Flow sheet of fertilizer granulation plants utilizing roller presses for compaction

4 Flow sheet of fertilizer granulation plants utilizing roller presses for compaction 

Premixed formulation (1) is fed into a surge (day) bin (2). Recycled material (fines, 17) and dust from the dust-collection system (20) are transported to the bin (18). The latter should be sized such that, in the case of an emergency or unscheduled switchover, the entire hold-up of the plant can be accepted. If a new formulation must be run, the contents of the recycle bin (18) can be dumped via the diverter gate (19). 

The compacted flakes exiting from the roller press (8) are precrushed by the flake breaker (9) and screened (10) to remove fines. Coarse material is 

Potential modifications to this basic flow sheet are  

Elimination of the flake breaker (9). Sometimes the flake or sheet produced in the compactor (8) breaks up easily when the compacted material falls onto a (belt) conveyor or screen and a flake breaker is not required. 

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