A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate
A technology for by-producing potassium dihydrogen phosphate and potassium dihydrogen phosphate, which is used in ammonium orthophosphate fertilizers, chemical instruments and methods, alkaline orthophosphate fertilizers, etc. Waste of potassium hydrogen phosphate, low purity of potassium dihydrogen phosphate products, etc., achieve significant environmental protection value and economic benefits, reduce production costs, and make up for the effects of impurity removal costs
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Embodiment 1
[0042] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.1:1 and mixed, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min To 100℃, the reaction was stirred for 120min, then the temperature was cooled to 30℃ at a rate of 3℃ / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and alkaline potassium salt were added to the urea phosphate at a molar ratio of 1:1.1 Mix the reaction in the reaction kettle, adjust the pH of the reaction to 8.5, and stir the reaction for 60 minutes at a stirring speed of 200r / min. After the reaction is completed, a slurry containing nitrogen, phosphorus and potassium is obtained, which is placed in a cooling crystallizer for cyclic crystallization Processing, while detecting and analyzing the filtrate, when the molar ratio of nitrogen, phosphorus, and ...
Embodiment 2
[0045] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.3:1 and mixed, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min To 120℃, the reaction was stirred for 100min, then the temperature was cooled to 45℃ at a rate of 3℃ / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and alkaline potassium salt were added to the urea phosphate at a molar ratio of 1:1.3 Mix the reaction in the reactor, adjust the pH of the reaction to 9.5, stir at 250r / min and stir the reaction for 40 minutes. After the reaction, obtain a slurry containing nitrogen, phosphorus and potassium, and place the slurry in a cooling crystallizer for cyclic crystallization treatment , Detect and analyze the filtrate at the same time. When the molar ratio of nitrogen, phosphorus and potassium in the filtrate is 4....
Embodiment 3
[0048] A method for preparing special fertilizer for pears and by-product potassium dihydrogen phosphate. Phosphoric acid and carbamide are added to the reactor at a molar ratio of 1.2:1 to mix, and then the temperature of the two mixtures is increased at a temperature rise rate of 5°C / min When the temperature reaches 110°C, the reaction is stirred for 110 minutes, then the temperature is cooled to 40°C at a speed of 3°C / min, and then centrifuged to obtain the urea phosphate intermediate; the intermediate and the alkaline potassium salt are added to the urea phosphate at a molar ratio of 1:2 Mix the reaction in the reactor, adjust the pH of the reaction to 9, the stirring speed is 220r / min and stir the reaction for 50 minutes. After the reaction is over, a slurry containing nitrogen, phosphorus and potassium is obtained, which is placed in a cooling crystallizer for cyclic crystallization. Simultaneously detect and analyze the filtrate. When the molar ratio of nitrogen, phosphor...
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