Abstract
Granular activated carbons were prepared from wood pellet which were formed with an extruder from wood scrap by adding pitch and tar as a binder.The wood pellet was carbonized at 550°C and activated with steam in butch type rotaly kiln.The experimental conditions were as follows; 850°C of activation temperature, 0.55g. H2O/g.char.hr.of steam rate and 1.5-3.0 hours of activation time.A linear relationship was found between the activation yield and the activation time.The surface area and the adsorption capacities for methylene blue, iodine and benzene of the activated carbon at about 45% yield were 900m2/g, 200ml/g, 1300mg/g and 34%, respectively.On addition of the binder, the hardness of the activated carbon became higher than that of the activated carbon prepared only from wood scrap and was more than 95% by JIS method at about 45% yield.
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