Patent EA-003865-B1 (EA)
Title: Granulation method at production of granulated fertilizer, granulation method of fertilizer feedstock material (variants), and granulated fertilizer
Inventor: PHINNEY ROBIN
IPC: C05G5/12
Filed: 1999-04-08
Abstract: 1. A method for granulating at the production of fertilizer, comprising the steps of mixing of a compound containing urea in granulating drum with granules having interstitial space in a size distribution of 3 mesh to about 10 mesh at the temperature sufficient to keep said compound containing urea in a liquid state with introducing it in interstitial space inside of fertilizer compound granules, and the following cooling of mixture to form solid granules, characterized in that said fertilizer is selected from the group consisting of ammonium sulfate, potassium sulfate, potassium chloride, potassium nitrate, said mixture is subjected to aging in said granulating drum at the temperature of approximately 110 degree C, slightly exceeding the melting temperature of said mixture, containing urea, and the cooling is carried out till the temperature of approximately 65 degree C, and the compound containing urea being recrystallized inside of said spaces with the forming of mature of said compound. 2. A method for granulating a fertilizer feedstock, comprising the steps of mixing of a compound containing urea in granulating drum with granules of a source of ammonium sulfate granules having interstitial space in a size distribution of 3 mesh to about 10 mesh at the temperature sufficient to keep said compound containing urea in a liquid state, and the following cooling of mixture to form granules, characterized in that said mixture is subjected to aging in said granulating drum at the temperature of approximately 110 degree C, slightly exceeding the melting temperature of said mixture, containing urea, and the cooling is carried out till the temperature of approximately 65 degree C, with forming of ammonium sulfate granules, urea being introduced inside of it. 3. The method as defined in claim 2, wherein said ammonium sulfate source granules has a size distribution of about 5 mesh to about 10 mesh. 4. The method as defined in claim 2, wherein urea formaldehyde is used as a compound containing urea. 5. The method as defined in claim 2, wherein urea-ammonium orthophosphate is used as a compound containing urea. 6. The method as defined in claim 2, wherein urea-ammonium polyphosphate is used as a compound containing urea. 7. The method as defined in claim 2, wherein the product of reaction of urea and formaldehyde, containing more than 1urea molecular for 1 molecular of formaldehyde is used as a compound containing urea. 8. A granulated fertilizer, comprising a potassium granule containing about 20% empty interstitial volume; and compound, containing urea in said volume. 9. The fertilizer as defined in claim 8, wherein said granule has a size distribution of about 3 mesh to about 10 mesh. 10. The fertilizer as defined in claim 8, wherein urea formaldehyde is used as a compound containing urea. 11. The fertilizer as defined in claim 8, wherein urea-ammonium orthophosphate is used as a compound containing urea. 12. The fertilizer as defined in claim 8, wherein urea-ammonium polyphosphate is used as a compound containing urea. 13. The fertilizer as defined in claim 8, wherein the product of reaction of urea and formaldehyde, containing more than 1urea molecular for 1 molecular of formaldehyde is used as a compound containing urea. 14. The fertilizer as defined in claim 8, wherein said potassium granule is represented by potassium chloride. 15. The fertilizer as defined in claim 8, wherein said potassium granule is represented by potassium sulfate. 16. The fertilizer as defined in claim 8, wherein said potassium granule is represented by potassium nitrate. 17. A method for granulating a fertilizer feedstock, comprising the steps of mixing of a compound containing urea in granulating drum with granules of a source of ammonium sulfate granules having interstitial space in a size distribution of 3 mesh to about 10 mesh at the temperature sufficient to keep said compound containing urea in a liquid state, and the following cooling of mixture to form granules, characterized in that the compound, containing urea is mixed with source of potassium sulfate granules as a fertilizer compound, said mixture is subjected to aging in said granulating drum at the temperature of approximately 110 degree C, slightly exceeding the melting temperature of said mixture, containing urea, and the cooling is carried out till the temperature of approximately 65 degree C, with forming of potassium sulfate granules, urea being introduced inside of it. 18. The method as defined in claim 17, further including the step of introducing a surfactant into said granulating drum. 19. The method as defined in claim 17, wherein said mixture is cooled in a second mixing drum by countercurrent contact with cooling air. 20. The method as defined in claim 17, wherein said temperature in said granulating drum is at least the temperature at which said urea compound melts. 21. The method as defined in claim 17, wherein said mixture is cooled sufficiently to solidify said urea compound in said potassium sulfate. 22. The method as defined in claim 17, wherein said granules have a size distribution of about 4 mesh to about 10 mesh. 23. A method for granulating a fertilizer feedstock, comprising the steps of mixing of a compound containing urea in granulating drum with granules of a source of ammonium sulfate granules having interstitial space in a size distribution of 3 mesh to about 10 mesh at the temperature sufficient to keep said compound containing urea in a liquid state, and the following cooling of mixture to form granules, characterized in that the compound, containing urea is mixed with source of potassium chloride granules as a fertilizer compound, said mixture is subjected to aging in said granulating drum at the temperature of approximately 110 degree C, slightly exceeding the melting temperature of said mixture, containing urea, and the cooling is carried out till the temperature of approximately 65 degree C, with forming of potassium chloride granules, urea being introduced inside of it. 24. The method as defined in claim 23, further including the step of introducing a surfactant into said mixing drum. 25. The method as defined in claim 23, wherein said mixture is cooled in a second mixing drum by countercurrent contact with cooling air. 26. The method as defined in claim 23, wherein said temperature in said mixing drum is at least the temperature at which said urea compound melts. 27. The method as defined in claim 23, wherein said mixture is cooled sufficiently to solidify said urea compound in said potassium chloride. 28. The method as defined in claim 23, wherein said granules have a size distribution of about 5 mesh to about 10 mesh. 29. A method for granulating a fertilizer feedstock, comprising the steps of: providing a compound containing urea; providing a source of preformed potassium nitrate granules having interstitial space in a size distribution of 3 mesh to about 10 mesh; introducing said compound containing urea and said potassium nitrate granules into a mixing drum; maintaining a temperature in said mixing drum sufficient to keep said compound containing urea in a liquid state for mixture with said potassium nitrate; and crystallizing said compound containing urea in said interstitial space by cooling said mixture to form urea bearing potassium nitrate granules.