METHOD OF ACID PROCESSING OF PHOSPHATE RAW MATERIALS Russian patent published in 2018 - IPC C05B11/10 C05B1/04 

FIELD: agriculture.

SUBSTANCE: invention refers to agriculture. Method for acidizing the phosphate raw materials involves decomposing the phosphate raw materials with the excess of orthophosphoric acid in relation to the stoichiometric rate for CaO, separation of the resulting monocalcium phosphate from the mother liquor by means of filtration and returning the mother liquor to the head of the process, where calcium chloride is added to the phosphoric acid in the amount, which is necessary in order to maintain the pH of the mother liquor in the head of the process within the range 0.1–1.

EFFECT: invention allows to reduce the decomposition temperature of phosphate raw materials up to 20–25 ºC, to shorten the time of its decomposition to 10–15 min, and also not to use the step of suspension cooling before filtering it.

1 cl, 3 ex