Caking problem on the inner wall of the diammonium phosphate granulator
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Our workshop has been producing 64 diammonium compound for several years now. A major overhaul was carried out before the New Year, but nothing was changed. However, after just two days of operation, severe scarring formed along the interior walls of the granulation kiln; those areas ended up looking like buckets, creating small compartments inside the kiln. We had never encountered this issue before. Both the operating procedures and the equipment modifications were restored to their original state, yet the scarring still occurred. The scaly deposits were in a powdered form, meaning no granulation took place. We spent a long time trying to figure out the cause – could it be related to acid? Seeking experts' experience
Let’s first take a look at the changes in raw material impurities
Acid is related to it; there’s a problem with the reactor, and N/P is also relevant