Urea-formaldehyde fertilizer and urea-formaldehyde complex fertilizer and preparation method thereof
A technology of urea-formaldehyde fertilizer and formaldehyde, which is applied in urea compound fertilizer, nitrogen fertilizer, fertilization device and other directions, can solve the problem of few research reports on degradation system, and achieve the effect of increasing fertilizer utilization rate, improving utilization rate and reducing fertilizer consumption.
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Embodiment 1
[0046] Embodiment 1, preparation and detection of fertilizer
[0047] 1. Preparation
[0048] 1. Add 400g corn flour and 4kg water into a beaker (mass ratio of corn flour to water is 1:10), heat to boiling, keep warm for 15min, gelatinize to form starch paste, transfer all starch paste into the reaction kettle.
[0049] 2. Then add 18kg urea and 10 liters of 37% formaldehyde to the reactor, the molar ratio of urea to formaldehyde is 2.45:1, and the mass ratio of urea to corn flour is 45:1; quickly adjust the reactor with 10% NaOH solution The pH value of the reaction system reached 11, then the temperature was raised to 70° C., and the temperature was maintained for 60 minutes to obtain solution I.
[0050] 3. Put 6kg of non-metallic mineral powder adsorbent (the mass ratio of non-metallic mineral powder adsorbent to urea is 1:3) into another empty container, then add solution I into the container, and add the concentration of 20% at the same time H 2 SO 4 Solution, stir w...
Embodiment 2
[0075] Embodiment 2, preparation and detection of fertilizer
[0076] 1. Preparation
[0077]1. Add 500g of sweet potato flour and 2.5kg of water into a beaker (mass ratio of sweet potato flour to water is 1:5), heat to boiling, keep warm for 15min, gelatinize to form starch paste, transfer all the starch paste into the reaction kettle.
[0078] 2. Add 15kg of urea and 10 liters of 37% formaldehyde to the reactor, the molar ratio of urea to formaldehyde is 2:1, and the mass ratio of urea to sweet potato flour is 30:1; quickly adjust the reactor with 10% NaOH solution The pH value of the reaction system was raised to 10.5, then the temperature was raised to 65° C., and the temperature was kept for 30 minutes to obtain solution I.
[0079] 3. Put 7.5kg of non-metallic mineral powder adsorbent (the mass ratio of non-metallic mineral powder adsorbent to urea is 1:2) into another empty container, then add solution I into the container, and add the concentration of 20 %H 2 SO 4 ...
Embodiment 3
[0091] Embodiment 3, preparation and detection of fertilizer
[0092] 1. Preparation
[0093] 1. Add 200g of wheat flour and 4kg of water into a beaker (mass ratio of wheat flour to water is 1:20), heat to boiling, keep warm for 15min, gelatinize to form starch paste, transfer all the starch paste into the reaction kettle.
[0094] 2. Add 9 kg of urea and 3 liters of 37% formaldehyde to the reactor, the molar ratio of urea to formaldehyde is 4:1, and the mass ratio of urea to wheat flour is 45:1; quickly use 10% NaOH solution to adjust the reaction in the reactor The pH value of the system reached 13, then the temperature was raised to 80° C., and the temperature was kept for 120 minutes to obtain solution I.
[0095] 3. Put 0.9kg of non-metallic mineral powder adsorbent (the mass ratio of non-metallic mineral powder adsorbent to urea is 1:10) into another empty container, then add solution I into the beaker, and add the concentration of 20% H 2 SO 4 Solution, stir while a...
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