Humic acid and urea-formaldehyde sustained-release chelated fertilizer, and preparation method and application thereof
A humic acid urea-formaldehyde and humic acid technology, applied in the field of agricultural fertilizers, can solve problems such as inapplicability and harsh conditions, and achieve the effects of improving compressive strength, anti-pulverization ability, good viscosity and increasing crop yield.
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Embodiment 1
[0040] Present embodiment provides a kind of humic acid urea-formaldehyde slow-release fertilizer, and its formula is as follows:
[0041] Humic acid urea formaldehyde slurry 500kg, urea 2120kg, ammonium chloride 200kg, monoammonium phosphate 3409kg, potassium chloride 2483kg, superfine weathered coal 600kg, calcium magnesium phosphate fertilizer 200kg, attapulgite powder 488kg.
[0042] Wherein the preparation method of humic acid urea formaldehyde slurry is as follows:
[0043] Taking 1000 kg of feeding each time as an example, add 900 kg of water to the reactor, add 18 kg of potassium hydroxide under continuous stirring, raise the temperature to 70-80°C, and then add 100 kg of lignite (pre-crushed 80-100 mesh), keep The temperature is 80°C, the reaction time is 2.5 hours, the obtained slurry is left to stand for 24 hours, and the supernatant is taken, which is the humic acid-base extract;
[0044]Taking each production of 1000 kg as an example, add 320 kg of 37% formaldehy...
Embodiment 2
[0046] This embodiment provides a kind of humic acid urea-formaldehyde slow-release fertilizer and preparation method thereof:
[0047] Specific steps are as follows:
[0048] 1) Preparation of humic acid-alkaline extract: taking 1000 kg of feeding each time as an example, add 900 kg of water into the reaction kettle, add 18 kg of potassium hydroxide under continuous stirring, raise the temperature to 70-80 °C, and then add lignite (pre-crushed 80-100 mesh) 100 kg, keep the temperature at 80° C., and the reaction time is 2.5 hours. The obtained slurry is left to stand for 24 hours, and the supernatant is taken, which is the humic acid-base extract.
[0049] 2) Preparation of humic acid urea-formaldehyde slurry: taking 1000 kg per production as an example, add 320 kg of 37% formaldehyde (industrial grade) to the reaction kettle, add 240 kg of the first batch of urea under continuous stirring, and heat up to 50°C. React for 20-30 minutes, add the second batch of urea 240 kg, th...
Embodiment 3
[0054] Present embodiment provides a kind of humic acid urea-formaldehyde slow-release fertilizer, and its formula is as follows:
[0055] Humic acid urea formaldehyde slurry 400kg, urea 5043kg, monoammonium phosphate 1818kg, potassium chloride 1987kg, superfine weathered coal 400kg, calcium magnesium phosphate fertilizer 150kg, attapulgite powder 202kg.
[0056] Wherein, the preparation method of described humic acid urea formaldehyde slurry is as follows:
[0057] Taking 1000 kg of feeding each time as an example, add 900 kg of water to the reactor, add 18 kg of potassium hydroxide under continuous stirring, raise the temperature to 70-80°C, and then add 100 kg of lignite (pre-crushed 80-100 mesh), keep The temperature is 80°C, the reaction time is 2.5 hours, the obtained slurry is left standing for 24 hours, and the supernatant is taken, which is the humic acid-base extract.
[0058] Taking each production of 1000 kg as an example, add 343 kg of 37% formaldehyde (industria...
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