Studies were made on the manufacturing conditions of activated carbon pellets by externally heated rotary kiln using charcoal powder generated in the crushing and screening processes of rubber wood charcoal and palm kernel shell charcoal, and the fol-lowing results were obtained.
(1) The generated activated carbon pellets has higher methylene blue decoloring power and lower activation yield and hardness with decreasing rate of palm kernel shell char-coal fraction. In the case of rubber wood charcoal used solely, in particular, the hardness of activated carbon pellets is lower than JIS standard hardness (90%).
(2) In these studies, it appeared clear that the activated carbon pellets having methylene blue decoloring power of 150 to 200m
l/g and hardness of 90% or more are able to be manufactured in following conditions:
Raw material charcoal grain: 200 mesh or smaller
Mixing ratio rubber wood/palm=1/1
Ratio of refined coal tar to charcoal: 40wt%
Drying temperature of charcoal pellets: 150°C
Carbonization temperature: 500°C
Activation temperature: 1, 000°C
Charging rate ratio: steam/charcoal=3/1
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