Unique Requirements for Manufacturing Urea-Based Granular Compound Fertilizers

7 Unique Requirements for Manufacturing Urea-Based Granular Compound Fertilizers 

The wide availability of urea at competitive prices makes it an attractive source of nitrogen for the producer of compound fertilizers. If the particle (granule) size of urea is compatible with other fertilizer materials 

Furthermore, the storage properties of urea-containing compound fertilizers are often inferior to those of compounds that do not contain urea. The tendency to ab- 

Prilled urea is preferred because its small particle size helps to fecilitate its relatively homogeneous incorporc on 

If the urea content of the formula is more than about 20%, it iS preferable to dissolve a portion of the urea to produce a hot (105°C) 75%-80% urea solution. The availability of urea solution adds considerable flexibility to the process. The solution is sprayed on top of the bed of material in the granulator. In most instances, a solution of urea is preferred over an almost anhydrous urea melt because it is easier to handle and a solution more effectively promotes agglomeration of the other solid materials used in the formulation. 

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