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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

Inactive Publication Date: 2004-04-28
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this invention are: firstly, urea may generate biuret at a high temperature of 130°C; secondly, the added formaldehyde cannot sufficiently undergo condensation reaction with humic acid urea, and a large part of it will be React with other active groups in humic acid, thus causing waste of formaldehyde
Obviously, this encapsulated humic acid urea has only extremely limited slow-release performance, and the humic acid coating layer formed by this method does not have waterproof performance, because humic acid is an unstable structure and has hydrophilic properties. When encountering water, the humic acid coating will immediately absorb water and swell, and lose the slow-release performance

Method used

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  • Humic acid long-acting compound fertilizer and its preparing method
  • Humic acid long-acting compound fertilizer and its preparing method
  • Humic acid long-acting compound fertilizer and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Humic acid long-acting compound fertilizer of the present invention, its composition by weight ratio, is made up of 25~40 parts of humic acid urea-formaldehyde complexes and 7560 parts of soluble nitrogen, phosphorus and potassium fertilizers, wherein: the weight ratio between soluble nitrogen, phosphorus and potassium fertilizers 12~25: 30~40: 10~20; the raw materials of the humic acid urea formaldehyde complex are calculated by weight ratio, consisting of 15~30 parts of peat powder, 31~46 parts of urea, 1~2 parts of ammonium chloride And 36~42 parts concentration is the formaldehyde composition of 30%.

[0029] The preparation of its humic acid nitrogen fertilizer complex:

[0030] Using peat powder, urea, ammonium chloride and formaldehyde as raw materials, first condense urea and formaldehyde (molar molecular ratio: 1:2.0-2.5) in an alkaline solution (pH 7-8) at 50-95°C for 5- 30 minutes;

[0031] Then add ammonium chloride to adjust the pH of the solution to 4-5;...

Embodiment 2

[0043] The preparation process of the humic acid urea-formaldehyde complex is the same as in Example 1, the difference is that at first 12 kilograms of urea and 42 kilograms of 30% industrial formaldehyde (molar ratio is 1: 2.1) are mixed, and then with saturated NaOH solution Adjust the pH of the mixed solution to 7.5, and condense for 20 minutes at a solution 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 the solution, At this time, the molar ratio of urea to formaldehyde is 1.4:1, keep the solution temperature 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 1.5 hours at 70-80°C, the product was air-dried, dried, crushed and passed through an 80-mesh sieve to obtain a gray-black powder humic acid urea-formaldehyde complex.

[0044] 33.5 kilograms of humic acid ...

Embodiment 3

[0046] The preparation process of humic acid urea-formaldehyde complex is the same as in Example 1, but the difference is that at first 9 kilograms of urea and 36 kilograms of 30% industrial formaldehyde (molar molecular ratio is 1: 2.4) are mixed, and then mixed with saturated NaOH solution Adjust the pH of the mixed solution to 7.8, and condense for 10 minutes at a solution temperature of 80 to 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 the solution. When the molar ratio of urea and formaldehyde is 1.5:1, keep the solution temperature at 70-80°C, 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°C. ~90°C for 0.5 hours, the product was air-dried, dried, crushed and passed through an 80-mesh sieve to obtain a gray-black powder humic acid urea-formaldehyde complex.

[0047] 40 kilogram...

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Abstract

The present invention relates to long-acting compound fertilizer, and is especially a kind of long-acting compound humic acid fertilizer. The long-acting compound humic acid fertilizer consists of composite of humic acid, urea and formaldehyde in 25-40 wt% and soluble nitrogen fertilizer, phosphate fertilizer and potash fertilizer 60-75 wt%. The composite of composite of humic acid, urea and formaldehyde consists of turf, urea, ammonium and formaldehyde solution; and the soluble nitrogen fertilizer, phosphate fertilizer and potash fertilizer are in the weight ratio of 12-25 to 30-40 to 10-20. The product is suitable for various soil, especially for growing green vegetable, flower and fruit tree.

Description

technical field [0001] The invention relates to a long-acting compound fertilizer, in particular to a humic acid long-acting compound fertilizer and a preparation method thereof. Background technique [0002] In the prior art, conventional chemical nitrogen fertilizers have good water solubility and are easily lost after being applied to the soil. into an invalid state, especially in calcareous soils. Therefore, it is necessary to develop and produce slow and controlled release fertilizers that can not only maintain the long-term effect of nitrogen fertilizer but also reduce the fixation of phosphorus fertilizer. [0003] Using humic acid as raw material to prepare organic compound fertilizer is a major invention in fertilizer manufacturing technology. Humic acid is an unstable porous, network polymer structure, 50% to 55% of its structure is composed of amino acids, ethanolamine, polycyclic aromatic nuclei, and oxygen-containing functional groups, and has huge surface ene...

Claims

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Application Information

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IPC IPC(8): C05C9/02C05F11/02C05G3/00C05G5/00
Inventor 张海军武志杰陈利军梁文举
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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