METHOD OF PURIFYING SOLUTIONS OF POTASSIUM DIHYDROGEN PHOSPHATE FROM D-METALS AND ALUMINUM IMPURITIES Russian patent published in 2019 - IPC C01B25/30 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of purifying solutions of potassium dihydrogen phosphate from d-metals and aluminum impurities. Method is carried out by co-crystallisation of impurities by concentration thereof in a macrocomponent manifold and includes the following steps: cooling saturated at 40–50 °C starting solution of initial potassium dihydrogen phosphate at rate of 1–5 °C/min and while stirring at rate of 200–500 rpm until temperature is set to 5–20 °C, further holding the solution while stirring at the same temperature and separating the crystals from the purified potassium dihydrogen phosphate solution by filtration.

EFFECT: technical result consists in creation of technological and economic process of obtaining high-purity potassium dihydrogen phosphate, used as raw material for high-speed growth of large-size monocrystals.

1 cl, 3 ex