Production of Potassium Sulphate by Conversion of Phosphogipsum and Potassium Chloride in Ammonia Solution
И. И. ГончарикInstitute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, 220072, Minsk, BelarusЗ. А. ГоттоInstitute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, 220072, Minsk, BelarusA. L. NavnykoInstitute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, 220072, Minsk, BelarusN. V. KolbunInstitute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, 220072, Minsk, Belarus
2020en
ABI
Abstract
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 NH3, 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).
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