Patent ID: 8475558

Claim:
A process for manufacturing a solid, particulate fertilizer based on potassium phosphate of the formula K 3 H 3 (PO 4 ) 2, said process comprising i) providing agriculturally acceptable raw material essentially consisting of monopotassium phosphate (KH 2 PO 4 , MKP); ii) providing agriculturally acceptable raw material essentially consisting of potassium hydroxide (KOH); iii) adding water to said MPK in an amount of from 20 to 100 wt%, based on dry weight of the MKP; iv) adding said raw KOH to said MKP and water from step iii) in an amount of from about 17 wt% to about 23 wt%, based on dry weights of KOH and MKP; v) heating the mixture of step iv) under movement at temperatures of up to about 140° C., comprising vacuum, until a homogeneous material containing from about 0.2 wt% to about 8 wt% water is obtained; and vi) cooling the mixture of step v) down to ambient temperature; thereby obtaining the particulate fertilizer based on potassium phosphate, freely flowing and without tendency to cake.