| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for continuously manufacturing fired cellular pumice having a specific gravity of 0.18-0.31 from a natural pumice produced at South Kyushu district (in Japan). SOLUTION: The natural pumice having 2-15 mm diameter and produced at the South Kyushu district is supplied to a fluidized bed from an exhaust side of an internal combustion type heating medium fluidized bed furnace and is fired and foamed at 900-1,100°C and the resultant fired and foamed pumice having a loose apparent specific gravity of 0.18-0.31 is recovered by a pumice recovering apparatus provided on the side of the furnace cylinder and the fired and foamed fine pumice is recovered by a cyclone dust collector and a bag filter dust collector. As the heating medium for the internal combustion type fluidized bed furnace, the natural pumice which is the raw material is used. COPYRIGHT: (C)2004,JPO
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