System for producing ammonium nitrate phosphate fertilizer

Abstract

The utility model discloses a system for producing ammonium nitrate phosphate fertilizer, and belongs to the field of chemical engineering. The system comprises a mixing tank, a mixed acid storage tank, a mixed acid pump, a neutralization tank, a buffer tank, a heater, an evaporator, a slurry storage tank, a slurry pump, a granulation tower and a finished product conveyor. By adopting the system and the method, wet-process phosphoric acid and nitric acid are mixed to obtain mixed acid, the mixed acid enters the neutralization tank for ammonia neutralization, the neutralized slurry enters the natural circulation concentration system for evaporation concentration, and the concentrated slurry is conveyed to the centrifugal sprayer at the upper part of the granulation tower by the slurry pump for granulation and drying; granular ammonium nitrate phosphate at the bottom of the granulation tower is used as a target product, namely the ammonium nitrate phosphate fertilizer, to be debounded. The utility model aims at producing ammonium nitrate phosphate by using wet-process phosphoric acid, nitric acid and ammonia, solving the problems that the ratio of N / P2O5 of an ammonium phosphate fertilizer is too small, nitrate nitrogen is not contained and the fertilizer application requirement of crops is not met, reducing the fertilizer application workload, increasing the crop yield and improving the fertilizer application effect.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to a system for producing ammonium nitrate fertilizer. Background Technology

[0002] Plant growth and development require five essential conditions: light, heat, air, water, and nutrients. The nutrients needed for plant growth are primarily supplied through soil and fertilizer. Based on the three physiological characteristics of essential plant nutrients—1) they directly affect plant growth or metabolism; 2) the lack of any one element prevents normal plant growth and development; and 3) their physiological functions cannot be replaced by other elements—16 essential nutrients for plant growth are defined, including nitrogen (N) and phosphorus (P). Crops containing more than 2% nitrogen (N) and more than 0.4% phosphorus (P) by mass are considered essential. The following crops contain the following percentages of nitrogen (N) and phosphorus (P):

[0003] crop product N％ <![CDATA[P2O5%]]> P％ <![CDATA[N / P2O5 ratio]]> wheat seed 2.7 1.2 0.53 2.25 corn seed 2.6 1.0 0.44 2.6 cotton lint 15 6 2.64 2.5 Millet seed 4.7 1.7 0.75 2.76 soybeans seed 6.5 1.25 0.55 5.2 sorghum seed 5.2 2.7 1.19 1.92 peanut pods 5.8 1 0.44 5.8 tobacco leaf 4.1 1.1 0.48 3.73

[0004] The low levels of available nitrogen (N) and phosphorus (P) in soil often become major factors limiting plant yield, necessitating fertilization to supplement them. Currently produced ammonium phosphate (APP) compound fertilizers are primarily monoammonium phosphate (MAP) and / or diammonium phosphate (DAP). While APP production processes are mature and nutrient content is high, allowing for direct application as fertilizer, its N / P₂O₅ ratio is too low. MAP has a mass ratio of approximately 1:5, and DAP has a mass ratio of approximately 1:2.5, which cannot meet crop requirements. Plants need to absorb various nutrients for growth and development, but the nutrient present in the soil at the lowest relative level to plant needs determines yield. This nutrient is the limiting factor for increased plant yield; without supplementation, even with additional nutrient application, yield will not increase significantly, and the economic benefits of fertilization will be reduced. For example, in nitrogen-deficient soils, even with increased phosphate fertilizer application, yield increases are unlikely.

[0005] Most plants require a relatively large amount of nitrogen fertilizer, but their preferences for the form of nitrogen fertilizer vary. For example, rice prefers ammonium nitrogen (NH4+). + Tobacco prefers nitrate nitrogen (NO3) fertilizer. - China's tobacco planting area is about 20 million mu per year, with an annual output of about 5.8 million tons of unprocessed tobacco, accounting for about one-third of the global total output.

[0006] Because ammonium phosphate contains only ammonium nitrogen (NH4) + It does not contain nitrate nitrogen (NO3) -Ammonium nitrate, however, is prone to explosion upon impact and / or heating and cannot be used alone as a fertilizer. Therefore, it is necessary to improve existing ammonium phosphate production systems and urgently require a new method for producing ammonium-containing nitrogen (NH4). + ) and nitrate nitrogen (NO3) - Systems and methods for developing ammonium nitrate fertilizers that contain phosphorus, have a high N / P2O5 ratio, and can better meet the needs of crops. Utility Model Content

[0007] The purpose of this invention is to provide a system and method for producing ammonium nitrate phosphate fertilizer. The method involves preparing a mixed acid using nitric acid and phosphoric acid, then neutralizing the mixed acid with gaseous ammonia. The neutralized slurry is then concentrated, and the concentrated slurry is sprayed into a granulation tower for granulation. The granulated ammonium nitrate phosphate is then processed into the target product. This invention aims to produce ammonium nitrate phosphate using nitric acid, wet-process phosphoric acid, and urea, thus addressing the problems of excessively low N / P₂O₅ ratio and lack of nitrate nitrogen in ammonium phosphate fertilizers, which do not meet the requirements for crop fertilization. This reduces the workload of fertilization, increases crop yield, and improves the effectiveness of fertilizer application.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] A system for producing ammonium nitrate fertilizer includes a mixing tank and a neutralization tank. The output end of the mixing tank is connected in sequence to a mixed acid storage tank, a neutralization tank, and a buffer tank. The output ends of the buffer tank and the bottom of the evaporator are connected to the input end of a heater. The output end of the heater is connected to the evaporator. The output end of the evaporator is connected to a granulation tower through a slurry storage tank.

[0010] In the above system, the mixing tank is equipped with an input terminal for nitric acid and an input terminal for phosphoric acid.

[0011] In the above system, a mixed acid pump is installed between the mixed acid storage tank and the neutralization tank.

[0012] In the above system, agitators are installed in the mixing tank, neutralization tank, and slurry storage tank.

[0013] In the above system, a slurry pump is installed between the slurry storage tank and the granulation tower.

[0014] In the above system, a sprayer is installed at the top of the granulation tower.

[0015] In the above system: a discharge scraper is installed at the bottom of the granulation tower.

[0016] In the above system: the discharge scraper conveyor is connected to the finished product conveyor.

[0017] In some specific technical solutions, the system of the present invention is as follows:

[0018] A system for producing ammonium nitrate fertilizer includes a mixing tank, a mixed acid storage tank, a mixed acid pump, a neutralization tank, a buffer tank, a heater, an evaporator, a slurry storage tank, a slurry pump, a granulation tower, and a finished product conveyor. The raw material from the boundary area—phosphate—is connected to the top inlet A1 of the mixing tank, and the raw material from the boundary area—nitric acid—is connected to the top inlet B1 of the mixing tank. The side outlet C1 of the mixing tank is connected to the top inlet A3 of the neutralization tank via the mixed acid storage tank and the mixed acid pump. The raw material from the boundary area—gaseous ammonia—is also connected to the neutralization tank via a pipeline... The neutralization tank is connected to the top inlet B3 at the top of the tank. The neutralization tank side outlet C3 is connected to the circulation pipe inlet A5 through a buffer tank. This circulation pipe connects the bottom outlet C7 of the evaporator to the bottom inlet A6 of the heater, with inlet A5 as close as possible to inlet A6. The heater top outlet B6 is connected to the evaporator side inlet A7. The evaporator side outlet B7 is connected to the sprayer inlet A9 in the granulation tower through a slurry storage tank and a slurry pump. The granulation tower outlet B9 is connected to the inlet end of the finished product conveyor. The finished product conveyor outlet end is connected to the boundary area.

[0019] In the above system: the mixing tank is equipped with a mixing tank agitator, the neutralization tank is equipped with a neutralization tank agitator, and the slurry storage tank is equipped with a slurry storage tank agitator;

[0020] In the above system: the granulation tower is a vertical granulation tower, with a sprayer at the top and a discharge scraper at the bottom; the sprayer is a centrifugal rotary sprayer with a rotation speed of 250-300 r / min;

[0021] A method for producing ammonium nitrate phosphate fertilizer using the aforementioned system, characterized in that the method includes the following steps:

[0022] (1) Raw material feeding and mixed acid neutralization section: Wet-process phosphoric acid (containing P2O5 mass concentration ≤55%) from the boundary area enters the mixing tank through top inlet A1, and nitric acid (containing HNO3 mass concentration ≤60%) from the boundary area enters the mixing tank through top inlet B1. The mass ratio of HNO3:H3PO4 is ≥180:229. In the mixing tank, wet-process phosphoric acid and nitric acid are fully mixed to form mixed acid under the stirring of the mixing tank agitator. The mixed acid overflows from the side outlet C1 and enters the mixed acid storage tank through top inlet A2. The mixed acid in the mixed acid storage tank is pumped from the side outlet B2 into the neutralization tank through top inlet A3 by the mixed acid pump. Gaseous ammonia from the boundary area enters the neutralization tank through top inlet B3. In the neutralization tank, ammonia and mixed acid undergo a neutralization reaction to generate a neutralized slurry. The pH of the slurry solution is maintained at ≥2.5, and the slurry density is ≥1.4 g / cm³. 3 Temperature ≥ 110℃, NH3 molar ratio: (HNO3 molar ratio + H3PO4 molar ratio) = 1:1, neutralization slurry overflows from the side outlet C3 into the neutralization tank and enters the buffer tank through the top inlet A4, and the neutralization slurry in the buffer tank enters the circulation pipe through the bottom outlet B4 and the circulation pipe inlet A5.

[0023] (2) Slurry Concentration Section: The neutralized slurry from the buffer tank and the concentrated slurry from the evaporator enter the heater from the bottom inlet A6 and are heated by steam (temperature ≤197℃, pressure ≤1.5MPa). After heating, the hot slurry (temperature ≤180℃) exits the heater from the top outlet B6 and enters the evaporator through the side inlet A7. In the evaporator, the hot slurry evaporates and concentrates, the temperature decreases (temperature ≤175℃), and the water content decreases to ≤4% by mass. Part of the concentrated slurry overflows from the evaporator from the side outlet B7 as ammonium nitrate slurry and enters the slurry storage tank through the top inlet A8. The other part of the concentrated slurry exits the evaporator from the bottom outlet C7 as a circulating solution and goes to the heater.

[0024] (3) Spraying granulation and discharge section: The ammonium nitrate slurry from the side outlet B8 of the slurry storage tank is pumped from the top of the granulation tower through the inlet A9 into the sprayer. The slurry flows onto the centrifugal spraying disc, which rotates (speed ≤300r / min). The slurry droplets sprayed by the centrifugation evaporate, cool, and granulate during the falling process. The granular ammonium nitrate slurry falling to the bottom of the granulation tower has a water content reduced to ≤2% by mass. The granular ammonium nitrate slurry is scraped by the discharge scraper and exits the granulation tower from the discharge outlet B9 into the feed end of the finished product conveyor. The granular ammonium nitrate slurry is transported by the finished product conveyor as the target product - ammonium nitrate slurry fertilizer to the boundary area. The N / P2O5 mass ratio of the target product is >2:3, and the nitrate nitrogen mass percentage content is ≥8%.

[0025] A method for producing ammonium nitrate phosphate fertilizer includes mixed acid preparation and neutralization, external heating of the slurry, natural circulation, evaporation and concentration, spray granulation by a sprayer at the top of the granulation tower, and scraping and discharging by a scraper conveyor at the bottom of the granulation tower. The method is characterized by the production process comprising a raw material feeding and mixed acid neutralization section, a slurry concentration section, and a spray granulation and discharging section, with the following steps:

[0026] (1) Raw material feeding and mixed acid neutralization section: Wet-process phosphoric acid (containing 40%–55% P2O5 by mass) from the boundary area enters the mixing tank through top inlet A1, and nitric acid (containing 40%–60% HNO3 by mass) from the boundary area enters the mixing tank through top inlet B1. The mass ratio of HNO3:H3PO4 is ≥180:229. In the mixing tank, the wet-process phosphoric acid and nitric acid are fully mixed to form mixed acid under the stirring of the mixing tank agitator. The mixed acid overflows from the side outlet C1 and enters the mixed acid storage tank through top inlet A2. The mixed acid in the mixed acid storage tank is pumped from the side outlet B2 into the neutralization tank through top inlet A3 by the mixed acid pump. Gaseous ammonia from the boundary area enters the neutralization tank through top inlet B3. In the neutralization tank, ammonia and mixed acid undergo a neutralization reaction to generate a neutralized slurry. The pH of the slurry solution is maintained at 2.5–3.5, and the slurry density is 1.4–1.6 g / cm³. 3The temperature is 110-125℃, the molar ratio of NH3 is 1:1 (molar ratio of HNO3 + molar ratio of H3PO4). The neutralized slurry overflows from the side outlet C3 of the neutralization tank and enters the buffer tank through the top inlet A4. The neutralized slurry in the buffer tank enters the circulation pipe through the bottom outlet B4 and the circulation pipe inlet A5.

[0027] (2) Slurry Concentration Section: The neutralized slurry from the buffer tank and the concentrated slurry from the evaporator enter the heater through the bottom inlet A6 and are heated by steam (temperature 187℃~197℃, pressure 1.2MPa~1.5MPa). After heating, the hot slurry (temperature 170℃~180℃) exits the heater through the top outlet B6 and enters the evaporator through the side inlet A7. In the evaporator, the hot slurry evaporates and concentrates, the temperature decreases (temperature 165℃~175℃), and the water content decreases to ≤4% by mass. Part of the concentrated slurry overflows from the evaporator through the side outlet B7 as ammonium nitrate slurry and enters the slurry storage tank through the top inlet A8. The other part of the concentrated slurry exits the evaporator through the bottom outlet C7 as a circulating solution and goes to the heater.

[0028] (3) Spraying granulation and discharge section: The ammonium nitrate slurry from the side outlet B8 of the slurry storage tank is pumped from the top of the granulation tower through the inlet A9 into the sprayer. The slurry flows onto the centrifugal spraying disc, which rotates (speed is 250-300 r / min). The slurry droplets sprayed by the centrifugation evaporate, cool and granulate during the falling process. The granulated ammonium nitrate slurry falling to the bottom of the granulation tower has a water content of ≤2% by mass. The granulated ammonium nitrate slurry is scraped by the discharge scraper and exits the granulation tower from the discharge outlet B9 into the feed end of the finished product conveyor. The granulated ammonium nitrate slurry is transported by the finished product conveyor as the target product - ammonium nitrate slurry fertilizer to the boundary area. The N / P2O5 mass ratio of the target product is >2:3 and the nitrate nitrogen mass percentage content is ≥8%.

[0029] The beneficial effects of this utility model are:

[0030] The target product—ammonium nitrate phosphate—has a higher N / P2O5 ratio than ammonium phosphate phosphate, which can be adjusted according to crop requirements; ammonium nitrate phosphate contains both readily available nitrate nitrogen (NO3) and readily available nitrate nitrogen (NO2). - It contains water-soluble P2O5, as well as ammonium nitrogen (NH4) with a relatively long-lasting fertilizer effect. + Ammonium nitrate is more effective than phosphate fertilizers of the same nutrient content and is soluble in P2O5, thus increasing yield. It will not explode when impacted and / or heated. Ammonium nitrate is more suitable for dryland crops, especially crops such as tobacco and citrus that require nitrate nitrogen supply, thus improving the quality of cash crops. Ammonium nitrate has significant fertilizer effects when applied to grain crops such as wheat, corn, and rice, and cash crops such as rapeseed, tea, cotton, and soybeans, especially in medium and low fertility soils.

[0031] The slurry in the slurry thickening section uses natural circulation and does not require a slurry circulation pump;

[0032] Spray granulation uses a sprayer and a granulation tower. Ammonium nitrate does not need to be dried. The granules are round, uniform in size, and have a smooth surface. No dust is generated during production. The product does not need to be screened and there is no return material.

[0033] Nitric acid was used as the raw material throughout the entire production process, and no high-purity solid ammonium nitrate was produced, so there was no risk of fire or explosion.

[0034] This invention aims to produce ammonium phosphate using wet-process phosphoric acid, nitric acid, and ammonia, thereby addressing the problems of excessively low N / P2O5 ratio and lack of nitrate nitrogen in ammonium phosphate fertilizers, which do not meet the requirements for crop fertilization. This reduces the workload of fertilization, increases crop yield, and improves the effectiveness of fertilizer application. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the process flow in this utility model.

[0036] The components include: mixing tank 1, mixing tank agitator 2, mixed acid storage tank 3, mixed acid pump 4, neutralization tank 5, neutralization tank agitator 6, buffer tank 7, heater 8, evaporator 9, slurry storage tank 10, slurry storage tank agitator 11, slurry pump 12, granulation tower 13, sprayer 13-1, discharge scraper conveyor 13-2, and finished product conveyor 14. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without inventive effort are within the scope of protection of the present utility model. The embodiments of the present utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1As shown, a system for producing ammonium nitrate fertilizer is characterized by comprising: a mixing tank 1, a mixed acid storage tank 3, a mixed acid pump 4, a neutralization tank 5, a buffer tank 7, a heater 8, an evaporator 9, a slurry storage tank 10, a slurry pump 12, a granulation tower 13, and a finished product conveyor 14; the raw material from the boundary area—phosphate—is connected to the top inlet A1 of the mixing tank 1, the raw material from the boundary area—nitric acid—is connected to the top inlet B1 of the mixing tank 1, and the side outlet C1 of the mixing tank 1 is connected to the top inlet A3 of the neutralization tank 5 via the mixed acid storage tank 3 and the mixed acid pump 4; the raw material from the boundary area—ammonia gas—is connected to the mixing tank 1 via a pipeline. The channel is connected to the top inlet B3 of the neutralization tank 5. The side outlet C3 of the neutralization tank 5 is connected to the circulation pipe inlet A5 through the buffer tank 7. The circulation pipe connects the bottom outlet C7 of the evaporator 9 to the bottom inlet A6 of the heater 8, and the inlet A5 is as close as possible to the inlet A6. The top outlet B6 of the heater 8 is connected to the side inlet A7 of the evaporator 9. The side outlet B7 of the evaporator 9 is connected to the sprayer 13-1 inlet A9 in the granulation tower 13 through the slurry storage tank 10 and the slurry pump 12. The outlet B9 of the granulation tower 13 is connected to the inlet end of the finished product conveyor 14. The outlet end of the finished product conveyor 14 is connected to the boundary area.

[0040] The mixing tank 1 is equipped with a mixing tank agitator 2, the neutralization tank 5 is equipped with a neutralization tank agitator 6, and the slurry storage tank 10 is equipped with a slurry storage tank agitator 11.

[0041] Granulation tower 13 is a vertical granulation tower. The upper part of granulation tower 13 is equipped with a sprayer 13-1 and the lower part is equipped with a discharge scraper 13-2. The sprayer 13-1 is a centrifugal rotary sprayer with a rotation speed of 280 r / min.

[0042] The method for producing ammonium nitrate fertilizer using the above system includes the following steps:

[0043] (1) Raw material feeding and mixed acid neutralization section: Wet-process phosphoric acid (containing 54% P2O5 by mass) from the boundary area enters mixing tank 1 through top inlet A1, and nitric acid (containing 47% HNO3 by mass) from the boundary area enters mixing tank 1 through top inlet B1. The mass ratio of HNO3:H3PO4 is 457:352. In mixing tank 1, wet-process phosphoric acid and nitric acid are fully mixed to form mixed acid under the stirring of mixing tank agitator 2. The mixed acid overflows from mixing tank 1 through side outlet C1 and enters mixed acid storage tank 3 through top inlet A2. The mixed acid in mixed acid storage tank 3 is pumped from side outlet B2 to neutralization tank 5 through top inlet A3 by mixed acid pump 4. Gaseous ammonia from the boundary area enters neutralization tank 5 through top inlet B3. In neutralization tank 5, ammonia and mixed acid undergo a neutralization reaction to generate neutralized slurry. The pH of the slurry solution is maintained at 3.0, and the slurry density is 1.55 g / cm³. 3The temperature is 118℃, the molar ratio of NH3 to (molar ratio of HNO3 + molar ratio of H3PO4) is 1:1, the slurry contains approximately 31% ammonium phosphate and approximately 44% ammonium nitrate, and has a water content of 25%. The neutralized slurry overflows from the side outlet C3 into the neutralization tank 5 and enters the buffer tank 7 through the top inlet A4. The neutralized slurry in the buffer tank 7 enters the circulation pipe through the bottom outlet B4 and the circulation pipe inlet A5.

[0044] (2) Slurry Concentration Section: The neutralized slurry from the buffer tank 7 and the concentrated slurry from the evaporator 9 enter the heater 8 from the bottom inlet A6 and are heated by steam (temperature 190℃, pressure 1.3MPa). After heating, the hot slurry (temperature 175℃) exits the heater 8 from the top outlet B6 and enters the evaporator 9 through the side inlet A7. In the evaporator 9, the hot slurry evaporates and concentrates, and the temperature decreases (temperature 170℃). The mass concentration of ammonium phosphate is 40.6%, the mass concentration of ammonium nitrate is 57.6%, and the mass concentration of water is reduced to 1.8%. Part of the concentrated slurry overflows from the evaporator 9 as ammonium phosphate slurry from the side outlet B7 and enters the slurry storage tank 10 through the top inlet A8. The other part of the concentrated slurry exits the evaporator 9 as a circulating solution from the bottom outlet C7 and goes to the heater 8.

[0045] (3) Spraying granulation and discharge section: Ammonium nitrate slurry from the side outlet B8 of the slurry storage tank 10 is pumped by slurry pump 12 from the top of the granulation tower 13 through the feed inlet A9 into the sprayer 13-1. The slurry flows onto the centrifugal spraying disc, which rotates (at a speed of 280 r / min). The slurry droplets sprayed by the centrifugation evaporate, cool, and granulate during their fall. The granulated ammonium nitrate slurry falling to the bottom of the granulation tower 13 has a water content reduced to 1% by mass and is then discharged. The scraper conveyor 13-2 scrapes granulated ammonium nitrate from the discharge port B9 of the granulation tower 13 and into the feed end of the finished product conveyor 14. The finished product conveyor 14 transports the granulated ammonium nitrate as the target product—ammonium nitrate fertilizer—to the boundary area. The target product has an N / P2O5 mass ratio of 1:1, contains 25.36% of total N by mass, of which 10.16% is nitrate nitrogen, accounting for 40% of the total nitrogen, and contains 25.49% of P2O5 by mass.

[0046] Examples of the implementation results of this utility model are shown in Table 1.

[0047] Table 1 Performance evaluation results of the 8-ton / hour ammonium nitrate fertilizer plant.

[0048]

Claims

1. A system for producing ammonium nitrate fertilizer, characterized in that: The system includes a mixing tank (1) and a neutralization tank (5). The output end of the mixing tank (1) is connected in sequence through a mixed acid storage tank (3), a neutralization tank (5), and a buffer tank (7). The output ends of the buffer tank (7) and the bottom of the evaporator (9) are connected to the input end of the heater (8). The output end of the heater (8) is connected to the evaporator (9). The output end of the evaporator (9) is connected to the granulation tower (13) through a slurry storage tank (10).

2. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: The mixing tank (1) is equipped with an input terminal for nitric acid and an input terminal for phosphoric acid.

3. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: A mixed acid pump (4) is provided between the mixed acid storage tank (3) and the neutralization tank (5).

4. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: Agitators are provided in the mixing tank (1), neutralization tank (5) and slurry storage tank (10).

5. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: A slurry pump (12) is provided between the slurry storage tank (10) and the granulation tower (13).

6. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: A sprayer (13-1) is provided at the top of the granulation tower (13).

7. The system for producing ammonium nitrate fertilizer according to claim 1, characterized in that: The lower part of the granulation tower (13) is equipped with a discharge scraper (13-2).

8. The system for producing ammonium nitrate fertilizer according to claim 7, characterized in that: The discharge scraper conveyor (13-2) is connected to the finished product conveyor (14).

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