METHOD OF PRODUCING POTASSIUM PHOSPHATE-BASED FERTILISER Russian patent published in 2013 - IPC C05B17/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing granular fertiliser containing potassium phosphate. The method of producing solid granular fertiliser based on potassium phosphate with formula K₃H₃(PO₄)₂ involves: i) providing agriculturally acceptable raw material essentially consisting of monopotassium phosphate denoted by KH₂PO₄ or MKP; ii) providing agriculturally acceptable raw material essentially consisting of potassium hydroxide KOH; iii) adding water to said MKP in amount of 20-100 wt % of dry mass of MKP; iv) adding said crude KOH to said MKP and water from step iii) in an amount from about 18 wt % to about 22 wt % of the dry mass of KOH and MKP; v) heating the mixture from step iv) while slowly stirring to temperature between about 90°C and 140°C in a vacuum to obtain a homogeneous material consisting of 0.2 wt % - 8 wt % water; and vi) cooling to ambient temperature, thereby obtaining potassium phosphate-based granular fertiliser which flows freely without a tendency to caking.

EFFECT: invention enables to obtain granular, easy to handle, free-flowing solid fertiliser with the desired level of hygroscopicity and a low tendency to caking, which is an excellent source of potassium and phosphorus for plants.

15 cl, 2 dwg, 3 ex