PURPOSE: To remove efficiently a halogen compd. adsorbed by an ultrafine particle metallic oxide by providing a revolving blade having no central rotating shaft, rotating the revolving blade at a specified number of revolutions, and specifying the superficial velocity in a fluidized bed of a gas for forming the fluidized bed.
CONSTITUTION: A revolving blade 8 having no central rotating shaft is provided in the main body 1 of a fluidized-bed apparatus. The steam for forming the fluidized bed is supplied into the main body 1 of the apparatus from a supply port 2, and a metallic oxide, whereby a halogen compd. is adsorbed, from a supply port 5. By rotating the revolving blade 8, a fluidized bed 4 is formed, and the halogen compd. adsorbed by the ultrafine particle of metallic oxide is removed. At this time, the revolving blade 8 is rotated at 10W100r.p.m., and the superficial velocity in the fluidized bed of the steam is regulated to 0.1W30cm/ sec to remove efficiently the halogen compd.
NIWA TAKASUMI
TAKADA NAOKI
