CN114133282A - Preparation method of efficient magnesium polyphosphate fertilizer - Google Patents
Preparation method of efficient magnesium polyphosphate fertilizer Download PDFInfo
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- CN114133282A CN114133282A CN202111390879.1A CN202111390879A CN114133282A CN 114133282 A CN114133282 A CN 114133282A CN 202111390879 A CN202111390879 A CN 202111390879A CN 114133282 A CN114133282 A CN 114133282A
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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
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/10—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using orthophosphoric acid
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
Abstract
The invention belongs to the field of fertilizers, and particularly discloses a preparation method of a high-efficiency magnesium polyphosphate fertilizer, which comprises the following steps: (1) adding wet-process phosphoric acid serving as a raw material into a reduced pressure distillation device for distillation; (2) polymerizing the distilled phosphoric acid solution with phosphorus pentoxide; (3) mixing the material treated in the step (2) with magnesium-containing compound powder and adjusting the pH value; (4) adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer. The invention adopts wet-process phosphoric acid to produce the magnesium polyphosphate fertilizer and adopts the phosphorus accumulation technology to improve the phosphorus effectiveness by more than one time, and the fertilizer has stable quality and good controlled release performance. Polyphosphoric acid in the fertilizer has chelating capacity for metal ions, and can form a soluble complex with ineffective trace elements in soil to be absorbed by plants; meanwhile, the chelation of the polyphosphate can prevent the metal impurities in the suspended fertilizer from forming precipitates, so that the high-concentration suspended fertilizer can be obtained by adding the polyphosphate.
Description
Technical Field
The invention belongs to the technical field of fertilizer production, and particularly relates to a preparation method of a high-efficiency magnesium polyphosphate fertilizer.
Background
The fertilizer is a substance which provides nutrient elements necessary for plants, can improve the soil property and the soil fertility level, is one of the material bases of agricultural production, and mainly comprises a macroelement water-soluble fertilizer, a secondary element fertilizer, a trace element fertilizer, a biological fertilizer, an organic fertilizer and the like.
Phosphorus is a large amount of nutrient elements necessary for the growth and development of plants, the influence of the phosphorus is second to nitrogen and potassium, and the phosphorus in soil cannot meet the requirement of crop yield, so that the application of phosphorus is one of the main effective ways for increasing the yield; phosphate fertilizer applied to soil is easy to react with calcium, iron, aluminum and other ions in soil solution to generate phosphate which is fixed in the soil, so that the current utilization rate of the phosphate fertilizer by crops is generally only 8-21% for a long time.
Magnesium is a medium nutrient element necessary for plant growth and development and is an important component of plant chlorophyll. In the prior art, no report is provided about the content of water-soluble phosphorus and magnesium in a magnesium polyphosphate fertilizer product, and particularly a production method of a high-efficiency magnesium polyphosphate fertilizer with stable quality and high utilization rate is not reported.
Disclosure of Invention
The invention aims to provide a preparation method of a high-efficiency magnesium polyphosphate fertilizer, so as to overcome the defects of unstable quality, low utilization rate and poor fertilizer efficiency of the existing magnesium-containing fertilizer.
In order to realize the aim, the invention provides a preparation method of a high-efficiency magnesium polyphosphate fertilizer, which comprises the following steps:
(1) adding wet-process phosphoric acid serving as a raw material into a reduced pressure distillation device, heating to 300 +/-10 ℃, and carrying out reduced pressure distillation for 2-2.5 h under the conditions that the vacuum degree is 0.0-0.085MPa and the stirring speed is 300 +/-10 rpm;
(2) placing the distilled phosphoric acid solution into a polymerization reaction kettle which can control the reaction temperature and is provided with an electric stirrer, adding phosphorus pentoxide under the conditions that the temperature is 120-160 ℃ and the stirring speed is 510rpm +/-20 rpm, polymerizing for 5-6 h, cooling the reaction product to normal temperature, and controlling the pH value of the material to be 1.5-3.0;
(3) adding the material treated in the step (2) into another reaction kettle, then adding basic magnesium-containing compound powder for mixing, stirring and mixing under normal temperature and normal pressure for reaction, and obtaining the stoichiometric molar ratio of the mixed materialIs Mg: PO (PO)40.7-1.0: 1.0, controlling the pH value of the mixed materials to be between 6.0 and 7.0;
(4) finally adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer.
The high-efficiency magnesium polyphosphate fertilizer prepared by the method has the phosphorus content of P2O546.0% in terms of MgO and 7.7% in terms of magnesium content (polymerization rate 50%, mainly 2-4 polymerization).
The high-efficiency magnesium polyphosphate fertilizer has the main advantages that: 1. polyphosphoric acid has chelating capacity for metal ions, so that the polyphosphoric acid is not easily fixed by metal ions such as iron, calcium and the like in soil, and the mobility can be improved; but also can form a soluble complex with ineffective trace elements in the soil to be absorbed by plants; 2. the chelation of the polyphosphate can prevent the metal impurities in the suspended fertilizer from forming precipitates, so that the high-concentration suspended fertilizer can be obtained by adding the polyphosphate; 3. the polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in the soil to be utilized by the plants, so the polyphosphoric acid is a slow-dissolving long-acting fertilizer. The polyphosphoric acid fertilizer is used, the short-chain part is hydrolyzed into orthophosphate radicals for 2-7 days to be absorbed by crops, the longer the polymerization degree of the long-chain part is, the longer the hydrolysis time is, and the phosphorus polymerization for the fertilizer is generally selected to be controllable, and the polymerization degree of the phosphorus polymerization for 7-60 days is hydrolyzed. The controllable polymerization degree has better controlled release performance. The phosphorus-gathering technology is adopted, so that the phosphorus effectiveness is improved by more than one time, and the phosphorus utilization rate reaches 70-80 percent when the phosphorus-gathering agent is properly used.
Preferably, in the step (1), the wet-process phosphoric acid contains 32-45% of phosphorus pentoxide and has a pH value of 1.5-3.0.
Preferably, in the step (1), the temperature of the vacuum distillation apparatus is increased at a rate of 6 ℃/min.
Preferably, in the step (2), the addition amount of the phosphorus pentoxide is 20-40% of the volume of the raw material acid. The addition of a proper amount of phosphorus pentoxide can improve the concentration and polymerization degree of phosphoric acid.
Preferably, in the step (3), the mixing time is 30 to 60 minutes.
Preferably, in the step (3), the basic magnesium-containing compound is at least one of magnesium hydroxide, magnesium carbonate and magnesium oxide.
Preferably, in the step (4), the amount of the bis-diethylaminoethanol succinate citrate added is 1 kg per ton.
Preferably, in the step (4), the water content of the high-efficiency magnesium polyphosphate fertilizer is lower than 4%.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts wet-process phosphoric acid to produce the high-efficiency magnesium polyphosphate fertilizer and adopts a phosphorus accumulation technology to improve the phosphorus effectiveness by more than one time. Polyphosphoric acid in the fertilizer has chelating capacity for metal ions, so that the polyphosphoric acid is not easily fixed by metal ions such as iron, calcium and the like in soil, and the mobility can be improved; but also can form a soluble complex with ineffective trace elements in the soil to be absorbed by plants; meanwhile, the chelation of the polyphosphate can prevent the metal impurities in the suspended fertilizer from forming precipitates, so that the high-concentration suspended fertilizer can be obtained by adding the polyphosphate; in addition, the polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in soil to be utilized by the plants, so that the polyphosphoric acid is a slow-dissolving long-acting fertilizer.
2. The phosphorus-accumulating technology is adopted in the invention, so that the phosphorus effectiveness is improved by more than one time, and the phosphorus utilization rate reaches 70-80 percent when the phosphorus-accumulating technology is properly used; meanwhile, the succinic acid bis-diethylaminoethanol ester citrate is added, so that the fertilizer efficiency is enhanced.
3. The phosphorus content of the high-efficiency polyphosphoric acid fertilizer produced by the method is P2O546.0 percent of the total amount of the fertilizer, 7.7 percent of magnesium (the polymerization rate is 50 percent, and the polymerization rate is 2-4 percent) calculated by MgO, and the fertilizer has stable quality and good controlled release performance.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to examples, which are not intended to limit the scope of the present invention.
Example 1
The preparation method for producing the high-efficiency magnesium polyphosphate fertilizer by utilizing the wet-process phosphoric acid comprises the following steps:
(1) adding wet phosphoric acid as raw material into a reduced pressure distillation device, heating to 300 + -10 deg.C at a speed of 6 deg.C/min, keeping constant temperature, and distilling under reduced pressure for 2h under the conditions of vacuum degree of 0.0-0.025MPa and stirring speed of 300 + -10 rpm to remove water. Wherein the content of phosphorus pentoxide in the wet-process phosphoric acid raw material is 45%, and the pH value is 1.5.
(2) And (3) putting the distilled phosphoric acid solution into a polymerization reaction kettle which can control the reaction temperature and is provided with an electric stirrer, adding phosphorus pentoxide for polymerization for 5 hours under the conditions that the temperature is 120-130 ℃ and the stirring speed is 510rpm +/-20 rpm, and cooling the reaction finished product to normal temperature to obtain polyphosphoric acid, wherein the pH value of the material is 2.0. The addition amount of the phosphorus pentoxide is 20% of the volume of the raw material acid.
(3) Adding the material treated in the step (2) into another reaction kettle, then adding basic magnesium-containing compound powder, mixing for 60 minutes, stirring and mixing at normal temperature and normal pressure for reaction, wherein the stoichiometric molar ratio of the mixed material is MgO: p2O50.7: 1.0, controlling the pH value of the mixed materials to be 6.0-6.5; the basic magnesium-containing compound is magnesium carbonate. Of course, magnesium hydroxide, magnesium carbonate or the like may be used instead.
(4) Finally adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer. The addition amount of the succinic acid bis-diethylaminoethanol ester citrate is 1 kg per ton. The phosphorus content of the prepared high-efficiency magnesium polyphosphate fertilizer is P2O545.0% by weight, and 7.7% by weight of MgO as magnesium (the polymerization rate is 50%, mainly 2-4 polymerization); the water content is less than 4%.
Comparative example 1
Comparative example 1 Potassium dihydrogen phosphate was produced by a conventional method.
Application test 1
The high-efficiency magnesium polyphosphate fertilizer produced in example 1 and the monopotassium phosphate produced in comparative example 1 were used for planting water spinach and mustard, respectively. Namely, the cultivation was carried out according to the conventional method, and the fertilizers produced in example 1 and comparative example 1 were used for fertilization, respectively. As can be seen from the comparison of the data in Table 1, the content of phosphorus (P) in the root system of water spinach using the high-efficiency magnesium polyphosphate fertilizer is 0.42% and the content of phosphorus (P) in the root system of water spinach using monopotassium phosphate is 0.25% in comparison with that of potassium dihydrogen phosphate having an equal phosphorus content. The magnesium (Mg) content of the water spinach leaves of the high-efficiency magnesium polyphosphate fertilizer is 4256Mg/kg, and the magnesium (Mg) content of the water spinach leaves produced by the conventional method is 3034 Mg/kg; the yield of the high-efficiency polymagnesium phosphate swamp cabbages produced in the example 1 is 3411 kg/mu, which is increased by 1194 kg/mu and 53.8 percent compared with the yield of 2219 kg/mu of monopotassium phosphate swamp cabbages. Compared with potassium dihydrogen phosphate with equal phosphorus amount, the content of phosphorus (P) in the root system of mustard applying the high-efficiency magnesium polyphosphate fertilizer is 0.39%, and the content of phosphorus (P) in the root system of vegetables applying potassium dihydrogen phosphate is 0.30%. The magnesium (Mg) content of the mustard leaves of the high-efficiency magnesium polyphosphate fertilizer is 4135Mg/kg, and the magnesium (Mg) content of the potassium dihydrogen phosphate mustard leaves produced by the conventional method is 3103 Mg/kg; the yield of the magnesium polyphosphate leaf mustard produced in the example 1 is increased by 3774 kg/mu and 1527 kg and is increased by 67.9 percent compared with the yield of the potassium dihydrogen phosphate leaf mustard which is 2247 kg/mu. The high-efficiency magnesium polyphosphate fertilizer produced by the method has high-efficiency effect.
TABLE 1 comparison of the effectiveness of the high-performance magnesium polyphosphate fertilizer produced by the process with the monopotassium phosphate of comparative example 1
Example 2
The preparation method for producing the high-efficiency magnesium polyphosphate fertilizer by utilizing the wet-process phosphoric acid comprises the following steps:
(1) adding wet-process phosphoric acid serving as a raw material into a reduced pressure distillation device, heating to 300 +/-10 ℃ at the speed of 6 ℃/min, keeping the temperature constant, and distilling under reduced pressure for 2.5h under the conditions that the vacuum degree is 0.03-0.085MPa and the stirring speed is 300 +/-10 rpm, so as to remove water. Wherein, the content of the phosphorus pentoxide in the wet-process phosphoric acid raw material is 40%, and the pH value is 2.
(2) And (3) putting the distilled phosphoric acid solution into a polymerization reaction kettle which can control the reaction temperature and is provided with an electric stirrer, adding phosphorus pentoxide for polymerization for 5-6 h under the conditions that the temperature is 140-. The addition amount of the phosphorus pentoxide is 40% of the volume of the raw material acid.
(3) Adding the material treated in the step (2) into another reaction kettle, then adding basic magnesium-containing compound powder, mixing for 60 minutes, stirring and mixing at normal temperature and normal pressure for reaction, wherein the stoichiometric molar ratio of the mixed material is MgO: p2O51.0: 1.0, controlling the pH value of the mixed materials to be 6.5-7.0; the alkaline magnesium-containing compound is magnesium hydroxide.
(4) Finally adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer. The addition amount of the succinic acid bis-diethylaminoethanol ester citrate is 1 kg per ton. The phosphorus content of the prepared high-efficiency magnesium polyphosphate fertilizer is P2O546.0 percent of the total weight of the alloy, and 7.7 percent of magnesium (the polymerization rate is 50 percent, and the polymerization rate is mainly 2 to 4 percent) calculated by MgO; the water content is less than 4%.
Comparative example 2
Comparative example 2 also employed wet phosphoric acid to produce a magnesium polyphosphate fertilizer, differing in that: directly concentrating wet-process phosphoric acid to obtain polyphosphoric acid, and mixing the polyphosphoric acid with alkaline magnesium-containing compound powder according to the mol ratio of Mg: PO (PO)41.0: 1.0, adding the mixture into a reaction kettle for reaction, adding a reduced pressure distillation device for evaporating water until the water content is less than 4 percent, and obtaining the poly-magnesium phosphate (the polymerization rate is 40 percent, and 2 polymerization is taken as the main component).
Comparative experiment 2
The high-efficiency magnesium polyphosphate produced in example 2 and the magnesium polyphosphate produced in comparative example 2 were used for cultivation of water spinach and mustard, respectively. Namely, the cultivation was carried out according to the conventional method, and the fertilizers produced in example 1 and comparative example 1 were used for fertilization, respectively. As can be seen by comparing the data in Table 2, the phosphorus (P) content of the root system of water spinach planted in high-efficiency form was 0.39%, and the phosphorus (P) content of the root system of water spinach planted in high-efficiency form was 0.27%. The magnesium (Mg) content of the swamp cabbage leaves applied with the high-efficiency magnesium polyphosphate fertilizer is 4314Mg/kg, and the magnesium (Mg) content of the swamp cabbage leaves applied with the comparative example 2 is 3212 Mg/kg; the yield of the high-efficiency magnesium polyphosphate water spinach produced in example 2 is 3512 kilograms/acre, which is increased by 904 kilograms/acre and 34.4 percent compared with the yield of 2634 kilograms/acre of the high-efficiency magnesium polyphosphate water spinach produced in comparative example 2. The content of phosphorus (P) in the root system of the mustard with the high-efficiency magnesium polyphosphate is 0.42 percent, and the content of phosphorus (P) in the root system of the vegetable with the high-efficiency magnesium polyphosphate is 0.31 percent. The content of magnesium (Mg) in the leaf of the mustard to which the high-efficiency magnesium polyphosphate is applied is 4205Mg/kg, and the content of magnesium (Mg) in the leaf of the mustard to which the magnesium polyphosphate is applied is 3301 Mg/kg; the yield of the high-efficiency magnesium polyphosphate mustard is 3791 kg/mu, which is increased by 1187 kg and 45.6 percent compared with the yield of 2604 kg/mu. The high-efficiency magnesium polyphosphate fertilizer produced by the method has high-efficiency effect.
TABLE 2 comparison of the effects of the high-efficiency magnesium polyphosphate produced by the method and the comparative magnesium polyphosphate
Example 3
The preparation method for producing the high-efficiency magnesium polyphosphate fertilizer by utilizing the wet-process phosphoric acid comprises the following steps:
(1) adding wet-process phosphoric acid serving as a raw material into a reduced pressure distillation device, heating to 300 +/-10 ℃ at the speed of 6 ℃/min, keeping the temperature constant, and distilling under reduced pressure for 2.5h under the conditions that the vacuum degree is 0.0-0.015MPa and the stirring speed is 300 +/-10 rpm, so as to remove water. Wherein the content of phosphorus pentoxide in the wet-process phosphoric acid raw material is 45%, and the pH value is 1.5.
(2) And (3) putting the distilled phosphoric acid solution into a polymerization reaction kettle which can control the reaction temperature and is provided with an electric stirrer, adding phosphorus pentoxide for polymerization for 5-6 h under the conditions that the temperature is 130-140 ℃ and the stirring speed is 510rpm +/-20 rpm, cooling the reaction product to the normal temperature, and controlling the pH value of the material to be 1.5-3.0. The addition amount of the phosphorus pentoxide is 35% of the volume of the raw material acid.
(3) Adding the material treated in the step (2) into another reaction kettle, then adding basic magnesium-containing compound powder, mixing for 50 minutes, stirring and mixing at normal temperature and normal pressure for reaction, wherein the stoichiometric molar ratio of the mixed material is MgO: p2O50.8-1.0: 1.0, controlling the pH value of the mixed materials to be between 6.0 and 7.0; the basic magnesium-containing compound is magnesium oxide.
(4) Finally adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer. The addition amount of the succinic acid bis-diethylaminoethanol ester citrate is 1 kg per ton. The phosphorus content of the prepared high-efficiency magnesium polyphosphate fertilizer is P2O546.0 percent of the total weight of the alloy, and 7.7 percent of magnesium (the polymerization rate is 50 percent, and the polymerization rate is mainly 2 to 4 percent) calculated by MgO; the water content is less than 4%.
Comparative example 3
Comparative example 3 was prepared similarly to comparative example 2, except that: adding urea into the mixture obtained in the step (4) to prepare a fertilizer.
The high-efficiency magnesium polyphosphate fertilizer produced in example 3 and the magnesium polyphosphate fertilizer produced in comparative example 3 were used for planting water spinach and mustard, respectively. Namely, the cultivation was carried out according to the conventional method, and the fertilizers produced in example 3 and comparative example 3 were used for fertilization, respectively. As can be seen by comparison of the data in Table 3, the root system of water spinach applied with the magnesium polyphosphate fertilizer had a phosphorus (P) content of 0.41%, and the root system of water spinach produced in application example 3 had a phosphorus (P) content of 0.26%. The magnesium (Mg) content of the swamp cabbage leaves to which the high-efficiency magnesium polyphosphate fertilizer is applied is 4304Mg/kg, and the magnesium (Mg) content of the swamp cabbage leaves produced in comparative example 3 is 3207 Mg/kg; the yield of the high-efficiency water spinach of magnesium polyphosphate is 3605 kilograms/mu, which is increased by 925 kilograms/mu and 34.5 percent compared with the yield of the water spinach of comparative example 3. The content of phosphorus (P) in the root system of the mustard after the high-efficiency magnesium polyphosphate fertilizer is applied is 0.44 percent, and the content of phosphorus (P) in the root system of the vegetables after the magnesium polyphosphate fertilizer is applied in comparative example 3 is 0.32 percent. The magnesium (Mg) content of the leaf of the mustard to which the high-efficiency magnesium polyphosphate fertilizer is applied is 4039Mg/kg, and the magnesium (Mg) content of the leaf of the mustard to which the high-efficiency magnesium polyphosphate fertilizer is applied is 3312 Mg/kg; the yield of the high-efficiency magnesium polyphosphate mustard is 3847 kilograms per mu, which is increased by 1034 kilograms per mu and 36.7 percent compared with the yield of 2813 kilograms per mu of the high-efficiency magnesium polyphosphate mustard. The high-efficiency magnesium polyphosphate fertilizer produced by the method has high-efficiency effect.
TABLE 3 comparison of the effectiveness of the high-efficiency magnesium polyphosphate fertilizer produced by the present method with the magnesium polyphosphate fertilizer of comparative example 3
In conclusion, the invention adopts wet-process phosphoric acid to produce the high-efficiency magnesium polyphosphate fertilizer and adopts the phosphorus accumulation technology to improve the phosphorus effectiveness by more than one time, and the fertilizer has stable quality and good controlled release performance. Polyphosphoric acid in the fertilizer has chelating capacity for metal ions, and can form a soluble complex with ineffective trace elements in soil to be absorbed by plants; meanwhile, the chelation of the polyphosphate can prevent the metal impurities in the suspended fertilizer from forming precipitates, so that the high-concentration suspended fertilizer can be obtained by adding the polyphosphate; in addition, the polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in soil to be utilized by the plants, so that the polyphosphoric acid is a slow-dissolving long-acting fertilizer.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. The preparation method of the high-efficiency magnesium polyphosphate fertilizer is characterized by comprising the following steps of:
(1) adding wet-process phosphoric acid serving as a raw material into a reduced pressure distillation device, heating to 300 +/-10 ℃, and carrying out reduced pressure distillation for 2-2.5 h under the conditions that the vacuum degree is 0.0-0.085MPa and the stirring speed is 300 +/-10 rpm;
(2) placing the distilled phosphoric acid solution into a polymerization reaction kettle which can control the reaction temperature and is provided with an electric stirrer, adding phosphorus pentoxide under the conditions that the temperature is 120-160 ℃ and the stirring speed is 510rpm +/-20 rpm, polymerizing for 5-6 h, cooling the reaction product to normal temperature, and controlling the pH value of the material to be 1.5-3.0;
(3) adding the material treated in the step (2) into another reaction kettle, then adding basic magnesium-containing compound powder for mixing, stirring and mixing under normal temperature and normal pressure for reaction, wherein the stoichiometric molar ratio of the mixed material is MgO: p2O50.7-1.0: 1.0, controlling the pH value of the mixed materials to be between 6.0 and 7.0;
(4) finally adding the succinic acid bis-diethylaminoethanol ester citrate and mixing uniformly to obtain the required high-efficiency magnesium polyphosphate fertilizer.
2. The preparation method according to claim 1, wherein in the step (1), the wet-process phosphoric acid contains 32-45% of phosphorus pentoxide and has a pH value of 1.5-3.0.
3. The production method according to claim 1, wherein in the step (1), the temperature of the vacuum distillation apparatus is raised at a rate of 6 ℃/min.
4. The method according to claim 1, wherein in the step (2), the phosphorus pentoxide is added in an amount of 20 to 40% by volume based on the volume of the starting acid.
5. The method according to claim 1, wherein in the step (3), the mixing time is 30 to 60 minutes.
6. The method according to claim 1, wherein in the step (3), the basic magnesium-containing compound is at least one of magnesium hydroxide, magnesium carbonate and magnesium oxide.
7. The method according to claim 1, wherein in the step (4), the amount of the bis-diethylaminoethanol succinate citrate added is 1 kg per ton.
8. The preparation method according to claim 1, wherein in the step (4), the water content of the high-efficiency magnesium polyphosphate fertilizer is less than 4%.
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| CN202111390879.1A CN114133282A (en) | 2021-11-23 | 2021-11-23 | Preparation method of efficient magnesium polyphosphate fertilizer |
| NL2031501A NL2031501B1 (en) | 2021-11-23 | 2022-04-05 | Preparation method of high - efficiency magnesium polyphosphate fertilizer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101269805A (en) * | 2008-05-07 | 2008-09-24 | 瓮福（集团）有限责任公司 | Method for producing polyphosphoric acid |
| CN103153916A (en) * | 2010-08-10 | 2013-06-12 | 艾戈泰克创新股份有限公司 | Phosphate fertilizers and methods of using the same |
| CN105481515A (en) * | 2015-12-31 | 2016-04-13 | 王丰登 | Production method of compound fertilizer containing poly-magnesium phosphate |
| CN105906516A (en) * | 2016-05-24 | 2016-08-31 | 苏州科技学院 | Plant growth regulator succinic bis-diethylamino glycolate citrate compound and preparation method thereof |
-
2021
- 2021-11-23 CN CN202111390879.1A patent/CN114133282A/en active Pending
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2022
- 2022-04-05 NL NL2031501A patent/NL2031501B1/en active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101269805A (en) * | 2008-05-07 | 2008-09-24 | 瓮福（集团）有限责任公司 | Method for producing polyphosphoric acid |
| CN103153916A (en) * | 2010-08-10 | 2013-06-12 | 艾戈泰克创新股份有限公司 | Phosphate fertilizers and methods of using the same |
| CN105481515A (en) * | 2015-12-31 | 2016-04-13 | 王丰登 | Production method of compound fertilizer containing poly-magnesium phosphate |
| CN105906516A (en) * | 2016-05-24 | 2016-08-31 | 苏州科技学院 | Plant growth regulator succinic bis-diethylamino glycolate citrate compound and preparation method thereof |
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| NL2031501A (en) | 2023-06-13 |
| NL2031501B1 (en) | 2023-10-10 |
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Application publication date: 20220304 |