Method for preparing long-acting slow-release nitrogenous fertilizer through ureaformaldehyde composite glycolic acid

A technology of compound glycolic acid and glycolic acid, applied in urea compound fertilizer, nitrogen fertilizer, ammonium nitrate fertilizer and other directions, can solve the problem of difficulty in meeting the needs of rapid development, and achieve the effect of reducing fertilizer consumption, reducing cost and prolonging fertilizer efficiency.

Inactive Publication Date: 2016-03-02
GUIZHOU RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there is a large amount of research on slow-release fertilizers, soil conditioners, Austrian fertilizers, etc. in the prior art, it is still difficult to meet the needs of the rapid development of modern agriculture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing long-acting slow-release nitrogen fertilizer with urea-formaldehyde compound glycolic acid, comprising the following steps:

[0025] (1) After mixing urea-formaldehyde and glycolic acid at a molar ratio of 1:0.5, heat it at 70°C for 10 minutes, then add potassium dihydrogen phosphate, ammonium nitrate, calcium carbonate powder, and zinc sulfate to it and mix them , put it at a temperature of 100°C and a stirring speed of 300r / min for 20 minutes, then put it in a granulator to granulate, and bake it at a temperature of 40°C for 10 minutes, and set it aside;

[0026] (2) After urea-formaldehyde and glycolic acid are mixed according to the molar ratio of 1:0.1, it is processed into a molten state, and the composite slurry is obtained; at the same time, nitrogen, phosphorus and potassium compound fertilizer is taken, and after it is processed into a molten state, the composite fertilizer slurry is obtained;

[0027] (3) Take fresh phosphogypsum, adjus...

Embodiment 2

[0032] A method for preparing long-acting slow-release nitrogen fertilizer with urea-formaldehyde compound glycolic acid, comprising the following steps:

[0033] (1) After mixing urea-formaldehyde and glycolic acid at a molar ratio of 1:1.1, heat it at 90°C for 20 minutes, and then add potassium dihydrogen phosphate, ammonium nitrate, calcium carbonate powder, and zinc sulfate to it. , put it at a temperature of 130°C, stir at a stirring speed of 500r / min for 50min, then place it in a granulator to granulate, bake at a temperature of 60°C for 20min, and set aside;

[0034] (2) After mixing urea-formaldehyde and glycolic acid according to the molar ratio of 1:0.3, it is processed into a molten state to form a composite slurry; at the same time, nitrogen, phosphorus and potassium compound fertilizer is processed into a molten state to obtain a composite fertilizer slurry;

[0035](3) Take fresh phosphogypsum, adjust the phosphogypsum into a slurry, mix the particles prepared in...

Embodiment 3

[0040] A method for preparing long-acting slow-release nitrogen fertilizer with urea-formaldehyde compound glycolic acid, comprising the following steps:

[0041] (1) After mixing urea-formaldehyde and glycolic acid at a molar ratio of 1:0.8, heat it at 80°C for 15 minutes, then add potassium dihydrogen phosphate, ammonium nitrate, calcium carbonate powder, and zinc sulfate to it and mix , put it at a temperature of 120°C and a stirring speed of 400r / min for 40 minutes, then put it in a granulator to granulate, and bake it at a temperature of 50°C for 15 minutes, and set it aside;

[0042] (2) After mixing urea-formaldehyde and glycolic acid according to the molar ratio of 1:0.2, it is processed into a molten state to form a composite slurry; at the same time, nitrogen, phosphorus and potassium compound fertilizer is processed into a molten state to obtain a composite slurry;

[0043] (3) Take fresh phosphogypsum, adjust the phosphogypsum into a slurry, mix the particles prepa...

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PUM

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Abstract

The invention relates to the technical field of long-acting nitrogenous fertilizers, particularly to a method for preparing a long-acting slow-release nitrogenous fertilizer through ureaformaldehyde composite glycolic acid. The method comprises the following steps: after research on a mechanism of the interaction between ureaformaldehyde and glycolic acid, mixing ureaformaldehyde with glycolic acid; after mixing under the conditions of a certain temperature and molar ratio, adding monopotassium phosphate, ammonium nitrate, calcium carbonate powder and zinc sulfate into the mixture, and carrying out mixing granulation, so as to effectively carrying out bonding and mixing on the nutrients in the fertilizer; after granulation, reacting with phosphorus gypsum slurry to form a layer of water-containing phosphorus gypsum slurry on the surfaces of the particles; after adjusting the granularity, carrying out alternate guniting wrapping through adopting composite slurry and compound fertilizer slurry, so as to form a multi-layered structure on the surfaces of the particles during the treatment process; and drying at relatively high temperature after guniting, so as to enable the water molecules in the inner ardealite to emit from inside to outside, form irregular pores in the particles, increase the nutrient releasing rate of the fertilizer, and prolong the slow release period of the fertilizer.

Description

technical field [0001] The invention relates to the technical field of long-acting nitrogen fertilizers, in particular to a method for preparing long-acting slow-release nitrogen fertilizers by compounding urea-formaldehyde with glycolic acid. Background technique [0002] With the rapid development of agriculture, agricultural fertilizers and other related technical fields have been developed rapidly, which has increased the output of agricultural products through the use of chemical fertilizers in the agricultural field, which has increased the profits of agricultural products to a certain extent; with the long-term use of chemical fertilizers The use of chemical fertilizers and their own characteristics make it impossible to guarantee the long-term nutritional needs of crops when using chemical fertilizers for fertilization, so that in the process of planting agricultural products, it is necessary to apply topdressing fertilizers to meet the requirements, otherwise, it wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G3/00C05G5/30C05C1/00C05C9/02C05D3/00C05D3/02C05D9/02C05G1/00C05G5/12
Inventor 田娟周昌平杨杰陈思帆陈文兴王瑶
Owner GUIZHOU RES INST OF CHEM IND
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