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 (United States)
- 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
alkali
metal
sulfate
carbonate
process
converting
potassium
mixture
calcium
oxide
reacted
temperature
range
700
degree
800
gaseous
minor
amount
hydrogen
carbon
monoxide
diluent
20
percent
weight
produce
aqueous
sulfide
bisulfide
hydroxide
steam
salts
quenched
slurry
soluble
insoluble
separated
solution
dried
converted
recycled
carbonated
concentrated
precipitated
crystals
sulfur-containing
compounds
treated
potassium carbonate
calcium salts
containing compound
metal sulfate
potassium sulfate
aqueous mixture
calcium oxide
gaseous mixture
carbon monoxide
alkali metal
aqueous solution
hydrogen sulfide
aqueous slurry
minor amount
potassium hydroxide
calcium sulfide
containing compounds
potassium salt
produce calcium
sulfur-containing compound
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