反应详情

According to another form of the invention the method includes the steps of dissolving urea in phosphoric acid to form a solution of a urea phosphoric acid adduct, adding a mixture of potassium salts and ammonium salts and/or urea to the solution while agitating the solution, adding a further quantity of phosphoric acid while the agitation is continued, and allowing the slurry obtained to cool and set to form a solid. In this form of the invention the solution of urea phosphoric acid adduct is agitated during the addition of the potassium salts and the ammonium salts and/or the urea during the addition of the further quantity of phosphoric acid.