TH57802B - A method for the production of high nitrogen content nitrophosphate products. - Google Patents

Abstract

DC60 is a method for producing nitrogen, phosphorus, or nitrogen-phosphorus-potassium fertilizers with a nitrogen content of more than 25% by weight and less than 70% by weight ammonium nitrate. A molten liquid containing ammonium nitrate, ammonium phosphate, and possibly dicalcium phosphate and other components is mixed with solid ammonium sulfate into a nearly anhydrous nitrogen-phosphorus solution, with or without potassium salts. The molten liquid is then particleized, usually using the pril method. The resulting product is free-flowing. Non-oxidizing and non-explosive method for producing nitrogen, phosphorus, or nitrogen-phosphorus-potassium fertilizers, specifically those with a nitrogen content greater than 25% by weight and less than 70% by weight ammonium nitrate, from a molten liquid containing ammonium nitrate, ammonium phosphate, and possibly dicalcium phosphate and other components. Solid ammonium sulfate is mixed into a nearly anhydrous nitrogen-phosphorus solution, with or without potassium salts. The molten liquid is then particleized, usually using the pril method. The resulting product is free-flowing, non-oxidizing, and non-explosive.

Claims (1)

Revised 21/02/2017 1. Method for producing high N NP fertilizers or high N NPK fertilizers that are non-oxidizing and have a N content greater than 25% by weight, consisting of forming a molten liquid/slurry containing ammonium nitrate and monoammonium phosphate and less than 2% by weight of water. This method is characterized by the following: Prior to slight particleization of the molten liquid, in the case of producing high N NP fertilizers, solid ammonium sulfate and 0.1 to 10% by weight of water-binding agent are added to obtain an overall molten liquid composition such that N is greater than 25% by weight and ammonium nitrate is less than 70% by weight; or, in the case of producing high N NPK fertilizers, solid ammonium sulfate, 0.1 to 10% by weight of water-binding agent and at least one solid potassium salt are added to obtain... 1. The overall composition of the molten liquid is such that N is greater than 25% by weight and ammonium nitrate is less than 70% by weight, and the molten liquid is then atomized to form solid particles. 2. The method according to claim 1 with the following characteristics: - The water content in the molten liquid before the addition of ammonium sulfate or ammonium sulfate and potassium salt is less than 1% by weight, and - The ammonium sulfate solid has a particle size d50 in the range of 0.10 to 0.90 mm. 3. The method according to claim 1 or 2 with the following characteristics: The molten liquid/slurry also contains small amounts of diammonium phosphate, dicalcium phosphate, and other substances before the addition of ammonium sulfate or ammonium sulfate and at least one potassium salt. 4. The method according to claim 1 or 2 with the following characteristics: - The molten liquid has a nitrogen/P2O5 ratio greater than 0.9 and - The calcium to phosphorus ratio is less than 1, preferably 0.3 to 0.7. 5. The method according to claim 1 or 2 with the following characteristics: Potassium salts include KCl, K2SO4, or mixtures of these substances. 6. The method according to claim 1 or 2 with the following characteristics: Ammonium sulfate particles have a d50 size in the range of 0.40 to 0.60 mm. 7. The method according to claim 1 with the following characteristics: The water-binding agent is MgO and/or CaO with small particle sizes of 0.2% to 1% by weight. 8. Method according to claim 7 with the following characteristics: The average particle size of MgO particles is 0.2 to 3.0 millimeters. 9. Method according to claim 1 or 2 with the following characteristics: The total salt content mixed in the molten liquid is less than 52% by weight, the desired amount is less than 45% by weight. 10. One of the methods according to the claims mentioned above with the following characteristics: The molten liquid is particleized by prill. 11. Granular particles of nitrogen, phosphorus, or nitrogen-phosphorus-potassium fertilizers with high nitrogen content, incorporating ammonium sulfate, are particleized by prill and are freely flowing. Having the following characteristics: - Nitrogen content between 25% and 29% by weight, with NO3-N content less than 12.2% by weight, especially less than 11.4% by weight; - Potassium that is more than 45% by weight in water and more than 95% by weight in citric acid; and - Total ammonium sulfate content less than 30% by weight, with the desired amount being less than 22% by weight; and - The amount of water-binding agent from 0.1 to 10% by weight. 12. High N NP fertilizers or high N non-oxidizing NPK fertilizers with more than 25% N by weight, which include additional components: In the case of high N NP fertilizers: solid ammonium sulfate and 0.1 to 10% by weight of water-binding agent. And in the case of high N NPK fertilizers: solid ammonium sulfate, from 0.1 to 10% by weight of the aqueous binder, and at least one solid potassium salt, prepared by one of the methods in Reputation 1 to 10. 13. High N NP fertilizers or high N NPK fertilizers that are non-oxidizing according to Reputation 12, where the aqueous binder is 0.2 - 1% by weight of small particle MgO and/or CaO. 1. Method for producing nitrogen, phosphorus, or nitrogen-phosphorus-potassium fertilizers with a high nitrogen content that is non-oxidizing and contains more than 25% nitrogen by weight, where: - A molten liquid/slurry is formed.