Process for producing liquid combined fertilizers

摘要

The process for producing liquid combined fertilizers according to the present invention comprises neutralization of extraction-type phosphoric acid with an excess of gaseous ammonia taken in an amount of 1-1.2 parts by weight relative to the content thereof in the final product at a temperature of the reagents of from 60 DEG to 250 DEG C., mixing of the resulting neutralization products with a liquid phase consisting of water or ammonia water and a portion of the final product recycled to the process; said mixing is conducted under a pressure of 0.05-0.7 atm and at an excess of water in the liquid phase of 1.05-2.0 parts by weight relative to the content thereof in the final product; the process is carried out at a ratio of circulation of the final product of 2 to 40 and at a pressure differential at the stages of neutralization and mixing of from 0.1 to 6 atm. The process according to the present invention may be useful in the agriculture.