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Title: Conversion of alkali metal sulfate to the carbonate

Abstract

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.

Inventors:
 [1]
  1. (Woodridge, IL)
Issue Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
864096
Patent Number(s):
4309398
Assignee:
United States of America as represented by United States (Washington, DC) ANL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
conversion; 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; /423/310/

Citation Formats

Sheth, Atul C. Conversion of alkali metal sulfate to the carbonate. United States: N. p., 1982. Web.
Sheth, Atul C. Conversion of alkali metal sulfate to the carbonate. United States.
Sheth, Atul C. Fri . "Conversion of alkali metal sulfate to the carbonate". United States. https://www.osti.gov/servlets/purl/864096.
@article{osti_864096,
title = {Conversion of alkali metal sulfate to the carbonate},
author = {Sheth, Atul C.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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