Conversion of alkali metal sulfate to the carbonate
- Woodridge, IL
A process for converting potassium sulfate to potassium carbonate in which a mixture of potassium sulfate and calcium oxide are reacted at a temperature in the range of between about 700.degree. C. and about 800.degree. C. with a gaseous mixture having a minor amount of hydrogen and/or carbon monoxide in a diluent with the calcium oxide being present in an amount not greater than about 20 percent by weight of the potassium sulfate to produce an aqueous mixture of potassium sulfide, potassium bisulfide, potassium hydroxide and calcium sulfide and a gaseous mixture of steam and hydrogen sulfide. The potassium and calcium salts are quenched to produce an aqueous slurry of soluble potassium salts and insoluble calcium salts and a gaseous mixture of steam and hydrogen sulfide. The insoluble calcium salts are then separated from the aqueous solution of soluble potassium salts. The calcium salts are dried to produce calcium sulfide, calcium bisulfide and steam, and then, the calcium sulfide and calcium bisulfide are converted to the oxide and recycled. The soluble potassium salts are carbonated to produce potassium carbonate which is concentrated and the precipitated crystals separated. The sulfur-containing compounds are further treated.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4309398
- OSTI ID:
- 864096
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20
700
800
alkali
alkali metal
amount
aqueous
aqueous mixture
aqueous slurry
aqueous solution
bisulfide
calcium
calcium oxide
calcium salts
calcium sulfide
carbon
carbon monoxide
carbonate
carbonated
compounds
concentrated
containing compound
containing compounds
conversion
converted
converting
crystals
degree
diluent
dried
gaseous
gaseous mixture
hydrogen
hydrogen sulfide
hydroxide
insoluble
metal
metal sulfate
minor
minor amount
mixture
monoxide
oxide
percent
potassium
potassium carbonate
potassium hydroxide
potassium salt
potassium sulfate
precipitated
process
produce
produce calcium
quenched
range
reacted
recycled
salts
separated
slurry
soluble
solution
steam
sulfate
sulfide
sulfur-containing
sulfur-containing compound
temperature
treated
weight