Wet-process phosphoric acid concentrated wastewater recovery device and process thereof

Abstract

The invention discloses a wet-process phosphoric acid concentrated wastewater recovery device and process, and relates to the technical field of phosphoric acid manufacturing, the wet-process phosphoric acid concentrated wastewater recovery device comprises a shell, a settling tank, a pressurizing assembly, a heating assembly and an energy conversion assembly, the settling tank is arranged in the shell, the settling tank comprises a tank body and a reverse osmosis membrane, and the settling tank is matched with the heating assembly; a precipitation method and a membrane separation method can be used for wastewater at the same time to reduce harmful substances in the wastewater to the maximum extent, the heating assembly can improve the filtering effect of the precipitation tank on the harmful substances in the wastewater, and the energy conversion assembly can convert pressure energy brought by the pressurization assembly into heat energy needed by the heating assembly. And on the whole, no extra energy is consumed, and the energy consumption of the equipment is reduced, so that the equipment has the effects of improving the wastewater purification effect and reducing the energy consumption.

Description

Technical Field

[0001] The present application relates to the technical field of phosphoric acid manufacturing, and in particular to a wet-process phosphoric acid concentrated wastewater recovery device and a process thereof. Background Art

[0002] Wet-process phosphoric acid refers to phosphoric acid produced by decomposing phosphate rock with inorganic acids such as sulfuric acid, nitric acid or hydrochloric acid. A large amount of wastewater will be generated in the manufacturing process of wet-process phosphoric acid, and the wastewater will also contain some phosphoric acid. Directly discharging the wastewater into the environment will not only damage the environment, but also cause a waste of phosphoric acid resources. Therefore, the wastewater needs to be pre-treated to meet the emission standards.

[0003] A Chinese patent with publication number: CN115947434B discloses a crystallization reactor for treating iron phosphate wastewater, which describes a method for treating wastewater by adding a precipitant to the wastewater, the precipitant reacts chemically with the phosphoric acid in the wastewater to form water-insoluble salt substances, and then uses a membrane separation method to further remove the salts. In order to protect the subsequent membrane treatment system, coagulants and flocculants such as PAC and PAM cannot be added during the chemical precipitation process, resulting in a very small particle size of the precipitate formed in the chemical precipitation, which is difficult to aggregate and has a poor precipitation effect. The content of fine particles in the effluent is high, and it is easy to continue to crystallize and grow on the pipe wall of the subsequent equipment, resulting in blockage of the pipe and equipment, causing serious impact on production.

[0004] In response to the above-mentioned technical problems, the method adopted by the above-mentioned patent is to accelerate the formation of crystals in the crystallization zone by setting up the first crystallization zone and the second crystallization zone, as well as the auxiliary effect of the reagent, and at the same time, a diversion swing net is also provided. The diversion swing net can not only promote the downward movement of water in the reaction crystallization zone and play a role in strengthening the water flow, but also, since the crystals in the crystallization zone are in the growth period, the diversion swing net can intercept part of the crystals, thereby effectively precipitating and intercepting the particles that cannot be precipitated in the wastewater as a whole, thereby avoiding the occurrence of blockage of subsequent equipment pipelines.

[0005] However, the structure of the above-mentioned reactor is too complicated, which greatly increases the volume of the wastewater treatment device, not only increasing the difficulty of device maintenance, but also increasing the maintenance and operation costs of the equipment. Summary of the invention

[0006] The purpose of the present application is to provide a wet-process phosphoric acid concentrated wastewater recovery device and process thereof, which can not only avoid the situation where particles block subsequent pipelines as much as possible, but also greatly simplify the structure of the wastewater treatment device, thereby reducing the maintenance difficulty and maintenance cost of the equipment.

[0007] In the first aspect, the present application provides a wet-process phosphoric acid concentrated wastewater recovery device that adopts the following technical solution: The outer shell has a liquid inlet at the upper end and a drain outlet at the lower end; A sedimentation tank is installed on the inner wall of the shell, the sedimentation tank is connected with a liquid inlet pipe, the liquid inlet pipe is connected with the liquid inlet, the sedimentation tank comprises a tank body and a reverse osmosis membrane, the tank body is provided with a drainage groove, and the reverse osmosis membrane is installed at the drainage groove; The pressurizing assembly is used to reduce the space inside the sedimentation tank to increase the pressure inside the sedimentation tank, so that the purified water in the tank body is sprayed out from the drainage groove.

[0008] Optionally, a heating component is provided on the tank body, and the heating component can heat the liquid in the sedimentation tank to enhance the chemical reaction effect and the removal effect of harmful substances in the sedimentation tank. At the same time, the heating component can also heat the reverse osmosis membrane so that the reverse osmosis membrane is at a suitable temperature, thereby improving the filtering effect of the reverse osmosis membrane.

[0009] Optionally, an energy conversion component is provided on the inner wall of the shell, and the energy conversion component is used to convert the kinetic energy of the water sprayed from the drainage groove into thermal energy on the heating component to reduce the consumption of additional energy.

[0010] Optionally, the energy conversion component includes a magnetic field generator and an impeller, the magnetic field generator is mounted on the inner wall of the outer shell, the impeller is coaxially fixedly connected to the coil in the magnetic field generator, the water sprayed from the drainage trough acts on the impeller, and the output end of the magnetic field generator is electrically connected to the heating component through a wire.

[0011] Optionally, a plurality of drainage grooves are provided, and the plurality of drainage grooves are evenly spaced around the tank body. A plurality of energy conversion components are provided, and impellers in the plurality of energy components are arranged around the axis of the tank body, and the plurality of impellers correspond one-to-one to the plurality of drainage grooves.

[0012] Optionally, the pressurizing assembly includes a slide plate, a side wall of the slide plate is in sliding contact with an inner wall of the sedimentation tank, and a driving member for driving the slide plate to move in a vertical direction is provided on the inner wall of the outer shell.

[0013] Optionally, a drain pipe and a return pipe are provided at the drain outlet, one end of the return pipe away from the drain outlet is connected to the liquid inlet pipe, and a pump is provided on the return pipe.

[0014] Optionally, a detection component is provided at the bottom of the shell, and the detection component is used to detect harmful substances in the water at the bottom of the shell. The detection component is electrically connected to the pump. When the detection component detects that the quality of the discharged water does not meet the standards, the discharged water will be pumped into the sedimentation tank for re-purification.

[0015] In a second aspect, the present application provides a wet-process phosphoric acid concentrated wastewater recovery process, based on the above-mentioned wet-process phosphoric acid concentrated wastewater recovery device, comprising the following steps: S1: Pour the waste liquid into the sedimentation tank from the liquid inlet, and pour the precipitant into the sedimentation tank from the liquid inlet, and wait for the phosphate substances in the sedimentation tank to react to form insoluble salts; S2: The driving member is started to drive the slide plate downward, the pressure in the tank increases, part of the liquid in the tank is filtered through the reverse osmosis membrane, and is ejected from the drain tank, driving the impeller to rotate, and then the magnetic field generator supplies power to the heating component, and the heating component heats the liquid in the tank and the reverse osmosis membrane to improve the chemical reaction effect in the waste liquid and the filtering effect of the reverse osmosis membrane; S3: When the slide plate moves down to the bottom of the tank, the slide plate squeezes and filters the sediment to reduce the water content of the sediment, which is convenient for subsequent work; S4: The detection component detects the water at the bottom of the shell. If the detection meets the standard, the drain pipe is opened for discharge. If the detection does not meet the standard, the pump is started to pump the water at the bottom of the shell into the tank for re-purification.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the precipitant is added to the waste liquid in the sedimentation tank, the precipitant and the phosphoric acid in the waste liquid produce chemical reactions to generate water-insoluble salt substances, and then the slide moves down, the space in the tank body decreases, and the pressure increases. Therefore, the water in the tank body passes through the reverse osmosis membrane and is discharged from the drain tank. The salt substances and solid debris in the tank body cannot pass through the reverse osmosis membrane, and they move downward under the action of the slide until the slide moves to the bottom of the tank body. In the process of purifying the waste liquid, the salt substances and solid impurities generated by this equipment are always in the tank body, so it cannot be used to purify the pipelines of subsequent equipment. At the same time, this equipment combines the traditional precipitation device and the membrane separation device. The overall volume of the equipment is relatively small, the floor space is small, the use cost is low, and it is relatively easy to maintain. In addition, the slide plate in this equipment can not only concentrate all the salt substances and solid impurities at the bottom of the tank body, but also when the slide plate moves to the bottom of the tank body, it can squeeze the salt substances and solid impurities, thereby squeezing out the moisture of the salt substances and solid impurities. The moisture of the salt substances and solid impurities is reduced, which is convenient for subsequent workers to dry and remove water from the salt substances and solid impurities. 2. The heating component can heat the waste liquid in the tank body, and the temperature in the waste liquid increases, so that the degree of chemical reaction between the precipitant and the phosphoric acid in the waste liquid is more intense, so that the reaction between the precipitant and the phosphoric acid is more thorough, further improving the removal effect of the precipitant on phosphoric acid in the waste water, thereby improving the purification effect of the equipment on the waste liquid; at the same time, since the working effect of the reverse osmosis membrane is relatively poor at low temperatures, and the heating component in the present application can also heat the reverse osmosis membrane, therefore, the heating component not only improves the removal effect of the precipitant on phosphoric acid in the waste liquid, but also improves the filtering effect of the reverse osmosis membrane on phosphoric acid in the waste liquid, thereby further improving the purification effect of the equipment as a whole; 3. When the slide plate moves downward, the space in the tank body decreases and the pressure increases. The water in the tank body will be ejected from the drain groove under pressure. The water has a certain kinetic energy when ejected, and after the water is ejected from the drain groove, the water will move downward due to the action of gravity. Therefore, the gravitational potential energy of the water will also be converted into the kinetic energy of the water, that is, the pressure energy in the tank body and the gravitational potential energy of the water are both converted into the kinetic energy of the water. After the water with kinetic energy hits the impeller, it will impact the impeller and drive the impeller to rotate. The rotation of the impeller will drive the magnetic field generator to generate electricity, and the generated electric energy will be transferred to the heating component so that the heating component can heat the waste liquid and the reverse osmosis membrane. In summary, the heat energy of the waste liquid and the reverse osmosis membrane in the present application comes from the pressure energy in the tank body and the gravitational potential energy of the water, and it does not consume additional energy consumption, thereby reducing the energy consumption of the equipment as a whole and achieving the effect of energy saving; 4. The setting of the reflux pipe, pump and detection components can enable the purified water that does not meet the standards to be purified again, thereby further improving the purification effect of the equipment on waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a cross-sectional view of the overall structure of Example 1 of the present application; Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a schematic diagram of the structure of the sedimentation tank in Example 1 of the present application; Figure 5 is a schematic diagram of the structure of the energy conversion component in Example 1 of the present application; Figure 6 is a schematic structural diagram of a conductive slip ring in Example 1 of the present application; In the figure, 1. outer shell; 11. liquid inlet; 12. liquid inlet pipe; 13. drain outlet; 14. crossbeam; 2. sedimentation tank; 21. tank body; 211. drain trough; 22. reverse osmosis membrane; 3. pressurizing component; 31. slide plate; 32. driving part; 4. heating component; 5. energy conversion component; 51. impeller; 52. magnetic field generator; 521. mounting tube; 522. magnetic block; 523. connecting rod; 524. coil; 525. conductive slip ring; 6. return pipe; 61. pump; 7. detection component. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-6 , further details of this application are given. Example 1

[0019] A wet process phosphoric acid concentrated wastewater recovery device, referring to Figure 1 and Figure 2 , including a shell 1, a sedimentation tank 2 and a pressurizing component 3.

[0020] The outer shell 1 in this embodiment is set to be cylindrical, with a liquid inlet 11 at the upper end of the outer shell 1 and a drain outlet 13 at the lower end of the outer shell 1. Electric valves (not shown in the figure) are provided at the liquid inlet 11 and the drain outlet 13. The electric valves are connected to the control center. A cross beam 14 is provided on the inner wall of the outer shell 1, and the sedimentation tank 2 is fixedly installed on the cross beam 14, and the sedimentation tank 2 is coaxially arranged with the outer shell 1.

[0021] The sedimentation tank 2 in this embodiment includes a tank body 21 and a reverse osmosis membrane 22. The bottom of the tank body 21 is fixedly mounted on the cross beam 14. A plurality of drainage grooves 211 are provided on the side wall of the tank body 21. In this embodiment, six drainage grooves 211 are arranged evenly spaced around the axis of the tank body 21. The drainage grooves 211 in this embodiment extend to the bottom of the tank body 21. Six reverse osmosis membranes 22 are also provided in this embodiment. The six reverse osmosis membranes 22 correspond one-to-one to the six drainage grooves 211. The reverse osmosis membrane 22 is fixedly mounted on the groove wall of the drainage groove 211. A liquid inlet pipe 12 is connected to the side wall of the tank body 21. The end of the liquid inlet pipe 12 away from the tank body 21 is connected to the liquid inlet 11.

[0022] The pressurizing assembly 3 is installed on the inner wall of the outer shell 1 . The pressurizing assembly 3 in this embodiment can adjust the size of the space inside the tank body 21 .

[0023] When it is necessary to purify the waste water, the waste liquid is poured into the tank body 21 from the liquid inlet 11. The density of the waste liquid in the tank body 21 is higher than the density of the gas outside the tank body 21. Therefore, the pressure inside the tank body 21 will be greater than the pressure outside the tank body 21. The characteristic of the reverse osmosis membrane 22 is to allow the liquid in the low-pressure space to flow into the high-pressure space. Therefore, the waste liquid in the tank body 21 will not pass through the reverse osmosis membrane 22 and flow out from the drain trough 211; after adding a certain amount of waste liquid, a precipitant without a coagulant and a flocculant is added to the tank body 21 through the liquid inlet 11. The precipitant reacts chemically with the phosphoric acid in the waste liquid to generate water-insoluble salt substances. These salt substances and solid debris in the waste liquid cannot pass through the reverse osmosis membrane 22, and the reverse osmosis membrane 22 in this embodiment also has certain chemical properties, and the phosphoric acid in the waste liquid cannot pass through the reverse osmosis membrane 22.

[0024] After the precipitant reacts with the phosphoric acid in the waste liquid for a period of time, the pressurizing component 3 is started. The pressurizing component 3 reduces the space in the tank body 21, so the pressure in the tank body 21 continues to increase. When the pressure in the tank body 21 exceeds the pressure that the reverse osmosis membrane 22 can withstand, the water in the tank body 21 will pass through the reverse osmosis membrane 22 and spray out from the drain trough 211, and finally fall on the bottom of the shell. In this embodiment, after the phosphoric acid in the waste liquid in the tank body 21 is precipitated by the precipitant, most of the phosphoric acid will be converted into solid salt substances. Even if there is a small amount of phosphoric acid that has not reacted, due to the properties of the reverse osmosis membrane 22, the phosphoric acid in the waste liquid cannot pass through the reverse osmosis membrane 22. Therefore, in general, after the double filtration and purification of the precipitant and the reverse osmosis membrane 22, the water sprayed from the drain trough 211 is basically purified, thereby improving the overall evolution effect of the device on the waste liquid.

[0025] At the same time, during the process of purifying the waste liquid by the equipment in this embodiment, the salt substances and solid impurities generated are always in the tank body 21, so they cannot block the pipelines of subsequent equipment. At the same time, the equipment combines the traditional sedimentation device and the membrane separation device. The overall volume of the equipment is relatively small, the footprint is small, the use cost is low, and it is relatively easy to maintain.

[0026] The pressurizing component 3 includes a slide plate 31 and a driving member 32. The slide plate 31 in this embodiment is slidably installed in the tank body 21, and the side wall of the slide plate 31 is slidably abutted against the inner wall of the tank body 21. The driving member 32 in this embodiment is configured as a telescopic rod, which is installed on the inner wall of the shell, and the output end of the telescopic rod is fixedly connected to the slide plate 31.

[0027] When it is necessary to reduce the internal space of the tank body 21, the telescopic rod is started to drive the slide plate 31 to move downward. When the slide plate 31 continues to move downward until it reaches the bottom of the tank body 21, it can squeeze the salt substances and solid impurities, thereby squeezing out the moisture of the salt substances and solid impurities. The moisture of the salt substances and solid impurities is reduced, which makes it convenient for subsequent workers to dry and remove water from the salt substances and solid impurities.

[0028] Reference Figure 2 and Figure 3 In this embodiment, a heating component 4 is provided on the tank body 21, and the heating component 4 can heat the waste liquid in the tank body 21. The temperature in the waste liquid increases, so that the precipitant reacts chemically with the phosphoric acid in the waste liquid more strongly, so that the precipitant and the phosphoric acid react more thoroughly, further improving the removal effect of the precipitant on phosphoric acid in the waste water, and further improving the purification effect of the equipment on the waste liquid; at the same time, since the working effect of the reverse osmosis membrane 22 is relatively poor at low temperatures, and the heating component 4 in the present application can also heat the reverse osmosis membrane 22, therefore, the heating component 4 not only improves the removal effect of the precipitant on phosphoric acid in the waste liquid, but also improves the filtering effect of the reverse osmosis membrane 22 on phosphoric acid in the waste liquid, thereby further improving the purification effect of the equipment as a whole.

[0029] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , an energy conversion component 5 (combined with Figure 4), the energy conversion components in this embodiment are provided with six groups, and the six groups of energy components correspond to the six drainage grooves 211 one by one. The energy components in this embodiment include an impeller 51 and a magnetic field generator 52. The impeller 51 is rotatably mounted on the beam 14, and the magnetic field generator 52 is fixedly mounted on the beam 14. The impeller 51 is directly opposite to the drainage groove 211 on the tank body 21. It should be noted that the heating component 4 in this embodiment is configured as a resistor block, and a plurality of resistor blocks are provided, and are respectively arranged on the bottom of the tank body 21 and the side wall of the tank body 21. The magnetic field power generation in this embodiment includes a mounting cylinder 521, two oppositely arranged opposite magnetic blocks 522 and a magnetic field generator 522 located between the two magnetic blocks 522. The coil 524 is between the two magnetic blocks 522, and the mounting cylinder 521 is fixed on the mounting beam 14. Two oppositely arranged magnetic blocks 522 are fixedly mounted on the inner circumferential wall of the mounting cylinder 521. The coil 524 is located between the two magnetic blocks 522. A connecting rod 523 is coaxially fixedly connected to the impeller 51. One end of the connecting rod 523 away from the impeller 51 is inserted into the mounting cylinder 521 and fixedly connected to the coil 524. Two conductive slip rings 525 are fixedly arranged on the inner circumferential wall of the mounting cylinder 521. The two conductive slip rings 525 correspond to both ends of the coil 524 one by one. One end of the coil 524 slides and abuts against the inner circumferential wall of the conductive slip ring 525, and the conductive slip ring 525 is electrically connected to the resistance block through a wire.

[0030] When the telescopic rod is started to drive the slide plate 31 to move downward, the space in the tank body 21 is reduced and the pressure is increased. The water in the tank body 21 will be ejected from the drain groove 211 under pressure. The water has a certain kinetic energy when ejected, and after the water is ejected from the drain groove 211, the water will move downward due to the action of gravity. Therefore, the gravitational potential energy of the water will also be converted into the kinetic energy of the water, that is, the pressure energy in the tank body 21 and the gravitational potential energy of the water are both converted into the kinetic energy of the water. After the water with kinetic energy hits the impeller 51, it will impact the impeller 51 and drive the impeller 51 to rotate. The rotation of the impeller 51 will drive the coil 524 to rotate. The rotation of the coil 524 will cut the two opposite magnetic blocks. 522, the coil 524 will generate current when cutting the magnetic field, and then the current on the coil 524 will flow to the resistor block through the conductive slip ring 525 and the wire. The resistor block starts to heat up after being energized, and the heat energy emitted by the resistor block is transferred to the waste liquid and the reverse osmosis membrane 22, thereby improving the removal effect of the precipitant on phosphoric acid in the waste liquid and improving the filtering effect of the reverse osmosis membrane 22 on phosphoric acid in the waste liquid; at the same time, the heat energy of the waste liquid and the reverse osmosis membrane 22 in the present application comes from the pressure energy in the tank body 21 and the gravitational potential energy of the water, and no additional energy consumption is consumed, thereby reducing the energy consumption of the equipment as a whole and achieving energy-saving effects.

[0031] It should be noted that the energy conversion component and the heating component 4 are not started until the precipitant converts most of the phosphoric acid in the waste liquid into salt substances. The reason is that after most of the phosphoric acid in the waste liquid is converted into salt substances, there may still be a small part of the phosphoric acid that has not undergone chemical reaction. At this time, the waste liquid is heated by the heating component 4, the temperature of the waste liquid increases, and the molecular movement activity in the waste liquid is enhanced, thereby increasing the probability of a small part of the phosphoric acid molecules and the precipitant molecules to undergo chemical reaction, thereby improving the precipitant's removal effect on the phosphoric acid molecules.

[0032] Reference Figure 1 and Figure 2 In this embodiment, a drain pipe and a return pipe 6 (both are provided with electric valves) are provided at the drain outlet 13, a pump 61 is provided on the return pipe 6, and one end of the return pipe 6 away from the drain outlet 13 is connected to the liquid inlet pipe 12, and a detection component 7 is provided at the bottom of the shell. The detection component 7 in this embodiment can be set as a phosphoric acid detector or a detector of other components, or a plurality of detectors for detecting different components. In this embodiment, a phosphoric acid detector is preferably used. The phosphoric acid detector, the pump 61 and the telescopic rod in this embodiment are all electrically connected to the control center.

[0033] The water sprayed from the drain trough 211 falls on the bottom of the shell, and the phosphoric acid detector can detect the water at the bottom of the shell. When the phosphoric acid detector detects that the phosphoric acid content in the water exceeds the standard, the control center closes the electric valve on the drain pipe, opens the electric valve and pump 61 on the return pipe 6, and the pump 61 draws the water at the bottom of the shell back into the tank body 21 to re-precipitate and filter the substandard water, thereby improving the overall filtering and purification effect of the equipment on wastewater. Example 2

[0034] A wet-process phosphoric acid concentrated wastewater recovery process, based on the above-mentioned wet-process phosphoric acid concentrated wastewater recovery device, comprises the following steps: S1: Pour the waste liquid into the precipitation tank 2 from the liquid inlet 11, and pour the precipitant into the precipitation tank 2 from the liquid inlet 11, and wait for the phosphoric acid substance in the precipitation tank 2 to react to form a water-insoluble salt substance; S2: The driving member 32 is started to drive the slide plate 31 to move downward, the pressure in the tank body 21 increases, part of the liquid in the tank body 21 is filtered through the reverse osmosis membrane 22, and is ejected from the drain groove 211, and drives the impeller 51 to rotate, and then the magnetic field generator 52 supplies power to the heating component 4, and the heating component 4 heats the liquid in the tank body 21 and the reverse osmosis membrane 22 to improve the chemical reaction effect in the waste liquid and improve the filtering effect of the reverse osmosis membrane 22; S3: When the slide plate 31 moves down to the bottom of the tank 21, the slide plate 31 squeezes and filters the sediment to reduce the water content of the sediment, which is convenient for subsequent work; S4: the detection component 7 detects the water at the bottom of the shell. If the detection meets the standard, the drain pipe is opened for discharge. If the detection does not meet the standard, the pump 61 is started to pump the water at the bottom of the shell into the tank body 21 for re-purification.

[0035] This process can greatly improve the equipment's purification effect on wastewater, thereby being able to recover useful substances in the wastewater to the maximum extent, thereby improving the equipment's recovery rate of phosphoric acid in the wastewater and reducing the impact of wastewater on the environment.

[0036] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wet-process phosphoric acid concentrated wastewater recovery device, characterized in that: include: The housing (1) is provided with a liquid inlet (11) at the upper end and a water outlet (13) at the lower end; A sedimentation tank (2) is mounted on the inner wall of the housing (1); the sedimentation tank (2) is connected to a liquid inlet pipe (12); the liquid inlet pipe (12) is connected to the liquid inlet port (11); the sedimentation tank (2) comprises a tank body (21) and a reverse osmosis membrane (22); a drainage groove (211) is provided on the tank body (21); and the reverse osmosis membrane (22) is mounted at the drainage groove (211); The pressurizing component (3) is used to reduce the space inside the sedimentation tank (2) to increase the pressure inside the sedimentation tank (2), thereby causing the purified water in the tank body (21) to be ejected from the drainage groove (211).

2. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 1, characterized in that: The tank body (21) is provided with a heating component (4), and the heating component (4) is capable of heating the liquid in the sedimentation tank (2) to enhance the chemical reaction effect and the removal effect of harmful substances in the sedimentation tank (2). At the same time, the heating component (4) is also capable of heating the reverse osmosis membrane (22) to keep the reverse osmosis membrane (22) at a suitable temperature, thereby improving the filtering effect of the reverse osmosis membrane (22).

3. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 2, characterized in that: An energy conversion component (5) is provided on the inner wall of the housing (1), and the energy conversion component (5) is used to convert the kinetic energy of water sprayed from the drainage groove (211) into thermal energy on the heating component (4), so as to reduce the consumption of additional energy.

4. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 3, characterized in that: The energy conversion component (5) comprises a magnetic field generator (52) and an impeller (51); the magnetic field generator (52) is mounted on the inner wall of the housing (1); the impeller (51) is coaxially fixedly connected to a coil (524) in the magnetic field generator (52); water sprayed from the drainage trough (211) acts on the impeller (51); and the output end of the magnetic field generator (52) is electrically connected to the heating component (4) via a wire.

5. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 4, characterized in that: A plurality of the drainage grooves (211) are provided, and the plurality of the drainage grooves (211) are evenly spaced around the tank body (21); a plurality of groups of the energy conversion components (5) are provided, and the impellers (51) in the plurality of groups of the energy components surround the axis of the tank body (21), and the plurality of the impellers (51) correspond one-to-one to the plurality of the drainage grooves (211).

6. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 1, characterized in that: The pressurizing component (3) comprises a slide plate (31), the side wall of the slide plate (31) being in sliding contact with the inner wall of the sedimentation tank (2), and a driving member (32) for driving the slide plate (31) to move in a vertical direction is provided on the inner wall of the housing (1).

7. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 1, characterized in that: A drainage pipe and a return pipe (6) are provided at the drainage port (13); one end of the return pipe (6) away from the drainage port (13) is in communication with the liquid inlet pipe (12); and a pump (61) is provided on the return pipe (6).

8. A wet-process phosphoric acid concentrated wastewater recovery device according to claim 7, characterized in that: A detection component (7) is provided at the bottom of the shell, and the detection component (7) is used to detect harmful substances in the water at the bottom of the shell. The detection component (7) is electrically connected to the pump (61). When the detection component (7) detects that the quality of the discharged water does not meet the standard, the discharged water will be pumped into the sedimentation tank (2) by the pump (61) for re-purification.

9. A wet-process phosphoric acid concentrated wastewater recovery process, based on the wet-process phosphoric acid concentrated wastewater recovery device in claims 1-8, comprising the following steps: S1: Pour the waste liquid into the sedimentation tank (2) from the liquid inlet (11), and pour the precipitant into the sedimentation tank (2) from the liquid inlet (11), and wait for the phosphoric acid substance in the sedimentation tank (2) to react to form insoluble salts; S2: The driving member (32) is started to drive the slide plate (31) to move downward, the pressure in the tank body (21) increases, part of the liquid in the tank body (21) is filtered through the reverse osmosis membrane (22) and ejected from the drainage groove (211), and the impeller (51) is driven to rotate, and then the magnetic field generator (52) supplies power to the heating component (4), and the heating component (4) heats the liquid in the tank body (21) and the reverse osmosis membrane (22), so as to improve the chemical reaction effect in the waste liquid and improve the filtering effect of the reverse osmosis membrane (22); S3: When the slide plate (31) moves down to the bottom of the tank body (21), the slide plate (31) squeezes and filters the sediment to reduce the water content of the sediment, thereby facilitating subsequent work; S4: The detection component (7) detects the water at the bottom of the shell. If the detection meets the standard, the drain pipe is opened for discharge. If the detection does not meet the standard, the pump (61) is started to pump the water at the bottom of the shell into the tank (21) for re-purification.

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