CN113248322A - Preparation method of soluble medium-trace element fertilizer - Google Patents
Preparation method of soluble medium-trace element fertilizer Download PDFInfo
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- CN113248322A CN113248322A CN202110572015.5A CN202110572015A CN113248322A CN 113248322 A CN113248322 A CN 113248322A CN 202110572015 A CN202110572015 A CN 202110572015A CN 113248322 A CN113248322 A CN 113248322A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B15/00—Organic phosphatic fertilisers
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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Abstract
The invention provides a preparation method of a soluble medium-trace element fertilizer, which comprises the following steps: heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry; the optional additives include potassium-containing compounds and/or metal element additives; B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer. The neutral fertilizer is suitable for most of soils, can 100 percent utilize various medium and trace elements in the urea phosphate mother liquor, and can be added with inorganic medium and trace element compounds to obtain polyphosphoric acid chelate to replace EDTA type medium and trace elements in the preparation process. The product of the invention keeps good water solubility in neutral environment, the polymerization rate is up to more than 90%, and the phosphorus occupation ratio of the polymerization form is up to more than 40%; while having an average degree of polymerization of 4 to 15.
Description
Technical Field
The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a preparation method of a soluble medium-trace element fertilizer.
Background
Urea phosphate, also known as urea phosphate or urea phosphate, is a double salt of phosphoric acid with an amino structure, and belongs to fine chemical products. The application of the urea phosphate designs the fields of animal husbandry, industry, agriculture and the like.
The urea phosphate mother liquor is the mother liquor remained after phosphoric acid and urea are crystallized and separated to prepare a urea phosphate product after reaction. Wherein P is2O5The mass percent content of N is 21-30%, and the mass percent content of N is 7-11%; it contains more Ca, Mg, Fe, SO4 and other secondary elements and Fe and other trace elements.
The urea phosphate mother liquor is a byproduct for producing urea phosphate, and has a large amount of metal ions and is difficult to treat; influencing the crystallization of the urea phosphate during the recycling process. Generally, the waste water is recovered by removing impurities, but the method has the problems of low recovery rate, large amount of waste water generation, high treatment cost and the like.
In patent CN 107652038, a method for preparing urea thiophosphate fertilizer using urea, ammonium sulfate or ammonium bisulfate with urea mother liquor of urea phosphate is mentioned, wherein phosphoric acid: urea: ammonium sulfate and/or ammonium bisulfate ═ 1: (0.2-1.4): (1-2). And simultaneously, selectively adding trace elements into the raw material composition, wherein the raw material form of the trace elements is inorganic sulfate (such as zinc sulfate, copper sulfate, ferrous sulfate and the like) or water-soluble EDTA chelated trace elements (such as EDTA-Cu, EDTA-Fe and EDTA-Zn), introducing ammonia gas or sulfuric acid and ammonia gas into the system, adjusting the nitrogen and sulfur content and the pH value in the system, and then drying at low temperature to obtain the urea thiophosphate fertilizer. The method has the defects that the method is only a simple process of mixing and drying materials and also needs to add NH3The pH value of the system is adjusted, so that impurity ions in acid and trace elements with poor water solubility still exist in the form of insoluble substances in a finished product, and the use of the water-soluble fertilizer and the liquid fertilizer in the field is severely limited. If the EDTA chelated trace elements with good water solubility are added, the water solubility of the product can be improved to a certain extent, but the general cognition of the industry is that the EDTA belongs to macromolecules and difficultly degraded substances, particularly the EDTA belongs to bacteriostatic agents, and the biodegradation difficulty is higher. On the one hand, the fertilizer is used in soil because the fertilizer can be absorbed by cropsThe trace elements chelated by the EDTA are difficult to degrade and cannot be absorbed by crops naturally, so that the micromolecules degraded by the sub-substances or macromolecules are not called to be effective; on the other hand, the EDTA type fertilizer which cannot be degraded in the early stage of the soil can cause the enrichment of Na and trace elements to a certain extent, and soil hardening lesion.
Ca, Mg, SO contained in urea phosphate mother liquor4The medium elements and the trace elements such as Fe are necessary for crops, and the medium elements and the trace elements are prepared into the water-soluble fertilizer which can be directly absorbed by the crops in the best method for developing and utilizing the fertilizer to the maximum extent and improving the value.
Disclosure of Invention
The invention aims to provide a preparation method of a soluble medium-trace element fertilizer, which can utilize various medium-trace elements in urea phosphate mother liquor 100% and has slow release performance.
The invention provides a preparation method of a soluble medium-trace element fertilizer, which comprises the following steps:
A) heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry;
the optional additives include potassium-containing compounds and/or metal element additives;
B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer.
Preferably, the phosphorus-containing compound in step a) is phosphoric acid and/or a phosphate; in the mixed slurry, N: p2O5The molar ratio is 1 (1.5-4).
Preferably, the potassium-containing compound in the step A) is KOH or K2SO4、KCl、KNO3And K2CO3One or more of the above; in the mixed slurry, K: p2O5The molar ratio is 1 (3-8).
Preferably, the content of potassium and/or medium and trace metal elements in the mixed slurry is adjusted by using a potassium-containing compound and/or a metal element additive in the step A).
Preferably, the condensing agent in step B) is urea; the mass of the condensing agent is measured by nitrogen, and the molar ratio of the condensing agent to phosphorus in the mixed slurry is N: p2O5Is (1.8-3.2): 1.
preferably, the polymerization is carried out in NH3Is carried out under the environment, the NH3The environment is such that excess urea is produced by decomposition at the polymerization temperature.
Preferably, the semi-finished product obtained by polymerization is crushed and sieved to obtain a soluble medium-trace element fertilizer product.
The invention provides a preparation method of a soluble medium-trace element fertilizer, which comprises the following steps: heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry; the optional additives include potassium-containing compounds and/or metal element additives; B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer. The invention takes urea phosphate mother liquor as raw material, prepares N, P, K soluble fertilizer with chelated medium trace elements through high-temperature condensation, is neutral fertilizer suitable for most of soil, can 100 percent utilize various medium trace elements in the urea phosphate mother liquor, and can add inorganic medium trace element compound to obtain polyphosphoric acid chelate to replace EDTA type medium trace elements in the preparation process; has the advantages of low price, easy decomposition, water solubility, slow release and the like. The product of the invention keeps good water solubility in neutral environment, the polymerization rate is up to more than 90%, and the phosphorus occupation ratio of the polymerization form is up to more than 40%; while having an average degree of polymerization of 4 to 15.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of the preparation process of the present invention.
Detailed Description
The invention provides a preparation method of a soluble medium-trace element fertilizer, which comprises the following steps:
A) heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry;
the optional additives include potassium-containing compounds and/or metal element additives;
B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer.
The preparation process flow of the invention is shown in figure 1, the invention takes urea phosphate mother liquor as raw material, N, P, K soluble fertilizer with chelated medium trace elements is prepared by high-temperature condensation, various medium trace elements in the urea phosphate mother liquor can be utilized by 100%, and the urea phosphate mother liquor also has slow release performance.
In the present invention, the urea phosphate mother liquor and wet process phosphoric acid have the compositions shown in Table 1,
TABLE 1 index of ingredients of main raw materials
Phosphoric acid, an optional metal element additive and an optional potassium-containing compound are added into urea phosphate mother liquor, and the mixture is fully and uniformly mixed to obtain mixed slurry.
The phosphoric acid is added to reduce the nitrogen-phosphorus ratio in the urea phosphate mother liquor, increase the content of free acid and improve the fluidity of the slurry, so that the components are mixed more fully and uniformly. The dosage of the wet-process phosphoric acid is used for controlling the N: p2O5In a molar ratio of 1: (1.5-4), preferably 1: (1.8-3.2), more preferably 1: (2.2-2.6). Metal elementThe addition amount of the element additive is selected to add the metal element additive according to the actual requirement of the final product to adjust the content of the medium trace elements in the mixed slurry. In the present invention, the phosphoric acid may be wet-process phosphoric acid having the composition as in table 1.
The potassium-containing compound is added for more comprehensive fertilizer nutrients, and the potassium-containing compound is preferably KOH and K2SO4、KCl、KNO3And K2CO3One or more of the above; in the mixed slurry, K: p2O5The molar ratio is 1 (3-8), preferably 1: (5-7).
The temperature of slurry mixing is 70-80 ℃.
Then, the mixed slurry is conveyed to a reactor, and simultaneously, a condensing agent urea is added to carry out polymerization reaction under the high-temperature condition. And controlling the polymerization temperature at 160-250 ℃, basically decomposing amide nitrogen generated by excessive urea at the temperature, providing ammonia partial pressure by ammonium nitrogen generated by decomposition, and neutralizing the slurry to raise the pH value of the slurry.
In the invention, the urea is added in excess relative to the content of phosphorus in the mixed slurry C, which is expressed as P2O5And calculating the molar ratio of the mass of the urea to the phosphorus in the mixed slurry, wherein the mass is calculated by nitrogen, and N: p2O5Is (1.8-3.2): 1, more preferably (2-3): 1.
in the present invention, the polymerization temperature is preferably 160 to 250 ℃, more preferably 180 to 220 ℃, such as 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃ and 250 ℃, and preferably any of the above values is used as an upper limit or a lower limit. The polymerization time is preferably 1.5 to 3 hours, and more preferably 2 to 2.5 hours.
And crushing, screening and packaging the semi-finished product obtained by polymerization to obtain the soluble medium and trace element fertilizer product.
The invention provides a preparation method of a soluble medium-trace element fertilizer, which comprises the following steps: A) heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry;
the optional additives include potassium-containing compounds and/or metal element additives;
B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer.
The invention takes urea phosphate mother liquor as raw material, prepares N, P, K soluble fertilizer with chelated medium trace elements through high-temperature condensation, is neutral fertilizer suitable for most of soil, can 100 percent utilize various medium trace element products in the urea phosphate mother liquor and has the advantages of production technology:
(1) the phosphorus content of the polymerization form of the product is up to more than 40 percent, and the polymerization rate is more than 90 percent. The product has good water solubility, mainly shows that the product has certain chelating capacity, can chelate partial insoluble elements in the raw materials into soluble salt, and can chelate a certain amount of inorganic medium and trace elements in the later fertilizer compounding process to replace EDTA (ethylene diamine tetraacetic acid), thereby not only reducing the production cost, but also increasing the soil affinity;
(2) the product has an average degree of polymerization of 4 to 15. After the product is applied to soil, a certain hydrolysis time is provided, the macromolecular polyphosphate in the product is gradually hydrolyzed into small molecules which can be absorbed by plants, the nutrient utilization rate is high, and a certain slow release effect is achieved;
(3) the product has three nutrient elements of NPK, meets the nutrients required by crops in each growth stage, has comprehensive nutrition, and can be independently applied or used together with other fertilizers.
In order to further illustrate the present invention, the following examples are provided to describe the preparation method of a soluble medium trace element fertilizer, but should not be construed as limiting the scope of the present invention.
In the following examples, the amounts of the respective raw materials added are in parts by mass.
Example 1
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 409.11 parts of wet-process phosphoric acid and 43.9 parts of KOH, and uniformly mixing to obtain mixed slurry. Conveying the mixture to a reactor for polymerization, adding 132.1 parts of condensing agent urea into the reactor, controlling the polymerization temperature to 180 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 2 hours, crushing and screening to obtain a finished product. The product indices are shown in Table 3.
Example 2
100 parts of urea phosphate mother liquor is introduced into a mixing tank, 409.11 parts of wet-process phosphoric acid and 43.9 parts of KOH are added and mixed uniformly to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 166.2 parts of condensing agent urea into the reactor, controlling the polymerization temperature to 180 ℃ for reaction, obtaining a semi-finished product after reacting for 2 hours, crushing and screening to obtain a finished product. The product indices are shown in Table 3.
Example 3
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 173.23 parts of wet-process phosphoric acid and 14.6 parts of KOH, and fully and uniformly mixing to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 89.5 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 160 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 2.5 hours, crushing and screening to obtain a finished product.
Example 4
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 173.23 parts of wet-process phosphoric acid and 14.6 parts of KOH, and fully and uniformly mixing to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 115.0 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 220 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 2 hours, crushing and screening to obtain a finished product.
Example 5
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 116.05 parts of wet-process phosphoric acid and 6.9 parts of KOH, and fully and uniformly mixing to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 82.0 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 250 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 1.5 hours, crushing and screening to obtain a finished product.
Example 6
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 116.05 parts of wet-process phosphoric acid 6.9 parts of KOH, and fully and uniformly mixing to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 59.4 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 250 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 3 hours, crushing and screening to obtain a finished product.
Example 7
100 parts of urea phosphate mother liquor is introduced into a mixing tank, 330.49 parts of wet-process phosphoric acid 64.5 parts of KOH is added, and mixed uniformly to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 134.9 parts of condensing agent urea into the reactor, controlling the polymerization temperature to 180 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 3 hours, crushing and screening to obtain a finished product.
Example 8
100 parts of urea phosphate mother liquor is introduced into a mixing tank, 232.20 parts of wet-process phosphoric acid 29.4 parts of K2SO4 are added, and mixed uniformly to obtain mixed slurry. And (3) conveying the mixed slurry to a reactor for polymerization, adding 219.1 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 220 ℃ for reaction, obtaining a semi-finished product after reacting for 2 hours, crushing and screening to obtain a finished product.
Example 9
100 parts of urea phosphate mother liquor is introduced into a mixing tank, 330.49 parts of wet-process phosphoric acid, 54.8 parts of KCl and 8.5 parts of ZnSO4 are added, and mixed uniformly to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 134.9 parts of condensing agent urea into the reactor, controlling the polymerization temperature to 180 ℃ for reaction, obtaining a semi-finished product after reacting for 2 hours, crushing and screening to obtain a finished product.
Example 10
100 parts of urea phosphate mother liquor is introduced into a mixing tank, 232.2 parts of wet-process phosphoric acid, 41.1 parts of KCl and 2.2 parts of FeSO4 are added, and mixed uniformly to obtain mixed slurry. And conveying the mixed slurry to a reactor for polymerization, adding 95.9 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 180 ℃ for reaction, obtaining a semi-finished product after the reaction is carried out for 2 hours, crushing and screening to obtain a finished product.
Table 3 examples 1-10 product nutrient status (%)
Table 4 trace element content (%) -in the products of examples 1 to 10
| Examples | Ca | Mg | Fe | Al | SO4 | Zn |
| 1 | 0.23 | 1.32 | 0.27 | 0.21 | 3.51 | - |
| 2 | 0.22 | 1.28 | 0.26 | 0.20 | 3.39 | - |
| 3 | 0.22 | 1.24 | 0.25 | 0.19 | 3.30 | - |
| 4 | 0.23 | 1.35 | 0.27 | 0.21 | 3.58 | - |
| 5 | 0.27 | 1.54 | 0.31 | 0.24 | 4.10 | - |
| 6 | 0.28 | 1.58 | 0.32 | 0.25 | 4.20 | - |
| 7 | 0.11 | 2.03 | 0.27 | 0.35 | 6.57 | - |
| 8 | 0.13 | 2.15 | 0.29 | 0.35 | 6.80 | - |
| 9 | 0.11 | 1.83 | 0.24 | 0.35 | 5.23 | 0.53 |
| 10 | 0.13 | 2.04 | 1.37 | 0.35 | 5.60 | — |
Comparative example 1
And (3) introducing 100 parts of urea phosphate mother liquor into a mixing tank, adding 187.67 parts of wet-process phosphoric acid and 29.4 parts of KOH, and fully and uniformly mixing to obtain mixed slurry. Conveying the mixed slurry to a reactor for polymerization, adding 219.1 parts of condensing agent urea into the reactor, controlling the polymerization temperature to be 180 ℃ for reaction, obtaining a semi-finished product after reacting for 2 hours, crushing and screening to obtain a finished product; adding 1.9 parts of ZnSO into each 100 parts of the obtained product4And uniformly mixing to obtain the product containing the medium trace element Zn.
Comparative example 2
100 parts of monopotassium phosphate (52.12% P)2O5、24.21％K2O) with 288 parts of monoammonium phosphate (61.02% P)2O5、12.04% N) was added 2.7 parts of ZnSO4To obtain N, P, K fertilizer containing Zn medium elements.
Comparative example 3
100 parts of monopotassium phosphate (52.12% P)2O5、24.21％K2O) and 288 parts of ammonium polyphosphate (58.20% P)2O518.01% N) are mixed uniformly and 1.45 parts of ZnSO are added4To obtain N, P, K fertilizer containing Zn medium elements.
Comparative example 4
100 parts of monopotassium phosphate (52.12% P)2O5、24.21％K2O) and 288 parts of ammonium polyphosphate (58.20% P)2O518.01% N) are mixed uniformly, 2.7 parts of ZnSO are added4To obtain N, P, K fertilizer containing Zn medium elements.
TABLE 5 comparative examples 1 to 4 product nutrient conditions (%)
| Total P2O5 | Total N | K2O | Zn | Rate of polymerization | 3 parts product 100 parts water dissolution | |
| Example 9 | 44.90 | 12.23 | 8.87 | 0.27 | 93.87％ | Completely dissolved, clear and transparent |
| Comparative example 1 | 44.83 | 12.19 | 8.86 | 0.27 | 93.64％ | Turbid milky white color |
| Comparative example 2 | 58.75 | 8.93 | 8.90 | 0.28 | 0％ | Turbid milky white color |
| Comparative example 3 | 56.51 | 13.36 | 8.89 | 0.14 | 60.59％ | Completely dissolved and light milky white |
| Comparative example 4 | 56.50 | 13.35 | 8.81 | 0.28 | 60.36％ | Turbid milky white color |
The following conclusions can be drawn through comparison test examples:
1. example 9 can chelate 0.28% Zn; and dissolves clear and transparent at 3/100.
2. Example 9 was completely dissolved, clear and transparent compared to comparative example 1; indicating that the amount of chelated medium trace elements added before polymerization is greater than the amount of chelated medium trace elements added after polymerization.
3. Example 9 the product is clear and transparent when compared to comparative example 2; illustrating the ability of comparative example 1 to sequester the medium trace element zinc.
4. Example 9 shows that the chelating ability of the novel ammonium potassium polyphosphate is stronger than that of the conventional ammonium polyphosphate, compared with comparative examples 3 and 4.
In addition, the maximum addition amount of the medium trace elements that can be added by the production method of the present application is shown in Table 6,
maximum amount of trace elements added (%)
| Ca | Mg | Fe | Mn | Cu | Zn |
| 2.23 | 3.75 | 2.21 | 1.42 | 0.52 | 1.34 |
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A preparation method of a soluble medium-trace element fertilizer comprises the following steps:
A) heating urea phosphate mother liquor, and mixing with a phosphorus-containing compound and an optional additive to obtain mixed slurry;
the optional additives include potassium-containing compounds and/or metal element additives;
B) and adding a condensing agent into the mixed slurry, and polymerizing for 1.5-3 hours at 160-250 ℃ to obtain the soluble medium and trace element fertilizer.
2. The process according to claim 1, wherein the phosphorus-containing compound in step a) is phosphoric acid and/or a phosphate; in the mixed slurry, N: p2O5The molar ratio is 1 (1.5-4).
3. The method according to claim 1, wherein the potassium-containing compound in step A) is KOH or K2SO4、KCl、KNO3And K2CO3One or more of the above; in the mixed slurry, K: p2O5The molar ratio is 1 (3-8).
4. The method according to claim 1, wherein the content of potassium and/or medium-trace metal elements in the mixed slurry is adjusted by using a potassium-containing compound and/or a metal element additive in step a).
5. The process according to claim 1, wherein the condensing agent in step B) is urea; the mass of the condensing agent is measured by nitrogen, and the molar ratio of the condensing agent to phosphorus in the mixed slurry is N: p2O5Is (1.8-3.2): 1.
6. the method of claim 1, wherein the polymerization is carried out in NH3Is carried out under the environment, the NH3The environment is such that excess urea is produced by decomposition at the polymerization temperature.
7. The preparation method according to any one of claims 1 to 7, wherein the semi-finished product obtained by polymerization is crushed and sieved to obtain a soluble medium and trace element fertilizer product.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718588A (en) * | 2012-05-31 | 2012-10-10 | 深圳市芭田生态工程股份有限公司 | Compound fertilizer produced by tubular reaction and method for preparing compound fertilizer |
| CN104261379A (en) * | 2014-09-19 | 2015-01-07 | 贵阳中化开磷化肥有限公司 | Method for preparing special compound fertilizer for eucalyptus from monopotassium phosphate byproducts |
| CN104692976A (en) * | 2015-03-20 | 2015-06-10 | 路永宽 | Multi-element water-soluble fertilizer |
| CN107652038A (en) * | 2017-10-11 | 2018-02-02 | 金正大生态工程集团股份有限公司 | A kind of method that sulphur urea phosphate fertilizer is produced using urea phosphate mother liquor |
| CN109437981A (en) * | 2018-12-27 | 2019-03-08 | 川恒生态科技有限公司 | Fertilizer triammonium polyphosphate and its production method containing microelement in metal |
| CN109704818A (en) * | 2017-10-25 | 2019-05-03 | 四川大学 | DAP compound fertilizer and preparation method thereof |
| CN110357670A (en) * | 2019-07-04 | 2019-10-22 | 湖北祥云(集团)化工股份有限公司 | A method of compound fertilizer containing ammonium polyphosphate is prepared using industrial monoammonium phosphate slag |
| CN111232946A (en) * | 2020-03-20 | 2020-06-05 | 贵州川恒化工股份有限公司 | Method for preparing ammonium potassium polyphosphate from acid potassium dihydrogen phosphate |
| CN111689805A (en) * | 2020-06-23 | 2020-09-22 | 四川大学 | Production method of compound fertilizer |
-
2021
- 2021-05-25 CN CN202110572015.5A patent/CN113248322B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102718588A (en) * | 2012-05-31 | 2012-10-10 | 深圳市芭田生态工程股份有限公司 | Compound fertilizer produced by tubular reaction and method for preparing compound fertilizer |
| CN104261379A (en) * | 2014-09-19 | 2015-01-07 | 贵阳中化开磷化肥有限公司 | Method for preparing special compound fertilizer for eucalyptus from monopotassium phosphate byproducts |
| CN104692976A (en) * | 2015-03-20 | 2015-06-10 | 路永宽 | Multi-element water-soluble fertilizer |
| CN107652038A (en) * | 2017-10-11 | 2018-02-02 | 金正大生态工程集团股份有限公司 | A kind of method that sulphur urea phosphate fertilizer is produced using urea phosphate mother liquor |
| CN109704818A (en) * | 2017-10-25 | 2019-05-03 | 四川大学 | DAP compound fertilizer and preparation method thereof |
| CN109437981A (en) * | 2018-12-27 | 2019-03-08 | 川恒生态科技有限公司 | Fertilizer triammonium polyphosphate and its production method containing microelement in metal |
| CN110357670A (en) * | 2019-07-04 | 2019-10-22 | 湖北祥云(集团)化工股份有限公司 | A method of compound fertilizer containing ammonium polyphosphate is prepared using industrial monoammonium phosphate slag |
| CN111232946A (en) * | 2020-03-20 | 2020-06-05 | 贵州川恒化工股份有限公司 | Method for preparing ammonium potassium polyphosphate from acid potassium dihydrogen phosphate |
| CN111689805A (en) * | 2020-06-23 | 2020-09-22 | 四川大学 | Production method of compound fertilizer |
Non-Patent Citations (1)
| Title |
|---|
| 韩长日 等: "《精细无机化学品制造技术》", 31 August 2008, 科技文献出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115108853A (en) * | 2022-07-15 | 2022-09-27 | 郑州大学 | High-water-solubility ammonium polyphosphate and synthesis method and application thereof |
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