A treatment system for rare earth wastewater

Abstract

The present invention discloses a treatment system for rare earth wastewater, including a distillation kettle and a collection tank, and a condenser tube is connected between the distillation kettle and the collection tank. A discharge pipe and an outlet pipe are installed on the distillation kettle. A plurality of electric heating wires are installed on the inner side wall of the distillation kettle. An air blower is installed on the distillation kettle through a rotating shaft, and the rotating shaft is driven by a first motor. A reflux pipe is also connected between the distillation kettle and the collection tank. A lifting cylinder penetrating up and down is installed in the distillation kettle, and a turbine is connected to the rotating shaft. The present invention can reduce the evaporation loss of the condensate, and can form a liquid film on the inner surface of the distillation kettle by using the lifting cylinder and the fan plate, fully utilize the inner surface area of the distillation kettle, and improve the evaporation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth wastewater treatment, and specifically provides a treatment system for rare earth wastewater. Background Art

[0002] A large amount of acidic wastewater is generated during the spray purification of the tail gas from the roasting of rare earth concentrates. The content of fluorine in this type of wastewater is relatively high. If it cannot be effectively treated, it will cause serious pollution to the environment. In the current vacuum distillation process, the hydrofluoric acid extracted is prone to evaporate again, which will not only result in a loss of recovery volume, but also easily cause damage to the vacuum pump. In addition, in the existing vacuum distillation, the evaporation surface is only the liquid surface, with a small area, slow evaporation speed, and prone to bumping phenomenon. To solve the above problems, the present invention provides a treatment system for rare earth wastewater. Summary of the Invention

[0003] The purpose of the present invention is to provide a treatment system for rare earth wastewater to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A treatment system for rare earth wastewater includes a distillation kettle and a collection tank, and a condenser tube is connected between the distillation kettle and the collection tank. After the steam in the distillation kettle condenses into a liquid in the condenser tube, the condensed liquid will flow into the collection tank. An inlet pipe for discharging acidic wastewater and an outlet pipe for discharging distillation residue are installed on the distillation kettle. Electric valves are installed in both the inlet pipe and the outlet pipe, and the opening and closing of the electric valves can be remotely controlled. A plurality of electric heating wires are installed on the inner side wall of the distillation kettle. The distillation kettle is equipped with a rotating shaft through a fixed frame fixedly connected inside it. The fixed frame is fixedly connected inside the distillation kettle, and the rotating shaft is rotatably connected to the fixed frame. An air blower is installed at the upper end of the rotating shaft, and the rotating shaft is driven by a first motor. The first motor drives the rotating shaft to rotate, which can stir the acidic waste liquid to make the heating more uniform. The air blower can better send the steam into the condenser tube. A reflux pipe is also connected between the distillation kettle and the collection tank. The reflux pipe can generate a circulating airflow between the distillation kettle and the collection tank, making the steam better enter the condenser tube, and at the same time allowing some uncondensed steam to flow back and re-enter the cyclic distillation process. A discharge port is opened at the lower end of the collection tank. The collection tank is also connected to a vacuum pump, and the vacuum pump can reduce the air pressure inside the distillation kettle and the collection tank.

[0005] Preferably, a spiral first cooling pipe is sleeved outside the condenser pipe. Both ends of the first cooling pipe communicate with a cooling pool respectively. A plurality of Peltier cooling rods are installed on the side wall of the cooling pool. The cold ends of the cooling rods extend into the interior of the cooling pool, and the hot ends extend outside the cooling pool. The arrangement of the cooling rods can keep the coolant inside the cooling pool at a low temperature all the time. The reflux pipe is wound around the outside of the hot ends of the cooling rods, and the hot ends of the cooling rods assist in heating the air inside the reflux pipe to prevent premature condensation caused by too low reflux temperature.

[0006] Preferably, a condensation sleeve is connected between the vacuum pump and the collection tank. The condensation sleeve includes an outer sleeve and an inner sleeve. The upper end of the inner sleeve penetrates through the upper end of the outer sleeve and communicates with the collection tank. The side surface of the upper end of the outer sleeve is connected to the vacuum pump, and the connection between the outer sleeve and the vacuum pump is higher than the lower end of the inner sleeve. A small amount of acidic vapor carried in the gas extracted by the vacuum pump from the interior of the collection tank will be condensed again when passing through the condensation sleeve. A discharge port is provided at the lower end of the outer sleeve. A spiral second cooling pipe is also sleeved outside the outer sleeve. Both ends of the second cooling pipe also communicate with the cooling pool respectively.

[0007] Preferably, a diversion plate with a middle-high and four-week-low shape is provided inside the upper end of the collection tank. Arc plates are fixedly connected to the four weeks of the diversion plate. A diversion board is provided on the side of the diversion plate away from the distillation kettle. One end of the diversion board is fixedly connected to the diversion plate, and the other end is attached to the side wall of the collection tank. The diameter of the diversion plate is larger than the inner diameter of the condenser pipe. The diversion plate and the diversion board can make the condensate inside the condenser pipe slowly slide down along the inner side of the collection tank.

[0008] Preferably, a lining sleeve is rotatably connected inside the collection tank and is driven by a second motor. A plurality of partition plates are fixedly connected inside the lining sleeve. The plurality of partition plates divide the interior of the lining sleeve into a plurality of spaces. A cover plate is provided above the lining sleeve. The cover plate is fixedly connected to the inner side wall of the collection tank. An opening is provided on the cover plate and directly below the diversion board. The outer end of the diversion board and on the inner side wall of the collection tank is fixedly connected with a fixing plate. The second motor drives the lining sleeve to rotate, enabling the plurality of spaces formed by the partition plates to sequentially receive the condensate. The space after receiving the condensate will rotate below the cover plate, which can prevent the evaporation loss of the condensate to a certain extent.

[0009] Preferably, a end cover is hinged at the lower opening of the collection tank. A boss is fixedly connected to the inner side surface of the end cover. The boss can make the plurality of spaces formed by the plurality of partition plates not communicate with each other when the end cover is closed, and the end cover is controlled to open and close by an electric push rod for controllable transfer.

[0010] Preferably, the upper end surface of the lining sleeve and the lower end surface of the fixing plate are both inclined surfaces that are higher on the outside and lower on the inside, and the inclined surfaces can prevent the condensate from leaking.

[0011] Preferably, a plurality of pointed condensation rods are fixedly connected inside the condenser tube.

[0012] Preferably, a lifting cylinder penetrating up and down is installed in the distillation kettle, a turbine is connected to the rotating shaft, the lifting cylinder is sleeved outside the turbine, and a fan plate is fixedly connected to the upper end of the rotating shaft, and the fan plate is located outside the lifting cylinder.

[0013] Preferably, a plurality of scraping plates are connected to the fan plate, and the outer ends of the scraping plates are inclined.

[0014] Preferably, the distillation kettle is filled with a filler made of polytetrafluoroethylene.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: through the settings of the inner lining sleeve, the partition plate and the cover plate, the partition plate can divide the inside of the inner lining sleeve into multiple spaces, and the cover plate can expose one space, so that the extracted condensate can be divided into multiple portions, and only one portion of the condensate will be exposed when it is received, thus well avoiding excessive evaporation of the remaining condensate; through the setting of the condensation sleeve, the gas pumped out by the vacuum pump can be first condensed and purified, so that the vacuum pump can be buffered to a certain extent and avoid being damaged; in addition, the present application can use the lifting cylinder, the fan plate and the scraping plate in cooperation to increase the evaporation area and improve the distillation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of the reflux pipe of the present invention;

[0018] Figure 3 is a schematic diagram of the installation state of the electric push rod of the present invention;

[0019] Figure 4 is a sectional view of the distillation kettle of the present invention;

[0020] Figure 5 is a sectional view of the condensation sleeve of the present invention;

[0021] Figure 6 is a sectional view of the condenser tube of the present invention;

[0022] Figure 7 is a schematic diagram of the structure of the diversion plate of the present invention;

[0023] Figure 8 is an exploded view of the inner lining sleeve and the receiving tank of the present invention;

[0024] Figure 9 is a schematic diagram of the closed state of the end cover of the present invention;

[0025] Figure 10 Schematic diagram of the open state of the end cover of the present invention;

[0026] Figure 11 Schematic diagram of the connection between the first cooling pipe and the cooling pool of the present invention;

[0027] Figure 12 Cross-sectional view at the collection tank of the present invention;

[0028] Figure 13 Cross-sectional view of the still pot of Embodiment 2 of the present invention;

[0029] Figure 14 Explosion diagram of the lifting cylinder and the turbine of Embodiment 2 of the present invention.

[0030] In the figure: 1, still pot; 2, collection tank; 3, condenser pipe; 4, discharge pipe; 5, electric heating wire; 6, rotating shaft; 7, air supply fan; 8, reflux pipe; 9, discharge pipe; 10, first cooling pipe; 11, vacuum pump; 12, second cooling pipe; 13, cooling pool; 14, refrigeration rod; 15, condensation sleeve; 150, outer sleeve; 151, inner sleeve; 16, guide plate; 17, arc plate; 18, baffle plate; 19, fixing frame; 20, first motor; 21, inner lining sleeve; 22, partition plate; 23, cover plate; 24, opening; 25, fixing plate; 26, second motor; 27, end cover; 28, boss; 29, condensation rod; 30, chassis; 31, PH detection module; 32, first lift pump; 33, liquid level sensor; 34, electric push rod; 35, control module; 36, lifting cylinder; 37, turbine; 38, fan plate; 39, scraper; 40, packing; 41, second lift pump. Detailed implementation manners

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-14

[0033] Example 1. The present invention provides a technical solution: a treatment system for rare earth wastewater, including a distillation kettle 1 and a collection tank 2. Pressure relief valves and pressure gauges for detecting the internal pressures of the distillation kettle 1 and the collection tank 2 are installed on both the distillation kettle 1 and the collection tank 2. A pH detection module 31 for detecting acidic wastewater is further installed inside the distillation kettle 1. The pressure relief valve can be opened after distillation is completed to restore the normal air pressure inside the distillation kettle 1 and the collection tank 2, so that the distillation residue and the condensate can be better discharged. The pH detection module 31 can detect the pH value of the acidic wastewater inside the distillation kettle 1 in real time, so as to accurately judge the distillation process. A condenser tube 3 is connected between the distillation kettle 1 and the collection tank 2. The distillation kettle 1 and the collection tank 2 are both installed on a chassis 30. The distillation kettle 1 can be used for distilling acidic waste liquid, and the collection tank 2 can collect the condensed condensate. A discharge pipe 4 for discharging acidic wastewater and a discharge pipe 9 for discharging the distillation residue are installed on the distillation kettle 1. Electric valves are installed inside both the discharge pipe 4 and the discharge pipe 9. The connection between the distillation kettle 1 and the outside can be controlled by controlling the opening and closing of the electric valves. A plurality of electric heating wires 5 are installed on the inner side wall of the distillation kettle 1, and the inside of the distillation kettle 1 can be heated by the electric heating wires 5. The distillation kettle 1 is installed with a rotating shaft 6 through a fixing frame 19 fixedly connected inside it. Specifically, as shown in Figure 4A stirring paddle is fixedly connected to the lower side surface of the rotating shaft 6. An air blower 7 is installed at the upper end of the rotating shaft 6. The rotating shaft 6 is driven by a first motor 20. When the motor shaft of the first motor 20 rotates, it drives the rotating shaft 6 to rotate, so that the acidic wastewater inside the distillation kettle can be stirred during heating to make the heating more uniform. At the same time, the rotating shaft 6 can drive the air blower 7 to rotate, and the gas evaporated inside the distillation kettle 1 can be sent into the inside of the condenser tube 3. The setting of the air blower 7 enables the evaporated gas to enter the inside of the condenser tube 3 faster and better for condensation. The first motor 20 is installed on the outer side wall of the distillation kettle 1. The motor shaft of the first motor 20 penetrates through the distillation kettle 1 and the fixing frame 19 and extends into the cavity opened on the fixing frame 19 and is connected to the rotating shaft 6 through a gear set. The rotation of the motor shaft of the first motor 20 can drive the rotating shaft 6 to rotate. A reflux pipe 8 is also connected between the distillation kettle 1 and the collection tank 2. The setting of the reflux pipe 8 can make the gas flowing between the distillation kettle 1 and the collection tank 2 circulate under the action of the air blower 7, so that the gas evaporated inside the distillation kettle 1 can enter the inside of the condenser tube 3 better. At the same time, part of the steam that has not been condensed can also enter the distillation kettle 1 again to participate in the cyclic condensation. A discharge port is opened at the lower end of the collection tank 2. The discharge port on the collection tank 2 can be used to discharge the collected condensate, and a valve is installed on the discharge port of the collection tank 2 to control the discharge of the condensate. The collection tank 2 is also connected to a vacuum pump 11. Through the vacuum pump 11, the gas inside the collection tank 2 and the distillation kettle 1 can be extracted, so as to reduce the air pressure inside the distillation kettle 1 and the collection tank 2, and then the acidic waste liquid inside the distillation kettle 1 can be distilled better.

[0034] Specifically, a spiral first cooling pipe 10 is sleeved outside the condenser tube 3. The two ends of the first cooling pipe 10 are respectively communicated with a cooling pool 13. A coolant is contained inside the cooling pool 13. One end of the first cooling pipe 10 is communicated with the cooling pool 13 through a first lift pump 32. The coolant can be continuously circulated inside the cooling pool 13 and the first cooling pipe 10 through the first lift pump 32. A plurality of Peltier cooling rods 14 (one end is the hot end and the other end is the cold end) are installed on the side wall of the cooling pool 13. The cold end of the cooling rod 14 extends into the inside of the cooling pool 13, and the hot end extends outside the cooling pool 13. The setting of the cooling rod 14 can continuously cool the coolant inside the cooling pool 13, so that the coolant inside the cooling pool 13 always remains in a low temperature state, so that the first cooling pipe 10 can better reduce the temperature around the condenser tube 3 and inside the condenser tube 3, and make the condensation effect better. The reflux pipe 8 is wound around the outside of the hot end of the cooling rod 14. When the reflux pipe 8 bypasses the hot end of the cooling rod 14, the hot end of the cooling rod 14 can heat the gas inside the reflux pipe 8, so as not to affect the temperature inside the distillation kettle 1 and avoid premature condensation due to overcooling and affecting distillation.

[0035] In order to reduce the damage to the vacuum pump 11 caused by acidic steam passing through the vacuum pump 11, a condensation sleeve 15 is provided. Specifically, a condensation sleeve 15 is connected between the vacuum pump 11 and the collection tank 2. The condensation sleeve 15 includes an outer sleeve 150 and an inner sleeve 151. The outer sleeve 150 is installed on the chassis 30. The upper end of the inner sleeve 151 penetrates through the upper end of the outer sleeve 150 and communicates with the collection tank 2. The side surface of the upper end of the outer sleeve 150 is connected to the vacuum pump 11, and the connection between the outer sleeve 150 and the vacuum pump 11 is higher than the lower end of the inner sleeve 151. When the vacuum pump 11 is working, the gas inside the collection tank 2 will first enter the inside of the outer sleeve 150 through the inner sleeve 151, then move upward inside the outer sleeve 150, and finally be pumped out by the vacuum pump 11. A discharge port is provided at the lower end of the outer sleeve 150. A spiral second cooling pipe 12 is also sleeved outside the outer sleeve 150. The two ends of the second cooling pipe 12 also communicate with the cooling pool 13 respectively. The second cooling pipe 12 can condense the gas rising inside the outer sleeve 150 and purify the acidic steam therein, thereby preventing the acidic steam from damaging the vacuum pump 11. An electric valve is also installed inside the discharge port at the lower end of the outer sleeve 150, and the discharge of the condensate inside the outer sleeve 150 can be controlled by controlling the opening and closing of the electric valve on the outer sleeve 150;

[0036] A second lift pump 41 is installed between the second cooling pipe 12 and the cooling pool 13, which can make the coolant continuously circulate inside the cooling pool 13 and the second cooling pipe 12, so that the second cooling pipe 12 can better cool the periphery and inside of the outer sleeve 150.

[0037] To prevent a large number of small droplets from being generated due to the splashing of the condensed liquid when the liquid after condensation flows from the inside of the condenser tube 3 into the collection tank 2, resulting in losses of the condensed liquid due to the evaporation of the small droplets, a diversion disk 16 and a diversion plate 18 are provided. Inside the upper end of the collection tank 2, there is a diversion disk 16 that is higher in the middle and lower around the perimeter. The diversion disk 16 is in an inclined state with a higher middle part. The coolant flowing into the collection tank 2 through the condenser tube 3 will flow onto the diversion disk 16. Moreover, because the distance between the diversion disk 16 and the condenser tube 3 is short, the droplets splashed out by the condensed liquid will be greatly reduced. Also, the droplets splashed by the condensed liquid on the diversion disk 16 will fly into the inside of the condenser tube 3. Since the temperature inside the condenser tube 3 is low, the droplets flying into the inside of the condenser tube 3 will not evaporate but will only flow back onto the diversion disk 16. The diversion disk 16 is fixedly connected with a mounting rod, and the mounting rod is fixedly connected with the inner side wall of the upper end of the collection tank 2. Arc plates 17 are fixedly connected around the perimeter of the diversion disk 16. On the side of the diversion disk 16 away from the distillation kettle 1, there is a diversion plate 18. One end of the diversion plate 18 is fixedly connected with the diversion disk 16, and the other end is in mutual contact with the side wall of the collection tank 2. The setting of the arc plates 17 can prevent the condensed liquid flowing onto the diversion disk 16 from flowing directly down, but rather from flowing along the diversion plate 18 to the inner side wall of the collection tank 2 and finally flowing down along the inner side wall of the collection tank 2, which can well avoid the splashing of the condensed liquid inside the collection tank 2, thereby causing evaporation losses of the splashed droplets. The diameter of the diversion disk 16 is larger than the inner diameter of the condenser tube 3, and all the condensed liquid flowing out of the condenser tube 3 will only flow onto the diversion disk 16.

[0038] In order to prevent the condensate from evaporating inside the collection tank 2, resulting in a loss of the recovered amount of condensate, a lining sleeve 21 is provided. Specifically, a lining sleeve 21 is rotatably connected inside the collection tank 2, and the lining sleeve 21 is driven by a second motor 26. The second motor 26 is installed on the outer side surface of the collection tank 2. The motor shaft of the second motor 26 penetrates through the collection tank 2 and extends into the interior of the collection tank 2, and is connected to the lining sleeve 21 through another gear set. The rotation of the motor shaft of the second motor 26 can drive the lining sleeve 21 to rotate. A plurality of partition plates 22 are fixedly connected inside the lining sleeve 21. The plurality of partition plates 22 are evenly fixedly connected inside the lining sleeve 21. The arrangement of the partition plates 22 can divide the interior of the lining sleeve 21 into a plurality of spaces. A cover plate 23 is provided above the lining sleeve 21. The cover plate 23 is fixedly connected to the inner side wall of the collection tank 2. An opening 24 is provided on the cover plate 23 and directly below the deflector 18. The second motor 26 drives the lining sleeve 21 to rotate, so that the multiple spaces inside the lining sleeve 21 respectively move directly below the opening 24. A liquid level sensor 33 is installed on the side surface of each partition plate 22, which can detect the liquid level height of the condensate collected inside the space formed by the partition plate 22. When the liquid level sensor 33 detects the liquid level, it means that the current space is full of condensate. After that, the second motor 26 will drive the lining sleeve 21 to rotate (each time the second motor 26 starts, it will rotate a corresponding angle to make the lining sleeve 21 rotate a corresponding angle to complete the adjustment of the space formed by the partition plate 22), so that the space formed by the next partition plate 22 continues to receive the condensate, and the other spaces formed by the partition plate 22 will rotate below the cover plate 23 (the cover plate 23 can be made of polytetrafluoroethylene material to form a sealed contact with the top surface of the partition plate 22), thereby minimizing the re-evaporation of the collected condensate and preventing excessive loss of the condensate. A fixing plate 25 is fixedly connected to the outer end of the deflector 18 and on the inner side wall of the collection tank 2. The thickness of the fixing plate 25 is the same as the thickness of the side wall of the lining sleeve 21. The outer end of the deflector 18 is in contact with the fixing plate 25, so that the condensate can flow well along the fixing plate 25 and the inner side wall of the lining sleeve 21 into the interior of the lining sleeve 21.

[0039] Specifically, a end cover 27 is hinged at the lower opening of the charging tank 2. A boss 28 is fixedly connected to the inner side surface of the end cover 27, and the end cover 27 is controlled to open and close by an electric push rod 34. The electric push rod 34 is installed on the chassis 30 and is hinged to the chassis 30. The output rod of the electric push rod 34 is hinged to the end cover 27. The opening and closing of the end cover 27 can be controlled by controlling the telescopic movement of the output rod of the electric push rod 34. The setting of the boss 28 (which can also be made of polytetrafluoroethylene) can separate the space formed by the plurality of partition plates 22 when the end cover 27 is closed, and at the same time can block the gap between the inner lining sleeve 21 and the charging tank 2. When the end cover 27 is opened, the space formed by the plurality of partition plates 22 can communicate with the outside at the same time, and the collected condensate can be discharged simultaneously.

[0040] Specifically, the upper end surface of the inner lining sleeve 21 and the lower end surface of the fixing plate 25 are both inclined surfaces with the outer side higher than the inner side. This setting can effectively prevent the condensate from leaking through the gap between the fixing plate 25 and the inner lining sleeve 21 when flowing down from the fixing plate 25.

[0041] Specifically, a plurality of pointed condensation rods 29 are fixedly connected inside the condensation tube 3. The setting of the condensation rods 29 can enable the steam evaporated inside the distillation kettle 1 to be quickly collected and dripped after condensation. The liquid level sensor 33 is electrically connected to the second motor 26 through a control module 35 installed on the chassis 30. When the liquid level sensor 33 detects the liquid level, it can send a signal to the control module 35 to control the second motor 26 to rotate by a corresponding angle to complete the adjustment of the inner lining sleeve 21.

[0042] The PH detection module 31, the liquid level sensor 33, and the control module 35 are all prior arts, so they will not be elaborated in this invention. For example, the PH detection module 31 can adopt the XZ520 model, the liquid level sensor 33 can adopt the XZ-9055 model, and the control module 35 can adopt the Raspberry Pi 4 development board of Chuangmei CHM.

[0043] The electric heating wire 5, the refrigeration rod 14, the first motor 20, the second motor 26, the PH detection module 31, the first lift pump 32, the second lift pump 41, the liquid level sensor 33, the electric push rod 34, and the control module 35 are respectively connected to an external power supply through cables, and their operation can be controlled by turning the control circuit on and off.

[0044] Embodiment 2: Currently, the evaporation surfaces of existing distillation kettles 1 are all the areas of the liquid surfaces, so their evaporation speeds are restricted by this, and there is a certain volume of obstruction between the evaporation surface and the electric heating wire 5, so boiling over is also likely to occur. Therefore, in order to comprehensively utilize the inner surface of the distillation kettle 1, the structure inside the distillation kettle 1 is changed on the basis of Embodiment 1.

[0045] Specifically, a lifting cylinder 36 that penetrates up and down is installed in the distillation kettle 1. The lifting cylinder 36 is installed and connected to the distillation kettle 1 by accessories around it. A turbine 37 is connected to the rotating shaft 6. The lifting cylinder 36 is sleeved outside the turbine 37. The turbine 37 can not only play the role of stirring the paddle, but also cooperate with the lifting cylinder 36 to lift the liquid material to the upper end of the lifting cylinder 36. The upper end of the rotating shaft 6 is fixedly connected with a fan plate 38. The fan plate 38 is located outside the lifting cylinder 36. The lifted liquid material will fall on the fan plate 38 and then scatter downward. At the same time, since the fan plate 38 is connected to the rotating shaft 6, as the rotating shaft 6 runs, the fan plate 38 rotates, and the liquid material on it will be thrown towards the inner wall of the distillation kettle 1 under the influence of centrifugal force, so that it slides downward along the inside of the distillation kettle 1, thereby forming a liquid film on the inner surface of the distillation kettle 1, making full use of the inner surface area of the distillation kettle 1 and improving the evaporation efficiency.

[0046] Further, in order to make the liquid material that falls on the distillation kettle 1 spread evenly and facilitate evaporation, a plurality of scraping plates 39 are connected to the fan plate 38. The scraping plates 39 can also be made of polytetrafluoroethylene and have a fine gap (such as 1-3 mm) with the distillation kettle 1, which is convenient for scraping to form a film and conducive to liquid evaporation. And the outer peripheral circle of the outer end of the scraping plate 39 is in an inclined state as Figure 12 shown. While rotating and scraping, it descends along the side wall of the distillation kettle 1, so as to make full use of the side wall area of the distillation kettle 1 for evaporation.

[0047] In addition, in order to increase the gasification point and effectively lift the liquid material by the turbine 37, the distillation kettle 1 is filled with a filler 40 made of polytetrafluoroethylene. The filler 40 can be micro-particles (such as with a particle size less than 3 mm) or powder made of polytetrafluoroethylene, so that it can be more smoothly lifted from the bottom of the distillation kettle 1 to the upper part by the turbine 37. The micro-particles or powder made of polytetrafluoroethylene will carry the liquid material in the distillation kettle 1 during the lifting process, so that the liquid material is also lifted. The micro-particles or powder made of polytetrafluoroethylene entraining the liquid material are thrown onto the side wall of the distillation kettle 1, and under the scraping action of the scraping plate 39, the micro-particles or powder of the filler 40 made of polytetrafluoroethylene are scraped off, and part of the liquid will adhere to the side wall of the distillation kettle 1 to participate in subsequent evaporation and gasification, while the scraped micro-particles or powder of the filler 40 made of polytetrafluoroethylene are reused.

[0048] For the structure of Embodiment 2, the distillation kettle 1 can be made into a "tall and thin" kettle body to improve the space utilization rate.

[0049] Working principle: When in use, the acidic wastewater to be treated is discharged into the interior of the distillation kettle 1. Then, start the vacuum pump 11 to reduce the air pressure inside the distillation kettle 1 and the collection tank 2. After that, the electric heating wire 5 and the first motor 20 can be started. The electric heating wire 5 can distill the acidic wastewater inside the distillation kettle 1, and the first motor 20 can drive the rotating shaft 6 to rotate, which can not only make the acidic wastewater be better distilled, but also enable the steam at the distillation site to better enter the interior of the condenser tube 3. After the steam enters the interior of the condenser tube 3, it will condense into a liquid and flow onto the diversion plate 16, and then flow along the diversion plate 18 and the fixing plate 25 into the interior of the inner lining sleeve 21;

[0050] When all the spaces formed by the partition plate 22 are filled with the coolant, the air pressure inside the distillation kettle 1 and the collection tank 2 is restored to normal through the pressure relief valve. Then, open the electric valves at the discharge pipe 9 and the discharge port of the outer sleeve pipe 150. At the same time, open the cover plate 23 through the electric push rod 28 to discharge the distillation residue and the condensate together, and the filler 40 can be recycled and reused.

[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A treatment system for rare earth wastewater, comprising a distillation kettle (1) and a collection tank (2), and a condenser tube (3) is connected between the distillation kettle (1) and the collection tank (2). A discharge pipe (4) and a drain pipe (9) are installed on the distillation kettle (1). A discharge port is opened at the lower end of the collection tank (2). The collection tank (2) is also connected to a vacuum pump (11), and it is characterized in that: A plurality of electric heating wires (5) are installed on the inner side wall of the distillation kettle (1). The distillation kettle (1) is equipped with a rotating shaft (6). An air supply fan (7) is installed at the upper end of the rotating shaft (6). A lifting cylinder (36) that penetrates up and down is installed in the distillation kettle (1). A turbine (37) is connected to the rotating shaft (6). The lifting cylinder (36) is sleeved outside the turbine (37). A fan plate (38) is fixedly connected to the upper end of the rotating shaft (6). The fan plate (38) is located outside the lifting cylinder (36). A plurality of scraping plates (39) are connected to the fan plate (38). Inside the upper end of the collection tank (2), there is a diversion plate (16) with a middle higher and a surrounding lower. Arc plates (17) are fixedly connected to the four sides of the diversion plate (16). A diversion board (18) is arranged on the side of the diversion plate (16) away from the distillation kettle (1). An installation rod is fixedly connected to the diversion plate (16), and the installation rod is fixedly connected to the inner side wall of the upper end of the collection tank (2). A lining sleeve (21) is rotatably connected inside the collection tank (2), and the lining sleeve (21) is driven by a second motor (26). A plurality of partition plates (22) are fixedly connected inside the lining sleeve (21). A cover plate (23) is arranged above the lining sleeve (21). The cover plate (23) is fixedly connected to the inner side wall of the collection tank (2). An opening (24) is arranged on the cover plate (23) and directly below the diversion board (18). A fixing plate (25) is fixedly connected to the outer end of the diversion board (18) and on the inner side wall of the collection tank (2).

2. The treatment system for rare earth wastewater according to claim 1, wherein: A spiral first cooling pipe (10) is sleeved outside the condensing pipe (3). The two ends of the first cooling pipe (10) are respectively communicated with a cooling pool (13). A plurality of Peltier cooling rods (14) are installed on the side wall of the cooling pool (13). The cold ends of the cooling rods (14) extend into the interior of the cooling pool (13), and the hot ends extend outside the cooling pool (13). One end of the first cooling pipe (10) is communicated with the cooling pool (13) through a first lift pump (32).

3. The treatment system for rare earth wastewater according to claim 2, wherein: A reflux pipe (8) is also connected between the distillation kettle (1) and the collection tank (2). The reflux pipe (8) is wound around the outside of the hot end of the cooling rod (14).

4. The treatment system for rare earth wastewater according to claim 2, wherein: A condensing sleeve (15) is connected between the vacuum pump (11) and the collection tank (2). The condensing sleeve (15) includes an outer sleeve (150) and an inner sleeve (151). The upper end of the inner sleeve (151) penetrates through the upper end of the outer sleeve (150) and is communicated with the collection tank (2). The upper side of the upper end of the outer sleeve (150) is connected to the vacuum pump (11), and the connection between the outer sleeve (150) and the vacuum pump (11) is higher than the lower end of the inner sleeve (151).

5. The treatment system for rare earth wastewater according to claim 4, characterized in that: A spiral second cooling pipe (12) is also sleeved outside the outer sleeve (150). The two ends of the second cooling pipe (12) are also respectively communicated with the cooling pool (13). A second lift pump (41) is installed between the second cooling pipe (12) and the cooling pool (13).

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