Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1985-02-27
1986-12-30
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
423166, 423555, C01B 1700
Patent
active
046328106
ABSTRACT:
The present invention is directed to a method for treating a waste gas to separate and recover gypsum and a dust therein, characterized by comprising the steps of causing the waste gas to pass through a dry dust collector; introducing the gas into a gas absorber, in which a slurry containing at least one of calcium hydroxide or calcium carbonate as an absorbent is employed to remove SO.sub.2 and the dust passed through the dry dust collector from the waste gas; blowing air into the resultant absorbing liquid in the gas absorber to oxidize the absorbing liquid and to thereby produce gypsum; delivering them to an absorbing liquid tank, in which the slurry mainly containing the gypsum grains is separated from the other slurry mainly containing the dust by partition walls disposed therein; and directly taking out the respective slurries separately from the absorbing liquid tank.
REFERENCES:
patent: 3903243 (1975-09-01), Atsukawa et al.
patent: 3929968 (1975-12-01), Taub
patent: 4080428 (1978-03-01), Holter et al.
patent: 4487784 (1984-12-01), Kurota et al.
patent: 4579069 (1986-04-01), Gay et al.
Onizuka Masakazu
Shimizu Taku
Shinoda Naoharu
Tatani Atsushi
Ukawa Naohiko
Heller Gregory A.
Mitsubishi Jukogyo Kabushiki Kaisha
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