CN111517874A - Novel ecological slow-release nitrogen fertilizer and preparation method thereof - Google Patents
Novel ecological slow-release nitrogen fertilizer and preparation method thereof Download PDFInfo
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- CN111517874A CN111517874A CN202010330526.1A CN202010330526A CN111517874A CN 111517874 A CN111517874 A CN 111517874A CN 202010330526 A CN202010330526 A CN 202010330526A CN 111517874 A CN111517874 A CN 111517874A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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- 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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- 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
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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Abstract
The invention discloses a novel ecological slow-release nitrogen fertilizer and a preparation method thereof, wherein the preparation method comprises the following steps of: 62-80% of urea, 10-25% of ammonium chloride, 0.2-0.7% of slow release agent, 5-8% of humic acid, 2-4% of high polymer and 2-5% of coating material. The preparation method adopts a granulation technology of a granulation method and a production technology of a slow release fertilizer of a coating film and an endoplasm type (added with a slow release agent), the product has the advantages of good slow release effect and low cost, and the effects of improving soil and improving the quality and the yield of crops are realized by adding humic acid and a high molecular polymer.
Description
Technical Field
The invention relates to a nitrogen fertilizer, in particular to a novel ecological slow-release nitrogen fertilizer and a preparation method thereof.
Background
When the fertilizer is applied in large quantities for a long time in China, the yield of crops is increased, and meanwhile, serious soil, air and water pollution is caused. The top dressing is an important component of crop fertilization, the top dressing accounts for about 40% of the total fertilizer consumption, the top dressing technology has deeper research in the present stage of China, but the research and development of top dressing varieties are insufficient, most of the existing top dressing varieties use simple-substance nitrogen fertilizers such as urea, ammonium chloride, ammonium sulfate and the like, the fertilizer has single function, and the volatilization of nitrogen elements is accelerated due to the high temperature of the top dressing in summer, so that a large amount of nitrogen nutrients are lost, and the environment is polluted. In addition, the elemental nitrogen fertilizer only contains nitrogen element, which can not effectively improve the utilization rate of fertilizer nutrients and improve soil environment.
Disclosure of Invention
The invention aims to provide a novel ecological slow-release nitrogen fertilizer, which adopts two slow-release fertilizer production technologies of a coating film and an endoplasm type (added with a slow-release agent), has good slow-release effect of a product, low cost and no pollution to the soil environment, and simultaneously contains humic acid and a high-molecular polymer, and realizes the purposes of improving the soil and improving the quality and the yield of crops.
The invention also aims to utilize the cooler to simultaneously complete fertilizer coating and cooling, no special coating equipment is needed, the process flow is optimized, and the equipment investment is reduced.
In order to solve the technical problems, the invention adopts the technical scheme that: a novel ecological slow-release nitrogen fertilizer comprises, by mass, 62-80% of urea, 10-25% of ammonium chloride, 0.2-0.7% of a slow-release agent, 5-8% of humic acid, 2-4% of a high-molecular polymer and 2-5% of a coating material.
The slow release agent is a combination of a urease inhibitor and a nitrification inhibitor, the urease inhibitor can inhibit the hydrolysis speed of urea and reduce the volatilization loss of ammonium nitrogen, the nitrification inhibitor can control the reaction speed of converting the ammonium nitrogen into nitrate nitrogen, the loss of the ammonium nitrogen in the form of the nitrate nitrogen is reduced, and the utilization rate of nitrogen nutrients is effectively improved.
The high molecular polymer is polyacrylamide, can improve the granular structure of soil, prevent soil hardening, and also has the characteristic of preventing product caking, and the addition amount is determined according to the soil condition and the caking degree of the product.
The coating material is liquid sodium silicate, and a film body is formed on the surface of fertilizer particles by utilizing the characteristics of large specific area, good water resistance and improvement of material density and strength after the coating material is viscous and solidified, so that the coating material has the characteristics of low cost and good slow release effect.
The preparation method of the novel ecological slow-release nitrogen fertilizer is characterized by comprising the following steps:
(1) adding metered urea into a melting tank, controlling the temperature of the melting tank to be 115-125 ℃, wherein the temperature in the melting process is particularly important, if the temperature reaches above 130 ℃, the urea is decomposed to generate a large amount of biuret, so that crops are burned, the temperature is lower than 115 ℃, and the urine is easy to crystallize, so that the normal production is influenced;
(2) adding metered ammonium amide, a slow-release agent, humic acid and a high-molecular polymer into a rotary drum granulator through a microcomputer batching system by utilizing a granulation compound fertilizer production device, atomizing the urea solution prepared in the step (1) and spraying the atomized urea solution into materials in the rotary drum granulator, finishing a material granulation process by utilizing the urea solution as a liquid phase, controlling the material temperature in the rotary drum granulator to be 60-65 ℃, and granulating for 6-8 min;
(3) after granulation, the material enters a dryer, the inlet temperature of the dryer is controlled at 125 ℃ and 110-;
(4) after drying, respectively carrying out coarse screening and fine screening, wherein the diameter of a screen hole of the coarse screen is 4.5mm, the diameter of a screen hole of the fine screen is 2.0mm, particles with the diameter of more than 4.5mm after coarse screening are crushed by a crusher, powder materials with the diameter of less than 2.0mm after fine screening are returned to a rotary drum granulator, and qualified products enter a cooling machine;
(5) spraying liquid sodium silicate onto qualified products at the inlet of a cooling machine in an atomizing mode, wrapping the surfaces of the screened fertilizer particles, and finishing coating by utilizing the temperature of the fertilizer and the cooling machine without additionally adding coating equipment, wherein the coating and cooling time is 25-35 min;
(6) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
Compared with the prior art, the novel ecological slow-release nitrogen fertilizer and the preparation method thereof have the following advantages:
1. by adopting the production technology of the coated and endoplasmic type slow-release fertilizer, the product has good slow-release effect and low cost.
2. The liquid sodium silicate of the coating material can be degraded in soil, is rich in medium element silicon required by crop growth, and cannot cause secondary pollution to the soil.
3. The product not only contains nitrogen elements required by crops, but also contains humic acid for improving soil and high molecular polymer.
Drawings
FIG. 1 is a flow chart of a preparation method of the novel ecological slow-release nitrogen fertilizer.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in figure 1, the novel ecological slow-release nitrogen fertilizer comprises, by mass, 62-80% of urea, 10-25% of ammonium chloride, 0.2-0.7% of slow-release agent, 5-8% of humic acid, 2-4% of high-molecular polymer and 2-5% of coating material.
The slow release agent is a combination of urease inhibitor and nitrification inhibitor.
The high molecular polymer is polyacrylamide, and the adding amount is determined according to the soil condition and the caking degree of the product.
The coating material is liquid sodium silicate.
The preparation method of the novel ecological slow-release nitrogen fertilizer is characterized by comprising the following steps:
(1) adding metered urea into a melting tank, wherein the temperature of the melting tank is controlled to be 115-125 ℃;
(2) adding metered ammonium amide, a slow-release agent, humic acid and a high-molecular polymer into a rotary drum granulator through a microcomputer batching system by utilizing a granulation compound fertilizer production device, atomizing the urea solution prepared in the step (1) and spraying the atomized urea solution into materials in the rotary drum granulator, finishing a material granulation process by utilizing the urea solution as a liquid phase, controlling the material temperature in the rotary drum granulator to be 60-65 ℃, and granulating for 6-8 min;
(3) after granulation, the material enters a dryer, the inlet temperature of the dryer is controlled at 125 ℃ and 110-;
(4) after drying, respectively carrying out coarse screening and fine screening, wherein the diameter of a screen hole of the coarse screen is 4.5mm, the diameter of a screen hole of the fine screen is 2.0mm, particles with the diameter of more than 4.5mm after coarse screening are crushed by a crusher, powder materials with the diameter of less than 2.0mm after fine screening are returned to a rotary drum granulator, and qualified products enter a cooling machine;
(5) spraying liquid sodium silicate onto qualified products at the inlet of a cooling machine in an atomizing mode, wrapping the surfaces of the screened fertilizer particles, and finishing coating by utilizing the temperature of the fertilizer and the cooling machine, wherein the coating and cooling time is 25-35 min;
(6) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
The invention is further illustrated by the following examples:
example 1: the product proportion is 38%, taking the consumption quota of 1 ton of product raw materials as an example:
the specific production flow is as follows:
(1) 740 kilograms of metered urea (containing 46.2 percent of N, the mass percentage is the same as the following) is added into a melting tank, and the temperature of the melting tank is controlled at 115 ℃;
(2) 154 kg of metered ammonium amide (containing 25.3 percent of N), 4 kg of urease inhibitor, 2 kg of nitrification inhibitor, 50 kg of humic acid and 25 kg of polyacrylamide are added into a rotary drum granulator through a microcomputer batching system, and the urea solution prepared in the step (1) is atomized and sprayed into the materials in the rotary drum granulator, the urea solution is used as a liquid phase to complete the granulation process of the materials, the temperature of the materials in the rotary drum granulator is controlled at 60 ℃, and the granulation time is 7 min;
(3) after granulation, the materials enter a dryer, the inlet temperature of the dryer is controlled at 115 ℃, and the drying time is 43 min;
(4) respectively screening after drying, crushing the screened particles with the particle size of more than 4.5mm by a crusher, returning the powder material with the particle size of less than 2.0mm to a rotary drum granulator, and feeding the qualified product to a cooler;
(5) spraying 25 kilograms of liquid sodium silicate on qualified product particles in an atomizing mode at an inlet of a cooling machine, and then cooling for 35 min;
(6) and (3) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment to obtain the novel ecological slow-release nitrogen fertilizer with the granularity of 2-4.5 mm. The product contains 38.09% of N, humic acid and high molecular polymer, the water content is 1.7%, the strength is 16N, and the particles are smooth and round.
Example 2: the product proportion is 35 percent, taking the consumption quota of 1 ton of product raw materials as an example:
the specific production flow is as follows:
(1) adding 640 kg of metered urea (containing 46.2 percent of N, the mass percent is the same as the following) into a melting tank, and controlling the temperature of the melting tank at 120 ℃;
(2) 225 kg of metered ammonium amide (containing 25.3 percent of N), 3 kg of urease inhibitor, 2 kg of nitrification inhibitor, 60 kg of humic acid and 30 kg of polyacrylamide are added into a rotary drum granulator through a microcomputer batching system, and the urea solution prepared in the step (1) is atomized and sprayed into the materials in the rotary drum granulator, the urea solution is used as a liquid phase to complete the granulation process of the materials, the temperature of the materials in the rotary drum granulator is controlled at 65 ℃, and the granulation time is 7 min;
(3) after granulation, the materials enter a dryer, the inlet temperature of the dryer is controlled at 120 ℃, and the drying time is 40 min;
(4) respectively screening after drying, crushing the screened particles with the particle size of more than 4.5mm by a crusher, returning the powder material with the particle size of less than 2.0mm to a rotary drum granulator, and feeding the qualified product to a cooler;
(5) spraying 40 kg of liquid sodium silicate on qualified product particles in an atomizing manner at the inlet of a cooler, and then cooling for 30 min;
(6) and (3) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment to obtain the novel ecological slow-release nitrogen fertilizer with the granularity of 2-4.5 mm. The product contains 35.26 percent of N, humic acid and high molecular polymer, contains 1.8 percent of water and 15N of strength, and has smooth and round particles.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A novel ecological slow-release nitrogen fertilizer is characterized in that urea accounts for 62-80% of the total input raw material amount by mass, ammonium chloride accounts for 10-25% of the total input raw material amount by mass, a slow-release agent accounts for 0.2-0.7% of the total input raw material amount by mass, humic acid accounts for 5-8% of the total input raw material amount by mass, a high-molecular polymer accounts for 2-4% of the total input raw material amount by mass, and a coating material accounts for 2-5% of the total input raw material amount by mass.
2. The novel ecological slow-release nitrogen fertilizer as claimed in claim 1, wherein the slow-release agent is a combination of two of urease inhibitor and nitrification inhibitor.
3. The novel ecological slow-release nitrogen fertilizer as claimed in claim 1, wherein the high molecular polymer is polyacrylamide, and the addition amount is determined according to soil conditions and the caking degree of the product.
4. The novel ecological slow-release nitrogen fertilizer as claimed in claim 1, wherein the coating material is liquid sodium silicate.
5. The preparation method of the novel ecological slow-release nitrogen fertilizer as claimed in claim 1, characterized by comprising the following steps:
(1) adding metered urea into a melting tank, wherein the temperature of the melting tank is controlled to be 115-125 ℃;
(2) adding metered ammonium amide, a slow-release agent, humic acid and a high-molecular polymer into a rotary drum granulator through a microcomputer batching system by utilizing a granulation compound fertilizer production device, atomizing the urea solution prepared in the step (1) and spraying the atomized urea solution into materials in the rotary drum granulator, finishing a material granulation process by utilizing the urea solution as a liquid phase, controlling the material temperature in the rotary drum granulator to be 60-65 ℃, and granulating for 6-8 min;
(3) after granulation, the material enters a dryer, the inlet temperature of the dryer is controlled at 125 ℃ and 110-;
(4) after drying, respectively carrying out coarse screening and fine screening, wherein the diameter of a screen hole of the coarse screen is 4.5mm, the diameter of a screen hole of the fine screen is 2.0mm, particles with the diameter of more than 4.5mm after coarse screening are crushed by a crusher, powder materials with the diameter of less than 2.0mm after fine screening are returned to a rotary drum granulator, and qualified products enter a cooling machine;
(5) spraying liquid sodium silicate onto qualified products at the inlet of a cooling machine in an atomizing mode, wrapping the surfaces of the screened fertilizer particles, and finishing coating by utilizing the temperature of the fertilizer and the cooling machine, wherein the coating and cooling time is 25-35 min;
(6) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
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| CN202010330526.1A CN111517874A (en) | 2020-04-20 | 2020-04-20 | Novel ecological slow-release nitrogen fertilizer and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522993A (en) * | 2003-09-03 | 2004-08-25 | 曹承绵 | Water preserving nitrogenous fertilizer synergist and preparation method thereof |
| CN105110999A (en) * | 2015-10-15 | 2015-12-02 | 天津芦阳化肥股份有限公司 | Biological compound fertilizer for soybeans and preparation method of biological compound fertilizer |
| CN106518575A (en) * | 2016-11-08 | 2017-03-22 | 李健伟 | Multifunctional long-acting urea and preparation method thereof |
| CN110590439A (en) * | 2019-08-26 | 2019-12-20 | 唐山滦胜农业科技有限公司 | High-tower slow-release compound fertilizer and preparation method thereof |
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- 2020-04-20 CN CN202010330526.1A patent/CN111517874A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1522993A (en) * | 2003-09-03 | 2004-08-25 | 曹承绵 | Water preserving nitrogenous fertilizer synergist and preparation method thereof |
| CN105110999A (en) * | 2015-10-15 | 2015-12-02 | 天津芦阳化肥股份有限公司 | Biological compound fertilizer for soybeans and preparation method of biological compound fertilizer |
| CN106518575A (en) * | 2016-11-08 | 2017-03-22 | 李健伟 | Multifunctional long-acting urea and preparation method thereof |
| CN110590439A (en) * | 2019-08-26 | 2019-12-20 | 唐山滦胜农业科技有限公司 | High-tower slow-release compound fertilizer and preparation method thereof |
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