Process for desulfurizing combustion exhaust gases

Details Process for desulfurizing combustion exhaust gases Process for desulfurizing combustion exhaust gases

1980-03-14

1982-05-04

Vertiz, O. R.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

423166, 423240, 423490, C01B 1700

Patent

active

043281958

ABSTRACT:
An improved process for desulfurizing combustion exhaust gases of mainly coal containing sulfur oxides, HF and dust containing Al is provided, which process consists of four steps; a first step of contacting the gases with calcium carbonate or hydroxide in the form of slurry to convert the sulfur oxides into CaSO.sub.3 ; a second step of contacting O.sub.2 with the resulting slurry to convert CaSO.sub.3 into CaSO.sub.4 ; a third step of separating CaSO.sub.4 and mother liquor from the resulting slurry; and a fourth step of preparing a slurry of calcium carbonate or hydroxide to be employed in the first step, from the mother liquor, the pHs of the slurry and the mother liquor in the first and fourth steps being adjusted to 5 or higher by adding alkali such as sodium carbonate.
According to the present process, it is possible to prevent hindrance of HF and Al contained in dust to the reaction of SO.sub.2 -absorbent (CaCO.sub.3 or Ca[OH].sub.2) with SO.sub.2 gas, and thereby improve percentage desulfurization and also obtain a high quality gypsum.

REFERENCES:
patent: 3031262 (1962-04-01), Rosenbloom
patent: 3888968 (1975-06-01), Atsukawa et al.
patent: 3903243 (1975-09-01), Atsukawa et al.
patent: 3961021 (1976-06-01), Morita et al.
patent: 4166838 (1979-09-01), Tatani et al.

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