| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of thermally regenerating waste gypsum cheaply by suppressing new facility investment as much as possible, by effectively utilizing the facilities of an existing asphalt plant. SOLUTION: A waste gypsum obtained by crushing and sorting waste gypsum boards is fed to a dryer 1 of the existing asphalt plant, instead of aggregate. At this time, while thermally regenerating the waste gypsum at a temperature at which gypsum dihydrate is changed to a hemihydrate gypsum by controlling the combustion amount of a burner 4, gypsum fine particle portion in the exhaust gas effluent from a dryer 1 is captured by a dry cyclone 8, a bag filter 9, and the like, and the captured gypsum fine particle portion is recovered together with the gypsum discharged from the dryer 1. Like this, if the facilities of an existing asphalt plant are utilized, waste gypsum can be cheaply thermally regenerated while suppressing new facility investment as much as possible. COPYRIGHT: (C)2007,JPO&INPIT
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