NL2031501A - Preparation method of high - efficiency magnesium polyphosphate fertilizer - Google Patents

Preparation method of high - efficiency magnesium polyphosphate fertilizer Download PDF

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Publication number
NL2031501A
NL2031501A NL2031501A NL2031501A NL2031501A NL 2031501 A NL2031501 A NL 2031501A NL 2031501 A NL2031501 A NL 2031501A NL 2031501 A NL2031501 A NL 2031501A NL 2031501 A NL2031501 A NL 2031501A
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fertilizer
magnesium
polyphosphate
phosphoric acid
magnesium polyphosphate
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NL2031501A
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NL2031501B1 (en
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Wang Guichuan
Tan Hongwei
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Tan Hongwei
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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
    • 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

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  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Fertilizers (AREA)

Abstract

The invention belongs to the field of fertilizers, and specifically discloses a preparation method of a high - efficiency magnesium polyphosphate fertilizer, which comprises the following steps: (1) adding wet - process phosphoric acid as a raw material into a vacuum distillation device for distillation; (2) polymerizing the distilled phosphoric acid solution with phosphorus pentoxide; (3) mixing the material treated in step (2) with magnesium - containing compound powder and adjusting the pH value; and (4) adding succinic acid diethyl aminoethanol citrate and mixing evenly to obtain the required high - efficiency magnesium polyphosphate fertilizer. The invention uses wet phosphoric acid to produce magnesium polyphosphate fertilizer and adopts polyphosphate technology, which more than doubles the effectiveness of phosphorus, and the fertilizer has stable quality and good controlled release performance. The polyphosphate in the fertilizer has the ability to chelate metal ions and can be absorbed by plants by forming soluble complexes with ineffective trace elements in the soil; at the same time, the chelating effect of the polyphosphate prevents the formation of precipitation of metal impurities in the suspended fertilizer, thus adding polyphosphate can result in a highly concentrated suspended fertilizer

Description

Preparation method of high - efficiency magnesium polyphosphate fertilizer
TECHNICAL FIELD
The invention belongs to the technical field of fertilizer production, and particularly relates toa preparation method of high - efficiency magnesium polyphosphate fertilizer.
BACKGROUND
Fertilizer refers to the substance that provides essential nutrient elements for plants, can improve soil properties and improve soil fertility level, and is one of the material bases of agricultural production. It mainly includes water - soluble fertilizer of large elements, medium element fertilizer, trace element fertilizer, biological fertilizer, organic fertilizer and so on.
Phosphorus is an essential nutrient element for plant growth and development, and its influence is second only to nitrogen and potassium. Phosphorus in soil can't meet the demand of crop yield. Therefore, phosphorus application is one of the main effective ways to increase yield. However, the phosphate fertilizer applied to the soil easily reacts with calcium, iron and aluminum plasma in the soil solution to generate phosphate which is fixed in the soil. Therefore, for a long time, the utilization rate of phosphate fertilizer by crops in the current season is generally only 8 - 21%.
Magnesium is an essential medium nutrient element for plant growth and development, andan important component of plant chlorophyll.
In the prior art, there is no report about water - soluble phosphorus and magnesium in magnesium polyphosphate fertilizer products, especially the production method of high - efficiency magnesium polyphosphate fertilizer with stable quality and high utilization rate.
SUMMARY
The purpose of the invention is to provide a preparation method of efficient magnesium polyphosphate fertilizer, thus overcoming the defects of unstable quality, low utilization rate and poor fertilizer efficiency of existing magnesium - containing fertilizers.
In order to achieve the above purpose, the invention provides a preparation method of high 3 efficiency magnesium polyphosphate fertilizer, which comprises the following steps: (1) adding wet - process phosphoric acid as raw material into a vacuum distillation device, heating to 300 + 10°C, and performing vacuum distillation for 2 hours to 2.5 hours under the conditions of vacuum degree of 0.0 - 0.085 MPa and stirring rate of 300 rpm + 10 rpm; (2) putting the distilled phosphoric acid solution into a polymerization reactor with controllable reaction temperature and an electric stirrer, adding phosphorus pentoxide at a temperature of 120 - 160°C and a stirring rate of 510 rpm plus or minus 20 rpm, and polymerizing for 5 - 6 hours, cooling the product after the reaction to normal temperature, and controlling the pH value of the material to be 1.5 - 3.0;
(3) adding the material treated in step (2) into another reaction kettle, then adding alkaline magnesium - containing compound powder for mixing, and stirring and mixing at normal temperature and pressure, wherein the stoichiometric molar ratio of the mixed material is Mg:
PQs =0.7 - 1.0: 1.0, and the pH value of the mixed material is controlled between 6.0 and 7.0; and (4), adding succinic acid diethyl aminoethanol citrate and uniformly mixing to obtain the required high - efficiency magnesium polyphosphate fertilizer.
The efficient magnesium polyphosphate fertilizer prepared by this method has a phosphorus content of 46.0% in terms of P205 and a magnesium content of 7.7% in terms of
MgO (polymerization rate of 50%).
The main advantages of high - efficiency magnesium polyphosphate fertilizer are as follows: 1. Polyphosphoric acid has chelating ability to metal ions, so it is not easy to be fixed by metal ions such as iron and calcium in soil, which can increase its mobility; on the contrary, polyphosphoric acid can form soluble complexes with ineffective trace elements in soil and be absorbed by plants. 2. Chelation of polyphosphate can prevent metal impurities in suspended fertilizer from forming precipitation, so adding polyphosphate can obtain high concentration suspended fertilizer; 3. Polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in the soil and used by plants, so it is a slow - soluble long - acting fertilizer. With polyphosphoric acid fertilizer, the short - chain part is hydrolyzed into orthophosphate 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. Generally, the controllable polymerization degree of 7 - 60 days is selected for polyphosphoric acid fertilizer. The controllable polymerization degree has better controlled release performance. By adopting the technology of phosphorus accumulation, the effectiveness of phosphorus can be more than doubled, and the utilization rate of phosphorus can reach 70 - 80% if used properly.
Preferably, in step (1), the content of phosphorus pentoxide in the wet - process phosphoric acid is 32% - 45%, and the pH value is 1.5 - 3.0.
Preferably, in step (1), the temperature of the vacuum distillation apparatus is raised at a rate of 6°C/min.
Preferably, in step (2), the added amount of phosphorus pentoxide is 41.4 - 49.2% of the volume of raw acid. The concentration and polymerization degree of phosphoric acid can be increased by adding appropriate amount of phosphorus pentoxide.
Preferably, in step (3), the mixing time is 30 to 60 minutes.
Preferably, in step (3), the alkaline magnesium - containing compound is at least one of magnesium hydroxide, magnesium carbonate and magnesium oxide.
Preferably, in step (4), the added amount of succinic acid bis diethylaminoethanol citrate is 1 kg per ton.
Preferably, in step (4), the water content of the efficient magnesium polyphosphate fertilizer is less than 4%.
Compared with the prior art, the invention has the following beneficial effects: 1. The invention adopts wet - process phosphoric acid to produce high - efficiency magnesium polyphosphate fertilizer, and adopts phosphorus - accumulating technology, so that the effectiveness of phosphorus is more than doubled. Polyphosphoric acid in fertilizer has chelating ability to metal ions, so it is not easy to be fixed by iron, calcium and other metal ions in soil, which can increase its mobility. On the contrary, Polyphosphoric acid can form soluble complexes with ineffective trace elements in soil and be absorbed by plants. At the same time, the chelation of polyphosphate can prevent the precipitation of metal impurities in suspended fertilizer, so adding polyphosphate can obtain high - concentration suspended fertilizer; In addition, polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in the soil and used by plants, so itis a slow - soluble and long - acting fertilizer. 2. In the invention, the phosphorus accumulation technology is adopted, so that the effectiveness of phosphorus is more than doubled, and the phosphorus utilization rate reaches 70-80% when used properly; At the same time, the succinate diethyl aminoethanol citrate is added in the invention, which is beneficial to enhance the fertilizer efficiency. 3. The efficient polyphosphoric acid fertilizer produced by the method of the present invention has a phosphorus content of 46.0% in terms of P2Os and a magnesium content of 7.7% in terms of MgO (polymerization rate of 50%), stable fertilizer quality and good controlled release performance.
DESCRIPTION OF THE INVENTION
Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of the present invention.
The following examples will further explain the invention in detail, but the examples do not |imit the technical scheme of the invention.
Embodiment 1
The preparation method for producing efficient magnesium polyphosphate fertilizer by wet - process phosphoric acid comprises the following steps: (1) adding wet - process phosphoric acid as raw material into a vacuum distillation device, raising the temperature to 300°C + 10°C at the rate of 6°C/min, while keeping the constant temperature, vacuum distillation for 2 hours under the conditions of 0.0 - 0.025 MPa vacuum degree and 300 rpm + 10 rpm stirring rate to remove water. Wherein, the content of phosphorus pentoxide in the raw material of wet - process phosphoric acid is 45%, and the pH value is 1.5. (2) putting the distilled phosphoric acid solution into a polymerization reactor with controllable reaction temperature and electric stirrer, adding phosphorus pentoxide at a temperature of 120 - 130°C and a stirring rate of 510 rpm plus or minus 20 rpm, and polymerize for 5 hours. After the reaction, the product is cooled to normal temperature to obtain polyphosphoric acid, at which time the pH value of the material is 2.0. The added amount of phosphorus pentoxide is 30% of the volume of raw acid. (3) adding the material treated in step (2) into another reaction kettle, then adding alkaline magnesium - containing compound powder to mix for 80 minutes, and stirring and mixing at normal temperature and pressure, wherein the stoichiometric molar ratio of the mixed material is
Mg: POs =0.7 : 1.0, and the pH value of the mixed material is controlled between 6.0 and 6.5;
The alkaline magnesium - containing compound is magnesium carbonate. And the magnesium hydroxide or magnesium carbonate can be used instead.
And (4), adding succinic acid diethyl aminoethanol citrate and uniformly mixing to obtain the required high - efficiency magnesium polyphosphate fertilizer. The addition amount of succinic acid diethyl aminoethanol citrate is 1 kg per ton. The prepared high - efficiency magnesium polyphosphate fertilizer has a phosphorus content of 45.0% in terms of P:O: and a magnesium content of 7.7% in terms of MgO (polymerization rate of 50%). The moisture content is less than 4%.
Comparative embodiment 1
In Comparative embodiment 1, potassium dihydrogen phosphate is produced by conventional method.
Application test 1
The efficient magnesium polyphosphate fertilizer produced in Embodiment 1 and the potassium dihydrogen phosphate produced in Comparative embodiment 1 are used for the planting of Brassica juncea and Ipomoea aquatica respectively. That is, planting is carried out according to the conventional method, and the fertilizers produced in Embodiment 1 and
Comparative embodiment 1 are used for fertilization respectively. From the comparison of data in Table 1, it can be seen that the phosphorus (P) content in the root of Ipomoea aquatica is 0.42% and 0.25% in the root of Ipomoea aquatica with high - efficiency magnesium polyphosphate and potassium dihydrogen phosphate. The magnesium (Mg) content in leaves of
Ipomoea aquatica with high efficiency magnesium polyphosphate fertilizer is 4256 Mg/kg, and that of leaves of Ipomoea aquatica with potassium dihydrogen phosphate produced by conventional method is 3034 mg/kg. The yield of efficient magnesium polyphosphate Brassica juncea produced in Embodiment 1 is 3411 kg/mu, which is 1194 kg higher than that of Brassica juncea with potassium dihydrogen phosphate of 2219 kg/mu, an increase of 53.8%. Compared with potassium dihydrogen phosphate with the same amount of phosphorus, the phosphorus (P) content of Ipomoea aquatica root is 0.39% with magnesium polyphosphate fertilizer and 0.30% with potassium dihydrogen phosphate. The magnesium (Mg) content of /pomoea aquatica leaves of high - efficiency magnesium polyphosphate fertilizer is 4135 Mg/kg, and that 5 of potassium dihydrogen phosphate Ipomoea aquatica leaves produced by conventional method is 3103 mg/kg. The yield of magnesium polyphosphate Ipomoea aquatica produced in
Embodiment 1 is 3774 kg/mu, which is 1527 kg higher than that of potassium dihydrogen phosphate Ipomoea aquatica which is 2247 kg/mu, an increase of 67.9%. The efficient magnesium polyphosphate fertilizer produced by this method has high efficiency.
Phosphorus (P) / / Magnesium (Mg)
Subject of Vegetable output Content in
Fertilizer category content in leaves of application (kg/mu) Vegetable Roots vegetables (mg/kg) (%)
Potassium dihydrogen phosphate yarogen phosp 2219 0.25 3034 produced in Comparative
Brassica / embodiment 1 juncea
Efficient magnesium polyphosphate produced 3411 0.42 4256 in Embodiment 1
Potassium dinydrogen phosphate yerogen PNoSp 2247 0.30 3103 produced in Comparative
Ipomoea embodiment 1 aquatica
Efficient magnesium polyphosphate produced 3774 0.39 4135 in Embodiment 1
Embodiment 2
The preparation method for producing efficient magnesium polyphosphate fertilizer by wet - process phosphoric acid comprises the following steps: (1) adding wet - process phosphoric acid as raw material into a vacuum distillation device, raising the temperature to 300°C + 10°C at a rate of 6°C/min, while keeping the constant temperature, under the conditions of vacuum degree of 0.03 - 0.085 MPa and stirring rate of 300 rpm + 10 rpm, vacuum distillation is carried out for 2.5h hours to remove water. Wherein, the content of phosphorus pentoxide in the raw material of wet - process phosphoric acid is 40%, and the pH value is 2. (2) putting the distilled phosphoric acid solution into a polymerization reactor with a controllable reaction temperature and an electric stirrer, adding phosphorus pentoxide at a temperature of 140 - 160°C and a stirring rate of 510 rpm + 20 rpm, and polymerize for 5 - 6 hours. After the reaction, the product is cooled to normal temperature, and the pH value of the material is controlled to be 1.5 - 3.0. The added amount of phosphorus pentoxide is 40% of the volume of raw acid. (3) adding the material treated in step (2) into another reaction kettle, then adding alkaline magnesium - containing compound powder to mix for 60 minutes, and stirring and mixing at normal temperature and pressure, wherein the stoichiometric molar ratio of the mixed material is
Mg: POs =1.0: 1.0, and the pH value of the mixed material is controlled between 6.5 and 7.0;
The alkaline magnesium - containing compound is magnesium hydroxide. and (4), adding succinic acid diethyl aminoethanol citrate and uniformly mixing to obtain the required high - efficiency magnesium polyphosphate fertilizer. The addition amount of succinic acid diethyl aminoethanol citrate is 1 kg per ton. The prepared high - efficiency magnesium polyphosphate fertilizer has a phosphorus content of 46.0% in terms of P2O: and a magnesium content of 7.7% in terms of MgO (polymerization rate of 50%). The moisture content is less than 4%.
Comparative embodiment 2
Comparative embodiment 2 also uses wet - process phosphoric acid to produce magnesium polyphosphate fertilizer. The difference lies in that: the wet - process phosphoric gacidis directly concentrated to obtain polyphosphoric acid, which is added into a reaction kettle to react with basic magnesium - containing compound powder according to the molar ratio of
Mg: POs =1.0 : 1.0, and then added into a vacuum distillation device to evaporate water until the water content is less than 4%, thus obtaining magnesium polyphosphate (polymerization rate of 40%).
Application test 2
The efficient magnesium polyphosphate produced in Embodiment 2 and the magnesium polyphosphate produced in Comparative embodiment 2 were used for the planting of Brassica juncea and mustard respectively. That is, planting is carried out according to the conventional method, and the fertilizers produced in Embodiment 1 and Comparative embodiment 1 are used for fertilization respectively. From the data comparison in Table 2, it can be seen that the phosphorus (P) content of the root system of Ipomoea aquatica with high efficiency magnesium polyphosphate is 0.39%, and that of /pomoea aquatica with magnesium polyphosphate is 0.27%. The magnesium (Mg) content of the leaves of /pomoea aquatica with high - efficiency magnesium polyphosphate fertilizer is 4314 Mg/kg, and that of /pomoea aquatica with magnesium polyphosphate of Comparative embodiment 2 is 3212 mg/kg. The yield of efficient magnesium polyphosphate Brassica juncea produced in Embodiment 2 is 3512 kg/mu, which is 904 kg higher than that of Comparative embodiment 2, which is 2634 kg/mu, with an increase of 34.4%. The phosphorus (P) content of mustard root with high efficiency magnesium polyphosphate is 0.42%, and that of vegetable root with magnesium polyphosphate is 0.31%.
The magnesium (Mg) content of mustard leaves applied with high - efficiency magnesium polyphosphate is 4205 Mg/kg, and that of mustard leaves applied with magnesium polyphosphate is 3301 mg/kg. The yield of mustard with high efficiency magnesium polyphosphate is 3,791 kg/mu, which is 1,187 kg higher than that with magnesium polyphosphate of 2,604 kg/mu, an increase of 45.6%. The efficient magnesium polyphosphate fertilizer produced by this method has high efficiency.
Phosphorus (P) / / Magnesium (Mg)
Subject of u Vegetable output Content in /
Fertilizer category content in leaves of application (kg/mu} Vegetable Roots vegetables (mg/kg) (%)
Potassium dihydrogen phosphate yerogen phosp 2634 0.27 3212 produced in Comparative
Brassica / embodiment 1 juncea
Efficient magnesium polyphosphate produced 3512 0.39 4314 in Embodiment 1
Potassium dinydrogen phosphate ydrogen phiosp 2604 0.31 3301 produced in Comparative
Ipomoea embodiment 1 aquatica
Efficient magnesium polyphosphate produced 3791 0.42 4205 in Embodiment 1
Embodiment 3
The preparation method for producing high - efficiency magnesium polyphosphate fertilizer by wet - process phosphoric acid comprises the following steps: (1) adding wet - process phosphoric acid as raw material into a vacuum distillation device, raising the temperature to 300°C + 10°C at the rate of 6°C/min, while keeping the constant temperature, vacuum distillation for 2.5 hours under the conditions of 0.0 - 0.015 MPa vacuum degree and 300 rpm + 10 rpm stirring rate to remove water. Wherein, the content of phosphorus pentoxide in the raw material of wet - process phosphoric acid is 45%, and the pH value is 1.5. (2) putting the distilled phosphoric acid solution into a polymerization reactor with a controllable reaction temperature and an electric stirrer, add phosphorus pentoxide at a temperature of 130 - 140°C and a stirring rate of 510 rpm plus or minus 20 rpm, and polymerize for 5 - 6 hours. After the reaction, the product is cooled to normal temperature, and the pH value of the material is controlled to be 1.5 - 3.0. The added amount of phosphorus pentoxide is 35% of the volume of raw acid. (3) adding the material treated in step (2) into another reaction kettle, then adding alkaline magnesium - containing compound powder to mix for 50 minutes, and stirring and mixing at normal temperature and pressure, wherein the stoichiometric molar ratio of the mixed material is
Mg: PO4 = 0.8 - 1.0: 1.0, and the pH value of the mixed material is controlled between 6.0 - 7.0;
The alkaline magnesium - containing compound is magnesium oxide.
And (4), adding succinic acid diethyl aminoethanol citrate and uniformly mixing to obtain the required high - efficiency magnesium polyphosphate fertilizer. The addition amount of succinic acid diethyl aminoethanol citrate is 1kg per ton. The prepared high - efficiency magnesium polyphosphate fertilizer has a phosphorus content of 46.0% in terms of P2O: and a magnesium content of 7.7% in terms of MgO (polymerization rate of 50%). Moisture content less than 4%.
Comparative embodiment 3
The preparation method of Comparative embodiment 3 is similar to that of Comparative embodiment 2, with the difference that urea is added to (4) to make fertilizer.
The efficient magnesium polyphosphate fertilizer produced in Embodiment 3 and the magnesium polyphosphate fertilizer produced in Comparative embodiment 3 were used for the planting of Brassica juncea and mustard respectively. That is, planting is carried out according to the conventional method, and the fertilizers produced in Embodiment 3 and Comparative embodiment 3 are used for fertilization respectively. From the data comparison in Table 3, it can be seen that the phosphorus (P) content of the root system of /pomoea aquatica with magnesium polyphosphate fertilizer is 0.41%, and that of Ipomoea aquatica with magnesium polyphosphate produced in Embodiment 3 is 0.26%. The magnesium (Mg) content of the leaves of Ipomoea aquatica with high - efficiency magnesium polyphosphate fertilizer is 4304 Mg/kg, and that of the leaves of /pomoea aquatica produced in Comparative embodiment 3 is 3207 mg/kg. The yield of Brassica juncea with high efficiency magnesium polyphosphate of 3,605 kg/mu is 925 kg higher than that of Brassica juncea with magnesium polyphosphate of 2,680 kg/mu produced in Comparative embodiment 3, an increase of 34.5%. The phosphorus (P) content in the root of mustard with high - efficiency magnesium polyphosphate fertilizer is 0.44%, and that of the vegetable root with magnesium polyphosphate produced in Comparative embodiment 3 is 0.32%. The magnesium (Mg) content of mustard leaves applied with high - efficiency magnesium polyphosphate fertilizer is 4039 Mg/kg, and that of mustard leaves produced in Comparative embodiment 3 is 3312 mg/kg. The yield of mustard with high efficiency magnesium polyphosphate is 3847 kg/mu, which is 1034 kg higher than that with magnesium polyphosphate of 2813 kg/mu, an increase of 36.7%. The efficient magnesium polyphosphate fertilizer produced by this method has high efficiency.
Table 3 Comparison of the effects between the high - efficiency magnesium polyphosphate fertilizer produced by this method and the magnesium polyphosphate fertilizer of Comparative embodiment 3
Phosphorus (P)
Magnesium (Mg)
Subject of Vegetable output Content in
Fertilizer category content in leaves of application (kg/mu) Vegetable Roots vegetables (mg/kg) (%)
Potassium dihydrogen phosphate ydrogen phosp 2680 0.26 3207 produced in Comparative
Brassica / embodiment 1 juncea
Efficient magnesium polyphosphate produced 3605 0.41 4304 in Embodiment 1
Potassium dihydrogen phosphate yarogen phosp 2813 0.32 3312 produced in Comparative
Ipomoea embodiment 1 aquatica
Efficient magnesium polyphosphate produced 3847 0.44 4039 in Embodiment 1
To sum up, the invention adopts wet - process phosphoric acid to produce efficient magnesium polyphosphate fertilizer, and adopts phosphorus accumulation technology, so that the effectiveness of phosphorus is more than doubled, the fertilizer quality is stable and the controlled release performance is good. Polyphosphoric acid in fertilizer has chelating ability to metal ions, which can form soluble complexes with ineffective trace elements in soil and be absorbed by plants. At the same time, the chelation of polyphosphate can prevent the precipitation of metal impurities in suspended fertilizer, so adding polyphosphate can obtain high - concentration suspended fertilizer; In addition, polyphosphoric acid is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in the soil and used by plants, so it is a slow - soluble and long - acting fertilizer.
The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and illustration. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously, many changes and variations can be made in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so as to enable those skilled in the art to realize and utilize various exemplary embodiments and various choices and changes of the present invention. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims (8)

CONCLUSIESCONCLUSIONS 1. 1. Een werkwijze voor het bereiden van magnesium-polyfosfaat kunstmest met hoog rendement, welke werkwijze omvat: (1) in een vacuümdestillatie apparaat invoeren van fosforzuur uit een nat proces als grondstof, verwarmen tot 300 + 10 ° C, en het uitvoeren van vacuümdestillatie gedurende 2 uur tot 2,5 uur onder de omstandigheden van een vacuümgraad van 0,0 - 0,085 MPa en een roersnelheid van 300 omwentelingen per minuut plus of min 10 omwentelingen per minuut; (2) het in een polymerisatiereactor met een regelbare reactietemperatuur en een elektrische roerder brengen van de gedestilleerde fosforzuuroplossing, toevoegen van fosforpentoxide bij een temperatuur van 120 - 160°C en een roersnelheid van 510 omwentelingen per minuut plus of min 20 omwentelingen per minuut, het gedurende 5 - 6 uur laten polymeriseren, het tot de normale temperatuur afkoelen van het product na de reactie waarbij de pH-waarde van het materiaal op 1,5 - 3,0 wordt gehouden; (3) het in een andere reactieketel toevoegen van het in stap (2) behandelde materiaal, het vervolgens toevoegen van een poedervormige alkalische magnesiumhoudende verbinding om te mengen, het roeren en mengen bij normale temperatuur en druk, waarbij de stoichiometrische molaire verhouding van het gemengde materiaal Mg : PO, =0,7-1,0: 1,0 bedraagt, en de pH-waarde van het gemengde materiaal tussen 6,0 en 7,0 wordt gehouden; en (4) het toevoegen van barnsteenzuurdiëthylaminoëthanolcitraat en het gelijkmatig mengen om de vereiste magnesium-polyfosfaat kunstmest met hoog rendement te verkrijgen.1. 1. A method for preparing high-efficiency magnesium polyphosphate fertilizer, which method includes: (1) feeding phosphoric acid from wet process as raw material into a vacuum distillation apparatus, heating to 300 + 10 °C, and performing of vacuum distillation for 2 hours to 2.5 hours under the conditions of a vacuum degree of 0.0 - 0.085 MPa and a stirring speed of 300 rpm plus or minus 10 rpm; (2) placing the distilled phosphoric acid solution in a polymerization reactor having a controllable reaction temperature and an electric stirrer, adding phosphorus pentoxide at a temperature of 120-160°C and a stirring speed of 510 rpm plus or minus 20 rpm, polymerizing for 5-6 hours, cooling the product to normal temperature after the reaction keeping the pH of the material at 1.5-3.0; (3) adding the material treated in step (2) into another reaction kettle, then adding a powdered alkaline magnesium-containing compound for mixing, stirring and mixing at normal temperature and pressure, the stoichiometric molar ratio of the mixed material Mg : PO, =0.7-1.0 : 1.0, and the pH value of the mixed material is kept between 6.0 and 7.0; and (4) adding succinic acid diethylaminoethanol citrate and mixing uniformly to obtain the required high yield magnesium polyphosphate fertilizer. 2. De bereidingswijze volgens conclusie 1, waarbij in stap (1) het gehalte aan fosforpentoxide in het fosforzuur uit een nat proces 32% - 45% bedraagt, en de pH-waarde 1,5 - 3,0 is.The production method according to claim 1, wherein in step (1), the content of phosphorus pentoxide in the wet process phosphoric acid is 32% - 45%, and the pH value is 1.5 - 3.0. 3. De bereidingswijze volgens conclusie 1, waarbij de temperatuur van het vacuümdestillatie apparaat in stap (1) wordt verhoogd met een snelheid van 6°C/min.The production method according to claim 1, wherein the temperature of the vacuum distillation apparatus in step (1) is increased at a rate of 6°C/min. 4. De bereidingswijze volgens conclusie 1, waarbij de toegevoegde hoeveelheid fosforpentoxide in stap (2) 30 - 40% van het volume van het ruwe zuur bedraagt.The production method according to claim 1, wherein the amount of phosphorus pentoxide added in step (2) is 30-40% of the volume of the crude acid. 5. De bereidingswijze volgens conclusie 1, waarbij de mengtijd in stap (3) 30 tot 60 minuten bedraagt.The preparation method according to claim 1, wherein the mixing time in step (3) is 30 to 60 minutes. 6. De bereidingswijze volgens conclusie 1, waarbij in stap (3) de alkalische magnesium- houdende verbinding ten minste een van magnesiumhydroxide, magnesiumcarbonaat en magnesiumoxide is.The production method according to claim 1, wherein in step (3), the alkaline magnesium-containing compound is at least one of magnesium hydroxide, magnesium carbonate and magnesium oxide. 7. De bereidingswijze volgens conclusie 1, waarbij de toegevoegde hoeveelheid barnsteenzuurdiëthylaminoëthanolcitraat in stap (4) 1 kg per ton bedraagt.The production method according to claim 1, wherein the added amount of succinic acid diethylaminoethanol citrate in step (4) is 1 kg per ton. 8. De bereidingswijze volgens conclusie 1, waarbij in stap (4) het watergehalte van de hoog - rendement magnesium-polyfosfaat meststof minder dan 4% bedraagt.The preparation method according to claim 1, wherein in step (4) the water content of the high-yield magnesium polyphosphate fertilizer is less than 4%.
NL2031501A 2021-11-23 2022-04-05 Preparation method of high - efficiency magnesium polyphosphate fertilizer NL2031501B1 (en)

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