Patent ID: 6293985
Filing Date: 2001-09-25
Classification: B01J,C05C,C05G

Abstract:
A method of forming a composite fertilizer, comprising the steps of:providing a compound containing urea;providing a source of pre-formed ammonium sulfate granules having interstitial space and in a size distribution of 3 mesh to about 10 mesh, said granules devoid of any compound containing urea;introducing said compound containing urea and said granules of ammonium sulfate into a mixing drum;maintaining said granules of ammonium sulfate in a solid state in the form of discrete granules to provide individual solid ammonium sulfate matrices into which said compound containing urea may flow;maintaining said compound containing urea in a liquid state;impregnating liquid urea into said interstitial space of said granules of ammonium sulfate;cooling granules having urea impregnated therein with a cooling gas without accretion of said urea about said granules;crystallizing said compound containing urea within said interstitial space in said mixing drum; andforming a composite fertilizer having discrete ammonium sulfate granules containing urea within said interstitial space of each of said granules of ammonium sulfate while retaining a size distribution of 3 mesh to about 10 mesh for said granules.