Production of Potassium Sulphate by Conversion of Phosphogipsum and Potassium Chloride in Ammonia Solution

The possibility of obtaining potassium sulfate by converting calcium sulfate (phosphogypsum) and potassium chloride in an ammonia solution was investigated. The optimal conditions for the process at various concentrations of ammonia solution were determined. When using a 25% solution of NH 3 , the s...

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Bibliographic Details
Published in:Russian journal of applied chemistry 2020-03, Vol.93 (3), p.346-351
Main Authors: Goncharik, I. I., Gotto, Z. A., Navnyko, A. L., Kolbun, N. V.
Format: Article
Language:English
Subjects:
Ammonia
Calcium sulfate
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Consumption
Conversion
Gypsum
Industrial Chemistry/Chemical Engineering
Inorganic Synthesis and Industrial Inorganic Chemistry
Phosphogypsum
Potassium
Potassium chloride
Potassium sulfate
Stirring
Stoichiometry
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Summary:The possibility of obtaining potassium sulfate by converting calcium sulfate (phosphogypsum) and potassium chloride in an ammonia solution was investigated. The optimal conditions for the process at various concentrations of ammonia solution were determined. When using a 25% solution of NH 3 , the stirring time is 30–60 min, the consumption rate of KCl is 160% from stoichiometry. When using a 40% ammonia solution, the stirring time has practically no effect on the conversion, and the KCl consumption rate is only 120% from stoichiometry. The conversion temperature in both cases should be 15–20°C; the mass ratio of gypsum and ammonia should be 1 : (3–5).
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427220030052