Process for making granules containing urea as the main...

Details Process for making granules containing urea as the main... Process for making granules containing urea as the main...

C - Chemistry, Metallurgy

05

C

71/23, 71/44

C05C 9/00 (2006.01) B01J 2/16 (2006.01) B01J 2/30 (2006.01) F24D 17/00 (2006.01)

Patent

CA 1190059

A B S T R A C T A process for making granules containing urea as the main component by spraying an aqueous urea solution having a urea concentration of 85-98 % by weight, to which solution magnesium hydroxide, an inorganic magnesium salt or a mixture of such substances has been added as a crystallization retarder for the urea, and which solution optionally contains one or more other fertilizers in solution and/or suspension, is sprayed in the form of very fine droplets having an average diameter of between 20 and 120 micron into a fluidized bed of urea particles at a temperature at which the water on the solutions sprayed onto the particles is evaporated, and urea or urea containing material solidifies on the particles, to form granules having a desired size. The urea granules thus produced are compatible with single and triple superphosphate granules.

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