SSP, TSP & USP Superphosphate Fertilizer Process

Casale’s superphosphate fertilizer process is suitable to produce any kind of superphosphate in powder form, namely Single SuperPhosphate (SSP), Triple SuperPhosphate (TSP) and Urea SuperPhosphate (USP) in capacities ranging from 25 to 50 MTPH per train, depending on the grade and quality of the phosphate rock.

The superphosphates can be used directly as a fertilizer, either in ‘run-of-pile’ (ROP, i.e. powder) form as obtainedd by the process or after granulation, or they can be used as a phosphatic source material in a conventional granular complex fertilizer process (NPK).

Key features

• When used to produce SSP and USP, the process is a low-cost replacement of costlier phosphoric acidproduction as a means of obtaining a soluble phosphate fertilizer from phosphate rock
• When used to produce TSP, the process requires phosphoric acid, but one third of the total P2O5 may come from low cost phosphate rock
• It is widely believed that Urea and superphosphate cannot be directly mixed to obtain urea superphosphate but USP process makes it easily and reliably possible
• A conventional fertilizer granulation unit can be added to:
  • convert the Run-of-Pile superphosphates (SSP, TSP, USP) into granular form
  • produce various grades of NP or NPK fertilizer using the ROP superphosphate (SSP, TSP, USP) as the phosphate source. Additionally, the Casale Dual Pipe Reactor technology, with pipe reactor in the granulator and eventually also in the dryer, can be employed to reduce fuel consumption if sulphuric or phosphoric acid is available
• Efficient scrubbing system with zero liquid effluent
• Proven design with a wide range of phosphate rocks