A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer
A technology of potassium dihydrogen phosphate and by-product green onions, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve the problems of stagnation, soil compaction, and low purity of potassium dihydrogen phosphate, and achieve good absorption rate and reduce planting. Cost and effect of improving the quality of green onions
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Embodiment 1
[0062] A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer provided by this embodiment mainly comprises the following steps:
[0063] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.5:1, heat up from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.1, and the pH value is adjusted to 8.5-9.0. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in cooling Cool the crystallizer to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment. The obtained filter cake is potassium dihydrogen phosphate product, and the component content in the filtrate i...
Embodiment 2
[0068] A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer provided by this embodiment mainly comprises the following steps:
[0069] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.2:1, heat up from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.4, and the pH value is adjusted to 8.5-9.0. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in cooling Cool the crystallizer to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment. The obtained filter cake is potassium dihydrogen phosphate product, and the component content in the filtrate i...
Embodiment 3
[0074] A kind of production method of preparing potassium dihydrogen phosphate by-product green onion special fertilizer provided by this embodiment mainly comprises the following steps:
[0075] 1) Mix phosphoric acid and carbonamide at a molar ratio of 1.4:1, heat up from 80°C to 160°C at a heating rate of 6°C / min, stir and react for 4-5 hours, and separate the intermediate; then use the intermediate and The basic potassium salt is mixed according to the molar ratio of 1:1.3, and the pH value is adjusted to 8.5-9.0. After the reaction is completed, a slurry containing nitrogen, phosphorus, and potassium is obtained, and the slurry containing nitrogen, phosphorus, and potassium is placed in cooling Cool the crystallizer to 35-40°C, carry out crystallization and filtration treatment, and circulate the filtrate in the cooling crystallizer for crystallization treatment. The obtained filter cake is potassium dihydrogen phosphate product, and the component content in the filtrate i...
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