Ultrahigh-concentration phosphorus potassium fertilizer and preparation method
A fertilizer and concentration technology, applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problems of inability to supplement medium elements, increase in fertilizer cost, low absorption and utilization rate of foliar fertilizer, etc. Reduced dosage, not easy to run off, obvious effect
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experiment example 1
[0027] Add 704 kg of 85% industrial phosphoric acid to the pilot test reactor, and then add 500 kg of water to dilute, slowly add 607 kg of potassium hydroxide with a content of 90% for chemical reaction, and at the same time, in the process of adding potassium hydroxide Add 2 kg of EDTA·2NaZn (Suzhou Liansheng Chemical Industry Co., Ltd.) stabilizer, heat, and when the reaction temperature reaches 120 ° C, slowly add the catalyst potassium formate, polyacrylamide, urea, and potassium citrate to the pilot test In the reactor, the molar ratio of the catalyst potassium formate, polyacrylamide, urea, and potassium citrate is 1:2.5:0.1:0.21, the amount of the catalyst is 0.006% of the total mass of the aforementioned raw materials, and the stirring speed is maintained at 120r / min. When the temperature of the system reaches 130-140°C, open the reflux cooling device, keep stirring at this temperature (and stirring speed) for 90-100 minutes, and then transfer the material to a high-sp...
experiment example 2
[0029] Add 7 tons of 85% industrial phosphoric acid to the reaction kettle, and then add 5 tons of water to dilute, slowly add 6 tons of potassium hydroxide with a content of 90% for chemical reaction, and add 20 kg during the process of adding potassium hydroxide EDTA·2NaZn stabilizer, heating, when the reaction temperature reaches 120°C, add the catalyst potassium formate, polyacrylamide, urea, and potassium citrate into the pilot test reactor, in which the catalyst potassium formate, polyacrylamide, urea , The molar ratio of potassium citrate is 1: 1.5: 0.2: 0.01, and the amount of catalyst is 0.008% of the total mass. Stir evenly and keep the stirring speed at 90r / min. When the temperature of the system reaches 130-140°C, open the reflux cooling device, keep stirring at this temperature for 100-110 minutes, and then transfer the material to a high-speed centrifugal spray dryer for spray drying to obtain a powder product. Product: P 2 o 5 : 43.2%, K 2 O: 39.3%, Zn: 0.2%...
experiment example 3
[0031] Add 704 kg of 85% industrial phosphoric acid to the pilot test reactor, and then add 500 kg of water to dilute, slowly add 607 kg of potassium hydroxide with a content of 90% for chemical reaction, and at the same time, in the process of adding potassium hydroxide Add 2 kg of EDTA2NaZn stabilizer and heat it. When the reaction temperature reaches 120°C, add the catalyst potassium formate, polyacrylamide, urea, and potassium citrate into the pilot test reactor. Among them, the catalyst potassium formate, polyacrylamide, The molar ratio of urea and potassium citrate is 1:0.5:0.1:0.01, and the amount of catalyst is 0.001% of the total mass. Stir evenly and keep the stirring speed at 70r / min. When the temperature of the reaction system reaches 130-150°C, open the reflux cooling device, keep stirring and reacting at this temperature for 80-100 minutes, and then transfer the material to a high-speed centrifugal spray dryer for spray drying to obtain a powder product. This pr...
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