Method for treating combustion ashes

Details Method for treating combustion ashes Method for treating combustion ashes

1997-12-18

2000-03-07

Griffin, Steven P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423356, 423357, 423555, 4236585, 110344, C01F 1146

Patent

active

060336374

ABSTRACT:
A method is provided for treating ashes from the combustion of petroleum fuels by mixing the combustion ashes with water to produce a slurry; injecting either calcium oxide or calcium hydroxide into the slurry and reacting the calcium oxide or calcium hydroxide with the ammonium sulfate within the ashes to produce a slurry containing gypsum and ammonia; flowing the slurry containing gypsum and ammonia down from the top portion of packed column and air or steam up from the bottom portion of the packed column so that the air or steam strips the ammonia from the gypsum slurry; and separating the gypsum from the resulting ammonia-free slurry using a solid/liquid separator.

REFERENCES:
patent: 4111759 (1978-09-01), Didyez et al.
patent: 4140586 (1979-02-01), Kwasnoski et al.
patent: 4668250 (1987-05-01), Drese
Patent Abstracts of Japan, vol. 009, No. 134, (C-285), Jun. 8, 1985, JP 60-019086.
Patent Abstracts of Japan, vol. 010, No. 377, (C-392), Dec. 16, 1986, JP 61-171583.
Patent Abstracts of Japan, vol. 010, No. 377, (C-392), Dec. 16, 1986, JP 61-171582.
Chemical Abstracts, vol. 89, No., 22, Dec. 27, 1978, JP 53 035258.

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