CN210457985U - Preparation system for calcium magnesium ammonium nitrate fertilizer - Google Patents
Preparation system for calcium magnesium ammonium nitrate fertilizer Download PDFInfo
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- CN210457985U CN210457985U CN201921124915.8U CN201921124915U CN210457985U CN 210457985 U CN210457985 U CN 210457985U CN 201921124915 U CN201921124915 U CN 201921124915U CN 210457985 U CN210457985 U CN 210457985U
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Abstract
The utility model relates to a preparation system for ammonium nitrate calcium magnesium is fertile, including first retort, second retort, adsorption equipment, pressure filter and evaporation prilling granulator. The first reaction tank is used for mixing and reacting waste nitric acid and calcium-magnesium-containing substances to form a calcium-magnesium nitrate mixed solution; the second reaction tank is communicated with the first reaction tank and is used for mixing and reacting the calcium magnesium nitrate mixed solution with ammonia water to obtain a calcium magnesium ammonium nitrate mixed solution; the adsorption device is communicated with the second reaction tank and is used for carrying out adsorption treatment on the calcium magnesium ammonium nitrate mixed solution so as to adsorb heavy metal ions in the calcium magnesium ammonium nitrate mixed solution; the filter press is communicated with the adsorption device and is used for carrying out filter pressing treatment on the calcium magnesium ammonium nitrate mixed solution; the evaporation granulation device is communicated with the filter press and is used for carrying out evaporation treatment and granulation treatment on the calcium magnesium ammonium nitrate mixed solution in sequence to form calcium magnesium ammonium nitrate granules. Nitric acid and heavy metal ions in the waste nitric acid are respectively recovered, and the nitric acid is recycled.
Description
Technical Field
The utility model relates to a chemical fertilizer production facility technical field especially relates to a preparation system for calcium magnesium ammonium nitrate is fertile.
Background
Nitric acid is an important chemical raw material, and is widely used in the fields of chemical industry, ferrous metallurgy, electronics, electroplating, pesticides and the like, for example, in the steel industry, pickling and polishing, in the electronics industry, tin stripping and cleaning, in the electroplating industry, for removing oxides, removing rust, passivating films and the like. However, after the nitric acid is acted, waste nitric acid containing part of heavy metal ions is generated, the waste nitric acid has strong corrosivity, belongs to dangerous waste and cannot be directly discharged, and when the waste nitric acid is recycled, the heavy metal ions and the nitric acid need to be respectively recycled. At present, the domestic method for treating the waste nitric acid cannot effectively recover heavy metal ions and nitric acid respectively.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a preparation system for calcium magnesium ammonium nitrate fertilizer, which can effectively recover heavy metal ions and recycle nitric acid, aiming at the problem that the existing method for treating waste nitric acid cannot effectively recover heavy metal ions and nitric acid respectively.
A preparation system for a calcium magnesium ammonium nitrate fertilizer comprises:
the first reaction tank is used for mixing and reacting the waste nitric acid and the calcium-magnesium containing substance;
the input port of the second reaction tank is communicated with the output port of the first reaction tank, and the second reaction tank is used for mixing and reacting the solution conveyed to the second reaction tank from the first reaction tank with ammonia water;
an input port of the adsorption device is communicated with an output port of the second reaction tank, and the adsorption device is used for removing heavy metal ions in the solution entering the adsorption device;
the input port of the filter press is communicated with the output port of the adsorption device;
and the evaporation granulation device is communicated with the output port of the filter press and is used for sequentially carrying out evaporation treatment and granulation treatment on the solution entering the evaporation granulation device.
By arranging the preparation system for the calcium magnesium ammonium nitrate fertilizer, waste nitric acid and calcium magnesium-containing substances are placed in the first reaction tank for mixed reaction to form a calcium magnesium nitrate mixed solution, then the calcium magnesium nitrate mixed solution is conveyed to the second reaction tank, ammonia water is added into the second reaction tank for mixed reaction to obtain the calcium magnesium ammonium nitrate mixed solution, then the calcium magnesium ammonium nitrate mixed solution is sequentially subjected to adsorption treatment of an adsorption device and filter pressing treatment of a filter press to obtain the calcium magnesium ammonium nitrate mixed solution, and finally the calcium magnesium ammonium nitrate mixed solution is treated by an evaporation granulation device to obtain calcium magnesium ammonium nitrate particles.
In addition, heavy metal ions in the waste nitric acid are contained in the mixed solution before entering the adsorption device, after the adsorption device performs adsorption treatment, the heavy metal ions in the waste nitric acid are adsorbed, and the rest mixed solution can continue to perform subsequent treatment. Therefore, nitric acid and heavy metal ions in the waste nitric acid are respectively recovered, and nitric acid in the waste nitric acid is finally converted into calcium magnesium ammonium nitrate fertilizer, so that the nitric acid and the heavy metal in the waste nitric acid are recycled, pollution of the nitric acid and the heavy metal in the waste nitric acid is avoided, the aim of changing waste into valuables is fulfilled, and the method has good economic benefit and environmental benefit and is beneficial to large-scale popularization.
In one embodiment, the preparation system further comprises a first storage tank for storing the waste nitric acid, and an output port of the first storage tank is communicated with the first reaction tank.
In one embodiment, the preparation system further comprises a first delivery pump disposed in the first storage tank for providing power for delivering the waste nitric acid in the first storage tank to the first reaction tank.
In one embodiment, the preparation system further comprises a crusher, and the discharge port of the crusher is communicated with the first reaction tank.
In one embodiment, the preparation system further comprises a centrifugal filter, and an input port and an output port of the centrifugal filter are respectively communicated with an output port of the first reaction tank and an input port of the second reaction tank.
In one embodiment, the preparation system further comprises a gas storage tank, and the gas storage tank is respectively communicated with the first reaction tank and the second reaction tank and is used for obtaining gas generated by reaction in the first reaction tank and the second reaction tank.
In one embodiment, the preparation system further comprises a second storage tank for storing the ammonia water, and an output port of the second storage tank is communicated with the second reaction tank.
In one embodiment, the adsorption device comprises a clarification tank, and the output port of the second reaction tank is communicated with the clarification tank.
In one embodiment, the adsorption device further comprises a material storage ball for storing the heavy metal adsorbent, and a discharge port of the material storage ball is communicated with the clarifying tank.
In one embodiment, the evaporation granulation device comprises an evaporator and a granulator which are communicated with each other, the inlet of the evaporator is communicated with the outlet of the filter press, the inlet of the granulator is communicated with the outlet of the evaporator, and the granulator is used for granulating the solution conveyed to the granulator by the evaporator.
Drawings
Fig. 1 is a schematic structural diagram of a preparation system for calcium magnesium ammonium nitrate fertilizer according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a system 10 for preparing a calcium magnesium ammonium nitrate fertilizer according to an embodiment of the present invention includes a first reaction tank 12, a second reaction tank 14, an adsorption device 16, a filter press 18, and an evaporation granulation device 19.
The first reaction tank 12 is used for mixing and reacting waste nitric acid and calcium-containing magnesium substances to form a calcium magnesium nitrate mixed solution, and an input port of the second reaction tank 14 is communicated with an output port of the first reaction tank 12 and used for mixing and reacting the solution conveyed from the first reaction tank 12 to the second reaction tank 14 with ammonia water, that is, the calcium magnesium nitrate mixed solution and the ammonia water are mixed and reacted to obtain the calcium magnesium ammonium nitrate mixed solution.
An input port of the adsorption device 16 is communicated with an output port of the second reaction tank 14, and the adsorption device 16 is used for taking out heavy metal ions in the solution entering the adsorption device 16, specifically for performing adsorption treatment on the calcium magnesium ammonium nitrate mixed solution to adsorb the heavy metal ions in the calcium magnesium ammonium nitrate mixed solution.
An input port of the filter press 18 is communicated with an output port of the adsorption device 16, and is used for carrying out filter pressing treatment on the ammonium nitrate calcium magnesium mixed solution after adsorption treatment.
The evaporation granulation device 19 is communicated with an output port of the filter press 18, and is used for sequentially performing evaporation treatment and granulation treatment on the solution entering the evaporation granulation device, namely the filter-pressed calcium magnesium ammonium nitrate mixed solution, so as to form calcium magnesium ammonium nitrate particles.
By arranging the preparation system for the calcium magnesium ammonium nitrate fertilizer, waste nitric acid and calcium magnesium-containing substances are placed in the first reaction tank 12 to perform mixed reaction to form a calcium magnesium nitrate mixed solution, then the calcium magnesium nitrate mixed solution is conveyed to the second reaction tank 14, ammonia water is added into the second reaction tank 14 to perform mixed reaction to obtain the calcium magnesium ammonium nitrate mixed solution, then the calcium magnesium ammonium nitrate mixed solution is sequentially subjected to adsorption treatment by the adsorption device 16 and filter pressing treatment by the filter press 18 to obtain the calcium magnesium ammonium nitrate mixed solution, and finally the calcium magnesium ammonium nitrate mixed solution is treated by the evaporation granulation device 19 to obtain calcium magnesium ammonium nitrate particles.
In addition, the heavy metal ions in the waste nitric acid are contained in the mixed solution until the waste nitric acid enters the adsorption device 16, the heavy metal ions in the waste nitric acid are adsorbed after the adsorption treatment is performed by the adsorption device 16, and the remaining mixed solution can be continuously subjected to the subsequent treatment. Therefore, nitric acid and heavy metal ions in the waste nitric acid are respectively recovered, and nitric acid in the waste nitric acid is finally converted into calcium magnesium ammonium nitrate fertilizer, so that the nitric acid and the heavy metal in the waste nitric acid are recycled, pollution of the nitric acid and the heavy metal in the waste nitric acid is avoided, the aim of changing waste into valuables is fulfilled, and the method has good economic benefit and environmental benefit and is beneficial to large-scale popularization.
The chemical formula of calcium magnesium ammonium nitrate is 6Ca (NO)3)2NH4·NO3·3Mg(NO3)2·34H2O is a double salt, and at least two metal ions and/or ammonium ions and the same acid radical ion form salt, so that excessive waste nitric acid should be added into the first reaction tank 12, the calcium-magnesium nitrate mixed solution after the reaction contains unreacted nitric acid, and excessive ammonia water is added into the second reaction tank 14 to exhaust the residual nitric acid.
It will be understood that the communication between the above-mentioned devices or apparatuses may be through a connecting pipe, or through other means, as long as the substance transportation is ensured, and of course, the pipe is generally used for transporting liquid medium. For example, the first reaction tank 12 and the second reaction tank 14 are communicated, and the communication mode is not limited as long as the second reaction tank 14 can receive the calcium magnesium nitrate mixed solution generated in the first reaction tank 12.
In some embodiments, the preparation system further comprises a first storage tank 11, an output port of the first storage tank 11 is communicated with the first reaction tank 12, and the first storage tank 11 is used for storing the waste nitric acid. Further, the preparation system further comprises a first delivery pump, which is disposed in the first storage tank 11 and is used for providing power for delivering the waste nitric acid in the first storage tank 11 to the first reaction tank 12. Specifically, the first reaction tank 12 is an acid reaction tank.
In some embodiments, the preparation system further comprises a crusher 13, and a discharge port of the crusher 13 is in communication with the first reaction tank 12 for delivering the calcareous magnesium material to the first reaction tank 12. Specifically, the crusher 13 may be located above the first reaction tank 12, the top of the first reaction tank 12 has an opening, and the discharge port of the crusher 13 corresponds to the opening at the top of the first reaction tank 12.
In some embodiments, the preparation system further comprises a second storage tank 15, an output port of the second storage tank 15 is communicated with the second reaction tank 14, and the second storage tank 15 is used for storing ammonia water. Further, the preparation system further comprises a second delivery pump, and the second delivery pump is arranged in the second storage tank 15 and used for providing power for delivering the ammonia water in the second storage tank 15 to the second reaction tank 14. Specifically, the second reaction tank 14 is a neutralization reaction tank.
It should be noted that in practical applications, many apparatuses are placed relatively horizontally, and therefore the liquid medium is transported by pumping using a transport pump, such as the above-mentioned waste nitric acid and ammonia water. The same is true between other devices and installations.
In some embodiments, the preparation system further comprises a gas storage tank 20, and the gas storage tank 20 is respectively communicated with the first reaction tank 12 and the second reaction tank 14 and is used for acquiring gas generated by the reaction in the first reaction tank 12 and the second reaction tank 14.
It should be noted that a part of the above-mentioned calcareous magnesium-containing material may be formed by crushing the dolomite by the crusher 13, and the main component of the dolomite is CaMg (CO)3)2And the chemical formula of ammonium calcium magnesium nitrate is 6Ca (NO)3)2NH4·NO3·3Mg(NO3)2·34H2O, the ratio of calcium to magnesium in calcium magnesium ammonium nitrate is 2:1, therefore, calcium needs to be supplemented, that is, a substance containing calcium but not containing magnesium needs to be added additionally, and quicklime is used in the embodiment. Wherein CaMg (CO)3)2Carbon dioxide is generated after the reaction with the nitric acid in the waste nitric acid, and the generated carbon dioxide enters the gas holder 20.
In second retort 14, need add excessive aqueous ammonia, and the aqueous ammonia is volatile easily, and the volatile ammonia can enter into gas holder 20, and when only carbon dioxide and ammonia in the gas holder 20, both can not react, and store up water in the gas holder 20, under the condition that has water, carbon dioxide, ammonia and water can produce chemical reaction, generate ammonium bicarbonate/ammonium carbonate aqueous solution, and the aqueous solution that generates can obtain the by-product of ammonium carbonate through evaporation crystallization processing.
Therefore, the first reaction tank 12 and the second reaction tank 14 should ensure the sealing performance during the reaction, the reaction chamber of the first reaction tank 12 needs to seal the opening at the top of the first reaction tank 12, that is, the calcium and magnesium containing substance is added into the first reaction tank 12 first, and then the waste nitric acid is added; the second reaction tank 14 is filled with the calcium magnesium nitrate mixed solution, and then the ammonia water is added.
In some embodiments, the preparation system further comprises a centrifugal filter 17, and an input port and an output port of the centrifugal filter 17 are respectively communicated with the output port of the first reaction tank 12 and the input port of the second reaction tank 14, and are used for performing centrifugal filtration treatment on the calcium magnesium nitrate mixed solution and conveying the calcium magnesium nitrate mixed solution subjected to centrifugal filtration treatment to the second reaction tank 14. Specifically, the centrifugal filter 17 is a flat plate type centrifuge.
It is to be explained that it is possible to determine the nitric acid content of the spent nitric acid and the CaMg (CO) content of the dolomite3)2Adding waste nitric acid, quicklime and dolomite in corresponding proportion according to the molar ratio in the chemical reaction formula so as to lead the quicklime and CaMg (CO)3)2Just after the reaction is exhausted, dolomite will also contain other components that cannot react, thus forming impurities.
In some embodiments, the adsorption device 16 includes a clarifying tank 162, and the output port of the second reaction tank 14 is communicated with the clarifying tank 162, so as to enable the calcium magnesium ammonium nitrate mixed solution to react with the heavy metal adsorbent sufficiently to adsorb heavy metal ions in the calcium magnesium ammonium nitrate mixed solution.
Further, adsorption equipment 16 still includes the storage ball 164 that is used for storing the heavy metal adsorbent, and the bin outlet of storage ball 164 corresponds clarification tank 162 and sets up to add the heavy metal adsorbent in clarification tank 162.
Heavy metal adsorbent can form flocculent precipitate after adsorbing the heavy metal ion in the calcium magnesium ammonium nitrate mixed solution, and in order to guarantee that all heavy metal ion adsorption is accomplished, excessive heavy metal adsorbent need be added, in order to guarantee the purity of the calcium magnesium ammonium nitrate mixed solution that finally enters into evaporation granulation device 19, consequently need carry out the filter-pressing to the calcium magnesium ammonium nitrate mixed solution through adsorption treatment to get rid of flocculent precipitate and excessive heavy metal adsorbent in the calcium magnesium ammonium nitrate mixed solution. Meanwhile, the flocculent precipitate removed by filter pressing is the precipitate of heavy metal ions and can be recovered.
In some embodiments, the evaporation granulation device 19 comprises an evaporator 192, and an input port of the evaporator 192 is communicated with an output port of the filter press 18, and is used for performing evaporation treatment on the filter-pressed calcium magnesium ammonium nitrate mixed solution to remove redundant moisture. Further, the evaporation granulation device 19 further comprises a granulator 194 communicated with an output port of the evaporator 192, and an input port of the granulator 194 is communicated with an output port of the evaporator 192, and the granulator 194 is used for granulating the solution conveyed to the granulator 194. Specifically, the pelletizer 194 is configured to pelletize the evaporated calcium magnesium ammonium nitrate mixed solution to form calcium magnesium ammonium nitrate granules.
In order to facilitate understanding of the technical solution of the present invention, the steps of the preparation system for treating the waste nitric acid in a specific embodiment are described herein:
s110, adding the waste nitric acid, the quicklime and the dolomite into the first reaction tank 12, controlling the reaction temperature to be 60-70 ℃, and stirring at the rotating speed of 200-300 revolutions per minute for 2-3 hours.
Specifically, the molar ratio of the waste nitric acid to the quicklime to the dolomite is 400:9:9, wherein the concentration of the nitric acid in the waste nitric acid is calculated by 10-60 percentWhile CaMg (CO) is contained in dolomite3)2The content of (A) is calculated as 98% -99%.
And S120, conveying the calcium-magnesium nitrate mixed solution obtained after the reaction to a centrifugal filter 17 for centrifugal filtration treatment.
And S130, conveying the calcium magnesium nitrate mixed solution subjected to centrifugal filtration treatment to the second reaction tank 14, and adding ammonia water into the second reaction tank 14.
Specifically, the calcium magnesium nitrate mixed solution and ammonia water are added according to the molar ratio of 8:1 to 10:1 of nitric acid to ammonia water, so that the residual nitric acid in the calcium magnesium nitrate mixed solution is exhausted in reaction, the calcium magnesium ammonium nitrate mixed solution is obtained, and the pH value of the solution after the reaction is 6-8.
And S140, conveying the calcium magnesium ammonium nitrate mixed solution to a clarifying tank 162, and adding the heavy metal adsorbent in the storage ball 164 into the clarifying tank 162 to adsorb the calcium magnesium ammonium nitrate mixed solution.
Further, the clear tank 162 is stirred at a rotation speed of 50 rpm to 200 rpm for 1 hour to 1.5 hours, and is allowed to stand and settle for 2 hours to 3 hours after the stirring is finished.
Specifically, the heavy metal adsorbent, i.e. the heavy metal trapping agent, can react with heavy metal ions, such as copper ions, nickel ions and the like, in the mixed solution of calcium magnesium ammonium nitrate and form flocculent precipitates.
And S150, conveying the mixed solution of calcium, magnesium and ammonium nitrate treated in the step S140 to a filter press 18 for filter pressing treatment.
Specifically, the upper mixed solution after the standing precipitation for 2 to 3 hours is transferred to the filter press 18.
And S160, conveying the mixed solution of calcium and magnesium ammonium nitrate processed in the step S150 to an evaporator 192, and evaporating excessive water until the solution density is 1.2 to 1.6 grams per cubic centimeter.
S170, conveying the solution processed in the step 160 to a granulator 194 for granulation to obtain calcium magnesium ammonium nitrate granules, namely the calcium magnesium ammonium nitrate fertilizer.
Compared with the prior art, the utility model provides a preparation system for ammonium nitrate calcium magnesium fertilizer has following advantage at least:
1) nitric acid and heavy metal ions in the waste nitric acid are respectively recovered, and nitric acid in the waste nitric acid is finally converted into calcium magnesium ammonium nitrate fertilizer, so that the nitric acid and the heavy metal in the waste nitric acid are recycled, pollution of the nitric acid and the heavy metal in the waste nitric acid is avoided, the aim of changing waste into valuables is fulfilled, and the method has good economic benefit and environmental benefit and is beneficial to large-scale popularization.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A preparation system for a calcium magnesium ammonium nitrate fertilizer is characterized by comprising:
the first reaction tank is used for mixing and reacting the waste nitric acid and the calcium-magnesium containing substance;
the input port of the second reaction tank is communicated with the output port of the first reaction tank, and the second reaction tank is used for mixing and reacting the solution conveyed to the second reaction tank from the first reaction tank with ammonia water;
an input port of the adsorption device is communicated with an output port of the second reaction tank, and the adsorption device is used for removing heavy metal ions in the solution entering the adsorption device;
the input port of the filter press is communicated with the output port of the adsorption device;
and the evaporation granulation device is communicated with the output port of the filter press and is used for sequentially carrying out evaporation treatment and granulation treatment on the solution entering the evaporation granulation device.
2. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, further comprising a first storage tank for storing the waste nitric acid, wherein an output port of the first storage tank is communicated with the first reaction tank.
3. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 2, further comprising a first delivery pump disposed in the first storage tank for providing power for delivering the waste nitric acid in the first storage tank to the first reaction tank.
4. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, further comprising a crusher, wherein a discharge port of the crusher is communicated with the first reaction tank.
5. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, further comprising a centrifugal filter, wherein an input port and an output port of the centrifugal filter are respectively communicated with the output port of the first reaction tank and the input port of the second reaction tank.
6. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, further comprising a gas storage tank, wherein the gas storage tank is respectively communicated with the first reaction tank and the second reaction tank and is used for obtaining gas generated by reaction in the first reaction tank and the second reaction tank.
7. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, further comprising a second storage tank for storing the ammonia water, wherein an output port of the second storage tank is communicated with the second reaction tank.
8. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 1, wherein the adsorption device comprises a clarifying tank, and the output port of the second reaction tank is communicated with the clarifying tank.
9. The system for preparing calcium magnesium ammonium nitrate fertilizer as claimed in claim 8, wherein the adsorption device further comprises a storage ball for storing the heavy metal adsorbent, and a discharge port of the storage ball is communicated with the clarifying tank.
10. The system for preparing the calcium-magnesium ammonium nitrate fertilizer as claimed in claim 1, wherein the evaporation granulation device comprises an evaporator and a granulator which are communicated with each other, the inlet of the evaporator is communicated with the outlet of the filter press, the inlet of the granulator is communicated with the outlet of the evaporator, and the granulator is used for granulating the solution conveyed to the granulator by the evaporator.
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| CN201921124915.8U CN210457985U (en) | 2019-07-17 | 2019-07-17 | Preparation system for calcium magnesium ammonium nitrate fertilizer |
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| CN201921124915.8U CN210457985U (en) | 2019-07-17 | 2019-07-17 | Preparation system for calcium magnesium ammonium nitrate fertilizer |
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| CN210457985U true CN210457985U (en) | 2020-05-05 |
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