1973 Blackmore 3725029 Urea AS

This invention describes a process/product, fertilizer constituent of ammonium sulfate for dried fertilizer blending prepared by granulating the ammonium sulfate in a drum granulator using a concentrated lignosulofonate solution as a binder, coating the granulated particles of ammonium sulfate with molten urea to have the urea solidify upon the surface of the ammonium sulfate particles, and contacting the coated particles with a dry powder as an anti-caking agent.


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