A conversion method using a closed cycle for production of potassium dihydrogen phosphate from available feedstock, i.e., hot-leached potassium chloride (98%) or its mixture with sodium chloride, purified extraction phosphoric acid, and technical sodium carbonate (bicarbonate), with separate addition of the reagents is reported. Solubility diagrams of the KCl–NaH2PO4–NaCl–KH2PO4–H2O system with joint and separate addition of the starting reagents are calculated. A product of higher quality with lower chloride content is shown to be produced in the second instance. The calculations are confirmed by laboratory experiments.
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Translated from Khimicheskie Volokna, No. 3, pp. 15-20, May—June, 2020.
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Kirish, K.S., Vlasov, P.P. & Dmitrevskii, B.A. Production of Potassium Phosphate by a Conversion Method. Fibre Chem 52, 148–153 (2020). https://doi.org/10.1007/s10692-020-10170-1
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DOI: https://doi.org/10.1007/s10692-020-10170-1