Removal of sulfur dioxide from waste gases by aqueous suspensions of dolomitized phosphates
The oxidation of the SO/sub 2/ from waste gases to form H/sub 2/SO/sub 4/ which reacts to decompose the carbonate in the phosphate rock suspensions to sulfates is catalyzed by the presence in the ores of compounds of Mg, Fe, Ca, etc. CaSO/sub 4/ is precipitated in the form of crystals while the MgSO/sub 4/ that is formed is passed into solution. The proposed reaction is CaMg(CO/sub 3/)/sub 2/ + 2H/sub 2/SO/sub 4/ ..-->.. CaSO/sub 4/ + MgSO/sub 4/ + 2H/sub 2/O + 2CO/sub 2/. The reaction rate is controlled by the oxidation of SO/sub 2/ which is dependent upon the temperature and the concentration of O/sub 2/ in the liquid phase of the suspension. 100% oxidation of the SO/sub 2/ is realized if the optimum temperature range for the process is 60 to 90/sup 0/C and the oxygen concentration in the gas is >5%. Under experimental conditions, a froth absorber with 3 or 4 traps was found to insure complete absorption of the SO/sub 2/. (BLM)
- OSTI ID:
- 7081939
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 52:11; ISSN JAPUA
- Country of Publication:
- United States
- Language:
- English
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424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200 -- Environment
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54 ENVIRONMENTAL SCIENCES
ADSORPTION
CHALCOGENIDES
CHEMICAL REACTIONS
DISPERSIONS
GASEOUS WASTES
MANAGEMENT
MIXTURES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOSPHATE ROCKS
PROCESSING
ROCKS
SEDIMENTARY ROCKS
SLURRIES
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
SUSPENSIONS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES