Humic acid long-acting compound fertilizer and its preparing method
A humic acid and compound fertilizer technology, applied in urea compound fertilizer, nitrogen fertilizer, organic fertilizer, etc., can solve the problems of loss of slow release performance, humic acid coating layer does not have waterproof performance, waste of formaldehyde, etc., to reduce the broken rate , reduce the fixed ratio, increase the effect of fertilizer efficiency
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[0027] Example 1
[0028] The humic acid long-acting compound fertilizer of the present invention is composed of 25-40 parts of humic acid urea-formaldehyde complex and 7560 parts of soluble nitrogen, phosphorus and potassium fertilizers in weight ratio, wherein: the weight ratio between soluble nitrogen, phosphorus and potassium fertilizers It is 12-25:30-40:10-20; the raw materials of the humic acid urea-formaldehyde complex are 15-30 parts peat powder, 31-46 parts urea, and 1-2 parts ammonium chloride. And 36 to 42 parts of formaldehyde with a concentration of 30%.
[0029] The preparation of its humic acid nitrogen fertilizer complex:
[0030] Using peat powder, urea, ammonium chloride and formaldehyde as raw materials, firstly condense urea and formaldehyde (molecular ratio 1:2.0~2.5) in an alkaline solution (pH 7~8) at 50~95℃ for 5~ 30 minutes;
[0031] Then add ammonium chloride to adjust the pH of the solution to 4~5; continue to add urea to this solution to make the molar...
Example Embodiment
[0042] Example 2
[0043] The preparation process of the humic acid urea-formaldehyde complex is the same as in Example 1, except that first, 12 kg of urea and 42 kg of 30% industrial formaldehyde (molecular ratio 1:2.1) are mixed, and then saturated NaOH solution is used. Adjust the pH of the mixed solution to 7.5 and condense for 20 minutes at a temperature of 60-70°C; then add 2 kg of ammonium chloride to adjust the pH of the solution to 4-5; continue to add 24 kg of urea to this solution, At this time, the molar molecular ratio of urea and formaldehyde is 1.4:1. Keep the temperature of the solution at 65-75°C, and continue to condense urea and formaldehyde for 0.2 hours; then slowly add 20 kg of 60 mesh peat powder and keep stirring to keep the temperature of the mixture at For 1.5 hours at 70-80°C, the product is air-dried, dried, pulverized and passed through an 80-mesh sieve to obtain a gray-black powder humic acid urea-formaldehyde complex.
[0044] Mix 33.5 kilograms of h...
Example Embodiment
[0045] Example 3
[0046] The preparation process of the humic acid urea-formaldehyde complex is the same as in Example 1, except that first 9 kg of urea and 36 kg of 30% industrial formaldehyde (molecular ratio 1:2.4) are mixed, and then a saturated NaOH solution is used to mix Adjust the pH of the mixed solution to 7.8, and condense for 10 minutes at a temperature of 80-90°C; then add 1 kg of ammonium chloride to adjust the pH of the solution to 4 to 5; continue to add 24 kg of urea to this solution. When the molar molecular ratio of urea and formaldehyde is 1.5:1, keep the temperature of the solution at 70~80℃, and continue to condense urea and formaldehyde for 0.5 hours; then slowly add 30 kg of 60 mesh peat powder and keep stirring to keep the temperature of the mixture at 80 At ~90°C for 0.5 hours, the product is air-dried, dried, pulverized and passed through an 80-mesh sieve to obtain a gray-black powder humic acid urea-formaldehyde complex.
[0047] Mix 40 kilograms of th...
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