A three-stage aeration system for reaction materials

Abstract

This utility model discloses a three-stage aeration system for reactants, relating to the technical field of wet-process phosphoric acid equipment. The three-stage aeration system includes a primary aeration device with its inlet connected to the feed feed; a secondary reaction pipe with its inlet connected to the outlet of the primary aeration device via a transition pipe; a secondary aeration mechanism located at the beginning of the secondary reaction pipe; a tertiary reaction pipe with its inlet connected to the outlet of the secondary reaction pipe via a transition pipe; a tertiary aeration mechanism located at the beginning of the tertiary reaction pipe; a compression pipe located at the end of the tertiary reaction pipe; and a discharge pipe connected to the compression pipe. This utility model, through its unique three-stage aeration design, can increase the aeration rate by 8-30%, resulting in better suspension of solid particles, preventing sedimentation and accumulation, improving the reaction efficiency and uniformity of the reaction system in phosphogypsum production, and ultimately enhancing product quality.

Description

Technical Field

[0001] This utility model relates to wet-process phosphoric acid equipment, specifically, to a three-stage aeration system for reactants. Background Technology

[0002] The wet-process phosphoric acid production method primarily uses sulfuric acid to decompose phosphate rock, causing a reaction that produces phosphoric acid and calcium sulfate. Through acid hydrolysis, filtration, and purification processes, phosphoric acid is separated from impurities. This process is mature and can be scaled up for large-scale production, but it faces challenges such as the treatment of phosphogypsum waste and improving product purity. The treatment of phosphogypsum solid waste has long been a difficult problem in this field. Currently, researchers have improved the process so that the wet-process phosphoric acid production method can produce qualified phosphoric acid, as well as industrially compliant phosphogypsum byproducts and reusable auxiliary materials, fundamentally solving the problem of difficult traditional phosphogypsum solid waste treatment.

[0003] In the wet-process phosphoric acid production process, the reaction tank, as the core equipment, plays a decisive role in realizing the crucial step of the chemical reaction between phosphate rock and sulfuric acid to produce phosphoric acid and phosphogypsum. During the reaction, the good suspension state of solid particles in the reaction solution has a decisive impact on improving reaction efficiency and product quality.

[0004] Traditional wet-process phosphoric acid production reactors have relatively simple aeration designs, generally employing direct aeration within the reactor. However, this conventional aeration method has revealed a series of problems and shortcomings in practical applications.

[0005] First, traditional aeration systems are overly simplified in design, making it difficult to ensure uniform suspension of solid particles in the reaction solution. Phosphate rock particles tend to settle easily in the reaction solution, resulting in excessively high particle concentration at the bottom, while the upper reaction solution is thin due to a lack of particles. This not only hinders the uniformity of the reaction throughout the tank but may also lead to localized over- or under-reaction. For example, in large reaction tanks, the phosphate rock particles settling at the bottom react too rapidly due to excessive contact with sulfuric acid, while the upper reaction solution, lacking particles, reacts slowly, severely impacting the overall reaction efficiency.

[0006] Secondly, the settling of solid particles leads to the problem of accumulation and trapping. After accumulation and trapping, the effective contact area between the particles and sulfuric acid is significantly reduced. Furthermore, the accumulated solids may trap and trap incompletely reacted reactants and products, further slowing down the reaction process. Moreover, the accumulated particles may clog the discharge port or pipes of the reaction vessel, affecting the continuity of production and increasing equipment maintenance costs.

[0007] Furthermore, the uneven suspension of solid particles in the reaction solution severely affects the homogeneity of the reaction. This inhomogeneity leads to significant differences in the quality of the resulting phosphoric acid and phosphogypsum, as well as uneven distribution of impurities. Utility Model Content

[0008] To address the problems of the prior art, this utility model provides a three-stage aeration system for reactants. By integrating the feeding pipe and the aeration pipe and adding a multi-stage aeration structure, the material undergoes pre-excitation treatment during the process of being transported to the reaction tank, thereby improving the uniform mixing effect of the material in the reaction tank.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A three-stage aeration system for reactants includes a primary aeration device with its inlet connected to the feed, a secondary reaction pipe with its inlet connected to the outlet of the primary aeration device via a transition pipe, a secondary aeration mechanism located at the beginning of the secondary reaction pipe, a tertiary reaction pipe with its inlet connected to the outlet of the secondary reaction pipe via a transition pipe, a tertiary aeration mechanism located at the beginning of the tertiary reaction pipe, a compression pipe located at the end of the tertiary reaction pipe, and a discharge pipe connected to the compression pipe.

[0011] Specifically, the primary aeration device uses a Venturi aerator.

[0012] Specifically, the length of the tertiary reaction tube is 1.6 to 1.8 times the length of the secondary reaction tube.

[0013] Specifically, the inner diameter of the tertiary reaction tube is not less than the inner diameter of the secondary reaction tube.

[0014] Specifically, the compression tube is cone-shaped with a large inlet and a small outlet, and the inlet of the compression tube is directly connected to the outlet at the tail end of the tertiary reaction tube.

[0015] Specifically, the secondary aeration mechanism includes an aeration distribution ring fitted onto a transition pipe at the beginning of the secondary reaction pipe, an air supply port on the outer wall of the aeration distribution ring, multiple aeration outlet pipes connected between the aeration distribution ring and the beginning of the secondary reaction pipe and evenly distributed in a circle, and an aeration head installed at the end of the aeration outlet pipe and performing aeration in the secondary reaction pipe.

[0016] Specifically, the secondary aeration mechanism is configured with 2-4 aeration outlet pipes.

[0017] Specifically, the three-stage aeration mechanism has the same structure as the two-stage aeration mechanism, wherein the aeration distribution ring is placed on the transition pipe at the beginning of the three-stage reaction tube, and the number of aeration heads in the three-stage aeration mechanism is greater than that in the two-stage aeration mechanism.

[0018] Specifically, the three-stage aeration mechanism is configured with 4-6 aeration heads.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This utility model integrates the feeding pipeline and the aeration pipeline, and uses multi-stage super-aeration treatment. The material undergoes thorough gas-liquid mixing before entering the reaction tank, achieving better suspension of solid particles in the reaction liquid. This effectively avoids sedimentation and accumulation of solid particles, thus greatly improving the uniform mixing effect of the material in the subsequent reaction tank. This not only improves the quality of phosphoric acid and phosphogypsum but also increases their yield, thereby achieving higher economic benefits in industrial production.

[0021] (2) The multi-stage aeration structure designed in this invention achieves gradual aeration of materials, from primary aeration to enhanced aeration in secondary and tertiary stages. Overall, it can increase the aeration rate by 8-30%. This design achieves the expected effect of the super-aeration process, providing more sufficient super-aeration conditions for the wet-process phosphoric acid reaction, thereby promoting the smooth progress of the wet-process phosphoric acid reaction. This not only accelerates the reaction rate but also makes the reaction more thorough, improving the purity and quality of the product.

[0022] (3) This utility model ensures the stability and efficiency of materials during transportation and processing through the design of the reaction tube length and inner diameter, as well as the setting of the compression tube. The setting of the compression tube further enhances the efficiency of gas-liquid mixing, ensures that the reaction can operate in the optimal state, and plays a positive role in improving the production capacity of the entire system.

[0023] (4) The different configurations of the number of aeration heads in the secondary and tertiary aeration mechanisms of this utility model flexibly adjust the requirements of the wet phosphoric acid process in the super-aeration stage, so that the process parameters such as aeration in this stage are kept within the optimal range, thereby improving production efficiency and resource utilization. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0025] Figure 2 This is a partial structural diagram of the secondary aeration mechanism in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the aeration head configured in the secondary reaction tube in an embodiment of this utility model.

[0027] Figure 4 This is a partial structural diagram of the three-stage aeration mechanism in an embodiment of this utility model.

[0028] Figure 5This is a schematic diagram of the structure of the aeration head configured in the three-stage reaction tube in an embodiment of this utility model.

[0029] Figure 6 This is a partial structural diagram of the compression tube portion in an embodiment of the present invention.

[0030] The components corresponding to the reference numerals in the attached drawings are:

[0031] 1- Primary aeration device, 2- Secondary reaction tube, 3- Transition tube, 4- Tertiary reaction tube, 5- Compression tube, 6- Discharge tube, 10- Secondary aeration mechanism, 11- Aeration distribution ring, 12- Air supply port, 13- Aeration outlet pipe, 14- Aeration head, 20- Tertiary aeration mechanism. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0033] Example

[0034] like Figures 1 to 6 As shown, this three-stage aeration system for reactants includes a primary aeration device 1 with its inlet connected to the feed feed; a secondary reaction pipe 2 with its inlet connected to the outlet of the primary aeration device 1 via a transition pipe 3; a secondary aeration mechanism 10 located at the beginning of the secondary reaction pipe; a tertiary reaction pipe 4 with its inlet connected to the outlet of the secondary reaction pipe via the transition pipe 3; a tertiary aeration mechanism 20 located at the beginning of the tertiary reaction pipe; a compression pipe 5 located at the end of the tertiary reaction pipe; and a discharge pipe 6 connected to the compression pipe. Through the coordinated operation of the three-stage aeration mechanisms, this system ensures uniform suspension of solid particles during the reaction process. Furthermore, the design of the compression pipe further improves reaction efficiency and the uniformity of the mixture.

[0035] Specifically, the primary aeration device employs a Venturi aerator. Based on the location and direction of the feed pipe, the inlet of the Venturi aerator is tightly connected to the feed pipe to ensure a good seal. The contraction section of the Venturi aerator causes a sudden increase in material flow velocity, creating a negative pressure effect at the throat. Subsequently, the air inlet on the side cleverly draws in air, achieving thorough mixing with the material. By adjusting the feed pressure, the valves on the air inlet pipe, and the parameters of the air source equipment, the gas-liquid mixing ratio can be precisely controlled to achieve the best initial aeration effect.

[0036] The secondary reaction pipe is typically made of corrosion-resistant materials, such as rubber-lined carbon steel or fiberglass, to withstand the corrosiveness of the reaction solution in the wet-process phosphoric acid production. Its length and inner diameter are determined based on the actual production scale; for example, in medium-scale production, the length can be set to 2-3 meters and the inner diameter to 0.5-1 meter. A transition pipe is inserted from the center of the first end of the secondary reaction pipe to transport the mixture of phosphate rock particles and the reaction solution. This design ensures that the reactants can enter the reaction system rapidly and uniformly, laying a good foundation for subsequent aeration and reaction processes.

[0037] The secondary aeration mechanism 10 includes an aeration distribution ring 11 fitted onto a transition pipe at the beginning of the secondary reaction pipe, an air supply port 12 located on the outer wall of the aeration distribution ring, multiple aeration outlet pipes 13 evenly distributed circumferentially between the aeration distribution ring and the beginning of the secondary reaction pipe, and an aeration head 14 installed at the end of the aeration outlet pipe and performing aeration within the secondary reaction pipe. The aeration distribution ring can be made of 316L stainless steel and is securely fitted onto the transition pipe to ensure stability and prevent displacement throughout the reaction process. The air supply port is fixed to the outer wall of the aeration distribution ring via openings and welding, connecting to an external air supply pipe, and using flange or threaded connections to ensure airtightness. The aeration outlet pipes can also be made of 316L stainless steel, evenly distributed according to the design quantity (2-4), with consistent circumferential angle intervals, connecting the aeration distribution ring and the beginning of the secondary reaction pipe and fixed by welding. The aeration heads are made of corrosion-resistant ceramic or high-strength engineering plastic and are installed at the end of the aeration outlet pipe via threads or clamps to ensure uniform bubble distribution and promote solid particle suspension. This not only ensures uniform aeration, but also extends the service life of the equipment and reduces maintenance costs by using corrosion-resistant materials.

[0038] The tertiary reaction tube is made of the same material as the secondary reaction tube, and its length is designed to be 1.6-1.8 times that of the secondary reaction tube. For example, if the secondary reaction tube is 2.5 meters long, the tertiary reaction tube should be 4-4.5 meters long. The inner diameter needs to be adjusted flexibly according to the actual situation, but it should be ensured to be no less than the inner diameter of the secondary reaction tube, and preferably 1.2 times the inner diameter of the secondary reaction tube. This ensures smooth flow of the reaction liquid and better accommodates the gas-liquid-solid mixture after aeration.

[0039] The transition pipe can be made of the same material as the reaction pipe, and is tightly connected by welding or flanges between the outlet of the primary aeration device and the inlet of the secondary reaction pipe, and between the outlet of the secondary reaction pipe and the inlet of the tertiary reaction pipe, ensuring good sealing at the connection points and preventing leakage. This design ensures the flowability of the reaction liquid in the tertiary reaction pipe and the continuity of the reaction, providing sufficient time and space for the reaction.

[0040] The structure of the tertiary aeration mechanism is the same as that of the tertiary aeration mechanism. The aeration distribution ring is fitted onto the transition pipe at the beginning of the tertiary reaction tube. The tertiary aeration mechanism has more aeration heads than the tertiary aeration mechanism, preferably 4-6, arranged in a circumferentially even distribution to ensure uniform aeration. The aeration heads are installed in the same way as the tertiary aeration mechanism, and are made of ceramic or high-strength engineering plastics to ensure aeration effect and corrosion resistance. This design ensures that solid particles are further evenly dispersed and suspended in the tertiary aeration stage, guaranteeing the final reaction effect.

[0041] The compression tube can be made of the same corrosion-resistant material as the reaction tube and treated with anti-corrosion measures, such as lining with rubber or coating with an anti-corrosion coating. It is manufactured in a conical shape with a large inlet and a small outlet. The inlet directly connects to the outlet of the tertiary reaction tube, and can be fixed by welding or flange connection. The specific taper configuration is determined to meet actual production needs, ensuring the compression ratio is maintained within a suitable range to efficiently compress the reaction mixture, thereby significantly improving reaction efficiency. This design not only improves the fluidity of the reaction mixture but also enhances the contact between solid particles and the reaction liquid through compression, increasing the reaction rate.

[0042] The discharge pipe can be made of the same corrosion-resistant, high-performance material as the reaction pipe, with one end tightly connected to the compression pipe outlet and the other end seamlessly connected to subsequent processing equipment. Connections are made by welding or flanges to ensure a leak-proof seal. Valves can be installed on the discharge pipe as needed to control the discharge speed and flow rate. This design ensures that reaction products can be smoothly and unimpededly discharged from the system, achieving control over the discharge speed and flexibly responding to various feeding requirements.

[0043] Through the above structural design, this utility model exhibits many significant beneficial effects in the wet-process phosphoric acid production process.

[0044] 1. Improved Solid Particle Suspension: The primary aeration device initially aerates the incoming solid particles and reaction liquid during the feeding stage, causing the particles to begin to disperse and suspend evenly. The secondary and tertiary aeration mechanisms, located in their respective reaction tubes, further enhance aeration, continuously promoting solid particle suspension. The compression tube, by compressing the mixture, further increases the contact between particles and liquid, ensuring that the solid particles maintain a good suspension state throughout the entire reaction process. Actual testing shows that compared to traditional aeration systems, this invention successfully improves the uniformity of solid particle suspension by 30% to 40%, effectively preventing particle settling.

[0045] 2. Prevention of Settlement and Accumulation: The excellent suspension effect fundamentally reduces the possibility of solid particle settling, thereby preventing accumulation problems caused by settling. Common problems in traditional systems, such as pipe blockage and uneven reaction caused by particle settling and accumulation, are effectively solved.

[0046] 3. Improved Reaction Efficiency and Uniformity: The thorough suspension of solid particles allows for more uniform contact of reactants in the reaction solution, significantly increasing the reaction rate. The three-stage aeration treatment at different stages promotes the reaction, and the compression pipe enhances the reaction, making the entire reaction process more efficient. Simultaneously, uniform suspension ensures the reaction proceeds evenly throughout the entire reaction tank. Comparative tests show that using this system reduces reaction time by an average of 10% to 30%, and improves the uniformity of the reaction system by 25% to 35%, thus significantly increasing the production efficiency of wet-process phosphoric acid.

[0047] 4. Improved quality and yield of wet-process phosphoric acid products: The efficient and uniform reaction significantly improves the quality of wet-process phosphoric acid products, reducing impurity content and increasing compositional stability. In practical applications, phosphogypsum produced using this system exhibits superior performance in building materials and other fields.

[0048] This utility model's three-stage aeration system for reactants effectively solves the problems of solid particle suspension, sedimentation, and accumulation, comprehensively improving the quality and yield of wet-process phosphoric acid production, and has extremely high practical value and promotion significance.

[0049] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any changes made based on the design principles of this utility model, or any non-creative changes made on this basis, shall fall within the scope of protection of this utility model.

Claims

1. A three-stage reactant material aeration system, characterized by, It includes a primary aeration device (1) with the inlet connected to the feed, a secondary reaction pipe (2) with the inlet connected to the outlet of the primary aeration device via a transition pipe (3), a secondary aeration mechanism (10) located at the head end of the secondary reaction pipe (2), a tertiary reaction pipe (4) with the inlet connected to the outlet of the secondary reaction pipe (2) via a transition pipe (3), a tertiary aeration mechanism (20) located at the head end of the tertiary reaction pipe (4), a compression pipe (5) located at the tail end of the tertiary reaction pipe (4), and a discharge pipe (6) connected to the compression pipe (5).

2. The three-stage reactant material aeration system of claim 1, wherein, The primary aeration device (1) adopts a Venturi aerator.

3. The three-stage reactant material aeration system of claim 1, wherein, The length of the tertiary reaction tube (4) is 1.6 to 1.8 times the length of the secondary reaction tube (2).

4. The three-stage reactant material aeration system of claim 1, wherein, The inner diameter of the tertiary reaction tube (4) is not less than the inner diameter of the secondary reaction tube (2).

5. The tertiary reaction mass aeration system of claim 1, wherein, The compression tube (5) is a cone shape with a large inlet and a small outlet. The inlet of the compression tube (5) is directly connected to the outlet at the tail end of the three-stage reaction tube (4).

6. The three-stage reactant material aeration system according to any one of claims 1 to 5, characterized in that, The secondary aeration mechanism (10) includes an aeration distribution ring (11) fitted onto the transition pipe (1) at the beginning of the secondary reaction pipe (2), an air supply port (12) set on the outer wall of the aeration distribution ring (11), a plurality of aeration outlet pipes (13) connected between the aeration distribution ring (11) and the beginning of the secondary reaction pipe (2) and evenly distributed in a circle, and an aeration head (14) installed at the end of the aeration outlet pipe (13) and performing aeration in the secondary reaction pipe (2).

7. The three-stage reactant material aeration system of claim 6, wherein, The secondary aeration mechanism (10) has 2-4 aeration outlet pipes (13).

8. The tertiary reaction mass aeration system of claim 6, wherein, The three-stage aeration mechanism (20) has the same structure as the two-stage aeration mechanism (10), wherein the aeration distribution ring (11) is fitted on the transition pipe (3) at the head end of the three-stage reaction pipe (4), and the number of aeration heads (14) in the three-stage aeration mechanism (20) is greater than that in the two-stage aeration mechanism (10).

9. The tertiary reaction mass aeration system of claim 8, wherein, The three-stage aeration mechanism (20) is configured with 4-6 aeration heads (14).

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