Potassium Dihydrogen Phosphate Purification Process by Crystallisation in the Presence of Chelating Agents

This article describes the investigation of the purification process of potassium dihydrogen phosphate (KH2PO4, KDP) from iron and chromium impurities by crystallisation in the presence of different chelating agents – chelators. The best conditions of purification process such as a chelator type and its amount, reaction time were determined by experiments. The most effective chelating agents were selected. The requirements for raw material for the purification process were defined.