Method for producing triple superphosphate fertilizers

Abstract

The subject of the application is a method for producing phosphate fertilizers of the triple superphosphate type by means of a reaction between a phosphate rock substrate and orthophosphoric acid (V), characterized in that the phosphate rock substrate is a mixture of crushed, natural phosphate rock with a P2O5 content of at least 37% (m / m) and ash resulting from the mono-combustion of chicken manure with a P2O5 content of at least 23% (m / m), mixed in such proportions that the substitution of phosphorus compounds introduced into the reaction medium by the phosphate rock with phosphorus compounds introduced by ash from the mono-combustion of chicken manure is from 10% to 70% (m / m), which substrate is introduced into orthophosphoric acid (V), with a concentration of 28% to 32% in terms of P2O5, heated to a temperature not lower than 55°C, not higher than 65°C, in portions, with constant stirring, until all the substrate is introduced, the reaction being carried out with an excess ratio of acid to substrate of 1.1:1 to 1.2:1,in open reaction vessels, maintaining the temperature of the reaction medium in the range of 90°C to 100°C, stirring periodically, until the reaction product solidifies into a pulp.,