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Granulating Aid
 
PREFACE
Urea based NP or NPK type of fertilizers have very low granule strength. There is also generation of fines during the manufacture and handling/transportation of these fertilizers. We at Fertibon Products have developed a Granulating Aid to improve the granulation, reduction of dust or fines formation and improvement of granule strength of NP or NPK type of fertilizers.
 
THE PROCESS
NP type of fertilizer is manufactured basically by physical blending of Urea and Ammonium phosphate slurry obtained by mixing phosphoric Acid with Ammonia in presence of Sulfuric Acid in a conventional Pre-neutralizer or a Pipe Reactor. Urea and the slurry are blended in the granulator to obtain the final product NP.
 
THE PROBLEMS
Since Urea is being coated by the slurry of Ammonia Phosphate, the granules formed have low crushing strength because of the physical bonding of Ammonium phosphate slurry with Urea granule is very weak and the ultimate crushing strength is very low. This results in powdering of the product during handling and transportation or in the granualtor itself during production stage resulting in generation of a very high percentage of fines or under sized granules.
 
THE SOLUTION

GRANULATING AID is available in a free flowing liquid formulation pumpable at ambient temperature and it should be dosed directly into the PN at a dosage of 0.1 to 0.15% by weight of final rate of production. It helps to increase the bonding of the Ammonium phosphate with Urea granules but also helps in increasing the crushing strength of the final product. It also arrests the fines production and practically eliminates dusting in total.

Please note that though Granulating Aid gives improvement in crushing strength and reduction of fines in the fertilizer it also depends on other factors such as initial crushing strength of Urea, process conditions especially the ratio of AN slurry and Urea input to the granulator & recycle ratio
Granulating Aid does not in any way interfere with the chemical properties and the end use of fertilizer. Granulating Aid is non-toxic and easily bio-degradable.

 
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