CN113929533A - Method and device for preparing urea containing chelated potassium and zinc - Google Patents
Method and device for preparing urea containing chelated potassium and zinc Download PDFInfo
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- CN113929533A CN113929533A CN202111411464.8A CN202111411464A CN113929533A CN 113929533 A CN113929533 A CN 113929533A CN 202111411464 A CN202111411464 A CN 202111411464A CN 113929533 A CN113929533 A CN 113929533A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000004202 carbamide Substances 0.000 title claims abstract description 101
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052700 potassium Inorganic materials 0.000 title claims abstract description 36
- 239000011591 potassium Substances 0.000 title claims abstract description 36
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000011701 zinc Substances 0.000 title claims abstract description 29
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 12
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000003860 storage Methods 0.000 claims abstract description 45
- 238000005469 granulation Methods 0.000 claims abstract description 25
- 230000003179 granulation Effects 0.000 claims abstract description 24
- 238000001704 evaporation Methods 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 230000008020 evaporation Effects 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000000049 pigment Substances 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 14
- 239000013522 chelant Substances 0.000 claims description 13
- 229940038879 chelated zinc Drugs 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 235000013399 edible fruits Nutrition 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000001056 green pigment Substances 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 108010064470 polyaspartate Proteins 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 4
- 235000013877 carbamide Nutrition 0.000 description 81
- 239000000243 solution Substances 0.000 description 24
- NFVZIERLAZUYBQ-UHFFFAOYSA-N [K].[Zn] Chemical compound [K].[Zn] NFVZIERLAZUYBQ-UHFFFAOYSA-N 0.000 description 16
- 239000000047 product Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000008187 granular material Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 229920001184 polypeptide Polymers 0.000 description 2
- 108090000765 processed proteins & peptides Proteins 0.000 description 2
- 102000004196 processed proteins & peptides Human genes 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229930192334 Auxin Natural products 0.000 description 1
- 244000248349 Citrus limon Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 235000000177 Indigofera tinctoria Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 239000002363 auxin Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229940097275 indigo Drugs 0.000 description 1
- COHYTHOBJLSHDF-UHFFFAOYSA-N indigo powder Natural products N1C2=CC=CC=C2C(=O)C1=C1C(=O)C2=CC=CC=C2N1 COHYTHOBJLSHDF-UHFFFAOYSA-N 0.000 description 1
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
Abstract
A urea preparation method and device containing chelated potassium and zinc relate to the technical field of urea preparation, and the technical scheme adopted by the preparation method comprises S1 batching, S2 storing and S3 uniformly mixing; preparation facilities includes evaporation system and granulation equipment, evaporation system includes molten urea liquid storage tank, U type pipe, proportioning tank and stock chest, the proportioning tank is through first pipe connection to the stock chest, the stock chest is through second pipe connection to the U type pipe, U type pipe passes through pipe connection to granulation equipment, first pipeline is provided with the delivery pump, the second pipeline is provided with the measuring pump, molten urea liquid storage tank is provided with the observation window, proportioning tank and stock chest top all are provided with the agitator, and the bottom all is provided with the heater. The invention can avoid the phenomena of pipeline blockage and pump cavitation, reduce the number of other products and reduce the cost of material loss.
Description
Technical Field
The invention relates to the technical field of urea preparation, in particular to a method and a device for preparing urea containing chelated potassium and zinc.
Background
The urea is a nitrogen fertilizer commonly used in modern agriculture, and as the common urea has high usage amount, easy loss and low utilization rate, a plurality of novel synergistic ureas are researched and developed on the basis of the common urea, and the polypeptide chelated salt urea belongs to a new product, contains trace elements, polypeptide amino acids and nitrogen elements required by plants, can be absorbed by the plants, improves the absorption effect of nutrient substances, and has higher added value.
However, in the existing preparation process, workers operate equipment according to experience and operating rules, whether the synergist and the molten urea liquid product are mixed evenly or not cannot be directly judged, the number of produced off-grade products is large, and under the condition that production conditions change, the operating rules need to be readjusted, so that inconvenience is brought to production; meanwhile, the problems that pipelines for conveying the synergist are easy to block, a conveying pump is easy to generate cavitation phenomena and the like exist, and the production efficiency is extremely influenced.
Disclosure of Invention
Aiming at the problems of large quantity of external products and the like in the prior art, the invention provides a method and a device for preparing urea containing chelated potassium and zinc.
The invention provides the following technical scheme: a preparation method of urea containing chelated potassium and zinc comprises the following steps:
s1, adding a synergist and a pigment into the batching tank and uniformly stirring, wherein the synergist is a mixed aqueous solution of polyaspartic acid chelated zinc and polyaspartic acid chelated potassium, and the mixed aqueous solution contains chelated potassium 16wt%Containing chelates ofZinc 26wt%The mass ratio of the synergist to the pigment is 1000: 11;
s2, stopping stirring after the ingredients are mixed, transferring the ingredients to a storage tank, and keeping the liquid level in the storage tank at 2000mmContinuously stirring and keeping the temperature; if the liquid level is below 2000mmStopping stirring until the liquid level rises to 2000mmThe above;
s3, conveying the liquid in the storage tank into an evaporation system, mixing the liquid with molten urea liquid to obtain a mixture, wherein the mass ratio of the synergist to the molten urea liquid is 4:1000, observing that the color of the pigment in the mixture is uniformly and stably distributed, and then conveying the mixture into a granulation device for granulation to obtain a urea product with the color of the pigment.
Preferably, in step S1, the pigment is a solid fruit green pigment.
Preferably, in the steps S1 and S2, the stirring temperature in the batching tank and the storage tank is 55-65 DEG℃。
Preferably, in step S3, the color distribution of the mixture is observed to be uniform and stable for at least 3 minutes, and then the mixture is sent to a granulating device for granulation.
Preferably, in step S3, before the mixture is sent to a granulating device, the mass fraction of water in the mixture is 0.5-3%.
Preferably, in step S3, the chelated potassium content per kilogram of urea product is more than or equal to 620mgChelated zinc is more than or equal to 1030mg。
The utility model provides a urea preparation facilities who contains chelate potassium, zinc, includes evaporation system and granulation equipment, evaporation system include molten urea liquid storage tank and with the U type pipe of molten urea liquid storage tank intercommunication still includes proportioning bin and stock chest, the proportioning bin is through first pipe connection to the stock chest, the stock chest passes through the second pipe connection to the U type pipe, the U type pipe passes through pipe connection to granulation equipment, first pipeline is provided with the delivery pump, the second pipeline is provided with the measuring pump, molten urea liquid storage tank is provided with the observation window, proportioning bin and stock chest top all are provided with the agitator, and the bottom all is provided with the heater.
Preferably, the batching tank and the storage tank are both provided with liquid level meters.
Preferably, the granulation apparatus is a granulator or a granulation tower.
The invention has the beneficial effects that: the preparation method provided by the invention has the advantages that the ratio of the chelated potassium, zinc and urea is reasonable, the operation is easy, the product quality is stable, the trace elements can be supplemented to crops, and the crop yield is improved; in production, proper stirring temperature and liquid level are adopted, so that the phenomena of pipeline blockage and pump cavitation are avoided; after the synergist added with the pigment is added into the molten urea solution, whether the synergist is uniformly mixed with the molten urea solution or not can be judged visually according to the distribution condition of the pigment, so that the number of other products is reduced, and the cost of material loss is reduced.
Drawings
FIG. 1 is a schematic view of an embodiment of a production apparatus in the present invention.
Reference numerals: 1-U-shaped pipe, 2-batching tank, 3-material storage tank, 4-delivery pump, 5-metering pump, 6-granulation equipment and 7-tank car.
Detailed Description
The embodiments of the present invention will be described in more detail with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement the embodiments of the present invention after studying the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides a preparation method of urea containing chelated potassium and zinc, which comprises the following steps:
s1, adding 100 into a dosing tankkgThe potassium-zinc chelate synergist (a commercial raw material) comprises 16 mass percent of potassium chelate and 26 mass percent of zinc chelate, and is heated to 55 mass percent by using a steam heating coil℃Then, 1.1 part of the solution was addedkgThe solid fruit green pigment is uniformly stirred by a stirrer, so that the mass ratio of the chelating potassium zinc synergist to the pigment reaches 1000: 11. The stirring temperature is 55-65 DEG℃In the interval, the solubility of the solid fruit green pigment is optimal; if the stirring temperature is not within this range, the pigment is liable to precipitate crystals or be producedBy-products are generated, and the situation that the addition amount is unstable and even the pipeline is blocked can occur in the production; the stirring temperature exceeds 65 DEG C℃And then, the fruit green element is easy to volatilize, so that the color becomes light, and the metering pump can generate a vaporization phenomenon to cause inaccurate metering.
S2, after the batching is finished, the mixed liquid in the batching tank is transferred to a storage tank through a delivery pump, so that the liquid level in the storage tank is kept at 2000mmThe temperature is maintained at 55 deg.C by means of a heater such as a steam heating coil℃Continuing stirring; liquid level below 2000mmIn the process, the chelating potassium zinc synergist generates bubbles due to stirring at a low liquid level to cause frequent vaporization of the pump in the operation process, and the stirring needs to be stopped until the liquid level returns to 2000mm。
S3, the molten urea liquid in the evaporation system is in a circulating flow state, wherein the mass of the urea is 5000kg. 20.22 by using a metering pumpkgThe mixed liquid of the chelating potassium zinc synergist and the pigment is pumped into a U-shaped pipe from a storage tank and is mixed with the molten urea liquid, so that the mass ratio of the synergist to the molten urea liquid reaches 4: 1000. The temperature of the molten urea solution causes the pigment to volatilize, but the evaporation system is in a closed state, and even when the pigment volatilizes, the pigment is mixed with the flowing molten urea solution. The molten urea solution is gradually and uniformly mixed with the chelating potassium zinc synergist and the pigment in a circulating state, and the molten urea solution starts to change color after the mixed solution is added, so that a dark green homogenized liquid is finally formed, and the color is not changed any more. When the worker observes the color stability of the molten urea solution from the observation window on the molten urea solution storage tank 3minAnd after the mass fraction of the water content is reduced to below 3 percent, feeding the molten urea solution into a granulator through a melting pump for granulation to finally obtain green urea granules with uniform color, wherein the content of chelated potassium in each kilogram of green urea granules is not less than 620mgThe content of chelated zinc is more than or equal to 1030mg. If the mixed liquid and the molten urea liquid are not uniformly mixed and then granulation is carried out, the situation that white urea particles and green urea particles are mixed can occur, the content of chelated potassium and zinc in the white urea particles is low, and the white urea particles are external products and do not meet the product quality standard.
Example 2
The invention provides a preparation method of urea containing chelated potassium and zinc, which comprises the following steps:
s1, adding 150 parts into a dosing tankkgThe potassium-zinc chelate synergist (a commercial raw material) comprises 16 mass percent of potassium chelate and 26 mass percent of zinc chelate, and the synergist is heated to 60 mass percent by using a steam heating coil℃Then, 1.65 of the solution was addedkgThe solid lemon yellow pigment is uniformly stirred by a stirrer, so that the mass ratio of the chelating potassium zinc synergist to the pigment reaches 1000: 11.
S2, after the batching is finished, the mixed liquid in the batching tank is transferred to a storage tank through a delivery pump, so that the liquid level in the storage tank is kept at 2100mmThe temperature is maintained at 60 deg.C by means of a heater such as a steam heating coil℃And continuing stirring.
S3, the molten urea liquid in the evaporation system is in a circulating flow state, wherein the mass of the urea is 5000kg. 20.22 by using a metering pumpkgThe mixed liquid of the chelating potassium zinc synergist and the pigment is pumped into a U-shaped pipe from a storage tank and is mixed with the molten urea liquid, so that the mass ratio of the synergist to the molten urea liquid reaches 4: 1000. The molten urea solution is gradually and uniformly mixed with the chelating potassium zinc synergist and the pigment in a circulating state, and the molten urea solution starts to change color after the mixed solution is added, so that a yellow homogenized liquid is finally formed, and the color is not changed any more. When the worker observes the color stability of the molten urea solution from the observation window on the molten urea solution storage tank 4minAnd after the mass fraction of the water content is reduced to below 2%, feeding the molten urea solution into a granulator through a melting pump for granulation to finally obtain yellow urea granules with uniform color, wherein the content of chelated potassium in each kilogram of yellow urea granules is not less than 620mgThe content of chelated zinc is more than or equal to 1030mg。
Example 3
The invention provides a preparation method of urea containing chelated potassium and zinc, which comprises the following steps:
s1, adding 200 into a dosing tankkgA potassium-zinc chelate synergist (a commercially available raw material), wherein the mass fraction of potassium chelate in the potassium-zinc chelate synergist is 16 percent, the mass fraction of zinc chelate is 26 percent,heating the synergist to 65 deg.C by steam heating coil℃Then, 2.2 ofkgThe solid indigo pigment is uniformly stirred by a stirrer, so that the mass ratio of the chelating potassium-zinc synergist to the pigment reaches 1000: 11.
S2, after the batching is finished, the mixed liquid in the batching tank is transferred to a storage tank through a delivery pump, so that the liquid level in the storage tank is kept at 2200mmThe temperature is maintained at 65 deg.C by means of a heater such as a steam heating coil℃And continuing stirring.
S3, the molten urea liquid in the evaporation system is in a circulating flow state, wherein the mass of the urea is 5000kg. 20.22 by using a metering pumpkgThe mixed liquid of the chelating potassium zinc synergist and the pigment is pumped into a U-shaped pipe from a storage tank and is mixed with the molten urea liquid, so that the mass ratio of the synergist to the molten urea liquid reaches 4: 1000. The molten urea solution is gradually and uniformly mixed with the chelating potassium zinc synergist and the pigment in a circulating state, and the molten urea solution starts to change color after the mixed solution is added, so that a blue homogenized liquid is finally formed, and the color is not changed any more. When the color of the molten urea solution is stably maintained 5 as observed from the observation window on the molten urea solution storage tank by a workerminAnd after the mass fraction of the water content is reduced to below 1 percent, feeding the molten urea solution into a granulator through a melting pump for granulation to finally obtain blue urea granules with uniform color, wherein the content of chelated potassium in each kilogram of yellow urea granules is not less than 620mgThe content of chelated zinc is more than or equal to 1030mg。
The invention also provides a urea preparation device containing chelated potassium and zinc as shown in figure 1, which comprises an evaporation system and granulation equipment 6, wherein the evaporation system comprises a molten urea liquid storage tank and a U-shaped pipe 1 communicated with the molten urea liquid storage tank, the urea preparation device also comprises a batching tank 2 and a storage tank 3, the batching tank 2 is connected to the storage tank 3 through a first pipeline, the storage tank 3 is connected to the U-shaped pipe 1 through a second pipeline, the U-shaped pipe 1 is connected to the granulation equipment 6 through a pipeline, the first pipeline is provided with a delivery pump 4, the second pipeline is provided with a metering pump 5, the molten urea liquid storage tank is provided with an observation window, the tops of the batching tank 2 and the storage tank 3 are both provided with a stirrer, and the bottoms of the batching tank 2 and the storage tank 3 are both provided with a heater. The potassium-zinc chelate synergist purchased from the market is transported by using a tank wagon 7, the tank wagon 7 is connected to a delivery pump 4, a batching tank 2 is driven into by the delivery pump 4, a stop valve is arranged on a pipeline connected with the front and the back of the delivery pump 4, and the flow direction is controlled by a switch of the stop valve.
An evaporation system, granulation equipment, a molten urea liquid storage tank and a U-shaped pipe are equipment on a urea production line in the prior art. The evaporation system is mainly used for evaporating and separating the moisture content in the molten urea solution; the granulation equipment is used for granulation, and can adopt a granulator or a granulation tower; the observation window is used for observing the state of the molten urea in the molten urea storage tank; the U-shaped pipe is communicated with the molten urea liquid storage tank, and the mixed liquid enters the molten urea liquid storage tank from the U-shaped pipe and is mixed with the molten urea liquid. The batching tank is used for mixing the chelated potassium-zinc synergist and the pigment, and the storage tank is used for storing the prepared mixed liquid for later use; the metering pump can adjust the dosage of the mixed liquid input into the U-shaped pipe; the heater can adopt a steam heater with a PID temperature control system, and further, the first pipeline and the second pipeline can be provided with steam accompanying pipes for heat preservation.
Preferably, the dosing tank 2 and the storage tank 3 are both provided with level gauges for detecting the liquid level.
The preparation method provided by the invention has the advantages that the proportion of the chelated potassium, the zinc and the urea is reasonable, the zinc and the potassium are supplemented simultaneously, the formation of auxin in crops can be promoted, the trace elements are increased, and the preparation method also has the effects of reducing the loss of the fertilizer and improving the utilization rate of the fertilizer. In production, proper stirring temperature and liquid level are adopted, so that the phenomena of pipeline blockage and pump cavitation are avoided; after the synergist added with the pigment is added into the molten urea solution, whether the synergist is uniformly mixed with the molten urea solution or not can be judged visually according to the distribution condition of the pigment, so that the number of other products is reduced, and the cost of material loss is reduced.
The foregoing is a detailed description of one or more embodiments of the invention, which is set forth in more detail and is not intended to limit the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for preparing urea containing chelated potassium and zinc is characterized in that: comprises the following steps
S1, adding a synergist and a pigment into the batching tank and uniformly stirring, wherein the synergist is a mixed aqueous solution of polyaspartic acid chelated zinc and polyaspartic acid chelated potassium, and the mixed aqueous solution contains chelated potassium 16wt%Containing chelated zinc 26wt%The mass ratio of the synergist to the pigment is 1000: 11;
s2, stopping stirring after the ingredients are mixed, transferring the ingredients to a storage tank, and keeping the liquid level in the storage tank at 2000mmContinuously stirring and keeping the temperature; if the liquid level is below 2000mmStopping stirring until the liquid level rises to 2000mmThe above;
s3, conveying the liquid in the storage tank into an evaporation system, mixing the liquid with molten urea liquid to obtain a mixture, wherein the mass ratio of the synergist to the molten urea liquid is 4:1000, observing that the color of the pigment in the mixture is uniformly and stably distributed, and then conveying the mixture into a granulation device for granulation to obtain a urea product with the color of the pigment.
2. The method for preparing urea containing chelated potassium and zinc according to claim 1, characterized in that: in step S1, the pigment is a solid fruit green pigment.
3. The method for preparing urea containing chelated potassium and zinc according to claim 1, characterized in that: in steps S1 and S2, the stirring temperature in the batching tank and the storage tank is 55-65 DEG℃。
4. The method for preparing urea containing chelated potassium and zinc according to claim 1, characterized in that: in step S3, the color distribution of the mixture is observed to be uniform and stable for at least 3 minutes, and then the mixture is sent to a granulating device for granulation.
5. The method for preparing urea containing chelated potassium and zinc according to claim 1, characterized in that: in step S3, before the mixture is sent to a granulating device, the mass fraction of water in the mixture is 0.5-3%.
6. The method for preparing urea containing chelated potassium and zinc according to claim 1, characterized in that: in step S3, the chelated potassium content per kilogram of urea product is more than or equal to 620mgChelated zinc is more than or equal to 1030mg。
7. A urea preparation facilities who contains chelate potassium, zinc, includes evaporating system and granulation equipment, evaporating system includes molten urea liquid storage tank and with U type pipe (1) of molten urea liquid storage tank intercommunication, its characterized in that: still include proportioning tank (2) and stock chest (3), proportioning tank (2) are connected to through first pipe connection stock chest (3), second pipe connection is passed through in stock chest (3) U type pipe (1), U type pipe (1) is connected to granulation equipment through the pipeline, first pipeline is provided with delivery pump (4), the second pipeline is provided with measuring pump (5), the molten urea liquid storage tank is provided with the observation window, proportioning tank (2) and stock chest (3) top all are provided with the agitator, and the bottom all is provided with the heater.
8. The apparatus for preparing urea containing chelated potassium and zinc as claimed in claim 7, wherein: the proportioning tank (2) and the storage tank (3) are both provided with liquid level meters.
9. The apparatus for preparing urea containing chelated potassium and zinc as claimed in claim 7, wherein: the granulating equipment (6) is a granulator or a granulating tower.
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