Phosphogypsum solid waste treatment device and treatment method

Abstract

The invention discloses an ardealite solid waste treatment device and method, and relates to the technical field of ardealite solid waste treatment.The ardealite solid waste treatment device comprises a fastener, a first water washing tank, a second water washing tank and a third water washing tank are cooperatively installed in the fastener, the third water washing tank comprises a water washing box and a filtering frame, and a top box is cooperatively installed on the upper side of the water washing box; a feeding opening is formed in one side of the top box, the feeding opening communicates with the interior of the washing box, an air pump is installed on the upper side of the top box in a matched mode, an extrusion cavity is formed in the top box, the air pump communicates with the extrusion cavity through a first connecting pipe, a filtering plate is installed in a filtering frame in a matched mode, and the filtering frame and the extrusion cavity are arranged in a matched mode. According to the method, the current mode of washing the phosphogypsum by using a large amount of clear water is abandoned, and three modes of washing, pickling and neutralizing the phosphogypsum are completed in a multi-stage washing mode, so that impurities in the phosphogypsum can be effectively reduced, and the treatment flow length of the phosphogypsum is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphogypsum solid waste treatment, and particularly to a phosphogypsum solid waste treatment device and a treatment method. Background Art

[0002] Phosphogypsum is a by-product generated in the production process of wet-process phosphoric acid industry, mainly composed of calcium sulfate dihydrate (CaSO4·2H2O), and at the same time contains a small amount of unreacted phosphorus, fluorine compounds, heavy metals (such as cadmium, lead) and radioactive elements (such as uranium, radium) and other impurities.

[0003] In the current phosphogypsum recovery and treatment process, a rough treatment mode of putting phosphogypsum into a large cleaning tank for water washing and precipitation is generally adopted. This method has significant defects: First, in the static water washing process, the solid-liquid contact efficiency is low, resulting in a treatment cycle of up to several hours, and repeated water replacement is required, with huge energy consumption and water resource consumption; Second, the separation effect of traditional gravity precipitation on micron-sized particles and adherent impurities (such as soluble phosphorus, fluoride and heavy metal ions) is poor, seriously restricting its compliance application in the fields of building materials, agriculture and the like. Summary of the Invention

[0004] In order to solve the problem of incomplete treatment of phosphogypsum solid waste proposed in the above background art, the purpose of the present invention is to provide a phosphogypsum solid waste treatment device and a treatment method.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A phosphogypsum solid waste treatment device includes fasteners, and a first water washing tank, a second water washing tank and a third water washing tank are cooperatively installed inside the fasteners; the first water washing tank, the second water washing tank and the third water washing tank have the same structure, and the second water washing tank is located between the first water washing tank and the third water washing tank;

[0006] The third water washing tank includes a water washing box and a filter frame. A top box is cooperatively installed on the upper side of the water washing box. A feed port is opened on one side of the top box, and the feed port is communicated with the inside of the water washing box. An air pump is cooperatively installed on the upper side of the top box. An extrusion cavity is opened on the top box, and the air pump is communicated with the extrusion cavity through a first connecting pipe. A filter plate is cooperatively installed inside the filter frame, and the filter frame is cooperatively arranged with the extrusion cavity.

[0007] Preferably, an upper stirring cavity and a lower stirring cavity are provided inside the water washing box, and the cross-sectional area of the lower stirring cavity is smaller than that of the upper stirring cavity; a connecting plate is cooperatively installed on one side of the water washing box, and the lower end of the water washing box is connected to the connecting plate through a second connecting pipe; a slurry pump is cooperatively installed on the second connecting pipe, and the slurry pump is fixedly installed on the water washing box.

[0008] Preferably, a first stirring motor is cooperatively installed outside the water washing tank. The first stirring motor is drivingly connected to a plurality of stirring rods which are located inside the water washing tank. The stirring rods are designed with hollow structures.

[0009] Preferably, a rotating shaft is cooperatively installed on the water washing tank. The rotating shaft is located in the lower stirring cavity. A second stirring motor is cooperatively installed on one side of the water washing tank. The second stirring motor is drivingly connected to the rotating shaft, and a plurality of stirring blades are cooperatively installed on the rotating shaft.

[0010] Preferably, two oppositely arranged guiding plates are cooperatively installed inside the water washing tank. The filter frame is slidably cooperated with the guiding plates.

[0011] Preferably, a hydraulic cylinder is fixedly connected inside the top box through a fixing plate. The hydraulic cylinder is drivingly connected to a scraping member which is correspondingly cooperated with the filter frame. A sealing groove is cooperatively installed in the extrusion cavity. The filter frame is correspondingly cooperated with the sealing groove.

[0012] Preferably, a coiling bin is cooperatively installed above the top box. A servo motor is cooperatively installed on one side of the coiling bin. The servo motor is cooperated with the coiling bin. A pulling rope is arranged inside the coiling bin. The pulling rope extends below the top box, and the lower end of the pulling rope is cooperatively installed on the filter frame.

[0013] Preferably, a water inlet pipe and a water outlet pipe are cooperatively installed inside the water washing tank. The water inlet pipe is located above the water outlet pipe. A discharge port is cooperatively installed on the top box. The discharge port is cooperated with the scraping member.

[0014] Preferably, the scraping member includes a scraping plate and a material guiding plate. The material guiding plate is located above the scraping plate. A plurality of scraping protrusions are arranged on the lower side of the scraping plate. End plates are cooperatively installed at both ends of the scraping plate and the material guiding plate.

[0015] Both the scraping plate and the material guiding plate are arc-shaped plates. One end of the filter plate is arc-shaped. The scraping plate is correspondingly cooperated with the end of the filter plate with an arc shape.

[0016] The present invention includes a method for treating phosphogypsum solid waste. The method steps are as follows:

[0017] S1. First, put the phosphogypsum into the water washing tank through the feed inlet of the first water washing tank, then fill the water washing liquid into the water washing tank through the water inlet pipe, turn on the corresponding first stirring motor to make the stirring rods stir the liquid in the upper stirring cavity, turn on the second stirring motor, and stir the liquid in the lower stirring cavity through the stirring blades to fully stir it.

[0018] S2. After the stirring is completed, control the length of the pulling rope extended from the coiling bin by the servo motor, so that the filter box descends and falls into the lower stirring cavity due to its own gravity, separating the upper stirring cavity from the lower stirring cavity. At this time, turn on the slurry pump to pump the liquid in the lower stirring cavity into the upper stirring cavity, reducing the pressure in the lower stirring cavity. As a result, the liquid in the upper stirring cavity passes through the filter plate and enters the lower stirring cavity, and during this process, a large amount of phosphogypsum is left on the filter plate.

[0019] S3. After a period of time, control the height of the filter box to rise by the servo motor, so that the filter box cooperates with the extrusion cavity. Turn on the air pump to increase the pressure in the extrusion cavity. Through the change of pressure, the liquid content of the phosphogypsum in the filter plate is greatly reduced.

[0020] S4. After a period of time, control the height of the filter box to descend by the servo motor, control the hydraulic cylinder to extend, so that the scraping member is located above the filter plate, and then control the height of the filter box to rise by the servo motor, so that the scraping member inserts into the filter box.

[0021] S5. Control the hydraulic cylinder to extend again. The phosphogypsum on the filter plate is discharged into the second water washing tank through the discharge port by the scraping member for the second water washing (at this time, it is acid washing, and the washing liquid is dilute sulfuric acid). The water washing steps are the same as those in S1 - S4. The phosphogypsum after the second water washing will fall into the third water washing (at this time, it is neutralization water washing, and the washing liquid is lime milk suspension), and finally it is discharged through the discharge port of the third water washing tank.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The present invention abandons the method of using a large amount of clear water to wash phosphogypsum at present, and completes three methods of water washing, acid washing and neutralization washing of phosphogypsum through a multi - stage water washing method. First, the surface - attached impurities (such as phosphorus, fluorine, etc.) are stripped by turbulent water washing, and then the residual phosphorus - fluorine compounds and some heavy metals are dissolved by circulating cleaning with an acidic medium (pH = 3 - 4). Finally, heavy metal ions are precipitated through an alkaline neutralization reaction (pH = 7 - 8). Compared with the current process, the water consumption is reduced, and the treatment cycle is greatly shortened, realizing the single - line conversion from industrial solid waste to compliant building materials.

[0024] 2. When the present invention scoops phosphogypsum from the water-washing tank, it realizes fully mechanized operation without the need for manual assistance. When in use, the height of the filter plate in the water-washing tank is controlled by a servo motor. When the scooping operation is required, first control the filter plate to a preset height to divide the upper stirring cavity from the lower stirring cavity, and filter the liquid in the upper stirring cavity through negative pressure, so that the phosphogypsum remains on the filter plate. After the phosphogypsum is scooped out, then control the filter plate to move into the extrusion cavity, and extrude the excess washing water in the extrusion cavity, so that the liquid content of the phosphogypsum put into the next water-washing tank is greatly reduced, reducing the influence of the residual washing liquid in the phosphogypsum on the liquid in the next water-washing tank; making the present invention more controllable during use; realizing full-process unmanned operation from solid-liquid separation, mechanical dewatering to cross-process pollution control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the basic structure of a phosphogypsum solid waste treatment device of the present invention.

[0026] Figure 2 is a schematic diagram of the installation position of the first stirring motor of a phosphogypsum solid waste treatment device of the present invention.

[0027] Figure 3 is a Figure 2 cross-sectional view of a phosphogypsum solid waste treatment device of the present invention.

[0028] Figure 4 is a schematic diagram of the internal structure of the water-washing tank of a phosphogypsum solid waste treatment device of the present invention.

[0029] Figure 5 is a Figure 4 view from another angle of a phosphogypsum solid waste treatment device of the present invention.

[0030] Figure 6 is a Figure 4 front view of a phosphogypsum solid waste treatment device of the present invention.

[0031] Figure 7 is a schematic diagram of the internal situation when the water-washing tank of a phosphogypsum solid waste treatment device of the present invention is in use.

[0032] Figure 8 is a schematic diagram of the internal structure after precipitation in the water-washing tank of a phosphogypsum solid waste treatment device of the present invention.

[0033] Figure 9 is a schematic diagram of the cooperation relationship between the filter frame and the extrusion cavity of a phosphogypsum solid waste treatment device of the present invention.

[0034] Figure 10 is a schematic diagram of the structure when the scraping member of a phosphogypsum solid waste treatment device of the present invention moves above the filter frame.

[0035] Figure 11 The structural schematic diagram when the scraping member of a phosphogypsum solid waste treatment device of the present invention is inserted into the filter frame.

[0036] Figure 12 The structural schematic diagram when the scraping member of a phosphogypsum solid waste treatment device of the present invention is scraping.

[0037] Figure 13 The relationship schematic diagram of the upper stirring chamber and the lower stirring chamber of a phosphogypsum solid waste treatment device of the present invention.

[0038] Figure 14 The basic structural schematic diagram of the scraping member of a phosphogypsum solid waste treatment device of the present invention.

[0039] In the figure: 101, fastener; 200, first water washing tank; 300, second water washing tank; 400, third water washing tank; 401, water washing box; 402, water inlet pipe; 403, water outlet pipe; 404, guide plate; 405, filter frame; 406, filter plate; 407, top box; 408, servo motor; 409, coiling bin; 410, air pump; 411, first connecting pipe; 412, feed inlet; 414, first stirring motor; 415, second connecting pipe; 416, slurry pump; 417, connecting plate; 418, second stirring motor; 420, stirring rod; 421, stirring blade; 424, upper stirring chamber; 425, lower stirring chamber; 426, rotating shaft; 427, discharge port; 428, pulling rope; 429, hydraulic cylinder; 430, fixing plate; 431, scraping member; 4311, scraping plate; 4312, material guiding plate; 4313, end plate; 432, sealing groove; 433, extrusion chamber: Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figures 1 - 14 shown, a phosphogypsum solid waste treatment device provided in this embodiment includes a fastener 101, and a first water washing tank 200, a second water washing tank 300 and a third water washing tank 400 are fitted and installed inside the fastener 101. The first water washing tank 200, the second water washing tank 300 and the third water washing tank 400 have the same structure. Refer to Figure 1As shown, the second water washing tank 300 is located between the first water washing tank 200 and the third water washing tank 400, and the first water washing tank 200, the second water washing tank 300 and the third water washing tank 400 are arranged adjacent to each other end to end.

[0042] The water washing tanks (the first water washing tank 200, the second water washing tank 300, the third water washing tank 400) include a water washing box 401. An upper stirring cavity 424 and a lower stirring cavity 425 are provided in the water washing box 401. The cross-sectional area of the lower stirring cavity 425 is smaller than that of the upper stirring cavity 424. A connecting plate 417 is fitted and installed on one side of the water washing box 401. The lower end of the water washing box 401 is connected to the connecting plate 417 through a second connecting pipe 415. A slurry pump 416 is fitted and installed on the second connecting pipe 415. The slurry pump 416 is fitted and installed on the water washing box 401. When in use, the liquid in the lower stirring cavity 425 can be transported to the 424 through the slurry pump 416 to realize the cross-flow of the liquid and improve the mixing efficiency of the mixture in the water washing box 401.

[0043] A first stirring motor 414 is fitted and installed outside the water washing box 401. The first stirring motor 414 is drivingly connected with a plurality of stirring rods 420. The stirring rods 420 are located inside the water washing box 401. A rotating shaft 426 is fitted and installed on the water washing box 401. The rotating shaft 426 is located in the lower stirring cavity 425. A second stirring motor 418 is fitted and installed on one side of the water washing box 401. The second stirring motor 418 is drivingly connected with the rotating shaft 426. A plurality of stirring blades 421 are fitted and installed on the rotating shaft 426.

[0044] When granular phosphogypsum and washing liquid are put into the water washing box 401, the first stirring motor 414 and the second stirring motor 418 can realize the rapid mixing of the phosphogypsum and the washing liquid, so that the reaction speed between the two is accelerated. In this embodiment, the number of the first stirring motors 414 is two, and the two can operate alternately to form a turbulent flow in the water washing box 401, thereby improving the mixing speed of the phosphogypsum and the washing liquid. The relatively viscous liquid in the lower stirring cavity 425 is transported to the upper stirring cavity 424 through the slurry pump 416 for stirring here, further improving the stirring effect.

[0045] A top box 407 is fitted and installed on the upper side of the water-washing tank 401. An inlet 412 is provided on one side of the top box 407. The inlet 412 is in communication with the interior of the water-washing tank 401. An air pump 410 is fitted and installed on the upper side of the top box 407. An extrusion chamber 433 is provided on the top box 407. The air pump 410 is in communication with the extrusion chamber 433 through a first connecting pipe 411. Two oppositely arranged guide plates 404 are fitted and installed inside the water-washing tank 401. A filter frame 405 is slidably fitted on one side of the guide plate 404. A filter plate 406 is fitted and installed inside the filter frame 405. The filter frame 405 is slidably arranged with the guide plate 404. A coil storage bin 409 is fitted and installed on the upper side of the top box 407. A servo motor 408 is fitted and installed on one side of the coil storage bin 409. The servo motor 408 is arranged in cooperation with the coil storage bin 409. A pull rope 428 is provided inside the coil storage bin 409. The pull rope 428 extends below the top box 407. The lower end of the pull rope 428 is fitted and installed on the filter frame 405.

[0046] When in use in this embodiment, the height of the filter plate 406 inside the water-washing tank 401 is controlled by the servo motor 408. When the material fishing operation is required, first control the filter plate 406 to a preset height to divide the upper stirring chamber 424 from the lower stirring chamber 425, and filter the liquid in the upper stirring chamber by means of negative pressure, so that the phosphogypsum remains on the filter plate 406. And after fishing out the phosphogypsum, then control the filter plate 406 to move into the extrusion chamber 433 to squeeze out the excess washing water in the extrusion chamber 433.

[0047] A hydraulic cylinder 429 is fixedly connected inside the top box 407 through a fixing plate 430. The hydraulic cylinder 429 is drivingly connected with a scraping member 431. The scraping member 431 is correspondingly arranged with the filter frame 405. The scraping member 431 includes a scraping plate 4311 and a guiding plate 4312. The guiding plate 4312 is located above the scraping plate 4311. A plurality of scraping protrusions are provided on the lower side of the scraping plate 4311. End plates 4313 are fitted and installed at both ends of the scraping plate 4311 and the guiding plate 4312. Both the scraping plate 4311 and the guiding plate 4312 are arc-shaped plates. One end of the filter plate 406 is arc-shaped. The scraping plate 4311 is correspondingly arranged with the end with the arc of the filter plate 406 (refer to Figure 14 shown).

[0048] When in use, referring to Figures 10 - 13 shown, when the scraping member 431 is in use, the scraping plate 4311 will insert into the filter plate 406. The arc-shaped scraping plate 4311 will squeeze the phosphogypsum at one end of the filter plate 406 to one side. At this time, then drive the scraping plate 4311 to displace by the hydraulic cylinder 429, and the phosphogypsum can be extruded from the discharge port 427. During this process, the guiding plate 4312 is used to control the extrusion direction of the phosphogypsum to prevent the phosphogypsum from falling into the water-washing tank 401.

[0049] A sealing groove 432 is fitted inside the extrusion cavity 433, and the filter frame 405 is correspondingly arranged in cooperation with the sealing groove 432. A water inlet pipe 402 and a water outlet pipe 403 are fitted inside the water washing tank 401. The water inlet pipe 402 is located above the water outlet pipe 403. A discharge port 427 is fitted on the top box 407, and the discharge port 427 is arranged in cooperation with the scraping member 431. The discharge ports 427 of the first water washing tank 200 and the second water washing tank 300 are respectively arranged in corresponding cooperation with the feed ports 412 of the second water washing tank 300 and the third water washing tank 400. The feed port 412 of the first water washing tank 200 is used to input granular phosphogypsum raw materials, and the discharge port 427 of the third water washing tank 400 is used to discharge the phosphogypsum that has completed three-stage water washing. The washed phosphogypsum can be put into the project for use after being calcined.

[0050] This embodiment further includes a method for treating phosphogypsum solid waste, and the steps are as follows:

[0051] S1. First, put the phosphogypsum into the water washing tank 401 through the feed port 412 of the first water washing tank 200 for primary water washing (the purpose is to remove the free acid, soluble phosphorus and fluorine on the surface. At this time, the washing liquid is clear water, and the liquid-solid ratio of the clear water to the phosphogypsum is 3.5:1, and the temperature is normal temperature without heating). Then, fill the water washing tank 401 with clear water through the water inlet pipe 402, turn on the corresponding first stirring motor 414 to make the stirring rod 420 stir the liquid in the upper stirring cavity 424, and turn on the second stirring motor 418 to stir the liquid in the lower stirring cavity 425 through the stirring blade 421 to fully stir it (for the schematic diagram after stirring for a period of time, refer to Figure 7 shown);

[0052] S2. After the stirring is completed, control the length of the pull rope 428 extended by the coiling bin 409 through the servo motor 408, so that the filter frame 405 descends and falls into the lower stirring cavity 425 due to its own gravity, separating the upper stirring cavity 424 from the lower stirring cavity 425. At this time, turn on the slurry pump 416 to pump the liquid in the lower stirring cavity 425 into the upper stirring cavity 424, so that the pressure in the lower stirring cavity 425 decreases, and then the liquid in the upper stirring cavity 424 enters the lower stirring cavity 425 through the filter plate 406. During this process, a large amount of phosphogypsum is left on the filter plate 406 (refer to Figure 8 shown);

[0053] S3. After a period of time, control the height of the filter frame 405 to rise through the servo motor 408, so that the filter frame 405 is matched with the extrusion cavity 433, and turn on the air pump 410 to increase the pressure in the extrusion cavity 433. Through the change of pressure, the liquid content of the phosphogypsum in the filter plate 406 is greatly reduced (refer to Figure 9 shown);

[0054] S4. After a period of time, control the height of the filter box 405 to decrease through the servo motor 408, control the hydraulic cylinder 429 to extend, so that the scraping member 431 is located above the filter plate 406, and then control the height of the filter box 405 to rise through the servo motor 408, so that the scraping member 431 is inserted into the filter box 405 (refer to Figure 10 and Figure 11 shown);

[0055] S5. Refer to Figure 12 and Figure 13 shown, control the hydraulic cylinder 429 to extend again, and discharge the phosphogypsum on the filter plate 406 into the second water washing tank 300 through the scraping member 431 for the second water washing (the purpose is to deeply remove the residual fluorides and some heavy metals. At this time, the washing liquid is dilute sulfuric acid. At this time, the pH value of the dilute sulfuric acid solution is 3.5, and the liquid-solid ratio of the dilute sulfuric acid solution to the phosphogypsum is 2.5:1. The temperature should be set at 50 degrees at this time to increase the solubility of the fluorides. The heating method of inserting a glass heating tank into the water washing tank is adopted). The water washing steps are the same as those in S1-S4. The phosphogypsum after the second water washing of the berries will fall into the third water washing tank 400 for the third water washing (the purpose is to neutralize the residual dilute sulfuric acid solution in the phosphogypsum to ensure that the pH value of the phosphogypsum after water washing meets the standard. At this time, lime milk suspension is also used for water washing. The liquid-solid ratio of the lime milk suspension to the phosphogypsum is 2.5:1, and the temperature is normal temperature. Using lime milk that can be fully integrated with the phosphogypsum for neutralization can make the phosphogypsum directly usable without the need to remove the lime milk). Finally, it is discharged through the discharge port 427 of the third water washing tank 400. Compared with the current method of using a large amount of clean water to wash the phosphogypsum, through the above method, the impurities in the phosphogypsum can be effectively reduced, and the impurities and harmful substances in the phosphogypsum product are greatly reduced, so that the phosphogypsum can be directly put into use.

[0056] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A phosphogypsum solid waste treatment device, characterized in that, It includes a fastener (101), and a first water washing tank (200), a second water washing tank (300) and a third water washing tank (400) are fitted and installed inside the fastener (101); the first water washing tank (200), the second water washing tank (300) and the third water washing tank (400) have the same structure, and the second water washing tank (300) is located between the first water washing tank (200) and the third water washing tank (400); The third water washing tank (400) includes a water washing box (401) and a filter frame (405), a top box (407) is fitted and installed on the upper side of the water washing box (401), a feed inlet (412) is opened on one side of the top box (407), the feed inlet (412) is communicated with the inside of the water washing box (401), an air pump (410) is fitted and installed on the upper side of the top box (407), an extrusion cavity (433) is opened on the top box (407), the air pump (410) is communicated with the extrusion cavity (433) through a first connecting pipe (411), a filter plate (406) is fitted and installed inside the filter frame (405), and the filter frame (405) is arranged in cooperation with the extrusion cavity (433).

2. The phosphogypsum solid waste treatment device according to claim 1, wherein An upper stirring cavity (424) and a lower stirring cavity (425) are provided inside the water washing box (401), and the cross-sectional area of the lower stirring cavity (425) is smaller than that of the upper stirring cavity (424); a connecting plate (417) is fitted and installed on one side of the water washing box (401), and the lower end of the water washing box (401) is connected to the connecting plate (417) through a second connecting pipe (415); a slurry pump (416) is fitted and installed on the second connecting pipe (415), and the slurry pump (416) is fixedly installed on the water washing box (401).

3. A phosphogypsum solid waste treatment device according to claim 1, characterized in that, A first stirring motor (414) is fitted and installed on the outer side of the water washing box (401), the first stirring motor (414) is drivingly connected with a plurality of stirring rods (420), the stirring rods (420) are located inside the water washing box (401), and the stirring rods (420) are designed with hollow openings.

4. A phosphogypsum solid waste treatment device according to claim 1, characterized in that, A rotating shaft (426) is fitted and installed on the water washing box (401), the rotating shaft (426) is located inside the lower stirring cavity (425), a second stirring motor (418) is fitted and installed on one side of the water washing box (401), the second stirring motor (418) is drivingly connected with the rotating shaft (426), and a plurality of stirring blades (421) are fitted and installed on the rotating shaft (426).

5. The phosphogypsum solid waste treatment device according to claim 1, characterized in that, Two oppositely arranged guide plates (404) are fitted and installed inside the water washing box (401), and the filter frame (405) is arranged in sliding cooperation with the guide plates (404).

6. The phosphogypsum solid waste treatment device according to claim 1, wherein, A hydraulic cylinder (429) is fixedly connected inside the top box (407) through a fixing plate (430), the hydraulic cylinder (429) is drivingly connected with a scraping member (431), and the scraping member (431) is arranged in corresponding cooperation with the filter frame (405); a sealing groove (432) is fitted and installed inside the extrusion cavity (433), and the filter frame (405) is arranged in corresponding cooperation with the sealing groove (432).

7. A phosphogypsum solid waste treatment device according to claim 1, characterized in that, A coiling material bin (409) is cooperatively installed on the upper side of the top box (407), a servo motor (408) is cooperatively installed on one side of the coiling material bin (409), and the servo motor (408) is cooperatively arranged with the coiling material bin (409); a pulling rope (428) is arranged in the coiling material bin (409), the pulling rope (428) extends below the top box (407), and the lower end of the pulling rope (428) is cooperatively installed on the filter frame (405).

8. A phosphogypsum solid waste treatment device according to claim 1, characterized in that, A water inlet pipe (402) and a water outlet pipe (403) are cooperatively installed in the water washing box (401), the water inlet pipe (402) is located above the water outlet pipe (403), a discharge port (427) is cooperatively installed on the top box (407), and the discharge port (427) is cooperatively arranged with a scraping member (431).

9. The phosphogypsum solid waste treatment device according to claim 8, characterized in that, The scraping member (431) includes a scraping plate (4311) and a material guiding plate (4312), the material guiding plate (4312) is located above the scraping plate (4311), a plurality of scraping protrusions are arranged on the lower side of the scraping plate (4311), and end plates (4313) are cooperatively installed at both ends of the scraping plate (4311) and the material guiding plate (4312); Both the scraping plate (4311) and the material guiding plate (4312) are arc-shaped plates, one end of the filter plate (406) is arc-shaped, and the scraping plate (4311) is correspondingly cooperatively arranged with the end of the filter plate (406) with an arc.

10. A method for treating phosphogypsum solid waste, which uses a phosphogypsum solid waste treatment device as described in any one of claims 1 to 9, characterized in that, The method steps are as follows: S1. First, put phosphogypsum into the water washing box (401) through the feed inlet (412) of the first water washing tank (200), then fill the water washing box (401) with clear water through the water inlet pipe (402), turn on the corresponding first stirring motor (414) to make the stirring rod (420) stir the liquid in the upper stirring cavity (424), turn on the second stirring motor (418), and stir the liquid in the lower stirring cavity (425) through the stirring blades (421) to fully stir it; S2. After the stirring is completed, control the length of the pulling rope (428) extended from the coiling material bin (409) by the servo motor (408) to make the filter frame (405) descend and fall into the lower stirring cavity (425) due to its own gravity, separating the upper stirring cavity (424) from the lower stirring cavity (425). At this time, turn on the slurry pump (416) to pump the liquid in the lower stirring cavity (425) into the upper stirring cavity (424), reducing the pressure in the lower stirring cavity (425), and then making the liquid in the upper stirring cavity (424) enter the lower stirring cavity (425) after passing through the filter plate (406). During this process, a large amount of phosphogypsum is left on the filter plate (406); S3. After a period of time, control the height of the filter frame (405) to rise by the servo motor (408) to make the filter frame (405) cooperate with the extrusion cavity (433), turn on the air pump (410) to increase the pressure in the extrusion cavity (433), and through the change of pressure, greatly reduce the liquid content of the phosphogypsum in the filter plate (406); S4. After a period of time, control the height of the filter box (405) to decrease through the servo motor (408), control the hydraulic cylinder (429) to extend, so that the scraping member (431) is located above the filter plate (406), and then control the height of the filter box (405) to rise through the servo motor (408), so that the scraping member (431) is inserted into the filter box (405); S5. Control the hydraulic cylinder (429) to extend again, and discharge the phosphogypsum on the filter plate (406) into the second water washing tank (300) through the scraping member (431) through the discharge port (427) for the second water washing (at this time it is acid washing, and the washing liquid is dilute sulfuric acid). The water washing steps are the same as those in S1 - S4. The phosphogypsum washed for the second time of the berries will fall into the third water washing tank (400) for the third water washing (at this time it is neutralization water washing, and the washing liquid is lime milk suspension), and finally be discharged through the discharge port (427) of the third water washing tank (400).

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