CN111574273A - Preparation method of poly ammonium phosphate calcium nitrate magnesium fertilizer and poly ammonium phosphate calcium nitrate magnesium fertilizer - Google Patents
Preparation method of poly ammonium phosphate calcium nitrate magnesium fertilizer and poly ammonium phosphate calcium nitrate magnesium fertilizer Download PDFInfo
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- CN111574273A CN111574273A CN202010336340.7A CN202010336340A CN111574273A CN 111574273 A CN111574273 A CN 111574273A CN 202010336340 A CN202010336340 A CN 202010336340A CN 111574273 A CN111574273 A CN 111574273A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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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
- 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
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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Abstract
The application provides a preparation method of a poly ammonium phosphate calcium nitrate magnesium fertilizer and the poly ammonium phosphate calcium nitrate magnesium fertilizer. The preparation method comprises the steps of providing calcium magnesium ammonium nitrate, and carrying out melting operation on the calcium magnesium ammonium nitrate to obtain molten calcium magnesium ammonium nitrate. Providing ammonium polyphosphate, and adding the ammonium polyphosphate into molten calcium magnesium ammonium nitrate to perform reaction. And granulating the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate to obtain the ammonium polyphosphate calcium magnesium fertilizer. According to the preparation method provided by the application, on the basis of calcium magnesium ammonium nitrate disclosed in the prior art, the phosphorus element can be increased by adding the ammonium polyphosphate, so that more nutrient elements can be absorbed by plants. And secondly, because the ammonium polyphosphate is an unbranched long-chain polymer and exists in the form of a polymer, the ammonium polyphosphate calcium magnesium fertilizer can be effectively prevented from reacting with calcium, magnesium, iron, aluminum and other ions in a soil solution to cause phosphate radical failure. Ammonium polyphosphate also has the function of chelating metal ions, and improves the activity of trace elements such as zinc, manganese and the like.
Description
Technical Field
The application belongs to the technical field of fertilizers, and particularly relates to a preparation method of a poly-ammonium phosphate calcium magnesium nitrate fertilizer and the poly-ammonium phosphate calcium magnesium nitrate fertilizer.
Background
Plants usually need to take in nutrient elements in the growing process, and in order to improve the yield and the quality of the plants, the nutrient elements needed by the plants, namely fertilizers, are usually added artificially at present. However, plants usually require a plurality of different nutrient elements at the same time, and therefore, some compound fertilizers may not meet the requirements, i.e., some compound fertilizers do not completely contain the nutrient elements required by the plants. Alternatively, some compound fertilizers contain the nutrient elements required by the plants, but the compound fertilizers cannot be effectively absorbed by the plants due to the difference in structure and composition.
Disclosure of Invention
In view of this, the first aspect of the present application provides a method for preparing a poly ammonium phosphate calcium nitrate magnesium fertilizer, the method comprising:
providing calcium magnesium ammonium nitrate, and carrying out a melting operation on the calcium magnesium ammonium nitrate to obtain the molten calcium magnesium ammonium nitrate;
providing poly ammonium phosphate, and adding the poly ammonium phosphate into the molten calcium magnesium ammonium nitrate for reaction;
and granulating the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate to obtain the ammonium polyphosphate calcium magnesium fertilizer.
According to the preparation method provided by the first aspect of the application, on the basis of calcium magnesium ammonium nitrate already disclosed in the prior art, the phosphorus element can be increased by adding the ammonium polyphosphate, so that more nutrient elements can be absorbed by plants. And secondly, because the ammonium polyphosphate is an unbranched long-chain polymer and exists in the form of a polymer, the ammonium polyphosphate calcium magnesium fertilizer can be effectively prevented from reacting with calcium, magnesium, iron, aluminum and other ions in a soil solution to cause phosphate radical failure. Ammonium polyphosphate also has the function of chelating metal ions, and improves the activity of trace elements such as zinc, manganese and the like.
Wherein the step of adding the ammonium polyphosphate into the molten calcium magnesium ammonium nitrate to react comprises the following steps:
in the reaction process, the reaction temperature is 125-140 ℃, and the reaction time is 0.25-0.5 h.
Wherein "providing calcium magnesium ammonium nitrate" includes:
calcium magnesium ammonium nitrate is provided, which is a by-product from chemical beneficiation of low magnesium phosphate concentrate.
Wherein, after the "adding the poly ammonium phosphate into the molten calcium magnesium ammonium nitrate for reaction", the method further comprises the following steps:
providing a material containing trace elements, and adding the material containing the trace elements into the reacted calcium magnesium ammonium nitrate and the polyphosphoric ammonium.
Wherein, the mass ratio of the calcium magnesium ammonium nitrate, the ammonium polyphosphate and the trace elements is as follows: (89-98): (1-10): (0-1).
Wherein, after the step of granulating the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate to obtain the ammonium polyphosphate calcium magnesium nitrate fertilizer, the method further comprises the following steps:
and screening the ammonium polyphosphate calcium magnesium fertilizer to obtain the ammonium polyphosphate calcium magnesium fertilizer with the particle size of 2.8-3.6 mm.
The application provides a poly ammonium calcium magnesium nitrate fertilizer, which comprises nitrogen element, calcium element, magnesium element and phosphorus oxide; the mass fraction of the nitrogen element is not less than 17.5%, the mass fraction of the calcium element is 11-12.5%, the mass fraction of the magnesium element is 3-3.8%, and the mass fraction of the phosphorus oxide is 1-6%.
The poly-ammonium phosphate calcium nitrate magnesium fertilizer that this application second aspect provided, this application is through addding poly-ammonium phosphate to can increase the phosphorus element on the basis in calcium magnesium ammonium nitrate, make the plant can absorb more nutrient element. And secondly, the ammonium polyphosphate is an unbranched long-chain polymer, and can effectively prevent phosphorus and calcium from reacting to generate precipitates, so that the precipitates are not easily absorbed by plants, and the performance of the fertilizer is reduced. In addition, each element and composition of the fertilizer have certain range requirements, and when each element and composition meet the range, the performance of the poly ammonium phosphate calcium nitrate magnesium fertilizer can be further improved, the absorption of plants is accelerated, and the fertilizer has great help to the increase of the yield of the plants.
The ammonium polyphosphate calcium nitrate magnesium fertilizer also comprises trace elements, wherein the mass fraction of the trace elements is not more than 0.5%, and the mass fraction of the calcium elements is 11-12%.
Wherein the polymerization rate of the poly ammonium phosphate calcium nitrate magnesium fertilizer is 20-60%.
Wherein the particle size of the ammonium polyphosphate calcium nitrate magnesium fertilizer is 2.8-3.6 mm.
Drawings
In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.
Fig. 1 is a process flow diagram of a preparation method provided in the first embodiment of the present application.
Fig. 2 is a process flow diagram of a manufacturing method according to a second embodiment of the present disclosure.
Fig. 3 is a process flow diagram of a manufacturing method according to a third embodiment of the present application.
Fig. 4 is a process flow diagram of a manufacturing method according to a fourth embodiment of the present disclosure.
Fig. 5 is a process flow diagram of a manufacturing method according to a fifth embodiment of the present application.
Detailed Description
The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.
Referring to fig. 1, fig. 1 is a process flow chart of a manufacturing method according to a first embodiment of the present disclosure. The application provides a preparation method of a poly ammonium phosphate calcium nitrate magnesium fertilizer, which comprises S100, S200 and S300. The details of S100, S200, and S300 are as follows.
S100, providing calcium magnesium ammonium nitrate, and carrying out melting operation on the calcium magnesium ammonium nitrate to obtain molten calcium magnesium ammonium nitrate.
The ammonium nitrate calcium magnesium has nutrient elements necessary for plants such as nitrogen, calcium, magnesium and the like. In addition, the method can also perform melting operation on the calcium magnesium ammonium nitrate to ensure that the calcium magnesium ammonium nitrate becomes molten, thereby providing a good reaction basis for the subsequent reaction with the ammonium polyphosphate. Optionally, the melting temperature is 130-145 ℃, and the melting time is 0.25-0.5 h. Further optionally, the melting temperature is 135-140 ℃, and the melting time is 0.3-0.4 h.
And S200, providing the ammonium polyphosphate, and adding the ammonium polyphosphate into the molten calcium magnesium ammonium nitrate for reaction.
The poly-ammonium phosphate provided by the application can also be understood as poly-ammonium phosphate which is an unbranched long-chain polymer, and poly-ammonium phosphate is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in soil to be utilized by the plants, so that the nutrients of the product are slowly released, the utilization rate of the fertilizer is improved, and the fertilizer efficiency is prolonged. The ammonium polyphosphate is added into the molten calcium magnesium ammonium nitrate, and the ammonium polyphosphate and the calcium magnesium ammonium nitrate can be more fully mixed and contacted because the calcium magnesium ammonium nitrate is molten.
In addition, the reaction of the ammonium polyphosphate with the calcium magnesium ammonium nitrate is not a simple physical mixture. The amount of crystal water brought by the reaction of the ammonium polyphosphate and the calcium magnesium ammonium nitrate changes. For example, the crystallization water amount of the ammonium polyphosphate and the calcium magnesium ammonium nitrate before the reaction is respectively 4 crystallization water amounts and 8 crystallization water amounts. However, the amount of the crystal water after the reaction of the ammonium polyphosphate and the calcium magnesium ammonium nitrate is 2 crystal water and 6 crystal water respectively. The amount of crystal water also affects the preparation of the ammonium polyphosphate nitrate calcium magnesium fertilizer, and if the content of the crystal water is high, solid fertilizer particles cannot be formed in the subsequent granulation process.
Optionally, the mass fraction of nitrogen element in the ammonium polyphosphate is not less than 18%, and the mass fraction of phosphorus pentoxide is not less than 60%.
S300, granulating the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate to obtain the ammonium polyphosphate calcium magnesium fertilizer.
The reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate are granulated, and then the ammonium polyphosphate calcium magnesium fertilizer can be obtained. Alternatively, the granulation process comprises a rotary drum fluidized bed granulation process, a disc granulation process, a slurry spray granulation process, or a steel belt granulation process. Optionally, the frequency of the granulator is 38-42Hz, the pore size of the granulator is 2.8-3.2mm, and the granulation temperature is 95-115 ℃.
According to the content, on the basis of calcium magnesium ammonium nitrate disclosed in the prior art, the phosphorus element can be increased by adding the ammonium polyphosphate, so that more nutrient elements can be absorbed by plants. And secondly, because the ammonium polyphosphate is an unbranched long-chain polymer and exists in the form of a polymer, the ammonium polyphosphate calcium magnesium fertilizer can be effectively prevented from reacting with calcium, magnesium, iron, aluminum and other ions in a soil solution to cause phosphate radical failure. Ammonium polyphosphate also has the function of chelating metal ions, and improves the activity of trace elements such as zinc, manganese and the like.
In addition, the calcium magnesium ammonium nitrate is melted and then added with the polyphosphoric ammonium in proportion to synthesize the fertilizer containing the calcium magnesium ammonium nitrate, and the product contains a proper amount of nitrate nitrogen, ammonium nitrogen, water-soluble calcium, water-soluble magnesium and polyphosphoric ammonium, so that the unit nutrient cost of the product is low, and the product price is easily accepted by the market.
Referring to fig. 2, fig. 2 is a process flow chart of a manufacturing method according to a second embodiment of the present disclosure. In the present embodiment, S200 "adding the polyphosphazene to the molten calcium magnesium ammonium nitrate for reaction" includes S210. The details of S210 are as follows.
S210, in the reaction process, the reaction temperature is 125-140 ℃, and the reaction time is 0.25-0.5 h.
From the above, it is known that the amount of crystallization water in the reactor varies between the polyphosphate and the calcium magnesium ammonium nitrate, and thus the reaction conditions need to be strictly controlled. Only when the reaction temperature is controlled at 125-140 ℃ and the reaction time is controlled at 0.25-0.5h, the amount of the crystal water can meet the requirement of granulation.
In addition, when the poly ammonium phosphate reacts with the molten calcium magnesium ammonium nitrate, the poly ammonium phosphate and the molten calcium magnesium ammonium nitrate can also have a chelating reaction, so that the poly ammonium phosphate and the calcium magnesium ammonium nitrate form a chelating state, and the poly ammonium phosphate and the calcium magnesium ammonium nitrate can be absorbed by plants more easily. Therefore, the reaction conditions are also strictly controlled in the present application. Only when the reaction temperature is controlled at 125-140 ℃ and the reaction time is controlled at 0.25-0.5h, the product with excellent chelating effect can be formed, and the crop can be absorbed more easily. Alternatively, the reaction temperature is 130-135 ℃, and the reaction time is 0.3-0.4 h.
Referring to fig. 3, fig. 3 is a process flow chart of a manufacturing method according to a third embodiment of the present disclosure. In this embodiment, S100 "providing calcium magnesium ammonium nitrate" includes S110. The details of S110 are as follows.
And S110, providing calcium magnesium ammonium nitrate, wherein the calcium magnesium ammonium nitrate is obtained from a by-product of the production of the low-magnesium phosphate concentrate by chemical beneficiation.
The calcium magnesium ammonium nitrate provided herein can have a variety of source forms, and in one embodiment, the calcium magnesium ammonium nitrate can be derived from a by-product of chemical beneficiation to produce a low magnesium phosphate concentrate.
In another embodiment, the calcium magnesium ammonium nitrate may be artificially prepared. For example, by providing ammonium nitrate, calcium nitrate, and magnesium nitrate, the ammonium nitrate is first mixed with the calcium nitrate to provide a concentrated solution of calcium ammonium nitrate. And then adding the concentrated magnesium nitrate solution into the concentrated calcium ammonium nitrate solution, and evaporating and concentrating to obtain the calcium magnesium ammonium nitrate with high purity.
Optionally, in the calcium magnesium ammonium nitrate provided by the application, the total mass fraction of nitrogen element is 18.03%, the mass fraction of calcium element is 12.34%, the mass fraction of magnesium element is 3.83%, and the mass fraction of water is 11.98%. Further optionally. The nitrogen element includes ammonium nitrogen and nitrate nitrogen. Wherein the mass fraction of ammonium nitrogen is 2.46 percent.
Referring to fig. 4, fig. 4 is a process flow chart of a manufacturing method according to a fourth embodiment of the present disclosure. In the present embodiment, S220 is further included after S200 "adding the polyphosphazene to the molten calcium magnesium ammonium nitrate for reaction". The details of S220 are as follows.
S220, providing a material containing trace elements, and adding the material containing the trace elements into the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate.
The chelated trace elements can be added into the reacted calcium magnesium ammonium nitrate and the polyphosphazene, so that the trace elements required by the growth of crops can be supplemented, the disease resistance of roots, stems and leaves of the crops can be enhanced, the photosynthesis of the crops can be increased, the activity of enzyme can be improved, and the yield and the quality can be further improved; therefore, the ammonium polyphosphate nitrate calcium magnesium fertilizer has more nutrient elements required by plants, and further promotes the absorption effect of the plants. Optionally, the mass ratio of the calcium magnesium ammonium nitrate, the ammonium polyphosphate and the trace elements is as follows: (89-98): (1-10): (0-1). Optionally, the trace elements include one or more of boron, copper, iron, zinc, manganese, and molybdenum. Further optionally, the trace element-containing material comprises one or more of boric acid, EDTA-copper, EDTA-iron, EDTA-zinc, EDTA-manganese, and ammonium molybdate. Optionally, the material containing the trace elements is added into the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate, wherein the melting temperature is 120-135 ℃, and the reaction time is 0.25-0.5 h.
Referring to fig. 5, fig. 5 is a process flow chart of a manufacturing method according to a fifth embodiment of the present disclosure. In this embodiment, after the step S300 "granulating the reacted calcium magnesium ammonium nitrate and the polyphosphoric acid ammonium to obtain a polyphosphoric acid ammonium calcium magnesium ammonium nitrate fertilizer", the method further includes a step S310. The details of S310 are as follows.
S310, screening the ammonium polyphosphate calcium magnesium fertilizer to obtain the ammonium polyphosphate calcium magnesium fertilizer with the particle size of 2.8-3.6 mm.
After the granulation, the poly ammonium phosphate calcium magnesium nitrate fertilizer can be crushed and screened, so that the particle size of the poly ammonium phosphate calcium magnesium nitrate fertilizer is reduced, and the particle size of the poly ammonium phosphate calcium magnesium nitrate fertilizer is in a certain range. Optionally, the particle size of the final sieved ammonium polyphosphate nitrate calcium magnesium fertilizer is 2.8-3.6 mm. If the particle size of the ammonium polyphosphate nitrate calcium magnesium fertilizer is less than 2.8mm, the fertilizer particles are too small, so that the fertilizer can be quickly absorbed by plants, and the problem of plant root burning occurs. If the particle size of the ammonium polyphosphate nitrate calcium magnesium fertilizer is larger than 3.6mm, the fertilizer particles are larger, the specific surface area is smaller, the fertilizer is not easily absorbed by plants, the fertilizer takes effect slowly, and the fertilizer can be deposited in soil, so that the soil is hardened.
Further optionally, the particle size of the final sieved ammonium polyphosphate nitrate calcium magnesium fertilizer is 3.0-3.4 mm. And melting and granulating the sieved ammonium polyphosphate calcium magnesium nitrate fertilizer with the particle size of less than 2.8mm and the particle size of more than 3.6mm again.
Besides the preparation method of the poly-ammonium phosphate calcium nitrate magnesium fertilizer, the application also provides the poly-ammonium phosphate calcium nitrate magnesium fertilizer. The preparation method of the poly ammonium phosphate calcium nitrate magnesium fertilizer and the poly ammonium phosphate calcium nitrate magnesium fertilizer provided by the embodiment of the application can achieve the technical effects of the application, the two can be used together, and certainly can also be used independently, and the application has no special limitation. For example, as an embodiment, the above method of preparing a calcium magnesium polyphosphate nitrate fertilizer may be used to prepare the following calcium magnesium polyphosphate nitrate fertilizer.
The application provides a poly ammonium phosphate calcium nitrate magnesium fertilizer, and optionally, the poly ammonium phosphate calcium nitrate magnesium fertilizer is prepared by the preparation method. The poly ammonium phosphate calcium nitrate magnesium fertilizer comprises nitrogen element, calcium element, magnesium element and phosphorus oxide; the mass fraction of the nitrogen element is not less than 17.5%, the mass fraction of the calcium element is 11-12.5%, the mass fraction of the magnesium element is 3-3.8%, and the mass fraction of the phosphorus oxide is 1-6%.
Optionally, the calcium element is derived from calcium polyphosphate and calcium nitrate in the calcium polyphosphate magnesium nitrate fertilizer, and the mass ratio of the calcium polyphosphate to the calcium nitrate is 1: (1-50), wherein the magnesium element is derived from magnesium polyphosphate and magnesium nitrate in the poly-ammonium phosphate calcium nitrate magnesium fertilizer, and the mass ratio of the magnesium polyphosphate to the magnesium nitrate is 1: (1-50).
The application provides a poly ammonium phosphate calcium nitrate magnesium fertilizer can know through above-mentioned content, and this application has disclosed calcium magnesium ammonium nitrate on prior art's basis, through addding poly ammonium phosphate, multiplicable phosphorus element to make the plant can absorb more nutrient element. And secondly, because the ammonium polyphosphate is an unbranched long-chain polymer and exists in the form of a polymer, the ammonium polyphosphate calcium magnesium fertilizer can be effectively prevented from reacting with calcium, magnesium, iron, aluminum and other ions in a soil solution to cause phosphate radical failure. Ammonium polyphosphate also has the function of chelating metal ions, and improves the activity of trace elements such as zinc, manganese and the like. In addition, the poly-ammonium phosphate is not directly absorbed by plants, but is gradually hydrolyzed into orthophosphoric acid in the soil to be utilized by the plants, so that the nutrient of the product is slowly released, the utilization rate of the fertilizer is improved, and the fertilizer efficiency is prolonged. In conclusion, the poly-ammonium phosphate, calcium nitrate and magnesium nitrate fertilizer contains poly-calcium phosphate, poly-magnesium phosphate, calcium nitrate, magnesium nitrate, ammonium nitrate, poly-ammonium phosphate, trace poly-ferric phosphate and other poly-trace elements, the product is quick-acting and long-acting, the poly-ammonium phosphate, calcium nitrate and magnesium nitrate fertilizer has quick fertilizer efficiency, can be used as additional fertilizer, base fertilizer and the like, the fertilizer application mode can adopt furrow application, broadcast application and the like, and the product is beneficial to the growth of crops and supplement of medium trace elements.
Optionally, the mass fraction of the nitrogen element is not less than 18%. Optionally, the mass fraction of ammonium nitrogen in the nitrogen element is 2.5-4.5%. Further optionally, the mass fraction of ammonium nitrogen in the nitrogen element is 3.0-4.0%.
Optionally, the polyammonium phosphate calcium nitrate magnesium fertilizer further comprises trace elements, wherein the mass fraction of the trace elements is not more than 0.5%, and the mass fraction of the calcium elements is 11-12%.
This application still can add microelement to after the reaction ammonium nitrate calcium magnesium with among the polyphosphate to make the fertile required nutrient element of more plants that has of ammonium polyphosphate calcium magnesium, thereby improve the fertile performance of ammonium nitrate calcium magnesium of ammonium polyphosphate, further promote the absorption effect of plant. And when the trace elements are increased, the mass fraction of the calcium element is slightly reduced. Optionally, the trace elements include one or more of boron, copper, iron, zinc, manganese, and molybdenum. Optionally, the mass fraction of ammonium nitrogen in the nitrogen element is 2.5-4.0%. Further optionally, the mass fraction of ammonium nitrogen in the nitrogen element is 3.0-3.5%. Further optionally, the trace element-containing material comprises one or more of boric acid, EDTA-copper, EDTA-iron, EDTA-zinc, EDTA-manganese, and ammonium molybdate.
Optionally, the polymerization rate of the ammonium polyphosphate calcium nitrate magnesium fertilizer is 20-60%.
The polymerization rate of the poly ammonium phosphate calcium nitrate magnesium fertilizer provided by the application is controlled to be 20-60%. Can make the phosphorus in the product have higher effectiveness and promote the absorption of the root system to the trace elements in the soil. Further optionally, the polymerization rate of the poly ammonium phosphate calcium nitrate magnesium fertilizer is 30-50%.
Optionally, the particle size of the ammonium polyphosphate calcium nitrate magnesium fertilizer is 2.8-3.6 mm.
The particle size of the poly ammonium phosphate calcium nitrate magnesium fertilizer can be controlled to be 2.8-3.6mm by crushing and screening. Therefore, the poly-ammonium phosphate calcium nitrate magnesium fertilizer can be quickly absorbed by soil and plants in the using process, and the speed of the plants for absorbing the poly-ammonium phosphate calcium nitrate magnesium fertilizer is increased. Further optionally, the particle size of the poly ammonium phosphate calcium nitrate magnesium fertilizer is 3.0-3.4 mm.
Optionally, the shape of the ammonium polyphosphate calcium nitrate magnesium fertilizer is hemispherical.
The fertilizer can be granulated into a hemisphere shape, so that the specific surface area of the fertilizer is increased, and the absorption of soil and plants is promoted.
Embodiments of the present invention will be further illustrated by the following examples.
Preparation examples
Example 1:
step 1: 97kg of calcium magnesium ammonium nitrate was supplied and sent to a dissolution tank, and the calcium magnesium ammonium nitrate was subjected to a melting operation. The melting temperature is 135 ℃, and the reaction time is 15 min.
Step 2: and (3) delivering the molten calcium magnesium ammonium nitrate to a primary tank, adding 3kg of ammonium polyphosphate, and uniformly stirring at the reaction temperature of 130 ℃ for 15 min.
And step 3: and (3) sequentially conveying the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate into a secondary tank, an emulsifier and a granulator. Wherein the granulation temperature is controlled at 110 ℃, the granulator frequency is 38Hz, and the granulator aperture is 2.8mm, so as to obtain the ammonium polyphosphate calcium magnesium fertilizer.
Example 2:
step 1: 94kg of calcium magnesium ammonium nitrate was supplied and sent to a dissolution tank, and the calcium magnesium ammonium nitrate was subjected to a melting operation. The melting temperature is 136 ℃, and the reaction time is 17 min.
Step 2: and (3) sending the molten calcium magnesium ammonium nitrate to a primary tank, adding 5kg of ammonium polyphosphate, and uniformly stirring at the reaction temperature of 132 ℃ for 15 min.
And step 3: and (3) conveying the reacted calcium magnesium ammonium nitrate and ammonium polyphosphate to a secondary tank, adding 1kg of trace elements, and reacting for 18min at the melting temperature of 126 ℃.
And 4, step 4: the slurry is sent to an emulsifier and granulator. Wherein the granulation temperature is controlled at 108 ℃, the granulator frequency is 38Hz, and the granulator aperture is 3.2mm, so as to obtain the ammonium polyphosphate calcium magnesium fertilizer.
Comparative examples
Comparative example 1: the process was substantially the same as in example 1 except that the mass of calcium magnesium ammonium nitrate was 99.5kg, the mass of ammonium polyphosphate was 0.5kg, and the other conditions were the same.
Comparative example 2: the process was substantially the same as in example 1 except that the mass of calcium magnesium ammonium nitrate was 80kg, the mass of ammonium polyphosphate was 20kg, and the other conditions were the same.
Comparative example 3: the process was substantially the same as in example 2 except that the mass of calcium magnesium ammonium nitrate was 85kg, the mass of ammonium polyphosphate was 5kg, the mass of trace elements was 10kg, and the other conditions were the same.
Effects of the embodiment
The components of the polyphosphazene calcium nitrate magnesium fertilizers prepared in the examples 1-2 and the comparative examples 1-3 are respectively detected. The results obtained are shown in the following table.
TABLE 1 component contents of the poly (calcium-magnesium ammonium-phosphate-nitrate) s of examples 1-2 and comparative examples 1-3
The contents of the tables show that the poly calcium magnesium ammonium phosphate nitrate fertilizers prepared in the examples 1 and 2 provided by the application have higher polymerization rates, and the polymerization rate of the example 2 is higher and reaches 60.12%. In addition, the fertilizer prepared by the preparation method of the example 2 has more excellent performance because the fertilizer also contains other trace elements required by plants.
As can be seen from comparison between example 1 and comparative examples 1-2, when the content of the polyphosphate is too low, for example, the weight of the polyphosphate in comparative example 1 is 0.5kg, the effect of the polyphosphate cannot be exerted, and the efficacy of the calcium magnesium ammonium polyphosphate fertilizer is not greatly different from that of the non-added polyphosphate. However, when the content of the polyphosphate is too high, for example, the mass of the polyphosphate in comparative example 2 is 20kg, the content of calcium magnesium ammonium nitrate will be reduced due to the too high content of the polyphosphate, resulting in a decrease in the main component of the fertilizer and a decrease in the performance of the fertilizer.
As can be seen by comparing example 2 with comparative example 3, when the trace elements are too high, for example, in comparative example 3, the mass of the trace elements is 10 kg. Since the content of trace elements required by plants is relatively small, excessive trace elements will cause waste, and the plants cannot absorb the trace elements at all, so that a large amount of trace elements will stay in the soil, thereby preventing the plants from absorbing other nutrient elements.
The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A preparation method of a poly ammonium phosphate calcium nitrate magnesium fertilizer is characterized by comprising the following steps:
providing calcium magnesium ammonium nitrate, and carrying out a melting operation on the calcium magnesium ammonium nitrate to obtain the molten calcium magnesium ammonium nitrate;
providing poly ammonium phosphate, and adding the poly ammonium phosphate into the molten calcium magnesium ammonium nitrate for reaction;
and granulating the reacted calcium magnesium ammonium nitrate and the ammonium polyphosphate to obtain the ammonium polyphosphate calcium magnesium fertilizer.
2. The method of claim 1, wherein the step of adding the polyphosphate ammonium to the molten calcium magnesium ammonium nitrate to react comprises:
in the reaction process, the reaction temperature is 125-140 ℃, and the reaction time is 0.25-0.5 h.
3. The method of claim 1, wherein providing calcium magnesium ammonium nitrate comprises:
calcium magnesium ammonium nitrate is provided, which is a by-product from chemical beneficiation of low magnesium phosphate concentrate.
4. The method according to claim 1, wherein after the step of adding the polyphosphate to the molten calcium magnesium ammonium nitrate for reaction, the method further comprises the following steps:
providing a material containing trace elements, and adding the material containing the trace elements into the reacted calcium magnesium ammonium nitrate and the polyphosphoric ammonium.
5. The production method according to claim 4, wherein the mass ratio of the calcium magnesium ammonium nitrate, the polyphosphazene, and the trace element is, in terms of mass ratio: (89-98): (1-10): (0-1).
6. The method according to claim 1, further comprising, after granulating the reacted calcium magnesium ammonium nitrate with the polyphosphoric acid ammonium to obtain a polyphosphoric acid ammonium nitrate calcium magnesium fertilizer:
and screening the ammonium polyphosphate calcium magnesium fertilizer to obtain the ammonium polyphosphate calcium magnesium fertilizer with the particle size of 2.8-3.6 mm.
7. The poly ammonium phosphate calcium nitrate magnesium fertilizer is characterized by comprising nitrogen elements, calcium elements, magnesium elements and phosphorus oxide; the mass fraction of the nitrogen element is not less than 17.5%, the mass fraction of the calcium element is 11-12.5%, the mass fraction of the magnesium element is 3-3.8%, and the mass fraction of the phosphorus oxide is 1-6%.
8. The calcium magnesium polyphosphate nitrate fertilizer according to claim 7, further comprising trace elements, wherein the mass fraction of the trace elements is not more than 0.5%, and the mass fraction of the calcium element is 11-12%.
9. The calcium magnesium polyphosphate nitrate fertilizer according to claim 7, wherein the polymerization rate of the calcium magnesium polyphosphate nitrate fertilizer is 20 to 60%.
10. The calcium magnesium polyphosphate nitrate fertilizer of claim 7, wherein the particle size of the calcium magnesium polyphosphate nitrate fertilizer is 2.8 to 3.6 mm.
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| CN202010336340.7A Pending CN111574273A (en) | 2020-04-28 | 2020-04-28 | Preparation method of poly ammonium phosphate calcium nitrate magnesium fertilizer and poly ammonium phosphate calcium nitrate magnesium fertilizer |
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