CN110963840A - High-strength compound fertilizer and preparation method thereof - Google Patents
High-strength compound fertilizer and preparation method thereof Download PDFInfo
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- CN110963840A CN110963840A CN201911396849.4A CN201911396849A CN110963840A CN 110963840 A CN110963840 A CN 110963840A CN 201911396849 A CN201911396849 A CN 201911396849A CN 110963840 A CN110963840 A CN 110963840A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
Abstract
The invention provides a preparation method of a high-strength compound fertilizer, which replaces liquid phase substances in the granulation process in the prior art, uses reaction liquid of phosphoric acid and urea (urea phosphate) as liquid phase of granulation materials, can well stick the materials in a formula together, improves the particle strength of the fertilizer, avoids the use of adhesives due to the use of the urea phosphate, effectively ensures nutrients under the unit weight of the fertilizer, and can effectively promote the growth of subsequent crops.
Description
Technical Field
The invention belongs to the technical field of compound fertilizers, and particularly relates to a high-strength compound fertilizer and a preparation method thereof.
Background
The compound fertilizer can be divided into compound fertilizer and organic-inorganic compound fertilizer according to whether organic matters exist, wherein the compound fertilizer refers to fertilizer which is prepared by a chemical method and/or a mixing method and has at least two nutrients with indicated amounts in three nutrients of nitrogen, phosphorus and potassium. The organic-inorganic compound fertilizer refers to compound fertilizer containing a certain amount of organic matters.
The compound fertilizer has the advantages of high nutrient content, less side components, good physical properties and the like, has very important functions of balanced fertilization, improvement of the utilization rate of the fertilizer and promotion of high and stable yield of crops, and is more and more popular with farmers along with the development of agricultural production.
The granulation method of the compound fertilizer mainly comprises a granulation method, a slurry method, a melt method and the like, and the used principle of different established methods is different, so that the strength of fertilizer particles is different, and the hardening and pulverization of products are influenced.
In order to improve the strength of the fertilizer, a binder is generally added in the granulation process, or raw materials with better viscosity are used, so that the viscosity of the materials is increased, the aggregation of the materials in the granulation process is promoted, and the granule strength is improved. However, the addition of such binders does not provide nutrients, increases costs, and does not clearly affect the subsequent crop growth.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the preparation method of the high-strength compound fertilizer, which can effectively improve the particle hardness of the finished fertilizer and effectively ensure the available nutrients of fertilizer particles in unit weight.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of a high-strength compound fertilizer comprises the following steps:
A. weighing corresponding raw material components according to a preset raw material proportion of the compound fertilizer;
B. b, putting the raw material components weighed in the step A into a granulator to obtain a prefabricated compound fertilizer;
C. screening the prefabricated compound fertilizer obtained in the step B to obtain a primary compound fertilizer with consistent particle size;
D. c, cooling the preliminary compound fertilizer in the step C to obtain a finished product compound fertilizer;
and B, in the step B, when the granulator works, the liquid-phase solution is urea phosphate solution.
Also comprises a high-strength compound fertilizer which contains two or three nutrients of nitrogen, phosphorus and potassium.
The application principle of the invention is as follows:
urea phosphate, also known as urea phosphoric acid or urea phosphate, is a complex formed by the reaction of urea and phosphoric acid. The urea phosphate contains 17.7 percent of nitrogen and 19.6 percent of phosphorus (P2O544.9 percent), and can be used for producing high-efficiency nitrogen and phosphorus compound fertilizers.
Based on the technical scheme, the liquid phase solution in the granulator used in the fertilizer granulation process is replaced (the liquid phase of the original granulator is water), and the reaction liquid of phosphoric acid and urea (urea phosphate) is used as the liquid phase of the granulated material, so that the formulated materials can be well adhered together, and the granule strength of the fertilizer is improved.
Compared with the prior art, the invention has the following beneficial effects:
the method replaces the liquid phase involved in the granulation process, can be effectively suitable for the production of various compound fertilizers, compares the raw materials with the same proportion, and compared with the prior art that water is used as the liquid phase, the compound fertilizer produced by the method has higher hardness of the obtained fertilizer particles, avoids the use of a bonding agent due to the use of urea phosphate, effectively ensures the nutrients under the unit weight of the fertilizer, and can effectively promote the growth of subsequent crops.
Detailed Description
The present invention will be further described with reference to the following examples, but the embodiments of the present invention are not limited to the scope of the examples.
Example 1
A preparation method of a high-strength compound fertilizer comprises the following steps:
A. weighing corresponding raw material components according to a preset raw material proportion of the compound fertilizer;
B. b, putting the raw material components weighed in the step A into a granulator to obtain a prefabricated compound fertilizer;
C. screening the prefabricated compound fertilizer obtained in the step B to obtain a primary compound fertilizer with consistent particle size;
D. c, cooling the preliminary compound fertilizer in the step C to obtain a finished product compound fertilizer;
and B, in the step B, when the granulator works, the liquid-phase solution is urea phosphate solution.
The method replaces the liquid phase involved in the granulation process, can be effectively suitable for the production of various compound fertilizers, compares the raw materials with the same proportion, and compared with the prior art that water is used as the liquid phase, the compound fertilizer produced by the method has higher hardness of the obtained fertilizer particles, avoids the use of a bonding agent due to the use of urea phosphate, effectively ensures the nutrients under the unit weight of the fertilizer, and can effectively promote the growth of subsequent crops.
The urea phosphate solution can not be used in all states, and the urea phosphate solution involved in the method is obtained by the following production steps:
s1, according to urea: weighing corresponding urea and phosphoric acid according to the molar mass ratio of 0.8-1.5 of phosphoric acid for later use;
s2, putting the phosphoric acid and urea weighed in the step S1 into a constant temperature reactor for reaction, controlling the reaction temperature in the constant temperature reactor to be 60-90 ℃, and controlling the reaction time to be 10-35 min to produce the urea phosphate solution.
Wherein, the concentration of the phosphoric acid in the step S1 is 40-70%. The reactor is a reaction device with a stirring device in the prior art.
The following data are corresponding small-test raw material proportioning data:
1. weighing 85g of phosphoric acid with the concentration of 40% as a raw material, and mixing the raw materials according to the weight ratio of urea: weighing 16.66g of corresponding urea according to the molar mass ratio of the phosphoric acid of 0.8, adding the phosphoric acid and the urea into a reactor, and reacting for 10 minutes at the temperature of 60 ℃ to obtain the group 1 urea phosphate solution.
2. 85g of phosphoric acid with the concentration of 55% is taken as a raw material, and the weight ratio of urea: weighing 28.62g of corresponding urea according to the molar mass ratio of the phosphoric acid to 1, adding the phosphoric acid and the urea into a reactor, and reacting for 15 minutes at the controlled temperature of 70 ℃ to obtain a group 2 urea phosphate solution.
3. Taking 60% phosphoric acid as a raw material, weighing 85g, and mixing the following raw materials: 34.34g of urea corresponding to the phosphoric acid with the molar mass ratio of 1.1 is weighed, the phosphoric acid and the urea are added into a reactor, and the reaction is carried out for 20 minutes under the condition of controlling the temperature at 80 ℃ to obtain the urea phosphate solution of the group 3.
4. Weighing 85g of phosphoric acid with the concentration of 65% as a raw material, and mixing the raw materials according to the weight ratio of urea: weighing 40.60g of corresponding urea according to the molar mass ratio of the phosphoric acid of 1.2, adding the phosphoric acid and the urea into a reactor, and reacting for 25 minutes at the controlled temperature of 85 ℃ to obtain the urea phosphate solution of the group 4.
5. Taking phosphoric acid with the concentration of 70% as a raw material, weighing 85g, and mixing according to the weight ratio of urea: 47.36g of urea corresponding to the phosphoric acid with the molar mass ratio of 1.3 are weighed, the phosphoric acid and the urea are added into a reactor, and the reaction is carried out for 30 minutes under the condition of controlling the temperature at 90 ℃ to obtain the 5 th group of urea phosphate solution.
The 1-5 groups of urea phosphate solutions can be used as liquid phase solutions in a granulation stage in the production process of the compound fertilizer, so that the strength of the prepared fertilizer particles is improved, and in order to effectively verify the effect of the urea phosphate solutions in the production process of the fertilizer, a corresponding compound fertilizer formula is required to be provided based on the production method disclosed by the invention to verify the effect of the method.
Example 2
Based on the above, the invention also relates to a high-strength compound fertilizer, which comprises two or three nutrients of nitrogen, phosphorus and potassium, wherein the fertilizer containing the two or three nutrients of nitrogen, phosphorus and potassium is called the compound fertilizer; the fertilizer containing two or three nutrients of nitrogen, phosphorus and potassium and organic matter is organic-inorganic compound fertilizer.
The production process of the compound fertilizer and the organic-inorganic compound fertilizer both involve the process of mixing the compound fertilizer and the organic-inorganic compound fertilizer in advance and granulating the mixture, and the granulating process is completed by adhering and granulating the materials in a granulator through atomized liquid phase solution.
Example 3
The nitrogen nutrient in the verified high-strength compound fertilizer is provided by a nitrogen fertilizer, the potassium nutrient is provided by a potassium fertilizer, the phosphorus nutrient is provided by a phosphate fertilizer, and the organic matter is provided by an organic fertilizer; correspondingly, the nitrogenous fertilizer, the phosphate fertilizer, the potash fertilizer and the organic fertilizer comprise the following components:
1. the potash fertilizer comprises one or two of potassium sulfate and potassium chloride;
2. the phosphate fertilizer comprises one or two of monoammonium phosphate, calcium magnesium phosphate, superphosphate and diammonium phosphate;
3. the nitrogen fertilizer comprises one or more of urea, ammonium sulfate, ammonium chloride and ammonium bicarbonate;
4. the organic fertilizer comprises one or more of humic acid, fermented and decomposed livestock and poultry manure, sugar residue, vinasse, soybean meal, biochemical sludge, weathered coal, unite bran, rice bran, wheat bran, plant ash and amino acid.
Example 4
A granulation pilot test is carried out by taking a compound fertilizer as an experimental raw material, wherein the raw material of the compound fertilizer comprises ammonium bicarbonate, monoammonium phosphate, urea, ammonium chloride and potassium chloride, and the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: the mass ratio of the potassium chloride is 0.8-1.1:5.5-6.5:0.9-1.2:6.5-7.5: 4.8-5.3.
1. According to the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: weighing two parts of 80g ammonium bicarbonate, 550g monoammonium phosphate, 90g urea, 650g ammonium chloride and 480g potassium chloride respectively according to the mass ratio of the potassium chloride being 0.8:5.5:0.9:6.5:4.8 to form two parts of raw materials for later use, wherein the two parts of raw materials are respectively an experimental group 1 and a comparative group 1;
2. according to the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: weighing two parts of 90g of ammonium bicarbonate, 580g of monoammonium phosphate, 100g of urea, 680g of ammonium chloride and 490g of potassium chloride according to the mass ratio of the potassium chloride to the potassium chloride of 0.9:5.8:1.0:6.8:4.9, and forming two parts of raw materials for later use, wherein the two parts of raw materials are respectively an experimental group 2 and a comparative group 2;
3. according to the formula of ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: weighing 95g of ammonium bicarbonate, 600g of monoammonium phosphate, 110g of urea, 700g of ammonium chloride and 500g of potassium chloride according to the mass ratio of the potassium chloride to the potassium chloride of 0.95:6.0:1.1:7.0:5.0 to form two parts of raw materials for later use, wherein the two parts of raw materials are respectively an experimental group 3 and a comparative group 3;
4. according to the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: weighing 100g of ammonium bicarbonate, 620g of monoammonium phosphate, 115g of urea, 720g of ammonium chloride and 510g of potassium chloride according to the mass ratio of the potassium chloride to the potassium chloride of 1:6.2:1.15:7.2:5.1 to form two raw materials for later use, wherein the two raw materials are respectively an experimental group 4 and a comparative group 4;
5. according to the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: weighing two parts of 110g of ammonium bicarbonate, 650g of monoammonium phosphate, 120g of urea, 750g of ammonium chloride and 530g of potassium chloride according to the mass ratio of the potassium chloride to the potassium chloride of 1.1:6.5:1.2:7.5:5.3 to form two parts of raw materials for later use, wherein the two parts of raw materials are respectively an experimental group 5 and a comparative group 5;
the starting materials of experimental groups 1 to 5 were granulated as follows:
mixing and crushing the raw materials in the experimental groups 1-5 respectively, and then granulating in a granulator, wherein the liquid phase solution in the granulator is atomized tap water; the atomized and sprayed materials are subjected to flowing bonding granulation in a granulator, and the granulated compound fertilizer is subjected to two-stage drying, screening, cooling and other subsequent processes to obtain 1-5 groups of compound fertilizers of experimental compositions; wherein the screened large-particle fertilizer is crushed and then returns to a granulator as a return material together with fine powder for re-granulation.
The raw materials in the comparative groups 1-5 are produced according to the production method, wherein when the raw materials in the comparative group 1 are used for producing the compound fertilizer, the liquid phase solution in the granulator uses the urea phosphate solution of the group 1 in the example 1 to produce the compound fertilizer of the comparative group 1; when the raw materials in the comparative group 2 are used for producing the compound fertilizer, the liquid phase solution in the granulator uses the urea phosphate solution in the group 2 in the example 1 to produce the compound fertilizer of the comparative group 2; when the raw materials in the comparative group 3 are used for producing the compound fertilizer, the liquid phase solution in the granulator uses the urea phosphate solution of the group 3 in the example 1 to produce the compound fertilizer of the comparative group 3; when the raw materials in the comparative group 4 are used for producing the compound fertilizer, the liquid phase solution in the granulator uses the urea phosphate solution of the group 4 in the example 1 to produce the compound fertilizer of the comparative group 4; when the raw materials in the comparative group 5 are used for producing the compound fertilizer, the liquid phase solution in the granulator uses the 5 th group urea phosphate solution in the example 1 to produce the 5 th group comparative finished compound fertilizer.
Detecting the particle hardness of the 1-5 groups of experimental finished compound fertilizers and the 1-5 groups of comparative finished compound fertilizers obtained by the production,
the particle hardness detection method of the compound fertilizer comprises the following steps: the hardness of 20 fertilizers randomly extracted from each batch (5 experimental groups and 5 control groups) of compound fertilizers is detected, a pressure-resistant experiment is carried out on each fertilizer by using a pressure-type strength tester, the measured data when fertilizer particles are crushed is the hardness value of the fertilizer particles, the experiment is repeated for 20 times in each batch, and the average value of the experimental data of 20 fertilizers is taken to obtain the hardness data of the fertilizer particles of the 5 experimental groups and the 5 control groups shown in the table 1:
| name of Compound fertilizers | Particle hardness (N) | Hardness of the granules after two weeks of storage (Unit) |
| Group 1 experiment finished compound fertilizer | 12.1 | 9.8 |
| No. 1 group comparison finished product compound fertilizer | 17.2 | 30.1 |
| Experiment 2 group finished product compound fertilizer | 11.2 | 9.4 |
| No. 2 group comparison finished product compound fertilizer | 17.3 | 27.3 |
| Group 3 experiment finished compound fertilizer | 13.2 | 8.9 |
| No. 3 contrast finished compound fertilizer | 20.1 | 29.6 |
| Group 4 experiment finished compound fertilizer | 10.4 | 9.9 |
| No. 4 contrast finished compound fertilizer | 16.5 | 29.1 |
| Group 5 experiment finished compound fertilizer | 12.4 | 10.7 |
| No. 5 contrast finished compound fertilizer | 19.2 | 25.7 |
TABLE 1
As can be seen from table 1, the compound fertilizer produced by using the same raw material formulation and the same process flow is only replaced by the liquid phase solution in the granulation process, and it is obvious that when the urea phosphate solution provided by the method is used as the liquid phase solution of the granulator for production, the particle strength of the obtained compound fertilizer is obviously higher, and the particle hardness of the compound fertilizer produced by the method after being placed for two weeks is obviously increased compared with the particle strength of the compound fertilizer produced by the prior art.
Meanwhile, the raw material proportion of the compound fertilizer is wider than the application range of the compound fertilizer in the prior art, and the compound fertilizer can be applied to soil with high potassium deficiency and is beneficial to absorption and growth of plants.
The compound fertilizer produced by the compound fertilizer formula and the production process has higher hardness of fertilizer particles, and stronger agglomeration capacity in the fertilizer particles, so that the compound fertilizer particles have stronger anti-volatilization capacity and longer storage time.
Example 5
As the compound fertilizer also relates to an organic-inorganic compound fertilizer besides the compound fertilizer, the raw materials of the organic-inorganic compound fertilizer mainly comprise the following components in proportion:
nitrogenous fertilizer: phosphate fertilizer: and (3) potassium fertilizer: the mass ratio of the organic fertilizer is 1.5-2.5:0.8-1.3:0.7-1.2: 1.2-1.8.
The invention mainly relates to an organic-inorganic compound fertilizer which is prepared from the following raw materials in parts by weight:
urea: ammonium phosphate: ammonium bicarbonate: monoammonium phosphate: potassium sulfate: humic acid/biochemical sludge/weathered coal/fermented and decomposed livestock and poultry manure/sugar residue/vinasse/soybean meal: unite bran/rice bran/wheat bran/plant ash/straw: the mass ratio of the amino acid is 650-720: 60-250: 0-480:580-680:600-650:600-800:30-80.
Wherein weathered coal and unite bran are taken as corresponding additives in the organic fertilizer, 5 groups of organic-inorganic compound fertilizer formulas shown in table 2 are obtained.
TABLE 2
The raw materials of 10 groups of organic-inorganic compound fertilizers in table 2 were produced according to the production method in embodiment 4, wherein in formulas 1-5, urea phosphate solutions in groups 1-5 were respectively used as liquid phase solutions for granulation reaction during granulation, and in comparative examples 1-5, tap water was used as the liquid phase solution for granulation, and the particle strength of the obtained 10 groups of organic-inorganic compound fertilizers is shown in table 3: (particle hardness test method of measuring hardness of Fertilizer particles in reference example 4)
TABLE 3
As can be seen from table 3, the organic-inorganic compound fertilizer is produced by using the same raw material formula and the same process flow, and only the liquid phase solution in the granulation process is replaced, so that it is obvious that when the urea phosphate solution provided by the method is used as the liquid phase solution of the granulator for production, the particle strength of the obtained organic-inorganic compound fertilizer is obviously higher, and the particle hardness of the organic-inorganic compound fertilizer produced by the method after being placed for two weeks is more obviously increased than that of the organic-inorganic compound fertilizer produced by the prior art.
Meanwhile, the raw material preparation of the organic-inorganic compound fertilizer has wider application range compared with the compound fertilizer in the prior art, the use of weathered coal and unite bran can effectively reduce the adding cost of the organic fertilizer, and meanwhile, the weathered coal also has certain viscosity, can assist the mutual bonding capacity of the raw materials in the granulation process, improve the product quality of the organic-inorganic compound fertilizer, has longer storage time and more lasting fertilizer effect, and increases the fertilizer effect release time of the organic-inorganic compound fertilizer in the fertilization process.
The organic-inorganic compound fertilizer produced by the organic-inorganic compound fertilizer formula and the production process has higher hardness of fertilizer particles, so that the agglomeration capacity in the fertilizer particles is stronger, and further, the volatilization resistance of the organic-inorganic compound fertilizer particles is stronger, and the storage time is longer.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A preparation method of a high-strength compound fertilizer is characterized by comprising the following steps: the method comprises the following steps:
A. weighing the raw material components according to the preset raw material proportion of the compound fertilizer;
B. b, putting the raw material components weighed in the step A into a granulator to obtain a prefabricated compound fertilizer;
C. screening the prefabricated compound fertilizer obtained in the step B to obtain a primary compound fertilizer with consistent particle size;
D. c, cooling the preliminary compound fertilizer in the step C to obtain a finished product compound fertilizer;
and B, in the step B, when the granulator works, the liquid-phase solution is urea phosphate solution.
2. The preparation method of the high-strength compound fertilizer as claimed in claim 1, wherein the preparation method comprises the following steps: the preparation method of the urea phosphate solution comprises the following steps:
s1, according to urea: weighing corresponding urea and phosphoric acid according to the molar mass ratio of 0.8-1.5 of phosphoric acid for later use;
s2, putting the phosphoric acid and urea weighed in the step S1 into a constant temperature reactor for reaction, controlling the reaction temperature in the constant temperature reactor to be 60-90 ℃, and controlling the reaction time to be 10-35 min to produce the urea phosphate solution.
3. The preparation method of the high-strength compound fertilizer as claimed in claim 3, wherein the preparation method comprises the following steps: the concentration of phosphoric acid in step S1 is 40% -70%.
4. A high-strength compound fertilizer is characterized in that: contains two or three nutrients of nitrogen, phosphorus and potassium.
5. The high-strength compound fertilizer as claimed in claim 4, wherein: also contains organic matter.
6. The high-strength compound fertilizer as claimed in claim 5, wherein: the nitrogen nutrient in the high-strength compound fertilizer is provided by a nitrogen fertilizer, the potassium nutrient is provided by a potassium fertilizer, the phosphorus nutrient is provided by a phosphate fertilizer, and the organic matter is provided by an organic fertilizer.
7. The high-strength compound fertilizer as claimed in claim 6, wherein:
the potash fertilizer comprises one or two of potassium sulfate and potassium chloride;
the phosphate fertilizer comprises one or two of monoammonium phosphate, calcium magnesium phosphate, superphosphate and diammonium phosphate;
the nitrogen fertilizer comprises one or more of urea, ammonium sulfate, ammonium chloride and ammonium bicarbonate;
the organic fertilizer comprises one or more of humic acid, fermented and decomposed livestock and poultry manure, sugar residue, vinasse, soybean meal, biochemical sludge, weathered coal, unite bran, straw, rice bran, wheat bran, plant ash, grass peat and amino acid.
8. The high-strength compound fertilizer as claimed in claim 4, wherein: the raw materials of the high-strength compound fertilizer comprise ammonium bicarbonate, monoammonium phosphate, urea, ammonium chloride and potassium chloride, and the ammonium bicarbonate: monoammonium phosphate: urea: ammonium chloride: the mass ratio of the potassium chloride is 0.8-1.1:5.5-6.5:0.9-1.2:6.5-7.5: 4.8-5.3.
9. The high-strength compound fertilizer as claimed in claim 6, wherein: nitrogenous fertilizer in the raw materials of the high-strength compound fertilizer: phosphate fertilizer: and (3) potassium fertilizer: the mass ratio of the organic fertilizer is 1.5-2.5:0.8-1.3:0.7-1.2: 1.2-1.8.
10. The high-strength compound fertilizer as claimed in claim 9, wherein: urea: ammonium phosphate: ammonium bicarbonate: monoammonium phosphate: potassium sulfate: humic acid/biochemical sludge/weathered coal/fermented and decomposed livestock and poultry manure/sugar residue/vinasse/soybean meal: unite bran/rice bran/wheat bran/plant ash/straw: the mass ratio of the amino acid is 650-720: 60-250: 0-480:580-680:600-650:600-800:30-80.
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| US4554004A (en) * | 1983-10-19 | 1985-11-19 | J. R. Simplot Company | Process for granulation of fertilizer materials |
| CN101445400A (en) * | 2007-11-26 | 2009-06-03 | 南京理工大学 | Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate |
| CN101429072A (en) * | 2008-12-17 | 2009-05-13 | 中国农业科学院农业资源与农业区划研究所 | Humic acid composite slow release fertilizer and producing method thereof |
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Application publication date: 20200407 |