Ardealite harmless treatment device and treatment method based on multi-agent cooperation

Abstract

The invention belongs to the technical field of phosphogypsum harmless treatment equipment, and discloses a phosphogypsum harmless treatment device and method based on multi-agent cooperation. The phosphogypsum harmless treatment device based on multi-agent cooperation comprises a tank body, a feeding hopper is installed at the top of the tank body, a discharging structure is arranged at the bottom of the tank body, a first driving motor and a second driving motor are fixedly installed in the middle and the edge of one end face of the tank body correspondingly, and a material turning mechanism and a stirring mechanism are arranged in the tank body correspondingly; and the stirring mechanism is driven by the driving motor I to stir the raised materials in the tank body. According to the phosphogypsum harmless treatment device and treatment method based on multi-agent cooperation, through the design of the material turning mechanism, the stirring mechanism and the air blast mechanism, in the material mixing process, compressed air can be continuously utilized for raising materials to achieve combination of pneumatic mixing and contact mixing, high-speed airflow can hit caked materials, and the treatment effect is good. The high-efficiency mixing of the materials is realized, and the problems in the background technology are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of harmless treatment equipment for phosphogypsum, and in particular to a harmless treatment device and method for phosphogypsum based on multi-agent combination. Background Art

[0002] Phosphogypsum is a by-product of the wet process of producing phosphoric acid. Its main component is calcium sulfate dihydrate. It is powdery and contains 10-20 percent of free water, so it is easy to clump.

[0003] The composition of phosphogypsum is relatively complex. In addition to calcium sulfate, there are also incompletely decomposed phosphate ore, residual phosphoric acid, fluoride, acid insoluble matter, organic matter, etc. Among them, the presence of fluorine and organic matter has the greatest impact on the resource utilization of phosphogypsum. The random discharge and accumulation of phosphogypsum has seriously damaged the ecological environment, not only polluting groundwater resources, but also causing waste of land resources.

[0004] There are mainly modification, drying and calcination methods for harmless treatment of phosphogypsum. The so-called modification is to add reagents to phosphogypsum to react chemically with harmful substances such as phosphorus and fluorine, remove the influence of phosphorus and fluorine on cement hydration, and prepare cement retarder. The main processing equipment in this treatment is mixing equipment and granulating equipment. Due to the easy agglomeration of phosphogypsum, in order to ensure the full mixing of phosphogypsum and reagents, the performance of the mixing equipment has a great influence on the production efficiency. When existing equipment is mixing materials, it is easy for the agglomerated materials to follow the movement of the stirring rod and cannot be fully mixed, resulting in low efficiency. Therefore, we propose a harmless treatment device and method for phosphogypsum based on multi-agent combination. Summary of the invention

[0005] The object of the present invention is to provide a device and method for harmless treatment of phosphogypsum based on the combination of multiple agents, which solve the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a harmless treatment device for phosphogypsum based on multi-agent combination, comprising a tank body, a feeding hopper is installed on the top of the tank body, a discharging structure is arranged at the bottom of the tank body, a driving motor 1 and a driving motor 2 are fixedly installed at the middle and edge of one end face of the tank body respectively, a turning mechanism and a stirring mechanism are respectively arranged in the tank body, the stirring mechanism is driven by the driving motor 1 to stir the material lifted in the tank body, and the turning mechanism is driven by the driving motor 2 to turn over the material falling on the inner wall of the tank body, and a plurality of air impulse mechanisms are installed on both side walls of the tank body, and the air impulse mechanisms are powered by compressed air to mix the material in the tank body.

[0007] The stirring mechanism includes a stirring rod and a blade group. The two ends of the stirring rod are movably connected to the two end surfaces of the tank body respectively. The output end of the driving motor is fixedly connected to one end of the stirring rod. A plurality of blade groups are installed on the stirring rod and in the tank body. The blade group is composed of a plurality of blades arranged in a ring. When rotating, it drives the air in the tank body to flow and extract the lifted materials for mixing.

[0008] Preferably, the flipping mechanism includes two mounting rings, a flip plate, an internal gear, a scraper plate and a connecting ring. The two mounting rings are movably connected to the inner wall of the tank body through bearings. The opposite sides of the two mounting rings are fixedly connected through a flip plate. One side of the flip plate contacts the inner wall of the tank body. An internal gear is fixedly installed on the inner wall of the mounting ring close to the second driving motor. The driving gear on the output end of the second driving motor engages with the internal gear to drive the mounting ring to rotate. The inner wall of the mounting ring away from the second driving motor is fixedly connected to the outer wall of the connecting ring through a scraper plate, and one side of the scraper plate contacts an end face of the tank body.

[0009] Preferably, the angle between the flap and the inner wall of the tank is 60°-90°, and the number of the flaps is not less than three and they are arranged in a ring with the axis of the mounting ring as a reference.

[0010] Preferably, the air impulse mechanism includes an air cylinder, a solenoid valve and an air pipe. The air cylinder is a tubular structure with one end open and the other end closed, and the open end of the air cylinder is fixedly connected to the side wall of the tank body and communicated with the tank body. The bottom wall of the air cylinder is equipped with a solenoid valve, the outlet of the solenoid valve is communicated with the inside of the air cylinder, and the inlet of the solenoid valve is fixedly connected to the air pipe, and compressed gas is connected through the air pipe.

[0011] Preferably, the number of air impulse mechanisms on the two side walls of the tank body is the same and they are symmetrically arranged, the inner bottom wall of the air cylinder is funnel-shaped, and the air cylinder is inclined and its opening points to the upper side of the stirring rod.

[0012] Preferably, a medicine hopper is fixedly installed on one side wall of the tank body, the medicine hopper is on the upper side of the air impulse mechanism, the feed end of the discharge pipe is fixedly connected to the position of the bottom wall of the medicine hopper corresponding to the air cylinder, and the discharge end of the discharge pipe is fixedly connected to the outer wall of the air cylinder and communicated with the inside of the air cylinder.

[0013] Preferably, a sliding groove is provided on the inner wall of the air cylinder and on the side of the discharge pipe close to the solenoid valve, a sliding block is slidably connected in the sliding groove, the side of the sliding block away from the discharge pipe is connected to the inner wall of the sliding groove through a tension spring, a mask is fixedly connected to the sliding block, the mask is L-shaped, and the side of the mask connected to the sliding block is in contact with the inner wall of the air cylinder.

[0014] Preferably, the material discharging structure includes a material guide plate, a shielding cloth, a cylinder and a limit column. One end of the material guide plate is movably connected to the bottom of the tank body by a hinge, and the material guide plate is embedded in a rectangular opening at the bottom of the tank body. The material in the tank body can be released after the material guide plate is detached from the opening at the bottom of the tank body, and both sides of the lower surface of the material guide plate are connected to the bottom of the tank body through the shielding cloth. Two cylinders are fixedly installed on the bottom of the tank body and are respectively arranged on both sides of the material guide plate. A limit column is fixedly installed between the output ends of the two cylinders, and the limit column is in contact with the lower surface of the material guide plate.

[0015] A treatment method for harmless treatment of phosphogypsum based on multi-agent combination: the treatment method is as follows: Step 1: Preparation of mixed treatment agent: take 20-25 parts of pH regulator, 12-15 parts of particle adsorption capture agent, 1-5 parts of passivator and 1-5 parts of supplementer by weight, and preliminarily mix them as mixed treatment agent; Step 2: Phosphogypsum treatment, the mixed treatment agent in step 1 and the phosphogypsum to be treated are respectively put into the phosphogypsum harmless treatment device based on multi-agent combination, the ratio of the mixed treatment agent to the phosphogypsum is 1:10, the phosphogypsum is put into the feeding hopper, the mixed treatment agent is put into the agent hopper according to the ratio, the air pipe is connected to the compressed gas, the drive motor 1 and the drive motor 2 are started, the mounting ring drives the flip plate to rotate, the stirring rod drives the blade group to rotate to generate axial airflow, the phosphogypsum is replaced into the air cylinder during the movement of the flip plate, the solenoid valve is rhythmically opened and closed, the mixed treatment agent and the phosphogypsum in the air cylinder are blown out and scattered, collide and mix above the stirring rod, are mixed by the airflow generated by the rotation of the blade group during the falling process, blown on the inner wall of the tank body and scraped off by the scraper plate, and then replaced by the flip plate into the air cylinder for circulation and mixing; When discharging, the cylinder moves to drive the limit column downward, and the guide plate falls to open the bottom opening of the tank, and the material is discharged. After the material is discharged, the staff cleans the guide plate, and the cylinder retracts to lift the guide plate to mix the next batch of phosphogypsum with the agent.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are: 1. The harmless treatment device and method for phosphogypsum based on multi-agent combination, through the design of the turning mechanism, stirring mechanism and air impulse mechanism, can continuously use compressed gas to lift the material during the material mixing process to achieve the combination of pneumatic mixing and contact mixing. The high-speed airflow can break up the agglomerated materials and achieve high-efficiency mixing of the materials, thus solving the problems raised in the background technology.

[0017] 2. The harmless treatment device and method for phosphogypsum based on the combination of multiple agents utilizes the design of the agent hopper. The agents put into the agent hopper can be blown into the tank body by the air impingement mechanism, and the phosphogypsum blown out by the relative air impingement mechanism is counteracted. At the same time, the axial airflow generated by the stirring mechanism is combined to perform further pneumatic mixing to enhance the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a cross-sectional view of the tank body of the present invention; Figure 3 A top view of the present invention; Figure 4 For the present invention Figure 3 Middle AA section; Figure 5 For the present invention Figure 4 The enlarged view of point D in the middle; Figure 6 For the present invention Figure 4 The enlarged view of point B in the middle; Figure 7 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 8 It is a structural schematic diagram of the discharging structure of the present invention.

[0019] In the figure: 1. tank body; 2. feeding hopper; 3. discharging structure; 31. guide plate; 32. shielding cloth; 33. cylinder; 34. limit column; 4. driving motor 1; 5. driving motor 2; 6. turning mechanism; 61. mounting ring; 62. turning plate; 63. internal gear; 64. scraper plate; 65. connecting ring; 7. stirring mechanism; 71. stirring rod; 72. blade group; 8. air impulse mechanism; 81. air cylinder; 82. solenoid valve; 83. air pipe; 9. medicine hopper; 10. discharge pipe; 11. sliding groove; 12. sliding block; 13. tension spring; 14. shield; 15. shield; 16. arc groove; 17. limit block; 18. compression spring; 19. driving gear. DETAILED DESCRIPTION

[0020] See also Figure 1-8The present invention provides a technical solution: a harmless treatment device for phosphogypsum based on multi-agent combination, comprising a tank body 1, a hopper 2 is installed on the top of the tank body 1, and shields 15 are movably connected to both sides of the entrance of the hopper 2 through hinges, the shield 15 is a filter structure, which is breathable and can block materials to prevent materials from escaping from the tank body 1, and the two shields 15 can be combined to close the entrance of the hopper 2, an arc groove 16 is provided on the inner wall of the hopper 2, a limiting block 17 is slidably connected in the arc groove 16, and one end of the limiting block 17 extends out of the arc groove 16 and contacts with the lower surface of the shield 15, and the side of the limiting block 17 away from the shield 15 is connected to the side wall of the arc groove 16 through a compression spring 18, when materials are fed into the hopper 2, the materials can press down the shield 15 to fall into the tank body 1, and the design of the shield 15 can prevent the materials from escaping from the tank body 1 following the high-speed airflow in the tank body 1.

[0021] See also Figure 6 , 8 A discharging structure 3 is provided at the bottom of the tank body 1, and the discharging structure 3 includes a guide plate 31, a shielding cloth 32, a cylinder 33 and a limiting column 34. One end of the guide plate 31 is movably connected to the bottom of the tank body 1 through a hinge, and the guide plate 31 is embedded in the rectangular opening at the bottom of the tank body 1. The guide plate 31 can release the material in the tank body 1 after it is separated from the bottom opening of the tank body 1, and the two sides of the lower surface of the guide plate 31 are connected to the bottom of the tank body 1 through the shielding cloth 32. The design of the shielding cloth 32 can prevent the mixed material from leaking from the two sides of the guide plate 31 during discharging. When the discharging is completed, the staff needs to clean the residual mixed material on the guide plate 31. Two cylinders 33 are fixedly installed at the bottom of the tank body 1 and are respectively arranged on both sides of the guide plate 31. A limiting column 34 is fixedly installed between the output ends of the two cylinders 33, and the limiting column 34 contacts the lower surface of the guide plate 31.

[0022] See also Figure 1-2 A driving motor 1 4 and a driving motor 2 5 are fixedly installed at the middle and edge of one end surface of the tank body 1, respectively. A material turning mechanism 6 and a stirring mechanism 7 are respectively arranged in the tank body 1. The stirring mechanism 7 is driven by the driving motor 1 4 to stir the material lifted in the tank body 1, and the material turning mechanism 6 is driven by the driving motor 2 5 to turn over the material falling on the inner wall of the tank body 1. A plurality of air impact mechanisms 8 are installed on both side walls of the tank body 1. The number of the air impact mechanisms 8 on the two side walls of the tank body 1 is the same and they are symmetrically arranged. The air impact mechanism 8 is powered by compressed air to mix the material in the tank body 1.

[0023] See also Figure 2 , 4The turning mechanism 6 includes two mounting rings 61, a turning plate 62, an inner gear 63, a scraper plate 64 and a connecting ring 65. The two mounting rings 61 are movably connected to the inner wall of the tank body 1 through bearings. The opposite sides of the two mounting rings 61 are fixedly connected through the turning plates 62. The number of the turning plates 62 is not less than three and is arranged in a ring with the axis of the mounting ring 61 as a reference. One side of the turning plate 62 contacts the inner wall of the tank body 1, and the angle between the turning plate 62 and the inner wall of the tank body 1 is 60°-90°. Figure 2 As described, the mounting ring 61 rotates clockwise, and the inclined flip plate 62 can drive the material to move to the upper left, so that the material enters the air cylinder 81 and is blown out of the air by the air impulse mechanism 8 to form a cycle. An internal gear 63 is fixedly installed on the inner wall of the mounting ring 61 close to the driving motor 25, and the driving gear 19 on the output end of the driving motor 25 is meshed with the internal gear 63 to drive the mounting ring 61 to rotate. The inner wall of the mounting ring 61 away from the driving motor 25 is fixedly connected to the outer wall of the connecting ring 65 through a scraper plate 64, and one side of the scraper plate 64 is in contact with an end surface inside the tank body 1.

[0024] See also Figure 2 The stirring mechanism 7 includes a stirring rod 71 and a blade group 72. The two ends of the stirring rod 71 are movably connected to the two end surfaces of the tank body 1 respectively. The output end of the driving motor 4 is fixedly connected to one end of the stirring rod 71. A plurality of blade groups 72 are installed on the stirring rod 71 and in the tank body 1. The blade group 72 is composed of a plurality of blades arranged in a ring. When it rotates, it drives the air flow in the tank body 1 to extract the raised materials for mixing. When the stirring rod 71 rotates clockwise, the airflow is blown to the position of the scraper plate 64. The materials blown on the inner wall of the tank body 1 following the airflow can be hung down by the scraper plate 64 to avoid the materials hanging on the wall and affecting the mixing.

[0025] See also Figure 1 , 7 The gas impulse mechanism 8 includes an air cylinder 81, an electromagnetic valve 82 and an air pipe 83. The air cylinder 81 is a tubular structure with one end open and the other end closed, and the open end of the air cylinder 81 is fixedly connected to the side wall of the tank body 1 and communicated with the inside of the tank body 1. The bottom wall of the air cylinder 81 is installed with an electromagnetic valve 82, the outlet of the electromagnetic valve 82 is communicated with the inside of the air cylinder 81, and the inlet of the electromagnetic valve 82 is fixedly connected with the air pipe 83, and the compressed gas is connected through the air pipe 83.

[0026] The inner bottom wall of the air cylinder 81 is designed in a funnel shape, which can reduce the generation of chaotic airflow in the air cylinder 81. The air cylinder 81 is arranged at an angle and its opening points to the upper side of the stirring rod 71.

[0027] A medicine hopper 9 is fixedly installed on one side wall of the tank body 1. The medicine hopper 9 is on the upper side of the air impingement mechanism 8. The feed end of a discharge pipe 10 is fixedly connected to the position of the bottom wall of the medicine hopper 9 corresponding to the air cylinder 81. The discharge end of the discharge pipe 10 is fixedly connected to the outer wall of the air cylinder 81 and communicates with the inside of the air cylinder 81.

[0028] A sliding groove 11 is provided on the inner wall of the air cylinder 81 and on the side of the discharge pipe 10 close to the solenoid valve 82. A sliding block 12 is slidably connected to the sliding groove 11. The side of the sliding block 12 away from the discharge pipe 10 is connected to the inner wall of the sliding groove 11 through a tension spring 13. A shielding piece 14 is fixedly connected to the sliding block 12. The shielding piece 14 is L-shaped, and the side of the shielding piece 14 connected to the sliding block 12 is in contact with the inner wall of the air cylinder 81. The design of the shielding piece 14 enables it to follow the movement when it is impacted by a high-speed airflow, blocking the outlet of the discharge pipe 10 and preventing the high-speed airflow from entering the medicine hopper 9. After the shielding piece 14 is reset, it will not affect the medicine from falling into the air cylinder 81 through the discharge pipe 10.

[0029] When the device is working, phosphogypsum is put into the feeding hopper 2, and the shield 15 is opened due to the pressure of the phosphogypsum, and the phosphogypsum enters the tank body 1, the compression spring 18 rebounds, the two shields 15 merge, the feeding hopper 2 is closed, and the mixed treatment agent is put into the agent hopper 9 according to the proportion, the air pipe 83 is connected to the compressed gas, the driving motor 1 4 and the driving motor 2 5 are started, the mounting ring 61 drives the flip plate 62 to rotate, the stirring rod 71 drives the blade group 72 to rotate to generate axial airflow, the phosphogypsum is replaced into the air cylinder 81 during the movement of the flip plate 62, and the electromagnetic valve 82 is opened and closed rhythmically. The mixed treatment agent and phosphogypsum in the air cylinder 81 are blown out and broken up, and collide and mix above the stirring rod 71. During the falling process, the blade group 72 rotates to generate an airflow to entrain and mix, blown onto the inner wall of the tank body 1, and are scraped off by the scraper plate 64, and then replaced by the flip plate 62 into the air cylinder 81 for circulation and mixing. When discharging, the cylinder 33 moves to drive the limit column 34 to move downward, and the guide plate 31 falls to open the bottom opening of the tank body 1, and the material is discharged. After the material is discharged, the staff cleans the guide plate 31, and the cylinder 33 retracts to lift the guide plate 31 to mix the next batch of phosphogypsum and the agent.

[0030] The technical solution also provides a method for preparing a mixed treatment agent, which is obtained by preliminary mixing 20-25 parts of a pH regulator, 12-15 parts of a particle adsorption capture agent, 1-5 parts of a passivator, and 1-5 parts of a supplement, wherein the pH regulator is a mixture of magnesium carbonate and lime, the passivator is a mixture of calcium chloride, polyaluminum chloride, and polyacrylamide, and the supplement is modified asbestos.

[0031] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A harmless treatment device for phosphogypsum based on multi-agent combination, comprising a tank body, a feeding hopper is installed on the top of the tank body, a discharging structure is provided at the bottom of the tank body, and a driving motor 1 and a driving motor 2 are fixedly installed at the middle and edge of an end surface of the tank body, respectively, characterized in that: The tank body is provided with a material turning mechanism and a stirring mechanism, the stirring mechanism is driven by a driving motor 1 to stir the material lifted up in the tank body, and the material turning mechanism is driven by a driving motor 2 to turn over the material falling on the inner wall of the tank body. A plurality of air impact mechanisms are installed on both side walls of the tank body, and the air impact mechanisms are powered by compressed air to mix the material in the tank body. The stirring mechanism includes a stirring rod and a blade group. The two ends of the stirring rod are movably connected to the two end surfaces of the tank body respectively. The output end of the driving motor is fixedly connected to one end of the stirring rod. A plurality of blade groups are installed on the stirring rod and in the tank body. The blade group is composed of a plurality of blades arranged in a ring. When rotating, it drives the air in the tank body to flow and extract the lifted materials for mixing.

2. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 1 is characterized in that: The flipping mechanism includes two mounting rings, a flipping plate, an inner gear, a scraper plate and a connecting ring. The two mounting rings are movably connected to the inner wall of the tank body through bearings. The opposite sides of the two mounting rings are fixedly connected through a flipping plate. One side of the flipping plate contacts the inner wall of the tank body. An inner gear is fixedly installed on the inner wall of the mounting ring close to the second driving motor. The driving gear on the output end of the second driving motor meshes with the inner gear to drive the mounting ring to rotate. The inner wall of the mounting ring away from the second driving motor is fixedly connected to the outer wall of the connecting ring through a scraper plate, and one side of the scraper plate contacts an end face of the tank body.

3. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 2 is characterized in that: The angle between the flap and the inner wall of the tank is 60°-90°, and the number of the flap is not less than three and they are arranged in a ring with the axis of the mounting ring as a reference.

4. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 1 is characterized in that: The air impulse mechanism includes an air cylinder, a solenoid valve and an air pipe. The air cylinder is a tubular structure with one end open and the other end closed, and the open end of the air cylinder is fixedly connected to the side wall of the tank body and communicated with the tank body. The bottom wall of the air cylinder is installed with a solenoid valve, the outlet of the solenoid valve is communicated with the inside of the air cylinder, and the inlet of the solenoid valve is fixedly connected with the air pipe, and compressed gas is connected through the air pipe.

5. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 4 is characterized in that: The number of air impulse mechanisms on the two side walls of the tank body is the same and they are symmetrically arranged. The inner bottom wall of the air cylinder is designed in a funnel shape. The air cylinder is inclined and its opening points to the upper side of the stirring rod.

6. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 4 is characterized in that: A medicine hopper is fixedly installed on one side wall of the tank body, and the medicine hopper is located on the upper side of the air impingement mechanism. The feed end of the discharge pipe is fixedly connected to the position of the bottom wall of the medicine hopper corresponding to the air cylinder, and the discharge end of the discharge pipe is fixedly connected to the outer wall of the air cylinder and communicated with the inside of the air cylinder.

7. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 6 is characterized in that: A sliding groove is provided on the inner wall of the air cylinder and on the side of the discharge pipe close to the solenoid valve. A sliding block is slidably connected in the sliding groove. The side of the sliding block away from the discharge pipe is connected to the inner wall of the sliding groove through a tension spring. A mask is fixedly connected to the sliding block. The mask is L-shaped, and the side of the mask connected to the sliding block is in contact with the inner wall of the air cylinder.

8. The harmless treatment device for phosphogypsum based on multi-agent combination according to claim 1 is characterized in that: The material discharging structure includes a material guide plate, a shielding cloth, a cylinder and a limit column. One end of the material guide plate is movably connected to the bottom of the tank body by a hinge, and the material guide plate is embedded in a rectangular opening at the bottom of the tank body. The material in the tank body can be released after the material guide plate is detached from the opening at the bottom of the tank body, and the two sides of the lower surface of the material guide plate are connected to the bottom of the tank body through the shielding cloth. Two cylinders are fixedly installed on the bottom of the tank body and are respectively arranged on both sides of the material guide plate. A limit column is fixedly installed between the output ends of the two cylinders, and the limit column is in contact with the lower surface of the material guide plate.

9. The treatment method of phosphogypsum harmless treatment device based on multi-agent combination according to any one of claims 1 to 8, characterized in that: The processing method is as follows: Step 1: Preparation of mixed treatment agent: 20-25 parts of pH regulator, 12-15 parts of particle adsorption capture agent, 1-5 parts of passivation agent and 1-5 parts of supplement are taken by weight, and preliminarily mixed as mixed treatment agent; Step 2: Phosphogypsum treatment, the mixed treatment agent in step 1 and the phosphogypsum to be treated are respectively put into the phosphogypsum harmless treatment device based on multi-agent combination, the ratio of the mixed treatment agent to the phosphogypsum is 1:10, the phosphogypsum is put into the feeding hopper, the mixed treatment agent is put into the agent hopper according to the ratio, the air pipe is connected to the compressed gas, the drive motor 1 and the drive motor 2 are started, the mounting ring drives the flip plate to rotate, the stirring rod drives the blade group to rotate to generate axial airflow, the phosphogypsum is replaced into the air cylinder during the movement of the flip plate, the solenoid valve is rhythmically opened and closed, the mixed treatment agent and the phosphogypsum in the air cylinder are blown out and scattered, collide and mix above the stirring rod, are mixed by the airflow generated by the rotation of the blade group during the falling process, blown on the inner wall of the tank body and scraped off by the scraper plate, and then replaced by the flip plate into the air cylinder for circulation and mixing; When discharging, the cylinder moves to drive the limit column downward, and the guide plate falls to open the bottom opening of the tank, and the material is discharged. After the material is discharged, the staff cleans the guide plate, and the cylinder retracts to lift the guide plate to mix the next batch of phosphogypsum with the agent.

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