CN115677409A - High-nitrogen compound fertilizer and preparation method thereof - Google Patents
High-nitrogen compound fertilizer and preparation method thereof Download PDFInfo
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- CN115677409A CN115677409A CN202211402321.5A CN202211402321A CN115677409A CN 115677409 A CN115677409 A CN 115677409A CN 202211402321 A CN202211402321 A CN 202211402321A CN 115677409 A CN115677409 A CN 115677409A
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Abstract
The invention discloses a high-nitrogen compound fertilizer and a preparation method thereof. The preparation method of the high-nitrogen compound fertilizer comprises the following steps: (1) Mixing conventional compound fertilizers according to a proportion to obtain a first material; (2) Carrying out primary coating on the first material by using urea to obtain a primary coated compound fertilizer; (3) And coating the primary coated compound fertilizer for the second time by using coating oil to obtain the high-nitrogen compound fertilizer. According to the invention, urea is firstly utilized to carry out primary coating on the conventional compound fertilizer, so that the nitrogen content in the produced compound fertilizer is between 28% and 30%, and the quality of the compound fertilizer is greatly improved; and the surface of the compound fertilizer is further coated with coating oil for the second time to form the compound fertilizer with a double-layer film structure, so that the adhesion and caking of compound fertilizer particles are prevented, the urea is prevented from being decomposed due to environmental factors such as temperature and humidity, and the stable high nitrogen content of the compound fertilizer is ensured.
Description
Technical Field
The invention belongs to the technical field of fertilizers, and particularly relates to a high-nitrogen compound fertilizer and a preparation method thereof.
Background
In agricultural production, various compound fertilizers are widely used, nitrogen is one of main elements in the compound fertilizer, and nitrogen plays a very important role in crop growth, is a component of amino acid in plants, is a component of protein and is also a component of chlorophyll which plays a determining role in photosynthesis of plants. Nitrogen can also aid in crop colonization. The application of the fertilizer containing nitrogen can not only improve the yield of agricultural products, but also improve the quality of the agricultural products. Therefore, the method has very important significance for ensuring the content of the nitrogen element in the compound fertilizer. Practice proves that the nitrogen content in the compound fertilizer is optimal between 26 and 30 percent. However, because the urea has low decomposition temperature, high solubility and is very sensitive to moisture and temperature, the content of nitrogen element in the existing compound fertilizer is low, and the process of producing the compound fertilizer has the technical problem of ensuring the content of the nitrogen element to be between 26 and 30 percent.
At present, in order to improve the nitrogen content of the compound fertilizer, nitrogen-containing substances such as ammonium hydrogen phosphate and the like are generally added into reciprocating fertilizer mixing particles in a large proportion, but the nitrogen content of the formed compound fertilizer is still not high and is less than 20%.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-nitrogen compound fertilizer and a preparation method thereof, and the nitrogen content of the compound fertilizer prepared by the invention is stabilized between 28 percent and 30 percent, thereby greatly improving the quality of the compound fertilizer.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of a high-nitrogen compound fertilizer comprises the following steps:
(1) Mixing conventional compound fertilizers according to a proportion to obtain a first material;
(2) Carrying out primary coating on the first material by using urea to obtain a primary coated compound fertilizer;
(3) And coating the primary coated compound fertilizer for the second time by using coating oil to obtain the high-nitrogen compound fertilizer.
Preferably, the conventional compound fertilizer of step (1) comprises potassium chloride, ammonium chloride and phosphoric acid.
Preferably, the mass ratio of the potassium chloride to the ammonium chloride to the phosphoric acid is (9-11): (8-10): (15-17).
Preferably, the mass ratio of the urea to the first material in the step (2) is 145kg:1t.
Preferably, the primary coating method in step (2) is as follows: adding the first material into a first coating machine, heating and melting the urea, pumping the urea into the first coating machine, and rotating the first coating machine to coat the urea on the surface of the first material.
Preferably, the temperature of the heating and melting is 130-140 ℃.
Preferably, the coating oil in the step (3) accounts for 10-15% of the weight of the primary coated compound fertilizer.
Preferably, the secondary coating method in step (3) is as follows: and (3) leading the compound fertilizer coated once into a second coating machine, then pumping coating oil into the second coating machine, and rotating the second coating machine to coat the coating oil on the surface of the compound fertilizer coated once.
Preferably, before the secondary coating in the step (3), the method further comprises the step of sending the primary coated compound fertilizer into a cooling barrel for cooling.
A high-nitrogen compound fertilizer prepared by the preparation method of the high-nitrogen compound fertilizer.
The invention has the beneficial effects that:
according to the invention, urea is firstly utilized to carry out primary coating on the conventional compound fertilizer, so that the nitrogen content in the produced compound fertilizer is between 28 and 30 percent, and the quality of the compound fertilizer is greatly improved; and further, the surface of the composite fertilizer is coated with coating oil for the second time to form the composite fertilizer with a double-layer structure, so that the adhesion and caking of composite fertilizer particles are prevented, the urea is prevented from being decomposed due to environmental factors such as temperature and humidity, and the stable high nitrogen content of the composite fertilizer is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A preparation method of a high-nitrogen compound fertilizer comprises the following steps:
(1) Weighing 1t of potassium chloride, ammonium chloride and phosphoric acid according to a mass ratio of 9;
(2) Adding 145kg of urea into a urea tank, heating to 140 ℃ to melt the urea into liquid, pumping the liquid urea into a first coating machine, and covering and wrapping the liquid urea on the outer surfaces of compound fertilizer particles along with the rotation of the first coating machine to obtain a primary coated compound fertilizer;
(3) Guiding out the primary coated compound fertilizer, then sending the primary coated compound fertilizer into a cooling cylinder (the inner wall of the cooling cylinder is provided with an L-shaped shoveling plate which can accelerate cooling), cooling the primary coated compound fertilizer by using a fan, and guiding the cooled material into a second film wrapping machine;
(4) Pumping the coating oil which accounts for 15% of the weight of the compound fertilizer coated at one time in the oil bin into a second coating machine, so that the coating oil covers the surfaces of the compound fertilizer particles coated at one time along with the rotation of the second coating machine, and obtaining the high-nitrogen compound fertilizer.
Example 2
A preparation method of a high-nitrogen compound fertilizer comprises the following steps:
(1) Weighing 1t of potassium chloride, ammonium chloride and phosphoric acid according to the mass ratio of 11;
(2) Adding 145kg of urea into a urea tank, heating to 130 ℃ to melt the urea into liquid, pumping the liquid urea into a first coating machine, and covering and wrapping the liquid urea on the outer surfaces of compound fertilizer particles along with the rotation of the first coating machine to obtain a primary coated compound fertilizer;
(3) Guiding out the primary coated compound fertilizer, then sending the primary coated compound fertilizer into a cooling cylinder (the inner wall of the cooling cylinder is provided with an L-shaped shoveling plate which can accelerate cooling), cooling the primary coated compound fertilizer by using a fan, and guiding the cooled material into a second film wrapping machine;
(4) Pumping coating oil which accounts for 12% of the weight of the compound fertilizer coated at one time in the oil bin into a second coating machine, and enabling the coating oil to cover the surfaces of the compound fertilizer particles coated at one time along with the rotation of the second coating machine to obtain the high-nitrogen compound fertilizer.
Example 3
A preparation method of a high-nitrogen compound fertilizer comprises the following steps:
(1) Weighing 1t of potassium chloride, ammonium chloride and phosphoric acid according to the mass ratio of 10;
(2) Adding 145kg of urea into a urea tank, heating to 140 ℃ to melt the urea into liquid, pumping the liquid urea into a first coating machine, and covering and wrapping the liquid urea on the outer surfaces of compound fertilizer particles along with the rotation of the first coating machine to obtain a once-coated compound fertilizer;
(3) Guiding out the primary coated compound fertilizer, then sending the primary coated compound fertilizer into a cooling cylinder (the inner wall of the cooling cylinder is provided with an L-shaped shoveling plate which can accelerate cooling), cooling the primary coated compound fertilizer by using a fan, and guiding the cooled material into a second film wrapping machine;
(4) Pumping the coating oil which accounts for 10 percent of the weight of the compound fertilizer coated at one time in the oil bin into a second coating machine, so that the coating oil covers the surfaces of the compound fertilizer particles coated at one time along with the rotation of the second coating machine, and obtaining the high-nitrogen compound fertilizer.
Comparative example 1
A preparation method of a compound fertilizer comprises the following steps:
(1) Weighing 1t of potassium chloride, ammonium chloride and phosphoric acid according to a mass ratio of 9;
(2) Adding 145kg of urea into a urea tank, heating to 140 ℃ to melt the urea into liquid, pumping the liquid urea into a first coating machine, and covering and wrapping the liquid urea on the outer surfaces of compound fertilizer particles along with the rotation of the first coating machine to obtain the compound fertilizer coated with the urea.
Comparative example 2
(1) Weighing 1t of potassium chloride, ammonium chloride and phosphoric acid according to the mass ratio of 9;
(2) Pumping 150kg of coating oil in the oil bin into a first coating machine, and enabling the coating oil to cover the surfaces of compound fertilizer particles along with the rotation of the first coating machine to obtain the compound fertilizer coated by the coating oil.
The contents of elements in the compound fertilizers prepared in examples 1 to 3 and comparative examples 1 to 2 were measured, and the results are shown in table 1.
TABLE 1
| Numbering | N | P 2 O 5 | K 2 O | C1 |
| Example 1 | 29.5％ | 23.6％ | 3.2％ | 11.1％ |
| Example 2 | 29.1％ | 14.5％ | 5.5％ | 10.8％ |
| Example 3 | 28.6％ | 20.7％ | 4.3％ | 11.7％ |
| Comparative example1 | 17.2％ | 21.2％ | 4.5％ | 15.6％ |
| Comparative example 2 | 13.6％ | 15.6％ | 3.8％ | 16.2％ |
As can be seen from Table 1, the nitrogen content of the compound fertilizer prepared in the embodiment of the invention is between 28% and 30%, which is obviously higher than that of the compound fertilizer prepared in the comparative examples 1-2, so that the compound fertilizer is shown to have a double-layer film structure formed by primary coating with urea and secondary coating with coating oil, not only high nitrogen content is obtained, but also urea can be prevented from being decomposed due to environmental factors such as temperature, humidity and the like, and the compound fertilizer has stable high nitrogen content.
It should be noted that the above embodiments belong to the same inventive concept, and the description of each embodiment has a different emphasis, and reference may be made to the description in other embodiments where the description in individual embodiments is not detailed.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The preparation method of the high-nitrogen compound fertilizer is characterized by comprising the following steps of:
(1) Mixing conventional compound fertilizers according to a proportion to obtain a first material;
(2) Carrying out primary coating on the first material by using urea to obtain a primary coated compound fertilizer;
(3) And coating the primary coated compound fertilizer for the second time by using coating oil to obtain the high-nitrogen compound fertilizer.
2. The method for preparing a high-nitrogen compound fertilizer according to claim 1, wherein the conventional compound fertilizer of step (1) comprises potassium chloride, ammonium chloride and phosphoric acid.
3. The preparation method of the high-nitrogen compound fertilizer as claimed in claim 2, wherein the mass ratio of the potassium chloride to the ammonium chloride to the phosphoric acid is (9-11): (8-10): (15-17).
4. The method for preparing a high-nitrogen compound fertilizer according to claim 1, wherein the mass ratio of the urea in the step (2) to the first material is 145kg:1t.
5. The method for preparing a high-nitrogen compound fertilizer according to claim 1, wherein the primary coating method in the step (2) comprises the following steps: adding the first material into a first coating machine, heating and melting the urea, pumping the urea into the first coating machine, and rotating the first coating machine to coat the urea on the surface of the first material.
6. The method for preparing a high-nitrogen compound fertilizer according to claim 5, wherein the temperature of the heating and melting is 130-140 ℃.
7. The method for preparing a high-nitrogen compound fertilizer according to claim 1, wherein the coating oil in the step (3) accounts for 10-15% of the weight of the once-coated compound fertilizer.
8. The method for preparing a high-nitrogen compound fertilizer as claimed in claim 1, wherein the secondary coating method in step (3) is: and (3) leading the compound fertilizer coated once into a second coating machine, then pumping coating oil into the second coating machine, and rotating the second coating machine to coat the coating oil on the surface of the compound fertilizer coated once.
9. The method for preparing a high-nitrogen compound fertilizer as claimed in claim 1, wherein before the secondary coating in step (3), the method further comprises the step of sending the primary coated compound fertilizer into a cooling barrel for cooling.
10. The high-nitrogen compound fertilizer prepared by the preparation method of the high-nitrogen compound fertilizer according to any one of claims 1 to 9.
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| CN1569773A (en) * | 2004-04-27 | 2005-01-26 | 山东农业大学 | Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat |
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| CN113105286A (en) * | 2021-03-31 | 2021-07-13 | 广东凯米瑞特肥科技有限公司 | Preparation method of coated fertilizer with longer nutrition effect and coated fertilizer |
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| CN1569773A (en) * | 2004-04-27 | 2005-01-26 | 山东农业大学 | Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat |
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