Method and an installation for producing granulated triple superphosphate (TSP)

An installation for producing granulated triple superphosphate, comprising:

• measuring-out equipment for measuring out previously ground phosphate;
• premixing means for intermixing the measured out ground phosphate with a solution of phosphoric acid to ensure premixing of the phosphate within said premixing means without clogging, said premixing means comprising a vertically oriented cylindrical member and a tapered portion extending from said cylindrical member with said cylindrical member having an opening at the top end thereof for receiving said measured out phosphate;
• flexible and resilient axial hollow sleeve means for guiding said ground phosphate into the opening of said premixing means, said hollow sleeve means extending into said cylindrical member and having an upper end connected to said cylindrical member in common with the opening at said premixing means at the top end thereof and having an unconnected free lower end and an opening therein and
• at least one phosphoric acid solution sprayer positioned for injecting said solution of phosphoric acid under pressure into said flexible sleeve means through said opening in said sleeve means at an angle relative to the direction of the phosphate so as to cause the unconnected free lower end thereof to randomly move about said premixing means;
• a mixing reactor tank located downstream of said premixing means for receiving the premixed phosphate and phosphoric acid solution from said premixing means to allow the phosphoric acid solution in the tank to attack the granulated phosphate to form a slurry;
• a granulating drum for granulating the slurry leaving the mixing reactor tank;
• a drying device for drying the granulated product;
• a plurality of separators for separating said granulated product by grain size;
• scrubbing devices for scrubbing the reaction gases, the drying gases, and the waste gases generated from the premixing means and reactor tank;
• and
• a recycling circuit for recycling to the granulating drum rejected finished product after grain size separation.