Phosphogypsum washing wastewater purification treatment device and method

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly discloses a water-washing phosphogypsum wastewater purification treatment device and method.The water-washing phosphogypsum wastewater purification treatment device comprises an aeration tank, a collecting assembly used for collecting floating foam wastewater is arranged at the upper end of the aeration tank, and the collecting assembly comprises a base fixedly installed at the center of the aeration tank; a first transmission shaft is rotatably connected to the upper end of the base, a first belt pulley is fixedly mounted at the upper end of the first transmission shaft, and the collection assembly is arranged at the upper end of the aeration tank and is matched with a transmission structure of the motor and the belt pulley, so that continuous scraping of floating foam is realized; meanwhile, a two-section limiting groove formed by a first limiting plate and a second limiting plate is matched with an extrusion shaft to drive a scraper to incline to directionally guide floating foam to a separation bin, so that the problems of low floating foam collection efficiency and difficulty in directional conveying in the prior art are solved, manual operation is replaced, the labor intensity is reduced, and it is ensured that the floating foam is not detained or overflowed; and a basis is provided for subsequent floating foam treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to a water-washed phosphogypsum wastewater purification treatment device and method. BACKGROUND

[0002] In the phosphorus chemical industry, water-washed phosphogypsum wastewater contains high-concentration phosphorus, fluorine ions and a large amount of suspended solids, and the water quality is strongly acidic, which is a typical difficult-to-treat industrial wastewater in the industry. At present, the process route of “neutralization adjustment-flocculation reaction-precipitation separation” is generally used to treat such wastewater in the industry. By adding an alkaline agent to adjust the pH value of the wastewater and then adding a flocculant to promote the formation of flocculation, solid-liquid separation is finally realized in a sedimentation tank, so as to reduce the content of phosphorus, fluorine and suspended solids in the wastewater and preliminarily meet the basic requirements of subsequent treatment or discharge.

[0003] In the aeration flocculation link of the above conventional process, a large amount of floating scum wrapped with flocculation, phosphorus and fluorine pollutants and residual agents is generated in the wastewater aeration process. Such floating scum floats on the surface of the wastewater. The existing process directly disposes the collected floating scum after simple salvage, which not only causes the waste of water and recyclable pollutants therein, but also increases the subsequent solid waste treatment load. SUMMARY

[0004] The application aims to solve the problems in the prior art and provides a water-washed phosphogypsum wastewater purification treatment device and method.

[0005] To achieve the above purpose, the application provides a water-washed phosphogypsum wastewater purification treatment device, which comprises an aeration tank, a collecting assembly for collecting floating scum wastewater is arranged at the upper end of the aeration tank, the collecting assembly comprises a base fixedly installed at the center of the aeration tank, a first transmission shaft is rotatably connected to the upper end of the base, a first belt pulley is fixedly installed at the upper end of the first transmission shaft, a transmission plate is fixedly installed at the lower end of the first transmission shaft close to the first belt pulley, an L-shaped collecting plate is fixedly installed at one side of the lower end of the transmission plate, a separation portion is bent on one side of the L-shaped collecting plate, a guide groove is formed in the transmission plate corresponding to the L-shaped collecting plate, a guide block is slidably connected in the guide groove, a pressing shaft is fixedly connected to the upper end of the guide block, a scraper is fixedly connected to the lower end of the guide block, a protrusion is fixedly connected to one side of the transmission plate corresponding to the scraper, a return spring is fixedly connected to one side of the protrusion, and the other end of the return spring is fixedly connected to the scraper.

[0006] Further, the aeration tank is fixedly installed with a support corresponding to the first transmission shaft, the support is fixedly installed with a motor at the end, the motor output end is movably penetrated through the support, the motor output end is fixedly installed with a second pulley, the motor output end is fixedly installed with a third pulley close to the upper end of the second pulley, and the second pulley and the first pulley are commonly sleeved with a first belt.

[0007] Further, the collecting assembly further comprises a first limiting plate fixedly connected to one side of the upper end of the aeration tank, a concave plate is fixedly connected to the upper end of the first limiting plate and is arranged in a dumping manner, a second limiting plate is fixedly connected to one side of the lower end of the concave plate, a limiting groove is naturally formed between the first limiting plate and the second limiting plate, the limiting groove corresponds to the extrusion shaft, and the aeration tank is provided with a separating assembly for separating floating wastewater on one side of the first limiting plate and the second limiting plate.

[0008] Further, the separating assembly comprises a separating bin fixedly installed on one side of the aeration tank, a filter plate is fixedly installed close to the bottom end of the separating bin, the separating bin is rotatably connected with a second transmission shaft, the second transmission shaft is movably penetrated through the filter plate, a fourth pulley is fixedly installed on the upper end of the second transmission shaft, the fourth pulley and the third pulley are commonly sleeved with a second belt, a conveying and stirring blade is fixedly installed on the second transmission shaft at the middle, a stirring needle is fixedly installed on the second transmission shaft close to the lower end of the conveying and stirring blade, and a conveying plate is fixedly installed on the second transmission shaft close to the lower end of the stirring needle.

[0009] Further, the separating bin is communicated with a floating conveying pipe on one side corresponding to the conveying plate, and the floating conveying pipe is communicated with a floating collection box at the end away from the separating bin.

[0010] Further, the separating bin is communicated with a wastewater conveying pipe on one side corresponding to the lower end of the filter plate, an activated carbon filter layer is fixedly installed in the wastewater conveying pipe, and the wastewater conveying pipe is communicated with a wastewater collection box at the end away from the separating bin.

[0011] Further, a water pump is installed and communicated on one side of the wastewater collection box, a water outlet pipe is communicated with the water outlet end of the water pump, and the water outlet pipe is communicated with the aeration tank at the end away from the water pump.

[0012] Further, the naturally formed limiting groove is in a two-section structure, and the two-section structure comprises a straight section extending obliquely along the aeration tank and an arc section at the end of the straight section.

[0013] Further, the aeration tank lower end is fixedly installed with a support, the aeration tank upper end is fixedly installed with an aeration pipe, one end of the aeration pipe penetrates the aeration tank, and the aeration tank lower end one side is fixedly installed with a blowdown pipe.

[0014] A water washing phosphogypsum wastewater purification treatment method comprises the following steps: S1, water washing phosphogypsum wastewater is introduced into an aeration tank, an aeration system is started, and a composite flocculant is added into the aeration tank, so that a mixed liquid containing flocculi is preliminarily formed; S2, a motor on the support is started, the motor output end drives the second and third pulleys to rotate synchronously, the first belt transmission drives the transmission plate and the L-shaped collecting plate at the lower end to rotate along the aeration tank circumferential direction, and the floating matter on the surface of the aeration tank is scraped to the upper end of the L-shaped collecting plate; S3, when the L-shaped collecting plate rotates with the transmission plate to the limiting groove region between the first and second limiting plates, the extrusion shaft at the upper end of the scraper is gradually extruded, the extrusion shaft then enters the arc segment of the limiting groove, and the extruded extrusion shaft and the scraper guide the floating matter in the separation part of the L-shaped collecting plate into the separation bin on one side of the aeration tank; S4, the third pulley at the motor output end drives the second transmission shaft to rotate through the second belt, and the second transmission shaft drives the conveying stirring blade, stirring needle and conveying plate to rotate; the conveying stirring blade overturns and conveys the floating matter in the separation bin downward, the stirring needle pierces the bubbles in the floating matter, releases the water contained in the bubbles, and the floating matter after bubble breaking and the water mixture are filtered through the filter plate at the bottom end of the separation bin under the action of gravity; the water passes through the filter plate and falls into the lower layer of the separation bin, and the flocculi type floating matter remains above the filter plate; S5, the filtered water in the lower layer of the separation bin is conveyed through the wastewater conveying pipe, when flowing through the activated carbon filter layer in the wastewater conveying pipe, the activated carbon adsorbs the residual phosphorus, fluorine ions and organic matters in the water, the purified wastewater enters the wastewater collection tank for temporary storage, and at the same time, the conveying plate on the second transmission shaft continuously rotates, pushes the concentrated floating matter above the filter plate to the floating matter conveying pipe, and guides the floating matter into the floating matter collection tank for separate storage; S6, the water pump on one side of the wastewater collection tank is started, the purified wastewater is returned to the aeration tank through the water outlet pipe, the water consumption in the aeration tank is supplemented, the water resource is recycled, the sludge deposited at the bottom of the aeration tank is discharged through the blowdown pipe at the lower end of the aeration tank, the sliding smoothness of the extrusion shaft in the limiting groove and the adsorption effect of the activated carbon filter layer are regularly checked, the activated carbon filter layer is replaced when the activated carbon is saturated, and the treatment effect is ensured to be stable.

[0015] Compared with the prior art, the present application has the following beneficial effects: (1) By setting the collection assembly on the upper end of the aeration tank, cooperating with the transmission structure of the motor and the belt pulley, the continuous scraping of the floating foam is realized; at the same time, the two-section limiting groove formed by the first limiting plate and the second limiting plate cooperates with the extrusion shaft to drive the scraper to tilt and complete the directional flow guiding of the floating foam to the separation bin, solving the problems of low floating foam collection efficiency and difficult directional conveying in the existing process, replacing manual operation, reducing labor intensity, ensuring that the floating foam is not retained and overflowed, and providing a basis for subsequent floating foam treatment.

[0016] (2) The conveying stirring blade, stirring needle and conveying plate are driven to rotate by the second transmission shaft, the stirring needle can efficiently pierce the floating foam bubbles to release water, and the filter plate can intercept the flocculation floating foam to realize solid-liquid separation, and the activated carbon filter layer in the wastewater conveying pipe can deeply adsorb and purify the separated water, which can effectively remove residual phosphorus, fluoride ions and organic matter; at the same time, the purified wastewater is sent back to the aeration tank through the water pump and the water outlet pipe, realizing water resource recycling, solving the problems of high floating foam solid waste load and wastewater resource waste in the existing process, ensuring that the effluent water quality is stable and meets the standard, and reducing the consumption of fresh water and operation cost in the aeration process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The first state schematic diagram of the overall structure is provided for the present application; Figure 2 The side view of the overall structure is provided for the present application; Figure 3 The second state schematic diagram of the overall structure is provided for the present application; Figure 4 The motor and the local structure schematic diagram are provided for the present application; Figure 5 The second state local structure schematic diagram of the collection assembly is provided for the present application; Figure 6 The L-shaped collection plate schematic diagram is provided for the present application; Figure 7 The first limiting plate and the second limiting plate structure schematic diagram are provided for the present application; Figure 8 The separation assembly structure schematic diagram is provided for the present application; Figure 9 The separation assembly structure sectional view is provided for the present application.

[0018] In the figure: 1, aeration tank, 2, base, 3, first transmission shaft, 4, first belt pulley, 5, transmission plate, 6, L-shaped collection plate, 7, separation part, 8, guide groove, 9, guide block, 10, extrusion shaft, 11, scraper, 12, protruding block, 13, return spring, 14, support, 15, motor, 16, second belt pulley, 17, third belt pulley, 18, first belt, 19, first limiting plate, 20, concave plate, 21, second limiting plate, 22, limiting groove, 23, separation bin, 24, filter plate, 25, second transmission shaft, 26, fourth belt pulley, 27, second belt, 28, conveying and stirring page, 29, stirring needle, 30, conveying plate, 31, floating scum conveying pipe, 32, floating scum collection box, 33, waste water conveying pipe, 34, activated carbon filter layer, 35, waste water collection box, 36, water pump, 37, water outlet pipe, 38, support, 39, aeration pipe, 40, blowdown pipe. DETAILED DESCRIPTION

[0019] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] As Figures 1-9The water washing phosphogypsum wastewater purification treatment device shown, including aeration tank 1, aeration tank 1 upper end is provided with the collection assembly for collecting floating scum wastewater, the collection assembly includes the base 2 fixedly installed at the center of aeration tank 1, the first transmission shaft 3 is rotatably connected to the upper end of base 2, the first transmission shaft 3 upper end is fixedly installed with the first belt pulley 4, the first transmission shaft 3 is fixedly installed with the transmission plate 5 near the lower end of first belt pulley 4, the transmission plate 5 lower end one side is fixedly installed with L-shaped collection plate 6, the L-shaped collection plate 6 one side is bent with separation part 7, the transmission plate 5 is correspondingly provided with guide groove 8 for L-shaped collection plate 6, the guide groove 8 is slidably connected with guide block 9, the guide block 9 upper end is fixedly connected with extrusion shaft 10, the guide block 9 lower end is fixedly connected with scraper 11, the transmission plate 5 is correspondingly fixedly connected with protruding block 12 one side for scraper 11, the protruding block 12 one side is fixedly connected with return spring 13, the other end of return spring 13 is fixedly connected with scraper 11, the aeration tank 1 is fixedly installed with support 14 corresponding to the first transmission shaft 3, the support 14 terminal end is fixedly installed with motor 15, the motor 15 output end is movably penetrated through the support 14, and the motor 15 output end is fixedly installed with the second belt pulley 16, the motor 15 output end is fixedly installed with the third belt pulley 17 near the upper end of second belt pulley 16, the second belt pulley 16 and the first belt pulley 4 are commonly provided with the first belt 18, the collection assembly further includes the first limiting plate 19 fixedly connected to the upper end of aeration tank 1 one side, the first limiting plate 19 upper end is fixedly connected with the concave plate 20 arranged to pour, the concave plate 20 lower end one side is fixedly connected with the second limiting plate 21, the first limiting plate 19 and the second limiting plate 21 form a limiting groove 22 between, the limiting groove 22 corresponds to extrusion shaft 10, the aeration tank 1 is provided with the separation assembly for separating floating scum wastewater corresponding to the first limiting plate 19, the second limiting plate 21 one side, the naturally formed limiting groove 22 is two-section structure, the two-section structure includes the straight section extending along the aeration tank 1 obliquely and the arc section with the straight section terminal, the aeration tank 1 lower end is fixedly installed with support 38, the aeration tank 1 upper end is fixedly installed with aeration pipe 39, the aeration pipe 39 one end penetrates through aeration tank 1, the aeration tank 1 lower end one side is fixedly installed with blowdown pipe 40; The separation assembly comprises a separation bin 23 fixedly installed on one side of the aeration tank 1, a filter plate 24 fixedly installed close to the bottom end of the separation bin 23, a second transmission shaft 25 rotationally connected to the separation bin 23 and movably penetrating through the filter plate 24, a fourth belt pulley 26 fixedly installed on the upper end of the second transmission shaft 25, a second belt 27 commonly sleeved with the third belt pulley 17 and the fourth belt pulley 26, a conveying and stirring blade 28 fixedly installed at the middle of the second transmission shaft 25, a stirring needle 29 fixedly installed close to the lower end of the conveying and stirring blade 28, a conveying plate 30 fixedly installed close to the lower end of the stirring needle 29, a scum conveying pipe 31 communicated with the separation bin 23 at the side corresponding to the conveying plate 30, a scum collecting tank 32 communicated with the scum conveying pipe 31 away from the separation bin 23, a waste water conveying pipe 33 communicated with the separation bin 23 at the side corresponding to the lower end of the filter plate 24, an activated carbon filter layer 34 fixedly installed in the waste water conveying pipe 33, a waste water collecting tank 35 communicated with the waste water conveying pipe 33 away from the separation bin 23, a water pump 36 installed and communicated with the waste water collecting tank 35, and a water outlet pipe 37 communicated with the water pump 36 away from the water pump 36 and with the aeration tank 1, A water washing phosphogypsum wastewater purification treatment method, comprising the following steps: S1: wastewater is introduced and aerated and flocculated, first, the water washing phosphogypsum wastewater is introduced into the aeration tank 1, then, compressed air is delivered to the aeration pipe 39, the compressed air is uniformly introduced into the aeration tank 1, at this time, the bubbles released by the aeration pipe 39 rise in the wastewater, forming a disturbance environment. At the same time, a composite flocculating agent is continuously added to the aeration tank 1, the agent is fully mixed with the wastewater by the water flow disturbance generated by the aeration pipe 39; during the process, Fe³⁺ and Al³⁺ generated by the ionization of polyaluminum ferric chloride react with phosphorus and fluorine ions in the wastewater to form precipitates, polyacrylamide adsorbs the precipitates to form flocs, the flocs rise with the bubbles and accumulate on the liquid surface of the aeration tank 1, and finally form a honeycomb-shaped scum to complete the pretreatment, laying a foundation for subsequent scum collection.

[0021] S2: Foam collection, after the pretreatment is completed, the motor 15 on the support 14 is started, and the output end of the motor 15 starts to rotate, driving the second pulley 16 and the third pulley 17 on the output end to rotate synchronously. Among them, the second pulley 16 drives the first pulley 4 to rotate through the first belt 18, the first pulley 4 is fixedly connected with the first transmission shaft 3, and then drives the first transmission shaft 3 to rotate around the base 2; the first transmission shaft 3 is fixed at the lower end of the transmission plate 5, the transmission plate 5 rotates synchronously with the first transmission shaft 3, and drives the L-shaped collecting plate 6 at the lower end of the transmission plate 5 to rotate along the circumferential direction of the aeration tank 1; in this process, the reset spring 13 connected between the protruding block 12 and the scraper 11 on the transmission plate 5 is in the initial state, the horizontal section of the L-shaped collecting plate 6 is attached to the liquid surface of the aeration tank 1, and in the rotating process, the separation part 7 scrapes the honeycomb-shaped foam on the liquid surface to the upper end of the L-shaped collecting plate 6. Every rotation, the L-shaped collecting plate 6 can scrape the surface of the aeration tank 1, realize the collection of the foam, replace manual salvage, and reduce the labor intensity.

[0022] S3: Foam flow guide, when the L-shaped collecting plate 6 rotates with the transmission plate 5 to the first limiting plate 19 and the second limiting plate 21 on the upper end of the aeration tank 1, the extrusion shaft 10 on the upper end of the scraper 11 enters the limiting groove 22 between the first limiting plate 19 and the second limiting plate 21 first. First, the extrusion shaft 10 slides along the straight section of the limiting groove 22, and at the same time, the reset spring 13 is stretched, at this time, the guiding effect of the straight section makes the extrusion shaft 10 move horizontally, driving the guide block 9 to slide stably along the guide groove 8 on the transmission plate 5, the sliding guide block 9 drives the scraper 11 to guide the foam temporarily stored on the upper end of the L-shaped collecting plate 6, and the foam flows into the separation bin 23 on one side of the aeration tank 1 along the upper end of the L-shaped collecting plate 6, completing the directional delivery of the foam, and continuing to rotate with the transmission plate 5, the extrusion shaft 10 enters the arc section of the limiting groove 22, and when the extrusion shaft 10 passes through the arc section, the reset spring 13 drives the scraper 11 to reset. The scraper 11 is reset to a horizontal posture, ready for the next round of foam scraping cycle.

[0023] S4: Foam breaking and solid-liquid separation. After the foam is introduced into the separation chamber 23, the third pulley 17 at the output end of the motor 15 drives the fourth pulley 26 above the separation chamber 23 to rotate through the second belt 27. The fourth pulley 26 is fixedly connected with the second transmission shaft 25, thereby driving the second transmission shaft 25 to rotate around the central axis of the separation chamber 23. The conveying and stirring blade 28 fixedly arranged in the middle of the second transmission shaft 25 rotates synchronously with the second transmission shaft 25. The blade of the conveying and stirring blade 28 pushes the foam in the separation chamber 23 to move downward for conveying and stirring, so as to avoid the accumulation of the foam in the separation chamber 23. The stirring needle 29 fixedly arranged at the lower end of the second transmission shaft 25 rotates with the second transmission shaft 25. The sharp end of the stirring needle 29 pierces the small bubbles in the foam, the air in the bubbles is released, the originally fluffy foam collapses, and the wrapped water is released, forming a mixture of foam and water. Under the action of gravity, the mixture penetrates downward, flows through the filter plate 24 near the bottom end of the separation chamber 23, and the water passes through the mesh holes of the filter plate 24 to fall into the lower layer of the separation chamber 23. The foam of the flocculent phosphorus and fluorine-containing precipitate is intercepted by the filter plate 24 and remains above the filter plate 24, realizing the solid-liquid separation of the foam and laying a foundation for subsequent water purification and foam collection.

[0024] S5: wastewater purification and foam collection. The filtered water in the lower layer of the separation chamber 23 flows into the wastewater conveying pipe 33 under the action of gravity. The activated carbon filter layer 34 fixedly arranged in the wastewater conveying pipe 33 purifies the filtered water. When the filtered water flows along the wastewater conveying pipe 33, it fully contacts with the activated carbon filter layer 34. The porous structure of the activated carbon filter layer 34 adsorbs the residual phosphorus, fluorine ions and trace organic matter in the water. The purified water after adsorption continues to flow along the wastewater conveying pipe 33 and finally enters the wastewater collection tank 35 for temporary storage, completing the deep purification of the wastewater. At the same time, the conveying plate 30 fixedly arranged at the lower end of the stirring needle 29 rotates with the second transmission shaft 25. The spiral blade of the conveying plate 30 pushes the concentrated foam intercepted above the filter plate 24 to move to the foam conveying pipe 31 on one side of the separation chamber 23. The concentrated foam flows into the foam collection tank 32 through the pipeline of the foam conveying pipe 31 for separate storage.

[0025] S6: wastewater reuse. After the purified water temporarily stored in the wastewater collection tank 35 reaches a certain liquid level, the water pump 36 on one side of the wastewater collection tank 35 is started. The inlet of the water pump 36 is communicated with the wastewater collection tank 35, and the outlet is connected with the water outlet pipe 37. The suction generated by the operation of the water pump 36 extracts the purified water in the wastewater collection tank 35, which is conveyed to the aeration tank 1 through the water outlet pipe 37 to supplement the water consumption in the aeration process of the aeration tank 1, reduce the amount of fresh water, and reduce the operating cost.

[0026] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A device for purifying wastewater from washing phosphogypsum, comprising an aeration tank (1), characterized in that, The aeration tank (1) is provided with a collecting assembly for collecting floating wastewater at the upper end, the collecting assembly comprises a base (2) fixedly installed at the center of the aeration tank (1), a first transmission shaft (3) is rotatably connected to the upper end of the base (2), a first belt pulley (4) is fixedly installed on the upper end of the first transmission shaft (3), a transmission plate (5) is fixedly installed on the lower end of the first transmission shaft (3) close to the first belt pulley (4), an L-shaped collecting plate (6) is fixedly installed on one side of the lower end of the transmission plate (5), a separation part (7) is bent on one side of the L-shaped collecting plate (6), a guide groove (8) is formed in the transmission plate (5) corresponding to the L-shaped collecting plate (6), a guide block (9) is slidably connected in the guide groove (8), an extrusion shaft (10) is fixedly connected to the upper end of the guide block (9), a scraper (11) is fixedly connected to the lower end of the guide block (9), a protrusion (12) is fixedly connected to one side of the transmission plate (5) corresponding to the scraper (11), a return spring (13) is fixedly connected to one side of the protrusion (12), and the other end of the return spring (13) is fixedly connected to the scraper (11).

2. A device for purifying wastewater from washing phosphogypsum according to claim 1, characterized in that The aeration tank (1) is provided with a collecting assembly for collecting floating wastewater at the upper end, the collecting assembly comprises a base (2) fixedly installed at the center of the aeration tank (1), a first transmission shaft (3) is rotatably connected to the upper end of the base (2), a first belt pulley (4) is fixedly installed on the upper end of the first transmission shaft (3), a transmission plate (5) is fixedly installed on the lower end of the first transmission shaft (3) close to the first belt pulley (4), an L-shaped collecting plate (6) is fixedly installed on one side of the lower end of the transmission plate (5), a separation part (7) is bent on one side of the L-shaped collecting plate (6), a guide groove (8) is formed in the transmission plate (5) corresponding to the L-shaped collecting plate (6), a guide block (9) is slidably connected in the guide groove (8), an extrusion shaft (10) is fixedly connected to the upper end of the guide block (9), a scraper (11) is fixedly connected to the lower end of the guide block (9), a protrusion (12) is fixedly connected to one side of the transmission plate (5) corresponding to the scraper (11), a return spring (13) is fixedly connected to one side of the protrusion (12), and the other end of the return spring (13) is fixedly connected to the scraper (11).

3. The device for purifying wastewater of selenite gypsum according to claim 1, characterized in that, The collecting assembly further comprises a first limiting plate (19) fixedly connected to one side of the upper end of the aeration tank (1), a concave plate (20) is fixedly connected to the upper end of the first limiting plate (19) in a pouring manner, a second limiting plate (21) is fixedly connected to one side of the lower end of the concave plate (20), a limiting groove (22) is naturally formed between the first limiting plate (19) and the second limiting plate (21), the limiting groove (22) corresponds to the extrusion shaft (10), and the aeration tank (1) is provided with a separation assembly for separating floating wastewater on one side of the first limiting plate (19) and the second limiting plate (21).

4. The device for purifying wastewater of phosphogypsum according to claim 3, characterized in that, The separation assembly comprises a separation bin (23) fixedly installed on one side of the aeration tank (1), a filter plate (24) is fixedly installed on the separation bin (23) close to the bottom end, a second transmission shaft (25) is rotatably connected to the separation bin (23), and the second transmission shaft (25) movably penetrates through the filter plate (24), a fourth belt pulley (26) is fixedly installed on the upper end of the second transmission shaft (25), the fourth belt pulley (26) and the third belt pulley (17) are commonly sleeved with a second belt (27), a conveying and stirring blade (28) is fixedly installed on the second transmission shaft (25), a stirring needle (29) is fixedly installed on the second transmission shaft (25) close to the lower end of the conveying and stirring blade (28), and a conveying plate (30) is fixedly installed on the second transmission shaft (25) close to the lower end of the stirring needle (29).

5. A device for purifying wastewater from washing phosphogypsum according to claim 4, characterized in that The separation bin (23) is communicated with a scum conveying pipe (31) on the side corresponding to the conveying plate (30), and the scum conveying pipe (31) is communicated with a scum collecting tank (32) at the end away from the separation bin (23).

6. A device for purifying wastewater from washing of fibrous gypsum according to claim 5, characterized in that The separation bin (23) is communicated with a wastewater conveying pipe (33) on the side corresponding to the lower end of the filter plate (24), the wastewater conveying pipe (33) is fixedly installed with an activated carbon filter layer (34) inside, and the wastewater conveying pipe (33) is communicated with a wastewater collecting tank (35) at the end away from the separation bin (23).

7. The device for purifying wastewater of phosphogypsum according to claim 6, characterized in that A water pump (36) is installed and communicated on one side of the wastewater collecting tank (35), the water pump (36) is communicated with a water outlet pipe (37) at the water outlet end, and the water outlet pipe (37) is communicated with the aeration tank (1) at the end away from the water pump (36).

8. The device for purifying wastewater of ardealite according to claim 3, characterized in that, The limiting groove (22) is formed naturally and has a two-section structure, including a straight section extending obliquely along the aeration tank (1) and an arc section at the end of the straight section.

9. The device for purifying wastewater of phosphogypsum according to claim 1, characterized in that, The aeration tank (1) is fixedly installed with a support (38) at the lower end, fixedly installed with an aeration pipe (39) at the upper end, and the aeration pipe (39) penetrates the aeration tank (1) at one end, and the aeration tank (1) is fixedly installed with a blowdown pipe (40) on one side at the lower end.

10. A method for purifying wastewater of washed phosphogypsum, for a purifying device of wastewater of washed phosphogypsum according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1, the water washing phosphogypsum wastewater is introduced into the aeration tank (1), the aeration system is started, and a composite flocculant is added into the aeration tank (1), and a mixed liquid containing flocculation bodies is formed; S2, the motor (15) on the support (14) is started, the motor (15) drives the second pulley (16) and the third pulley (17) to rotate synchronously, the first belt (18) is driven to rotate, and then the transmission plate (5) and the L-shaped collecting plate (6) at the lower end are driven to rotate along the circumferential direction of the aeration tank (1), the scum on the surface of the aeration tank (1) is scraped to the upper end of the L-shaped collecting plate (6); S3, when the L-shaped collecting plate (6) rotates with the transmission plate (5) to the limiting groove (22) region between the first limiting plate (19) and the second limiting plate (21), the extrusion shaft (10) at the upper end of the scraper (11) is gradually extruded, the extrusion shaft (10) then enters the arc section of the limiting groove (22), and the extrusion shaft (10) and the scraper (11) guide the scum in the separation part (7) of the L-shaped collecting plate (6) to the separation bin (23) on one side of the aeration tank (1); S4, the third pulley (17) at the output end of the motor (15) drives the second transmission shaft (25) to rotate through the second belt (27), the second transmission shaft (25) drives the conveying stirring blade (28), the stirring needle (29) and the conveying plate (30) to rotate, the conveying stirring blade (28) overturns and conveys the scum in the separation bin (23) downward, the stirring needle (29) pierces the bubbles in the scum to release the water in the bubbles, and the scum and the water mixture after the bubbles are broken are filtered through the filter plate (24) at the bottom end of the separation bin (23) under the action of gravity, the water passes through the filter plate (24) and falls into the lower layer of the separation bin (23), and the flocculation body type scum remains above the filter plate (24); S5, the filter water of the lower layer of the separation bin (23) is transported through the waste water conveying pipe (33), when flowing through the activated carbon filter layer (34) in the waste water conveying pipe (33), the activated carbon adsorbs the residual phosphorus, fluorine ions and organic matters in the water, and the purified waste water enters the waste water collecting box (35) for temporary storage, at the same time, the conveying plate (30) on the second transmission shaft (25) continuously rotates, pushes the concentrated floating scum above the filter plate (24) to the floating scum conveying pipe (31), and introduces the floating scum into the floating scum collecting box (32) for separate storage; S6, the water pump (36) on one side of the waste water collecting box (35) is started, the purified waste water is returned to the aeration tank (1) through the water outlet pipe (37), the water consumption in the aeration tank (1) is supplemented, the water resource recycling is realized, the sludge deposited at the bottom of the aeration tank (1) is discharged through the sewage pipe (40) at the lower end of the aeration tank (1); the sliding smoothness of the extrusion shaft (10) in the limiting groove (22) and the adsorption effect of the activated carbon filter layer (34) are regularly checked, when the activated carbon is saturated, the activated carbon filter layer (34) is replaced, and the treatment effect is stable.

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