A kind of preparation method of mustard nutrient fertilizer
A preparation method and nutrient fertilizer technology, applied in chemical instruments and methods, fertilization devices, fertilizer mixtures, etc., can solve the problems of large introduction of calcium dihydrogen phosphate products, environmental pollution, low absorption rate, etc., and achieve significant environmental protection value, Significant economic value, low phosphorus recovery effect
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Embodiment 1
[0041] A preparation method of mustard nutrient fertilizer. Phosphoric acid and carbonamide are added to the reactor at a molar ratio of 1.1:1 and mixed, then the temperature of the two mixtures is raised to 120°C at a heating rate of 4°C / min, and the reaction is stirred After 160 minutes, the temperature was cooled to 20°C and then centrifuged to obtain the intermediate; the intermediate and calcium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:0.6, and the stirring speed was 180r / min to stir the reaction for 60 minutes, and Regulate the pH value of reaction to be 8.5, after reaction finishes, obtain the slurry containing nitrogen phosphorus calcium, this slurry is placed in cooling crystallizer circulation crystallization process, detects and analyzes filtrate simultaneously, when nitrogen content is 9%, 5% in the filtrate When the phosphorus oxide content is 4.5%, stop crystallization and filter, and the filter cake that obtains is calcium dihydrogen ...
Embodiment 2
[0043] A preparation method of mustard nutrient fertilizer. Phosphoric acid and carbonamide are added to the reaction kettle at a molar ratio of 1.3:1 and mixed, and then the temperature of the two mixtures is raised to 150°C at a heating rate of 6°C / min, and the reaction is stirred After 180 minutes, the temperature was cooled to 45°C and then centrifuged to obtain the intermediate; the intermediate and calcium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:0.8, and the reaction was stirred at a stirring speed of 250r / min for 40 minutes, and Regulate the pH value of reaction to be 9.5, after reaction finishes, obtain the slurry containing nitrogen phosphorus calcium, this slurry is placed in cooling crystallizer circulation crystallization process, detects and analyzes filtrate simultaneously, when nitrogen content is 12%, 5% in the filtrate When the phosphorus oxide content is 6%, stop crystallization and filter, and the filter cake that obtains is calc...
Embodiment 3
[0045] A preparation method of mustard nutrient fertilizer. Phosphoric acid and carbonamide are added to the reactor at a molar ratio of 1.2:1 and mixed, and then the temperature of the two mixtures is raised to 135°C at a heating rate of 6°C / min, and the reaction is stirred 170min, the temperature was cooled to 30°C and then centrifuged to obtain the intermediate; the intermediate and calcium hydroxide were mixed and reacted in the reactor at a molar ratio of 1:0.7, and the stirring speed was 230r / min for 50min, and Regulate the pH value of reaction to be 9, after reaction finishes, obtain the slurry containing nitrogen phosphorus calcium, this slurry is placed in cooling crystallizer circulation crystallization process, detects and analyzes filtrate simultaneously, when nitrogen content is 10%, 5% in the filtrate When the content of diphosphorus oxide is 5%, stop the crystallization and filter, and the obtained filter cake is a calcium dihydrogen phosphate product; add potass...
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