High-magnesium medium-trace particle water-soluble fertilizer production system

Abstract

The utility model relates to the technical field of granular water-soluble fertilizers, in particular to a high-magnesium medium-trace granular water-soluble fertilizer production system. The utility model discloses a high-magnesium medium-trace particle water-soluble fertilizer production system which comprises a proportioning tank used for receiving calcium-magnesium liquid and adjusting the calcium-magnesium liquid into proportioning liquid; the concentrator is connected to the proportioning tank; the concentrator is connected to the granulation equipment; the screening device is connected to the granulation equipment; the granulation equipment comprises a granulator, a fluidized bed arranged in the granulator and a nozzle arranged above the fluidized bed. According to the method, by-product calcium and magnesium liquid generated in the chemical mineral separation process is used as a raw material, granulation is conducted through the fluidized bed technology, concentrated and cooled slurry is sprayed to the returned material through the nozzle, the slurry is rapidly solidified and forms particles, and the problem of high-value utilization of the chemical mineral separation by-product calcium and magnesium liquid is solved.

Description

Technical Field

[0001] This application relates to the technical field of granular water-soluble fertilizers, and in particular to a production system for high-magnesium micro-granular water-soluble fertilizers. Background Technology

[0002] With the advancement of agricultural modernization and increased awareness of environmental protection, the fertilizer industry is undergoing profound changes. In traditional phosphate rock beneficiation, sulfuric acid is typically used as a leaching agent to extract phosphorus from the phosphate rock. However, this method is not only inefficient and costly, but also generates large amounts of phosphogypsum solid waste, causing environmental pollution. In recent years, chemical beneficiation processes have gradually emerged, particularly the method of leaching phosphate rock with dilute nitric acid. Because it can simultaneously separate important elements such as calcium and magnesium and avoid the generation of phosphogypsum, it is widely considered a more environmentally friendly and cost-effective option. However, this generates large amounts of calcium-magnesium liquor, which, if directly discharged, poses a risk of environmental pollution and wastes resources.

[0003] High-magnesium micronutrient granular water-soluble fertilizer, as a novel type of fertilizer, has attracted increasing attention in the market due to its ability to significantly improve crop calcium absorption efficiency, improve soil structure, and promote healthy plant growth. This type of fertilizer, by optimizing the ratio of nitrogen, calcium, and magnesium and adding essential micronutrients, can better meet the needs of different crops and improve agricultural production efficiency.

[0004] Most granular calcium-magnesium fertilizers currently on the market are made by simple physical mixing, resulting in unstable composition and clumping, especially during transportation and storage, which affects fertilization effect. In addition, the existing granular calcium-magnesium fertilizer production process is complex and requires multiple steps to obtain a product that meets the requirements, which increases manufacturing costs and limits the possibility of large-scale commercial promotion.

[0005] Therefore, this application provides a production system for preparing high-magnesium micro-granular water-soluble fertilizer by utilizing calcium-magnesium solution. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, this application provides a high-magnesium micro-granular water-soluble fertilizer production system. It uses calcium-magnesium liquor, a byproduct of chemical mineral processing, as raw material and employs fluidized bed technology for granulation. The concentrated and cooled slurry is sprayed onto the recycled material through nozzles, causing it to solidify rapidly and form granules. This solves the problem of high-value utilization of calcium-magnesium liquor, a byproduct of chemical mineral processing.

[0007] The technical solution adopted by this application to solve its technical problem is:

[0008] A high-magnesium micro-granular water-soluble fertilizer production system includes a mixing tank, which is used to receive calcium-magnesium solution and adjust it into a mixed solution.

[0009] A concentrator connected to a mixing tank;

[0010] Granulation equipment, wherein the concentrator is connected to the granulation equipment;

[0011] A sieve, which is connected to the granulation equipment;

[0012] The granulation equipment includes a granulator, a fluidized bed disposed within the granulator, and nozzles disposed above the fluidized bed.

[0013] In several specific embodiments, the nozzle is a dual-fluid nozzle, which is connected to a feed pump and receives the concentrated and cooled slurry from the concentrator through a pipeline.

[0014] In several specific embodiments, the granulator is equipped with a folded lifting plate inside the drum, which folds the backflow into the fluidized bed.

[0015] In several specific embodiments, the fluidized bed is connected to the outer shell of the granulator, and granulation air is blown out from the honeycomb plate of the fluidized bed.

[0016] In several specific embodiments, a trace element cell is also included, which is connected to a concentrator.

[0017] In several embodiments, a pulverizer is also included, the feed inlet of which is connected to a screen, and the discharge outlet of which is connected to a granulator.

[0018] In several specific embodiments, the feed inlet of the mixing tank is connected to the calcium-magnesium solution clearing tank and the crude nitrate-calcium solution clearing tank, respectively.

[0019] In several specific embodiments, the calcium-magnesium liquid clearing tank is connected to a filter press, and the filter press is connected to a calcium-magnesium liquid neutralization tank.

[0020] In several specific embodiments, the crude calcium nitrate solution clearing tank is connected to a filter press, and the filter press is connected to the crude calcium nitrate solution neutralization tank.

[0021] In several specific embodiments, the concentrator is connected to a cooling tank, the cooling tank is connected to a feed pump, and the feed pump is connected to a nozzle.

[0022] The beneficial effects of this application are as follows:

[0023] The production system described in this application performs precise proportioning in a mixing tank and granulation in a granulation device to produce high-quality high-magnesium micronutrient granular water-soluble fertilizer. This granular water-soluble fertilizer improves the crop's absorption rate of fertilizer, thereby improving the fertilizer's effectiveness.

[0024] The production system described in this application utilizes calcium-magnesium liquid, a byproduct, as a raw material, thereby reducing waste emissions and providing environmental benefits. Attached Figure Description

[0025] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of a high-magnesium micro-granular water-soluble fertilizer production system described in this application;

[0027] Figure 2 This is a schematic diagram of the structure of the proportioning tank described in this application connected to the calcium-magnesium solution neutralization tank and the crude nitrate-calcium solution neutralization tank;

[0028] Figure 3 This is a schematic diagram of the granulation equipment described in this application;

[0029] Figure 4 This is a schematic diagram of the material flow in the high magnesium micro-granular water-soluble fertilizer production system described in this application.

[0030] The components include: 1. Proportioning tank; 2. Concentrator; 3. Granulation equipment; 4. Screener; 5. Feed pump; 6. Trace element tank; 7. Crusher; 8. Calcium-magnesium solution clearing tank; 9. Crude nitrate-calcium solution clearing tank; 10. Filter press; 11. Calcium-magnesium solution neutralization tank; 12. Crude nitrate-calcium solution neutralization tank; 13. Cooling tank; 301. Granulator; 302. Fluidized bed; 303. Nozzle; 304. Honeycomb plate. Detailed Implementation

[0031] The following will clearly and completely describe the concept, specific structure, and resulting technical effects of this application in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this application can be combined interactively without contradicting each other.

[0032] Terminology Explanation:

[0033] Fluidized bed: A reactor or processing device in which solid particles are suspended in a gaseous or liquid fluid. In this state, the solid particles exhibit fluid-like behavior and can be used for various processes such as heating, cooling, drying, or chemical reactions.

[0034] Dual-fluid nozzle: A spraying device capable of simultaneously spraying two different media (typically liquid and gas). In this application, a dual-fluid nozzle is used to mix concentrated and cooled slurry with compressed air and then spray it out to form fine and uniform droplets.

[0035] Folded lifting plate: A type of plate installed inside a rotating drum. Its function is to continuously lift and throw materials during material flow to promote the fusion of new and old particles and ensure that the material is evenly distributed on the fluidized bed.

[0036] Honeycomb plate: Generally refers to a plate-like structure with many small holes, used to disperse airflow, so that gas can be blown into the fluidized bed evenly and maintain the material in a good suspended state.

[0037] like Figure 1 As shown, a high-magnesium micro-granular water-soluble fertilizer production system includes a mixing tank 1, which is used to receive calcium-magnesium solution and adjust it into a mixing solution.

[0038] Concentrator 2, which is connected to mixing tank 1;

[0039] Granulation equipment 3, the concentrator 2 is connected to granulation equipment 3;

[0040] Screening device 4, which is connected to granulation equipment 3;

[0041] The granulation equipment 3 includes a granulator 301, a fluidized bed 302 disposed within the granulator 301, and a nozzle 303 disposed above the fluidized bed 302.

[0042] Specifically, it is used to receive calcium and magnesium solution and adjust it into a specific ratio to ensure that each component is mixed as required;

[0043] The concentrator, connected to the mixing tank, removes excess water through evaporation and other methods, increases the slurry concentration, and controls its specific gravity (density) within an appropriate range.

[0044] The granulation equipment consists of a granulator, a built-in fluidized bed, and a dual-fluid nozzle. It uses compressed air to atomize the slurry and spray it onto the return material to form granules. At the same time, the fluidized bed provides a good material dispersion environment to ensure uniform particle growth.

[0045] The sieve separates the granulated finished product from qualified large particles, small particles and dust, while unqualified materials are returned to the system for reprocessing.

[0046] Therefore, the above-mentioned technical solution, which uses dilute nitric acid to leach phosphate rock, transforms the byproducts into high-value fertilizer products, thus avoiding the environmental pollution problems caused by the traditional sulfuric acid process.

[0047] In one or more embodiments, such as Figure 3As shown, the nozzle 303 is a dual-fluid nozzle 303, which is connected to the feed pump 5 and receives the concentrated and cooled slurry from the concentrator 2 through a pipeline.

[0048] More specifically, the nozzle is located inside the granulator and connected to the feed pump. It receives the concentrated and cooled slurry through a pipeline and introduces compressed air to spray the concentrated and cooled slurry into a mist, which is then evenly sprayed onto the return material.

[0049] In one or more embodiments, the granulator 301 is provided with a folded lifting plate inside the drum, which folds the plate backflow into the fluidized bed 302.

[0050] Specifically, by installing folded lifting plates inside the granulator drum, the returned material can be continuously lifted and thrown onto the fluidized bed, ensuring that the material is evenly distributed in the fluidized bed, thereby improving granulation efficiency and quality. Furthermore, the folded lifting plate design helps maintain good material flowability and dispersibility, allowing the sprayed slurry to quickly contact the returned material and solidify into regularly shaped particles. As the drum rotates, the folded lifting plates continuously lift and throw the material from the bottom outwards. This process not only increases the collision opportunities between materials but also promotes the fusion of new and old particles, accelerating particle growth.

[0051] In one or more embodiments, the fluidized bed 302 is connected to the outer shell of the granulator 301, and granulation air is blown out from the honeycomb plate 304 of the fluidized bed 302.

[0052] Specifically, blowing granulation air through the honeycomb plate creates a stable airflow layer in the fluidized bed, suspending the material and further enhancing the fluidization effect, which is beneficial for particle growth. Using compressed air blown into the fluidized bed through the honeycomb plate puts the material in a boiling state, achieving good dispersion and mixing. In this state, the friction between materials decreases, fluidity increases, and an ideal adhesion environment is provided for the sprayed slurry. Because the material in the fluidized bed remains well dispersed, the risk of localized overheating is reduced, while also facilitating uniform heat transfer, improving cooling efficiency, and ensuring stable particle formation.

[0053] In one or more embodiments, a trace element tank 6 is also included, which is connected to the concentrator 2.

[0054] Specifically, essential trace elements such as boron and zinc can be added to the concentrator through a trace element tank to enhance the fertilizer's effectiveness.

[0055] In one or more embodiments, a crusher 7 is further included, the inlet of which is connected to a screen 4, and the outlet of which is connected to a granulator 301.

[0056] Specifically, the crusher is located below the screener and processes the unqualified large particles that are screened out; the feed inlet of the crusher is connected to the screener, and the discharge outlet of the crusher returns the unqualified large particles to the granulator after crushing, ensuring that the material participates in the granulation process again.

[0057] In one or more embodiments, such as Figure 2 As shown, the feed inlet of the mixing tank 1 is connected to the calcium magnesium solution clearing tank 8 and the crude nitrate calcium solution clearing tank 9, respectively.

[0058] Specifically, the calcium-magnesium liquid clearing tank 8 is connected to the filter press 10, and the filter press 10 is connected to the calcium-magnesium liquid neutralization tank 11.

[0059] Specifically, the crude calcium nitrate solution clearing tank 9 is connected to the filter press 10, and the filter press 10 is connected to the crude calcium nitrate solution neutralization tank 12.

[0060] In the above technical solution, a filter press is used to separate the solid and liquid components of the original leachate, so that solid impurities are trapped on the filter cloth, while the clarified liquid flows into the corresponding clear liquid tank. By removing impurities from the calcium magnesium solution and crude calcium nitrate solution through the filter press, it is ensured that the liquid entering the mixing tank is a clear liquid, thereby improving the purity of the final product.

[0061] In the above technical solution, an appropriate amount of calcium hydroxide powder or gaseous ammonia is added to the neutralization tank to adjust the pH value of the solution to a suitable range (e.g., 6-8), so that the free acid in the solution is neutralized and a relatively stable calcium magnesium nitrate mixture is formed. The neutralized calcium magnesium solution and crude calcium nitrate solution are sent to the proportioning tank respectively. The ratio of the two liquids can be flexibly adjusted according to specific needs to achieve the best chemical composition and performance.

[0062] In one or more embodiments, the concentrator 2 is connected to the cooling tank 13, the cooling tank 13 is connected to the feed pump 5, and the feed pump 5 is connected to the nozzle 303.

[0063] Specifically, the output of the concentrator is directly connected to the input of the cooling tank via a pipe to transfer the high-temperature slurry after concentration; the output of the cooling tank is connected to the input of the feed pump via a pipe to send the cooled slurry into the feed pump for pressurized delivery; the output of the feed pump is connected to the input of the nozzle via a pipe to ensure that the cooled slurry can be sprayed out under appropriate pressure to form a uniform mist.

[0064] By connecting the concentrator to the cooling tank, the temperature of the concentrated slurry can be effectively reduced to the optimal temperature range for granulation (70℃-125℃), thus avoiding granulation failure or low efficiency due to excessive temperature. The cooled slurry is then pumped to the nozzle by a feed pump to ensure that the material is sprayed out evenly and stably during the spraying process, forming an ideal particle shape.

[0065] Specifically, in this application, the screener is a vibrating screener, which screens the material overflowing from the granulator and separates qualified particles from large particles (which need to be crushed and returned to the granulator).

[0066] like Figure 4 As shown, the operation process of a high-magnesium micro-granular water-soluble fertilizer production system is as follows:

[0067] 1. Raw material preparation

[0068] The calcium-magnesium solution and the crude calcium nitrate solution are respectively fed into the calcium-magnesium solution neutralization tank and the crude calcium nitrate solution neutralization tank for neutralization reaction; after the reaction is completed, they are filtered and introduced into the calcium-magnesium solution clear tank and the crude calcium nitrate solution clear tank respectively.

[0069] 2. Proportioning

[0070] Adjust the ratio of calcium magnesium solution and crude calcium nitrate solution in the mixing tank to form a mixed solution.

[0071] 3. Concentrated

[0072] The prepared solution is fed into a concentrator for concentration to increase the slurry concentration.

[0073] 4. Micronutrient supplementation

[0074] During the concentration process, trace elements are added to the slurry through a trace element tank.

[0075] 5. Granulation

[0076] After the concentrated slurry is cooled, it is fed to the nozzle of the granulation equipment by a feed pump to form granules on a fluidized bed.

[0077] 6. Screening

[0078] The granulated particles are fed into a sieve to separate qualified and unqualified particles.

[0079] 7. Crushing and recycling:

[0080] Unqualified large particles are crushed by a pulverizer and then sent back to the granulation equipment for regranulation.

[0081] The above is a detailed description of the preferred embodiments of this application. However, the invention of this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A high-magnesium trace particle water-soluble fertilizer production system, characterized in that, It comprises a proportioning tank (1) for receiving calcium magnesium liquid and adjusting into proportioning liquid, a concentrator (2) connected to the proportioning tank (1), a granulating device (3) connected to the concentrator (2), a sifter (4) connected to the granulating device (3). The granulating device (3) comprises a granulator (301), a fluidized bed (302) arranged in the granulator (301), and a nozzle (303) arranged above the fluidized bed (302). The nozzle (303) is a double-fluid nozzle (303) connected to a feeding pump (5) and receiving the concentrated and cooled slurry from the concentrator (2) through a pipeline. The granulator (301) is provided with a folded scraper inside the drum, which reversely flows into the fluidized bed (302). The fluidized bed (302) is connected to the shell of the granulator (301), and the granulating air is blown out from the cloth baffle (304) of the fluidized bed (302).

2. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, It also comprises a trace element tank (6) connected to the concentrator (2).

3. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, It also comprises a pulverizer (7) with an inlet connected to the sifter (4) and an outlet connected to the granulator (301).

4. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, The inlet of the proportioning tank (1) is connected to a calcium magnesium liquid clear liquid tank (8) and a coarse nitro calcium liquid clear liquid tank (9).

5. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized in that, The calcium magnesium liquid clear liquid tank (8) is connected to a filter press (10), and the filter press (10) is connected to a calcium magnesium liquid neutralization tank (11).

6. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, The coarse nitro calcium liquid clear liquid tank (9) is connected to a filter press (10), and the filter press (10) is connected to a coarse nitro calcium liquid neutralization tank (12).

7. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, The concentrator (2) is connected to a cooling tank (13), the cooling tank (13) is connected to a feeding pump (5), and the feeding pump (5) is connected to a nozzle (303).

8. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 7, characterized by, ​ 9. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 7, characterized by, ​ 10. The high-magnesium micronutrient water-soluble fertilizer production system according to claim 1, characterized by, ​

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