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This publication approaches a typical Odda Process for NPK Fertilizer production using rock phosphate, ammonia, nitric acid and carbon dioxide. Initially, rock phosphate is digested with nitric acid. Calcium nitrate is removed by crystallization from the NP solution, which is neutralized by addition of gaseous ammonia. To produce NPK potassium chloride or sulfate is finally admixed. The product formulation is 16-16-16 (16% N, 16% P2O5, 16% K2O). The economic analysis is based on a plant located in the United States.
This report presents the economics of a typical phosphonitric process for NPK Fertilizer production in the United States from rock phosphate, phosphoric acid, ammonia, and nitric acid. Initially, rock phosphate is digested with nitric acid and phosphoric acid. The NP solution generated is then neutralized with gaseous ammonia. To produce NPK potassium chloride or sulfate is finally admixed. The product formulation is 15-15-15 (15% N, 15% P2O5, 15% K2O).