps: (1) preliminary sizing: mixing an organic binding agent aqueous solution and powder active carbon and performing extrusion molding to obtain a granular material; (2) coating: forming a uniform inorganic coating layer on the outer layer of the granular material; (3) heat treatment: causing the organic binding agent in the material to undergo thermal decomposition so that the structure of the granular material of the core is damaged to form powder and the inorganic coating layer at the outer layer forms a hard coating layer to protect the powder from leakage; and (4) screening to obtain granular active carbon products with different specifications and having a powdery core. The prepared formed active carbon integrates the advantages of powdery active carbon and granular active carbon and thus achieves relatively high adsorption performance and excellent strength.