A water-washed phosphogypsum wastewater purification treatment system

Abstract

The present invention belongs to the technical field of wastewater adsorption and purification, and specifically is a water-washed phosphogypsum wastewater purification treatment system, comprising a pretreatment module, an adsorption and purification module and a detection module, wherein the pretreatment module performs preliminary filtering treatment on the wastewater, the adsorption and purification module performs adsorption and purification treatment on the pretreated wastewater, and the detection module detects the treated wastewater to determine whether the treated wastewater meets the discharge standard; the present invention forms a large water pressure at the bottom of the liquid inlet pipe position due to the wastewater liquid level difference, and the water flow formed by instant conduction impacts the purification cavity inside the purification layer, so that the adsorbed impurities and the adsorbed materials with a tendency to adhere to each other and form a mass are dissociated and dispersed by the violent impact of the purification water flow, so that the purification layer with poor circulation is effectively self-cleaned, the smooth flow of wastewater is ensured, the frequency of manual cleaning is reduced, and the purification efficiency of the water-washed phosphogypsum wastewater is improved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater adsorption and purification technology, specifically a wastewater purification and treatment system for water-washed phosphogypsum. Background Art

[0002] Phosphogypsum generally refers to a byproduct obtained from the production of phosphoric acid by decomposing phosphate rock with sulfuric acid. Depending on the production process, phosphogypsum can be divided into dihydrate gypsum and hemihydrate gypsum. Currently, the utilization rate of phosphogypsum is low, and most of it is still disposed of through stockpiling, resulting in a year-on-year increase in stockpiled phosphogypsum. Besides occupying a large amount of land resources, this also poses significant environmental risks, especially when seepage prevention at phosphogypsum stockpiles fails, potentially causing environmental pollution through leakage of water-soluble phosphorus and fluorine compounds from the gypsum.

[0003] The purification of phosphogypsum mainly involves warm water washing. The phosphogypsum is placed in a slurry tank for rinsing, then further washed in a filter, and finally mechanically dehydrated under vacuum. All techniques utilizing phosphogypsum include water washing separation and neutralization of free acids. Soluble contaminants in phosphogypsum are readily soluble in water, and these contaminants remain suspended on the surface during washing. Washing removes most of these impurities. The wastewater after washing must be treated before discharge or reuse. Physical treatment methods mainly include filtration, sedimentation, and adsorption. Chemical agents are used to cause the contaminants to precipitate and settle, facilitating separation. After separation, filtration devices can be used for purification, such as mixed-type filters, where the adsorption of filter media removes contaminants from the wastewater.

[0004] In current use, the filter adsorption material accumulated inside the filter bed has uneven contact with the flowing wastewater. Due to gravity, the adsorbed impurities flow down and settle through the gaps in the filter adsorption material, resulting in the accumulation of impurities and pollutants at the bottom. Thus, the uneven distribution of separated impurities and pollutants affects the permeability of wastewater in the middle of the filter bed, requiring frequent manual cleaning of the filter bed and affecting the wastewater purification efficiency. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a wastewater purification and treatment system for water-washed phosphogypsum.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention proposes a wastewater purification and treatment system for washing phosphogypsum, including a pretreatment module, an adsorption purification module and a detection module. The pretreatment module performs preliminary filtration treatment on the wastewater, the adsorption purification module performs adsorption purification treatment on the pretreated wastewater, and the detection module detects the treated wastewater to determine whether the treated wastewater meets the discharge standards.

[0007] The adsorption and purification module includes a purification channel, and multiple purification layers are uniformly arranged inside the purification channel. The purification layers are used to adsorb and purify the flowing wastewater. The purification layer includes a purification box and an adsorbent material filled in the purification chamber inside the purification box.

[0008] The purification box is slidably connected to the inner wall of the purification channel on both sides. An inlet pipe is provided at the bottom of the front of the purification box, and the inlet pipe communicates with the inside of the purification chamber. An outlet is provided on the back of the purification box, and the outlet is located on the back of the purification box near the top. Slider blocks are provided on both sides of the purification box, and the sliders are slidably embedded in the grooves provided on the inner wall of the purification channel.

[0009] Preferably, the inlet pipe is slidably connected to the side wall of the purification chamber, and a limit cylinder is provided on the inner wall of the purification chamber at the position corresponding to the end of the inlet pipe;

[0010] The end of the inlet pipe located inside the purification chamber is slidably embedded into the limiting cylinder, and the end of the inlet pipe is connected to the inner wall of the limiting cylinder by an elastic element; the side wall of the inlet pipe is uniformly provided with dispersion holes, and the dispersion holes connect the inside of the purification chamber and the inside of the inlet pipe.

[0011] Preferably, a control rod is provided at the middle position of the liquid inlet pipe, one end of the control rod extends to the inlet of the liquid inlet pipe and is provided with a sealing plate to seal the inlet of the liquid inlet pipe; the other end of the control rod passes laterally through the middle position of the inner wall of the limiting cylinder and is connected to the telescopic device provided in the inner wall of the limiting cylinder.

[0012] Preferably, the surface of the control rod is uniformly provided with combing rods, the connection between the combing rods and the control rod is made of elastic material, and the end of the combing rod slides through the dispersion hole provided on the side wall of the liquid inlet pipe.

[0013] Preferably, a dispersing bar is provided at the end of the combing bar, the dispersing bar is distributed in a ring around the combing bar, and bristles are provided on the side wall of the dispersing bar.

[0014] Preferably, the control rod is a tubular structure, and the interior of the control rod communicates with the interior of the limiting cylinder through a filling hole; a connecting hole is provided on the outer surface of the side wall of the limiting cylinder, the connecting hole communicates with the interior of the limiting cylinder, and a filter screen is provided at the opening of the connecting hole; a piston plate is provided on the end of the control rod that is embedded in the interior of the limiting cylinder, and the piston plate is slidably connected to the inner wall of the limiting cylinder;

[0015] Both the combing rod and the dispersing rod are tubular structures, and the control rod, combing rod, and dispersing rod are all interconnected. The dispersing rod is uniformly provided with impact holes, which are connected to the hollow part inside the dispersing rod.

[0016] Preferably, the area inside the purification chamber between the liquid inlet pipe and the liquid outlet is uniformly provided with partitions, the partitions are vertically arranged, and the gap area between the partitions forms a flow guiding channel.

[0017] Preferably, a crushing plate is provided on the inner wall of the flow guiding channel. The crushing plate is bent and the crushing plates on both sides of the flow guiding channel are staggered.

[0018] Preferably, the flow channel includes an upper flow channel and a lower flow channel, which are interleaved. The inlet pipe is located at the bottom of the upper flow channel, and the end of the crushing plate in the upper flow channel is bent downward, as is the end of the crushing plate in the lower flow channel.

[0019] Preferably, the telescopic device is provided with a rotating device on its telescopic end, and the output end of the rotating device is connected to the control rod.

[0020] The beneficial effects of this invention are as follows:

[0021] The present invention discloses a wastewater purification system for phosphogypsum washing. To ensure the permeability of wastewater through the purification layer, the inlet pipe is closed for areas of the purification layer where permeability is affected. This causes wastewater to continuously accumulate in the front area of ​​the purification layer, initiating water storage. Meanwhile, in the rear area of ​​the purification layer, the wastewater level drops due to the cut-off of the wastewater source, resulting in a significant wastewater level difference between the two sides of the purification layer. When the wastewater in the front area of ​​the purification layer accumulates to exceed the height of the outlet, the inlet pipe is opened. Due to the wastewater level difference, a large water pressure is generated at the bottom of the inlet pipe, instantly creating a water flow that impacts the purification chamber inside the purification layer. The water hammer effect causes the adsorbed material in the bottom area of ​​the purification chamber to be violently impacted. The adsorbed material flows upward due to the impact, causing the adsorbed material in different areas of the vertical direction inside the purification chamber to exchange.

[0022] The adsorbent material, which tends to clump together due to adsorption of impurities, is dissociated and dispersed by the violent impact of the purified water flow. Impurities accumulated in the gaps between the adsorbent material are also dispersed evenly due to the impact. In this way, the poorly flowing purification layer is effectively self-cleaned, and areas that may be compacted and blocked are self-organized, restoring the smooth flow of wastewater. After continuous operation for a period of time, multiple purification layers can be self-cleaned in sequence, avoiding the problem of impurities accumulating at the bottom of the purification chamber due to gravity, which could lead to poor wastewater flow or even blockage. This ensures the smooth flow of wastewater, reduces the frequency of manual cleaning, and improves the purification efficiency of phosphogypsum wastewater. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a perspective view of the present invention;

[0025] Figure 2 This is a perspective view of the purification box in this invention;

[0026] Figure 3 This is a diagram of the internal structure of the purification chamber in this invention;

[0027] Figure 4 This is a sectional view of the purification box from the side in this invention;

[0028] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0029] Figure 6 yes Figure 4 A magnified view of a section at point B.

[0030] In the diagram: purification channel 1, purification chamber 11, slider 12, chute 13, purification layer 2, purification box 21, limiting cylinder 211, connecting hole 212, liquid inlet pipe 22, dispersion hole 221, liquid outlet 23, control rod 24, sealing plate 241, telescopic device 242, combing rod 243, dispersion rod 244, impact hole 245, rotating device 246, filling hole 247, piston plate 248, partition 25, guide channel 26, crushing plate 261, upper channel 262, lower channel 263. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] To effectively solve the above problems, see the attached diagram in the instruction manual. Figures 1-6 As shown, a wastewater purification system for washing phosphogypsum includes a pretreatment module, an adsorption purification module, and a detection module. The pretreatment module performs preliminary filtration on the wastewater and adds chemical agents to the wastewater to accelerate the precipitation of flocculated impurities. The adsorption purification module performs adsorption purification on the pretreated wastewater. The detection module detects the treated wastewater to determine whether the treated wastewater meets the discharge standards.

[0034] The adsorption and purification module includes a purification channel 1, and multiple purification layers 2 are uniformly arranged inside the purification channel 1. The purification layers 2 are used to adsorb and purify the flowing wastewater. The purification layer 2 includes a purification box 21 and an adsorption material filled in the purification chamber 11 inside the purification box 21. The adsorption material here can be a filter material with sewage purification and adsorption function, such as activated carbon particles.

[0035] The purification box 21 is slidably connected to the inner wall of the purification channel 1 on both sides. An inlet pipe 22 is provided at the bottom of the front of the purification box 21, and the inlet pipe 22 communicates with the inside of the purification chamber 11. An outlet 23 is provided on the back of the purification box 21, and the outlet 23 is located on the back of the purification box 21 near the top. Slider blocks 12 are provided on both sides of the purification box 21. The sliders 12 are slidably embedded in the sliding grooves 13 provided on the inner wall of the purification channel 1. The cooperation between the sliders 12 and the sliding grooves 13 realizes the limiting and fixing of the purification box 21. After working continuously for a long time, the purification box 21 can be slidably pulled out during the purification interval to clean and replace the adsorbed material inside, ensuring the smooth progress of the wastewater purification process.

[0036] Specific workflow: In order to better purify the wastewater from washing phosphogypsum, the purification system of this application is introduced. First, the large particulate impurities and suspended impurities in the wastewater are separated by a pretreatment module, which can be an existing wastewater coarse filtration device. Then, purification agents, such as flocculants and acid-base adjustment reagents, are mixed in to adjust the pH of the wastewater and accelerate the flocculation and sedimentation of impurities. Finally, the wastewater that has been pre-purified by the pretreatment module enters the adsorption purification module for further purification.

[0037] Specifically, wastewater is introduced into the purification channel 1 and flows slowly along it. Multiple purification layers 2 are sequentially arranged within the purification channel 1. As the waste gas passes through each purification layer 2, it first contacts the purification chamber 21 within that layer, flowing in through the inlet pipe 22 on the front of the purification chamber 21 and contacting the adsorbent material inside the purification chamber 11. The wastewater then flows upwards along the gaps between the adsorbent materials. During this process, pollutants in the wastewater are adsorbed onto the surface of the adsorbent materials, resulting in the purification treatment of the wastewater and the separation of fine pollutants. The wastewater continues to flow along the purification channel 1 after exiting from the outlet 23 near the top, contacting the next purification layer 2 and undergoing repeated purification treatment. Finally, after being tested by the detection module and meeting the purification standards, the wastewater flows to the next process.

[0038] Furthermore, to ensure the passage of wastewater through the purification layer 2, the opening and closing of the inlet pipe 22 is controlled by an external controller. A flow detection sensor is installed at the outlet 23. When the flow rate at the outlet 23 of the purification layer 2 slows down and is significantly lower than the normal range, it indicates that the adsorbent material inside the purification layer 2 has adsorbed too many pollutants, and the accumulated impurities are unevenly distributed in the gaps between the adsorbent material, affecting the passage of wastewater through the adsorbent material. For the purification layer 2 whose passage is affected, the inlet pipe 22 is closed, so that the wastewater in the front area of ​​the purification layer 2 continues to concentrate and begins to store water. In the rear area of ​​the purification layer 2, because the wastewater source is cut off, the wastewater level drops, thus forming a large wastewater level difference between the two sides of the purification layer 2.

[0039] When the wastewater in the front area of ​​the purification layer 2 accumulates to a height exceeding that of the outlet 23, the inlet pipe 22 is opened. Due to the difference in wastewater level, a large water pressure is formed at the bottom of the inlet pipe 22. The instantaneous flow of water impacts the purification chamber 11 inside the purification layer 2. The water hammer effect causes the adsorbed material in the bottom area of ​​the purification chamber 11 to be violently impacted. The adsorbed material flows upward due to the impact, causing the adsorbed material in different areas of the vertical direction inside the purification chamber 11 to exchange. The adsorbed material, which tends to stick together and clump together due to the adsorption of impurities, is broken down by the violent impact of the purification water flow. The impurities accumulated in the gaps between the adsorbed materials are also dispersed evenly due to the impact, thus effectively cleaning the poorly flowing purification layer 2. Areas that may be compacted and blocked are cleaned up, restoring the smooth flow of wastewater. After continuous operation for a period of time, multiple purification layers 2 can be self-cleaned in sequence, avoiding the problem of impurities accumulating at the bottom of the purification chamber 11 due to gravity, which could lead to poor wastewater flow or even blockage. This ensures the smooth flow of wastewater, reduces the frequency of manual cleaning, and improves the purification efficiency of water-washed phosphogypsum wastewater.

[0040] Example 2:

[0041] Based on Embodiment 1, the liquid inlet pipe 22 is slidably connected to the side wall of the purification box 21, and a limit cylinder 211 is provided at the part corresponding to the end of the liquid inlet pipe 22 on the inner wall of the purification box 21.

[0042] The end of the inlet pipe 22 located inside the purification chamber 21 is slidably embedded into the limiting cylinder 211, and the end of the inlet pipe 22 is connected to the inner wall of the limiting cylinder 211 by an elastic element, which can be a spring; the side wall of the inlet pipe 22 is evenly provided with dispersion holes 221, which connect the inside of the purification chamber 21 and the inside of the inlet pipe 22; a control rod 24 is provided in the middle of the inlet pipe 22, one end of the control rod 24 extends to the inlet of the inlet pipe 22 and is provided with a sealing plate 241 to seal the inlet of the inlet pipe 22, and the other end of the control rod 24 passes through the middle of the inner wall of the limiting cylinder 211 and is connected to the telescopic device 242 provided in the inner wall of the limiting cylinder 211. The telescopic device 242 can be an existing electric telescopic device.

[0043] Specific workflow: Based on the specific workflow in Embodiment 1, this embodiment provides a possible technical solution for controlling the opening and closing of the inlet pipe 22. When the inlet pipe 22 needs to be kept closed, the telescopic device 242 is shortened, causing the control rod 24 to drive the sealing plate 241 to approach the opening of the inlet pipe 22 and squeeze and seal the opening of the inlet pipe 22. At this time, the elastic element between the inlet pipe 22 and the limiting cylinder 211 remains in a compressed state, and the end of the inlet pipe 22 is in close contact with the sealing plate 241. When the inlet pipe 22 needs to be opened, the telescopic device 242 is extended, and the control rod 24 drives the sealing plate 241 away from the inlet pipe 22, so that the opening of the inlet pipe 22 comes into contact with the wastewater. The compression limit is released, so the external wastewater can flow into the inlet pipe 22 more quickly and flow out from the dispersion holes 221 uniformly arranged on the side wall of the inlet pipe 22, and flow into the adsorption material gap inside the purification chamber 11 evenly.

[0044] During use, the telescopic device 242 can be activated and moved back and forth multiple times, causing the inlet pipe 22 to open and close multiple times. This, combined with the water pressure caused by the difference in liquid level on both sides of the purification layer 2, forms an intermittent, violent impact water flow that impacts vertically upward from the bottom of the purification chamber 11, promoting uniform mixing of the adsorbed material inside the purification chamber 11 and fully dispersing the adsorbed material that tends to clump together, ensuring smooth flow of wastewater.

[0045] During this process, due to the impact of external wastewater and the elastic connection between the inlet pipe 22 and the limiting cylinder 211, the inlet pipe 22 slides back and forth along the limiting cylinder 211 under the impact of the wastewater, causing the intensity of the outflowing wastewater to change drastically. The repeated impact of the water flow causes the adsorbent material inside the purification chamber 11 near the inlet pipe 22 to be agitated by the impact of the flowing wastewater, accelerating the mutual exchange and flow of the purification material at different positions inside the purification chamber 11, making the adsorbed impurities and pollutants evenly distributed, and avoiding the problem of blockage of the inlet pipe 22 due to local concentration. The repeated flow of the inlet pipe 22 causes mutual friction between the flowing wastewater, the adsorbent material and the inlet pipe 22, which also prevents the adsorbent material and pollutants from adhering to the surface of the inlet pipe 22, ensuring smooth flow of the dispersion holes 221 on the inlet pipe 22, so that the purification of wastewater can proceed smoothly.

[0046] Example 3:

[0047] Based on Embodiment 2, combing rods 243 are uniformly arranged on the surface of the control rod 24. The connection between the combing rod 243 and the control rod 24 is made of elastic material, which facilitates the relative swinging of the combing rod 243 relative to the control rod 24. The end of the combing rod 243 slides through the dispersion hole 221 provided on the side wall of the liquid inlet pipe 22.

[0048] A dispersing bar 244 is provided at the end of the combing bar 243. The dispersing bar 244 is arranged in a ring around the combing bar 243, and bristles are provided on the side wall of the dispersing bar 244.

[0049] Specific workflow: Based on the specific workflow in Example 2, the combing rod 243 on the control rod 24 passes through the dispersion hole 221 and is slidably connected to the dispersion hole 221; when the external wastewater impact causes the inlet pipe 22 to slide back and forth along the limiting cylinder 211, the control rod 24 slides relative to the inlet pipe 22. During this process, the combing rod 243 swings back and forth relative to the control rod 24 under the action of the reciprocating dispersion hole 221; the swinging combing rod 243 plays a combing role on the dispersion hole 221 on the inlet pipe 22, which can effectively clean the impurities and contaminants adhering to the dispersion hole 221 and the inner wall of the inlet pipe 22, ensuring smooth flow in the inlet pipe 22 and the dispersion hole 221;

[0050] Furthermore, after the end of the combing rod 243 extends out of the dispersion hole 221, it is embedded in the gap of the adsorbed material at the bottom of the purification chamber 11. The end of the dispersion rod 244, which is diverging from the end of the combing rod 243, contacts the adsorbed material. As the combing rod 243 swings, it drives the dispersion rod 244 and the bristles on the dispersion rod 244 to swing and rub against the adsorbed material, accelerating the flow of the adsorbed material at the bottom of the purification chamber 11. The impact of the dispersion rod 244 and the comb also causes the part of the adsorbed material that tends to agglomerate to be broken and refined under the impact of the dispersion rod 244. Thus, the part of the bottom of the purification chamber 11 that tends to be compacted and agglomerated due to gravity is dispersed under the impact, making the adsorbed material at the bottom looser, which facilitates the flow of wastewater from bottom to top, promotes full contact between the adsorbed material and the wastewater and makes it usable, and further enhances the adsorption and purification effect.

[0051] Example 4:

[0052] Based on Embodiment 3, the control rod 24 has a tubular structure, and the internal area of ​​the control rod 24 communicates with the interior of the limiting cylinder 211 through a filling hole 247, which is located at the end of the control rod 24 embedded in the limiting cylinder 211. A connecting hole 212 is provided on the outer surface of the side wall of the limiting cylinder 211, which communicates with the interior of the limiting cylinder 211, and a filter screen is provided at the opening of the connecting hole 212. A piston plate 248 is provided on the end of the control rod 24 embedded in the limiting cylinder 211, and the piston plate 248 is slidably connected to the inner wall of the limiting cylinder 211. The part of the outer ring of the piston plate 248 that slides in contact with the inner wall of the limiting cylinder 211 is made of rubber elastic material.

[0053] Both the combing rod 243 and the dispersing rod 244 are tubular structures, and the control rod 24, the combing rod 243 and the dispersing rod 244 are all connected. The dispersing rod 244 is uniformly provided with impact holes 245, which are connected to the hollow part inside the dispersing rod 244.

[0054] Specific workflow: Based on the specific workflow in Example 3, the connecting hole 212 is set as a tapered hole, and the end of the connecting hole 212 near the inside of the limiting cylinder 211 is the small end; as the control rod 24 moves back and forth, the piston plate 248 on the control rod 24 moves outward, causing the internal area of ​​the limiting cylinder 211 to draw wastewater from the external purification chamber 11 due to negative pressure. The wastewater flows into the limiting cylinder 211 through the large end of the connecting hole 212, filling the interior of the limiting cylinder 211 due to the piston plate 248. The area cleared by the retraction; then, when the control rod 24 drives the piston plate 248 to reset, it squeezes the wastewater inside the limiting cylinder 211. Because the wastewater is difficult to flow out in time through the small end of the connecting hole 212, the large water pressure formed by the squeezing of the wastewater inside the limiting cylinder 211 causes the wastewater to flow into the hollow area inside the control rod 24 through the filling hole 247 at an accelerated speed. Then, it flows outward along the connecting combing rod 243 and dispersing rod 244, and finally flows outward from the impact hole 245 on the dispersing rod 244.

[0055] On the one hand, the impact hole 245 is located in the gap area of ​​the bristles on the dispersing rod 244. Therefore, the wastewater flowing out of the impact hole 245 concentrates the water flow to impact the adsorbed material part that is in contact with the dispersing rod 244. This allows the dispersing rod 244 to contact and agitate the adsorbed material, and the water flow sprayed out of the impact hole 245 can further penetrate and agitate the adsorbed material, further impacting and dispersing the adsorbed material agglomerates. In addition, the wastewater flowing out through the gaps in the bristles can also rinse and clean the bristles, thereby ensuring the cleanliness of the dispersing rod 244 and the bristles themselves.

[0056] On the other hand, as wastewater accelerates through the interior of the combing rod 243 and the dispersing rod 244, the friction of the wastewater flow causes the combing rod 243 and the dispersing rod 244 to vibrate more rapidly due to the wastewater flow. This causes the adsorbed materials and pollutants adhering to the surface to fall off, thereby better ensuring the normal operation of the combing rod 243 and the dispersing rod 244. The vibration of the combing rod 243 can also more effectively clean the impurities adhering to the inner wall of the corresponding dispersing hole 221, thereby ensuring the unobstructed flow of the dispersing hole 221 and thus ensuring the normal passage of wastewater.

[0057] Example 5:

[0058] Based on Embodiment 4, partitions 25 are evenly arranged in the area between the inlet pipe 22 and the outlet 23 inside the purification box 21. The partitions 25 are vertically arranged, and the gap area between the partitions 25 forms a flow channel 26. A crushing plate 261 is arranged on the inner wall of the flow channel 26. The crushing plate 261 is bent, and the crushing plates 261 on both sides of the flow channel 26 are staggered.

[0059] The flow channel 26 includes an upper flow channel 262 and a lower flow channel 263, which are intersected. The inlet pipe 22 is located at the bottom of the upper flow channel 262, and the end of the crushing plate 261 in the upper flow channel 262 is bent downward, as is the end of the crushing plate 261 in the lower flow channel 263.

[0060] Specific workflow: Based on the specific workflow in Example 4, in order to promote the mixing and uniform distribution of adsorbent materials in different areas inside the purification chamber 11, and to avoid the problem of local concentration of pollutants and impurities affecting the flow of wastewater and the normal operation of purification treatment, the uniformly vertically arranged partitions 25 divide the interior of the purification chamber 11 into multiple vertically extending guide channels 26, in which the liquid inlet pipe 22 is located at the bottom of the upper flow channel 262; thus, due to the water pressure formed by the liquid level difference, the external wastewater is accelerated to flow into the liquid inlet pipe 22, and then flows from bottom to top, passing through the upper flow channel 262 and flowing out from the liquid outlet 23 at the top;

[0061] During this process, the upward-flowing wastewater carries the adsorbed material at the bottom of the upward channel 262 upward along the upward channel 262 and contacts the crushing plate 261 corresponding to the partition 25. This allows the upward-flowing adsorbed material to pass through the gaps in the crushing plate 261. When the adsorbed material agglomerates through the gaps in the crushing plate 261, it is broken and dispersed by the impact of the crushing plate 261, making the upward-flowing adsorbed material more refined and uniform. When the adsorbed material flows with the wastewater to the top area of ​​the purification chamber 11, the wastewater flows out through the outlet 23, while the adsorbed material concentrates at the top of the purification chamber 11. Subsequently, when it moves laterally to the upper area of ​​the downward channel 263, the impact of the upward flow of wastewater is concentrated in the upward channel 262. Therefore, when the adsorbed material moves to the upper area of ​​the downward channel 263, the upward impact is weakened, and it flows downward under the action of gravity. During the downward flow, it is again subjected to the crushing impact of the crushing plate 261 on the inner wall of the downward channel 263, making the adsorbed material further refined.

[0062] In this way, as the wastewater flows upward, the adsorbent material is carried up from the upper channel 262 and then down from the lower channel 263. This vertical circulation ensures that the adsorbent material at different positions in the vertical direction inside the purification chamber 11 is fully exchanged and flows, avoiding the problem of pollutants and impurities concentrating in the bottom area due to gravity, which affects the flowability of wastewater.

[0063] Example 6:

[0064] Based on Embodiment 5, a rotating device 246 is provided on the telescopic end of the telescopic device 242. The output end of the rotating device 246 is connected to the control rod 24. Here, the rotating device 246 can be a rotating motor device.

[0065] Specific workflow: Based on the specific workflow in Example 5, the device 246 is rotated for a period of time. After the device 246 is started, it can drive the control rod 24 and the combing rod 243 to rotate, and at the same time drive the interlocking liquid inlet pipe 22 to rotate. The combing rod 243, which is set to disperse, covers the area below the partition 25. This causes the adsorbed material at the bottom of the purification chamber 11, located in the area below the partition 25, to be affected by the rotating combing rod 243 and the dispersing rod 244. This strengthens the agitation and dispersion of the adsorbed material, while also promoting the lateral flow of the adsorbed material in the area below the partition 25. This improves the horizontal flow exchange efficiency of the adsorbed material in the bottom area, making the adsorbed material more evenly mixed and distributed.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for purifying water-washed phosphogypsum wastewater, comprising a pretreatment module, an adsorption purification module and a detection module, wherein the pretreatment module performs preliminary filtering treatment on the wastewater, the adsorption purification module performs adsorption purification treatment on the pretreated wastewater, and the detection module detects the treated wastewater to determine whether the treated wastewater meets the discharge standard; It is characterized in that The adsorption purification module comprises a purification channel (1), a plurality of purification layers (2) are evenly arranged inside the purification channel (1), and the purification layers (2) are used to perform adsorption purification treatment on flowing wastewater; the purification layers (2) comprise a purification box (21), and an adsorption material filled in a purification cavity (11) inside the purification box (21); The two sides of the purification box (21) are slidably connected to the inner wall of the purification channel (1); a liquid inlet pipe (22) is provided at the bottom of the front of the purification box (21), and the liquid inlet pipe (22) is communicated with the interior of the purification chamber (11); a liquid outlet (23) is provided at the back of the purification box (21), and the liquid outlet (23) is located at a position close to the top of the back of the purification box (21); sliders (12) are provided on both sides of the purification box (21), and the sliders (12) are slidably embedded in the slide grooves (13) provided on the inner wall of the purification channel (1); The liquid inlet pipe (22) is slidably connected to the side wall of the purification box (21), and a limiting cylinder (211) is provided at a position of the inner wall of the purification box (21) corresponding to the end of the liquid inlet pipe (22); The end of the liquid inlet pipe (22) located inside the purification box (21) is slidably embedded in the limiting cylinder (211), and the end of the liquid inlet pipe (22) is connected to the inner wall of the limiting cylinder (211) via an elastic member; the side wall of the liquid inlet pipe (22) is evenly provided with dispersion holes (221), and the dispersion holes (221) communicate with the interior of the purification chamber (11) and the interior of the liquid inlet pipe (22); A control rod (24) is provided in the middle of the liquid inlet pipe (22); one end of the control rod (24) extends to the inlet of the liquid inlet pipe (22), and a closing plate (241) is provided to close the inlet of the liquid inlet pipe (22); the other end of the control rod (24) transversely penetrates the middle of the inner wall of the limiting cylinder (211), and is connected to a telescopic device (242) provided in the inner wall of the limiting cylinder (211); For the purification layer (2) whose permeability is affected, the liquid inlet pipe (22) is closed to form a wastewater liquid level difference in the areas on both sides of the purification layer (2); When the wastewater in the front area of ​​the purification layer (2) accumulates to a height exceeding the liquid outlet (23), the liquid inlet pipe (22) is opened, so that the purification layer (2) with poor circulation can be effectively self-cleaned.

2. A method for purifying wastewater from washed phosphogypsum according to claim 1, characterized in that: Combing rods (243) are evenly arranged on the surface of the control rod (24), the connecting portion between the combing rod (243) and the control rod (24) is made of elastic material, and the end of the combing rod (243) slides through the dispersion holes (221) arranged on the side wall of the liquid inlet pipe (22).

3. A method for purifying wastewater from washed phosphogypsum according to claim 2, characterized in that: A dispersion rod (244) is arranged at the end of the combing rod (243), the dispersion rod (244) is distributed in a ring shape around the combing rod (243), and bristles are arranged on the side walls of the dispersion rod (244).

4. A method for purifying wastewater from washed phosphogypsum according to claim 3, characterized in that: The control rod (24) is a tubular structure, and the interior of the control rod (24) is communicated with the interior of the limiting cylinder (211) through a liquid filling hole (247); a connecting hole (212) is provided on the outer surface of the side wall of the limiting cylinder (211), the connecting hole (212) is communicated with the interior of the limiting cylinder (211), and a filter is provided at the opening of the connecting hole (212); a piston plate (248) is provided on the end of the control rod (24) embedded in the interior of the limiting cylinder (211), and the piston plate (248) is slidably connected to the inner wall of the limiting cylinder (211); The combing rod (243) and the dispersion rod (244) are both tubular structures, and the control rod (24), the combing rod (243) and the dispersion rod (244) are all connected to each other. Impact holes (245) are evenly arranged on the dispersion rod (244), and the impact holes (245) are connected to the hollow part inside the dispersion rod (244).

5. A method for purifying wastewater from washed phosphogypsum according to claim 1, characterized in that: Partitions (25) are evenly arranged in the area between the liquid inlet pipe (22) and the liquid outlet (23) inside the purification box (21); the partitions (25) are arranged vertically, and the gap areas between the partitions (25) form guide channels (26).

6. A method for purifying wastewater from washed phosphogypsum according to claim 5, characterized in that: A crushing plate (261) is arranged on the inner wall of the guide channel (26); the crushing plate (261) is arranged in a curved manner, and the crushing plates (261) on both sides of the guide channel (26) are staggered with each other.

7. A method for purifying wastewater from washed phosphogypsum according to claim 6, characterized in that: The guide channel (26) comprises an upstream channel (262) and a downstream channel (263), the upstream channel (262) and the downstream channel (263) are interlaced with each other, and the liquid inlet pipe (22) is located at the bottom of the upstream channel (262), and the end of the crushing plate (261) in the upstream channel (262) is bent downward, and the end of the crushing plate (261) in the downstream channel (263) is bent downward.

8. A method for purifying wastewater from washed phosphogypsum according to claim 1, characterized in that: A rotating device (246) is provided on the telescopic end of the telescopic device (242), and the output end of the rotating device (246) is connected to the control rod (24).

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