CN111559944A - Multi-element nitrogen-potassium topdressing high-tower compound fertilizer and preparation method thereof - Google Patents

Multi-element nitrogen-potassium topdressing high-tower compound fertilizer and preparation method thereof Download PDF

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CN111559944A
CN111559944A CN202010347502.7A CN202010347502A CN111559944A CN 111559944 A CN111559944 A CN 111559944A CN 202010347502 A CN202010347502 A CN 202010347502A CN 111559944 A CN111559944 A CN 111559944A
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trace elements
potassium
tower
temperature
topdressing
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孟宪英
赵金哲
周时怡
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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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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Abstract

The invention discloses a multi-element nitrogen-potassium topdressing high-tower compound fertilizer and a preparation method thereof, wherein the multi-element nitrogen-potassium topdressing high-tower compound fertilizer comprises the following components in percentage by mass: 52 to 62 percent of urea, 15 to 22 percent of potassium chloride, 10 to 18 percent of ammonium chloride, 0.6 to 1.2 percent of ammonium bicarbonate, 6 to 12 percent of medium trace elements and 1 to 3 percent of biological bacteria. The preparation method adopts a high tower granulation technology, prevents slurry from being viscous through ammoniation medium trace elements, improves the fluidity of the slurry, and solves the technical problem that urine and a material containing sulfate cannot be directly mixed. The product has the characteristics of high tower fertilizer strength, mellow granules and uniform nutrients, also contains medium and trace elements and biological bacteria required by crop growth, and realizes the functions of activating and repairing soil by using the medium and trace elements and the biological bacteria.

Description

Multi-element nitrogen-potassium topdressing high-tower compound fertilizer and preparation method thereof
Technical Field
The invention relates to a high-tower compound fertilizer, in particular to a multi-element nitrogen-potassium topdressing high-tower compound fertilizer and a preparation method thereof.
Background
The cultivated land of our country accounts for 7% of the total amount of the world, but uses chemical fertilizer which accounts for 35% of the world, and the long-term application of a large amount of chemical fertilizer can increase the yield of crops and cause serious soil, air and water pollution. 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, the conventional top dressing varieties generally adopt a mode of applying common compound fertilizers, most of the fertilizers contain phosphorus, the phosphorus is used in a base fertilizer mode in actual use, and the top dressing is only suitable for nitrogen and potassium fertilizers, so that the waste of the phosphorus is caused. In addition, the product only contains nitrogen and potassium elements, does not contain medium and trace elements required by crop growth and biological bacteria for improving soil structure, and cannot effectively improve the utilization rate of fertilizer nutrients and improve soil.
Disclosure of Invention
The invention aims to produce a multi-element nitrogen-potassium topdressing compound fertilizer by using high-tower compound fertilizer production equipment, wherein the product contains medium and trace elements such as sulfur, zinc, calcium, magnesium, manganese, iron and the like and biological bacteria. The purposes of preventing soil hardening, improving soil, improving crop quality and yield and enhancing the disease resistance of crops are achieved.
The invention also aims to complete ammoniation of medium trace elements by adding ammonium bicarbonate so as to prevent a large amount of urea sulfate from being generated by reaction with urine at high temperature, increase the viscosity of slurry and prevent production from being normally carried out.
In order to solve the technical problems, the invention adopts the technical scheme that: a multi-element nitrogen-potassium topdressing high-tower compound fertilizer comprises 52-62% of urea, 15-22% of potassium chloride, 10-18% of ammonium chloride, 0.6-1.2% of ammonium bicarbonate, 6-12% of medium trace elements and 1-3% of biological bacteria.
The preparation method of the multi-element nitrogen-potassium topdressing high-tower compound fertilizer comprises the following steps:
(1) ammoniation of medium and trace elements (for spare)
1.1 mixing materials: adding metered ammonium bicarbonate and medium and trace elements into a mixing stirrer, uniformly stirring for 6-7min, and if urine and the medium and trace elements containing sulfate radicals are directly mixed in a high-tower granulation process, reacting to generate urea sulfate under a high-temperature condition to generate a large amount of liquid phase, so that the viscosity of the material is greatly increased, the production cannot be normally carried out, and therefore, ammoniation treatment needs to be carried out on the medium and trace elements, and the quality of the urea sulfate generated by the reaction is controlled;
1.2, drying and ammoniation: the mixed material enters a drying ammoniation machine, ammoniation and drying treatment of medium trace elements are completed by utilizing the drying temperature, the temperature of gas at the outlet of the drying machine is controlled to be 45-50 ℃, the drying ammoniation time is 30-35min, the water content of the material is controlled to be below 1 percent, if the temperature is too high and the time is too long, the decomposition of ammonium bicarbonate is too fast, the ammoniation effect is not achieved, and if the temperature is low and the time is too short, the ammoniation reaction is not sufficient, and the ammoniation effect is not achieved;
(2) adding metered urea into a melting tank, controlling the temperature of the melting tank to be 120-125 ℃, and overflowing the melted urea solution to a primary mixing tank, wherein the melting temperature is particularly important in the process, if the temperature reaches above 130 ℃, urea is decomposed to generate a large amount of biuret, so that crops are burned, the temperature is lower than 115 ℃, and the urea is easy to crystallize, so that normal production is influenced;
(3) adding metered ammonium chloride into a primary mixing tank, uniformly mixing the ammonium chloride with a urea solution, controlling the temperature of the primary mixing tank to be 110-115 ℃, and overflowing the mixed molten material into a secondary mixing tank;
(4) adding potassium chloride and the ammoniated medium trace elements in the step (1) into a secondary mixing tank in a metering manner, and mixing the potassium chloride and the ammoniated medium trace elements with a molten material for less than 5min to obtain mixed molten slurry, wherein the temperature of the secondary mixing tank is controlled to be 100-105 ℃;
(5) emulsifying the mixed melted slurry by an emulsifying machine, completing spray granulation in a granulation tower by using a differential granulator, and naturally cooling in the granulation tower, wherein the temperature of material particles below the tower is less than 70 ℃;
(6) respectively carrying out coarse screening and fine screening on material particles below the tower, 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, the screened particles with the diameter of more than 4.5mm and the screened particles with the diameter of less than 2.0mm return to a primary mixing tank, and qualified products enter a cooling machine;
(7) spraying the prepared biological bacterial liquid on qualified products at the inlet of a cooling machine in an atomizing mode, quickly sucking the biological bacterial liquid by utilizing the temperature of the biological bacterial liquid, adding the biological bacterial liquid in a cooling process, and quickly sucking the bacterial liquid into formed particles by utilizing the strong absorbability and the self temperature of material particles in an over-dry state, so that the influence on the quality of biological bacteria caused by killing a large amount of biological bacteria due to high temperature in a high tower granulation process is prevented, and the cooling time is 30-35 min;
(8) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
The mass ratio of the ammonium bicarbonate to the medium trace elements is 1: 10.
The medium trace element substance is a combination of zinc sulfate, calcium sulfate, magnesium sulfate, manganese sulfate and ferrous sulfate, and the added medium trace elements and the added amount are determined according to the growth requirements of crops.
The biological bacteria are two combinations of azotobacter and phosphate-dissolving bacteria, are soil beneficial bacteria, and have the effects of improving the utilization rate of fertilizer, activating and repairing soil, and being beneficial to absorption and utilization of crops.
Compared with the prior art, the multi-element nitrogen-potassium topdressing high-tower compound fertilizer and the preparation method thereof have the following advantages:
1. ammonia gas generated by decomposing ammonium bicarbonate is utilized to perform ammoniation on the medium and trace elements in the production process so as to control the quality of urea sulfate generated by the reaction, reduce the viscosity of slurry and ensure the normal production.
2. The product has comprehensive nutrition, contains major elements of nitrogen and potassium required by crops, and also contains medium and trace elements of sulfur, zinc, calcium, magnesium, manganese, iron and the like and biological bacteria. The product has the effects of promoting the fertilizer synergism, improving the physical and chemical properties of soil, improving the quality and the yield of crops and enhancing the disease resistance of the crops.
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FIG. 1 is a flow chart of a preparation method of a multi-element nitrogen-potassium topdressing high-tower compound 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 multi-element nitrogen-potassium topdressing high-tower compound fertilizer is characterized in that urea accounts for 52-62% of the total input raw material amount by mass, potassium chloride accounts for 15-22% of the total input raw material amount by mass, ammonium chloride accounts for 10-18% of the total input raw material amount by mass, ammonium bicarbonate accounts for 0.6-1.2% of the total input raw material amount by mass, medium trace elements account for 6-12% of the total input raw material amount by mass, and biological bacteria accounts for 1-3% of the total input raw material amount by mass.
The preparation method of the multi-element nitrogen-potassium topdressing high-tower compound fertilizer comprises the following steps:
(1) ammoniation of medium and trace elements (for spare)
1.1 mixing materials: adding metered ammonium bicarbonate and medium trace elements into a mixing stirrer, and uniformly stirring for 6-7 min;
1.2, drying and ammoniation: the mixed material enters a drying ammoniation machine, ammoniation and drying treatment of medium trace elements are completed by utilizing the drying temperature, the temperature of gas at the outlet of the drying machine is controlled to be 45-50 ℃, the drying ammoniation time is 30-35min, and the water content of the material is controlled to be below 1%;
(2) adding metered urea into a melting tank, controlling the temperature of the melting tank to be 120-125 ℃, and overflowing the melted urea solution into a primary mixing tank;
(3) adding metered ammonium chloride into a primary mixing tank, uniformly mixing the ammonium chloride with a urea solution, controlling the temperature of the primary mixing tank to be 110-115 ℃, and overflowing the mixed molten material into a secondary mixing tank;
(4) adding potassium chloride and the ammoniated medium trace elements in the step (1) into a secondary mixing tank in a metering manner, and mixing the potassium chloride and the ammoniated medium trace elements with a molten material for less than 5min to obtain mixed molten slurry, wherein the temperature of the secondary mixing tank is controlled to be 100-105 ℃;
(5) emulsifying the mixed melted slurry by an emulsifying machine, completing spray granulation in a granulation tower by using a differential granulator, and naturally cooling in the granulation tower, wherein the temperature of material particles below the tower is less than 70 ℃;
(6) respectively carrying out coarse screening and fine screening on material particles below the tower, 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, the screened particles with the diameter of more than 4.5mm and the screened particles with the diameter of less than 2.0mm return to a primary mixing tank, and qualified products enter a cooling machine;
(7) spraying the prepared biological bacterial liquid onto qualified products at the inlet of a cooling machine in an atomizing mode, and rapidly sucking the biological bacterial liquid by utilizing the temperature of the biological bacterial liquid, wherein the cooling time is 30-35 min;
(8) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
The mass ratio of the ammonium bicarbonate to the medium trace elements is 1: 10.
The medium trace element substance is a combination of zinc sulfate, calcium sulfate, magnesium sulfate, manganese sulfate and ferrous sulfate.
The biological bacteria are two combinations of azotobacter and phosphate-dissolving bacteria.
The invention is further illustrated by the following examples:
example 1: the product proportion is 30-10, taking the consumption quota of 1 ton of product raw materials as an example:
Figure BSA0000207494140000041
the specific production flow is as follows:
(1) ammoniation of medium and trace elements (for spare)
9 kg of measured ammonium bicarbonate (containing 17% of N and the same mass percentage as below), 25 kg of zinc sulfate (containing S and Zn), 35 kg of calcium sulfate (containing S and Ca), 20 kg of magnesium sulfate (containing S and Mg) and 10 kg of manganese sulfate (containing S and Mn) are added into a mixing stirrer and stirred uniformly for 6 min. The stirred mixed material enters a drying ammoniation machine, the temperature of gas at the outlet of the drying machine is controlled at 45 ℃, the drying ammoniation time is 30min, and the water content of the material is controlled below 1%;
(2) metered 563 kg of urea (containing 46.2 percent of N) is added into a melting tank, the temperature of the melting tank is controlled at 125 ℃, and the melted urea solution overflows to a primary mixing tank;
(3) 160 kg of metered ammonium chloride (containing 25.2 percent of N) is added into a first-stage mixing tank and is uniformly mixed with a urea solution by stirring, the temperature of the first-stage mixing tank is controlled at 115 ℃, and the mixed molten material overflows to a second-stage mixing tank;
(4) adding 163 kg of metered potassium chloride (containing K2O 62%) and the ammoniated medium trace elements obtained in the step (1) into a secondary mixing tank, uniformly mixing with a molten material by stirring, controlling the temperature of the secondary mixing tank at 105 ℃, and mixing with the molten material for 4min to obtain mixed molten slurry;
(5) emulsifying the mixed and melted slurry by an emulsifying machine to prepare slurry with good flowing property, completing spray granulation in a granulation tower by using a differential granulator, naturally cooling in the granulation tower, and controlling the temperature of material particles below the tower at 65 ℃;
(6) respectively carrying out coarse screening and fine screening on material particles below the tower, returning the screened particles with the particle size of more than 4.5mm and the screened particles with the particle size of less than 2.0mm to a primary mixing tank, and feeding qualified products into a cooling machine;
(7) spraying 10 kg of prepared nitrogen-fixing bacteria and 5 kg of prepared phosphorus-dissolving bacteria to material particles in an atomizing manner at the inlet of a cooling machine, and then cooling for 35 min;
(8) and (4) feeding the cooled qualified product into a wrapping machine, performing anti-caking treatment and packaging to obtain the multi-element nitrogen-potassium topdressing high-tower compound fertilizer with the granularity of 2-4.5 mm. The product contains 30.19-10.11% of N-K2O, contains trace elements and biological bacteria in S, Zn, Ca, Mg and Mn, contains 0.7% of water and 38N of strength, and has smooth and round particles.
Example 2: the product proportion is 30-12, taking the consumption quota of 1 ton of product raw materials as an example:
Figure BSA0000207494140000051
Figure BSA0000207494140000061
the specific production flow is as follows:
(1) ammoniation of medium and trace elements (for spare)
8 kg of measured ammonium bicarbonate (containing 17% of N and the same mass percentage as below), 20 kg of zinc sulfate (containing S and Zn), 35 kg of calcium sulfate (containing S and Ca), 15 kg of magnesium sulfate (containing S and Mg) and 10 kg of ferrous sulfate (containing S and Fe) are added into a mixing stirrer and stirred uniformly for 6 min. The stirred mixed material enters a drying ammoniation machine, the temperature of gas at the outlet of the drying machine is controlled at 45 ℃, the drying ammoniation time is 30min, and the water content of the material is controlled below 1%;
(2) 590 kilograms of metered urea (containing 46.2 percent of N) is added into a melting tank, the temperature of the melting tank is controlled at 120 ℃, and the melted urea solution overflows to a first-stage mixing tank;
(3) adding 107 kg of metered ammonium chloride (containing 25.2 percent of N) into a primary mixing tank, uniformly mixing with a urea solution by stirring, controlling the temperature of the primary mixing tank at 110 ℃, and overflowing the mixed molten material into a secondary mixing tank;
(4) adding 195 kg of measured potassium chloride (containing K2O 62%) and the ammoniated medium trace elements in the step (1) into a secondary mixing tank, uniformly mixing with the molten material by stirring, controlling the temperature of the secondary mixing tank at 100 ℃, and mixing with the molten material for 4min to obtain mixed molten slurry;
(5) emulsifying the mixed and melted slurry by an emulsifying machine to prepare slurry with good flowing property, completing spray granulation in a granulation tower by using a differential granulator, naturally cooling in the granulation tower, and controlling the temperature of material particles below the tower at 65 ℃;
(6) and respectively carrying out coarse screening and fine screening on material particles below the tower, returning the screened particles with the particle size of more than 4.5mm and the screened particles with the particle size of less than 2.0mm to a primary mixing tank, and feeding qualified products into a cooling machine.
(7) Spraying 13 kg of prepared nitrogen-fixing bacteria and 7 kg of prepared phosphorus-dissolving bacteria onto material particles in an atomizing manner at the inlet of a cooling machine, and then cooling for 30 min;
(8) and (4) feeding the cooled qualified product into a wrapping machine, performing anti-caking treatment and packaging to obtain the multi-element nitrogen-potassium topdressing high-tower compound fertilizer with the granularity of 2-4.5 mm. The product contains 30.10-12.19% of N-K2O, contains trace elements and biological bacteria in S, Zn, Ca, Mg and Fe, contains 0.6% of water and 40N 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 (4)

1. The multi-element nitrogen-potassium topdressing high-tower compound fertilizer is characterized in that urea accounts for 52-62% of the total input raw material amount by mass, potassium chloride accounts for 15-22% of the total input raw material amount by mass, ammonium chloride accounts for 10-18% of the total input raw material amount by mass, ammonium bicarbonate accounts for 0.6-1.2% of the total input raw material amount by mass, medium trace elements account for 6-12% of the total input raw material amount by mass, and biological bacteria accounts for 1-3% of the total input raw material amount by mass.
The preparation method of the multi-element nitrogen-potassium topdressing high-tower compound fertilizer comprises the following steps:
(1) ammoniation of medium and trace elements (for spare)
1.1 mixing materials: adding metered ammonium bicarbonate and medium trace elements into a mixing stirrer, and uniformly stirring for 6-7 min;
1.2, drying and ammoniation: the mixed material enters a drying ammoniation machine, ammoniation and drying treatment of medium trace elements are completed by utilizing the drying temperature, the temperature of gas at the outlet of the drying machine is controlled to be 45-50 ℃, the drying ammoniation time is 30-35min, and the water content of the material is controlled to be below 1%;
(2) adding metered urea into a melting tank, controlling the temperature of the melting tank to be 120-125 ℃, and overflowing the melted urea solution into a primary mixing tank;
(3) adding metered ammonium chloride into a primary mixing tank, uniformly mixing the ammonium chloride with a urea solution, controlling the temperature of the primary mixing tank to be 110-115 ℃, and overflowing the mixed molten material into a secondary mixing tank;
(4) adding potassium chloride and the ammoniated medium trace elements in the step (1) into a secondary mixing tank in a metering manner, and mixing the potassium chloride and the ammoniated medium trace elements with a molten material for less than 5min to obtain mixed molten slurry, wherein the temperature of the secondary mixing tank is controlled to be 100-105 ℃;
(5) emulsifying the mixed melted slurry by an emulsifying machine, completing spray granulation in a granulation tower by using a differential granulator, and naturally cooling in the granulation tower, wherein the temperature of material particles below the tower is less than 70 ℃;
(6) respectively carrying out coarse screening and fine screening on material particles below the tower, 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, the screened particles with the diameter of more than 4.5mm and the screened particles with the diameter of less than 2.0mm return to a primary mixing tank, and qualified products enter a cooling machine;
(7) spraying the prepared biological bacterial liquid onto qualified products at the inlet of a cooling machine in an atomizing mode, and rapidly sucking the biological bacterial liquid by utilizing the temperature of the biological bacterial liquid, wherein the cooling time is 30-35 min;
(8) and (4) feeding the cooled qualified product into a wrapping machine, and packaging after anti-caking treatment.
2. The multi-element nitrogen-potassium topdressing high-tower compound fertilizer as claimed in claim 1, wherein the mass ratio of ammonium bicarbonate/medium trace elements is 1: 10.
3. The multi-element nitrogen-potassium topdressing high-tower compound fertilizer as claimed in claim 1, wherein the medium trace-element substance is a combination of zinc sulfate, calcium sulfate, magnesium sulfate, manganese sulfate and ferrous sulfate.
4. The multi-element nitrogen-potassium topdressing high-tower compound fertilizer as claimed in claim 1, wherein the biological bacteria are two combinations of nitrogen-fixing bacteria and phosphate-removing bacteria.
CN202010347502.7A 2020-04-23 2020-04-23 Multi-element nitrogen-potassium topdressing high-tower compound fertilizer and preparation method thereof Withdrawn CN111559944A (en)

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Application publication date: 20200821