| 摘要 |
<p>PURPOSE:To make exhaust gas causing public nuisance innoxious by efficiently collecting and recovering a low b.p. heavy metal such as Hg, by cooling exhaust has generated by treating low b.p. heavy metal-containing waste with a direct current supply type melting treatment furnace in a moisture-containing state. CONSTITUTION:Dust 11 containing low b.p. heavy metals collected at the time of the incineration of urban garbage is moistened by a humidifier 23 while the moistended dust 11 receives melting treatment in a direct current supply type melting treatment furnace 12. The generated exhaust gas 13 is forcibly cooled by a cooler 14 and a mixture 16 of condensed Hg and soot is guided to a mercury refining press 17 to extract and recover metal Hg. The press residue 18 is returned to the melting treatment furnace 12. The exhaust gas 15 issued from the cooler 14 is guided to an adsorbing tower 20 and Hg is adsorbed and removed by Hg adsorbing activated carbon or a chelate resin to discharge the exhaust gas to the open air in a state generating no public nuisance. When moisture is imparted to dust in the humidifier 23, moisture in the exhaust gas becomes high and the dew point of said gas is raised and the precipitation effect of Hg in the cooler 14 increases.</p> |
