A method for recovering rare earth from rare earth wastewater and a rare earth wastewater treatment line

Abstract

The present application relates to the technical field of rare earth wastewater treatment, and discloses a recovery method for recovering rare earth from rare earth wastewater and a rare earth wastewater treatment line, wherein a rare earth wastewater treatment line comprises a primary filter device, a rare earth recovery device, a purification device and a neutralization device, wherein the primary filter device is connected to the rare earth recovery device, the primary filter device is used to remove suspended matter and particulate matter in the rare earth wastewater, the rare earth recovery device comprises a reactor, a stirring component, a drainage component and a filtering component, the stirring component is used to stir the rare earth wastewater, the drainage component is used to discharge the treated rare earth wastewater, the filtering component is used to separate the adsorption material, the filtering component divides the space in the reactor, the filtering component can be raised and lowered, the side of the filtering component close to the top of the reactor is a treatment chamber, the neutralization device is used to adjust the pH of the rare earth wastewater discharged from the treatment chamber, and the purification device is used to separate and purify the rare earth ions. The present application can alleviate the problem of waste of rare earth materials.

Description

Technical Field

[0001] The present application relates to the field of rare earth wastewater treatment, and in particular to a recovery method for recovering rare earths from rare earth wastewater and a rare earth wastewater treatment line. Background Art

[0002] Rare earth is an extremely important strategic resource, known as "industrial gold". Due to its excellent optical, electromagnetic and other physical properties, it can be combined with other materials to form a variety of new materials with different properties. Its most significant function is to greatly improve the quality and performance of other products. For example, it can greatly improve the tactical performance of steel, aluminum alloy, magnesium alloy and titanium alloy used in the manufacture of tanks, aircraft and missiles. Moreover, rare earth is also a lubricant for many high-tech industries such as electronics, lasers, nuclear industry and superconductivity.

[0003] In the rare earth treatment process, sedimentation wastewater and leaching wastewater are generated, and some rare earth particles are mixed in these wastewaters. At present, these wastewaters are usually discharged directly through wastewater pipelines, causing the rare earth particles in the wastewater to be lost.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there is a defect of wasting rare earth materials. Summary of the invention

[0005] In order to alleviate the problem of rare earth material waste, the present application provides a recovery method for recovering rare earths from rare earth wastewater and a rare earth wastewater treatment line.

[0006] The rare earth wastewater treatment line provided in this application adopts the following technical solution:

[0007] A rare earth wastewater treatment line, comprising a primary filtration device, a rare earth recovery device, a purification device and a neutralization device, wherein the primary filtration device is connected to the rare earth recovery device, the primary filtration device is used to remove suspended matter and particulate matter in the rare earth wastewater, the rare earth recovery device comprises a reactor, a stirring component, a drainage component and a filtering component, the stirring component is used to stir the rare earth wastewater, the drainage component is used to discharge the treated rare earth wastewater, the filtering component is used to separate adsorption materials, the filtering component divides the space in the reactor, the filtering component can be raised and lowered, the side of the filtering component close to the top of the reactor is a processing chamber, the reactor A water inlet, a drain outlet, an eluent inlet and an eluent outlet are provided on the side wall of the reactor. The primary filtration device is connected to the treatment chamber via the water inlet, and both the eluent inlet and the drain outlet are connected to the treatment chamber. The drain assembly is connected to the neutralization device via the drain outlet, and the neutralization device is used to adjust the pH value of the rare earth wastewater discharged from the treatment chamber. The eluent outlet is located near the bottom of the reactor, and the filtration assembly can be moved to the side of the eluent outlet near the top of the reactor. The purification device is connected to the eluent outlet, and the purification device is used to separate rare earth ions from the eluent and purify the rare earth ions.

[0008] By adopting the above technical scheme, rare earth wastewater enters the treatment chamber through the water inlet after being filtered by the primary filtration equipment, and the rare earth wastewater is stirred by the stirring component. Through the stirring action, the contact between the wastewater and the adsorption material is enhanced, the adsorption efficiency is improved, and the rare earth ions are adsorbed on the surface of the material or in the internal pores. After the adsorption is completed, the wastewater in the treatment chamber is discharged into the neutralization equipment through the drainage port by the drainage component, and the pH value of the wastewater is adjusted by the neutralization equipment to meet the discharge requirements; after the wastewater is discharged, an appropriate amount of eluent enters the treatment chamber through the eluent inlet, and the rare earth ions are desorbed from the adsorption material by changing the solution environment. During the desorption process, the stirring component continues to stir, so that the adsorption material and the eluent are fully in contact, and the desorption efficiency is improved; after the desorption is completed, the filter component moves toward the top of the reactor, so that the eluent outlet is located on the side of the filter component away from the treatment chamber, and the adsorption material is retained in the treatment chamber by the filter component, and the rare earth ions enter the purification equipment through the eluent outlet with the eluent for separation and purification, thereby realizing efficient treatment of rare earth wastewater and effective recovery of rare earth elements.

[0009] Optionally, the stirring assembly includes a drive motor, an inner ring gear, a planetary disk, a sun gear, a plurality of planetary gears and a plurality of stirring rods, the planetary disk is connected to the reactor, the drive motor is connected to the planetary disk and the drive motor is transmission-connected to the sun gear, the plurality of planetary gears are arranged at intervals along the circumference of the sun gear and the planetary gears are meshed with the sun gear, the inner ring gear is sleeved on the outside of the planetary gears and the planetary gears are meshed with the inner ring gear, the inner ring gear is fixedly connected to the planetary disk, the planetary gears are connected to the planetary disk, the plurality of planetary gears are arranged in one-to-one correspondence with the plurality of stirring rods, the stirring rods are coaxially and fixedly connected to the corresponding planetary gears, and spiral blades are arranged on the side walls of the stirring rods.

[0010] By adopting the above technical solution, the sun gear rotates under the drive of the driving motor, and the multiple planetary gears rotate around the sun gear while rotating on their own, thereby driving the multiple stirring rods to rotate, and the stirring rods are used to stir the rare earth wastewater in the treatment chamber; in addition, spiral blades are provided on the side walls of the stirring rods. During the rotation of the stirring rods, the spiral blades drive the rare earth wastewater in the treatment chamber to flow in the axial direction of the reactor, thereby making the mixing of the adsorption material and the rare earth wastewater more uniform, thereby improving the adsorption efficiency of rare earth ions.

[0011] Optionally, the drainage assembly includes a first drain pipe and a second drain pipe, the first drain pipe is coaxially arranged with the sun gear, one end of the first drain pipe is rotatably connected to the sun gear, a plurality of water filter ports for waste water to enter are opened on the side wall of the first drain pipe, one end of the second drain pipe is connected to the first drain pipe, and the other end of the second drain pipe is connected to the neutralization device through the drain port.

[0012] By adopting the above technical scheme, after the rare earth ions in the rare earth wastewater are adsorbed, the treated wastewater enters the first drain pipe from the water filter outlet and then flows into the neutralization equipment from the drain outlet through the second drain pipe. The adsorption material is filtered by the water filter outlet, so that the adsorption material adsorbed with rare earth ions is retained in the treatment chamber.

[0013] Optionally, the filter assembly includes a partition and a lifting member, the partition is sealingly and slidingly connected to the inner wall of the reactor, a plurality of filter ports are opened on the partition, the lifting member is connected to the partition, and the lifting member is used to drive the partition to move along the height direction of the reactor.

[0014] By adopting the above technical solution, after the adsorbent material is eluted, the lifting member drives the partition to move toward the upper end of the reactor, so that the eluent outlet is located on the side of the partition away from the treatment chamber, and the adsorbent material is filtered by the partition so that the eluted adsorbent material is retained in the treatment chamber. The eluent containing rare earth ions flows from the filter port to the bottom of the partition and is transported to the purification equipment through the eluent outlet for purification treatment.

[0015] Optionally, the lifting member includes an electric push cylinder, which is arranged on the reactor, and the piston rod of the electric push cylinder is fixedly connected to the planetary disk, and one end of the first drain pipe away from the sun gear is fixedly connected to the partition.

[0016] By adopting the above technical solution, the piston rod of the electric push cylinder is fixedly connected to the planetary disk, the end of the first drain pipe away from the sun gear is fixedly connected to the partition, the electric push cylinder drives the partition to move through the first drain pipe, and the positional relationship between the lower end of the first drain pipe and the partition remains fixed, thereby ensuring the drainage effect of the first drain pipe and allowing the treated rare earth wastewater to be fully discharged.

[0017] Optionally, the primary filtration equipment includes a box body and a filter screen, the box body is fixedly connected to the reactor, and an inlet and an outlet are respectively provided on two opposite side walls of the box body, the outflow outlet is connected to the water inlet, the filter screen is fixedly connected to the box body and vertically arranged, the filter screen divides the interior of the box body into a first chamber and a second chamber, the inlet is connected to the first chamber, and the outlet is connected to the second chamber, a waste outlet is provided at the bottom of the box body, and the waste outlet is connected to the first chamber, and a switch valve for controlling the opening and closing of the waste outlet is connected to the box body.

[0018] By adopting the above technical scheme, rare earth wastewater enters the box through the inlet, and is preliminarily filtered by the filter to remove suspended matter and particulate matter in the rare earth wastewater, thereby obtaining relatively clear rare earth wastewater, so as to reduce the interference of impurities in the subsequent treatment process and improve the recovery efficiency of rare earth ions; the filtered suspended matter and particulate matter are accumulated at the bottom of the first chamber under the action of gravity, and the primary filtration equipment discharges the filtered suspended matter and particulate matter in the box through the waste outlet after a period of use.

[0019] Optionally, a heat exchange coil is provided at the bottom of the reactor, and the heat exchange coil is used to adjust the temperature of the rare earth wastewater in the reactor.

[0020] In order to alleviate the problem of rare earth material waste, the present application also provides a recovery method for recovering rare earths from rare earth wastewater.

[0021] The present application provides a method for recovering rare earths from rare earth wastewater, which adopts the following technical solution:

[0022] The recovery method uses the above-mentioned rare earth wastewater treatment line;

[0023] The recovery method mainly comprises the following steps:

[0024] S1: Primary filtration, transporting rare earth wastewater into the primary filtration equipment to filter suspended matter and particulate matter in the rare earth wastewater;

[0025] S2: Rare earth ion adsorption, the rare earth wastewater after primary filtration is transported to the treatment chamber of the rare earth recovery equipment, and the rare earth ions in the rare earth wastewater are adsorbed using ion exchange resin or zeolite as adsorption material;

[0026] S3: Secondary filtration, the rare earth wastewater is extracted from the treatment chamber, so that the adsorption material adsorbed with rare earth ions is retained in the treatment chamber, and the rare earth wastewater extracted from the treatment chamber is transported to the neutralization equipment for pH adjustment;

[0027] S4: Neutralization, transporting the rare earth wastewater extracted from the treatment chamber into the neutralization equipment for pH adjustment;

[0028] S5: eluting, adding an eluent into the treatment chamber to elute the adsorption material adsorbed with the rare earth ions, so as to elute the rare earth ions from the adsorption material;

[0029] S6: re-filtering to separate the adsorbent from the eluent, so that the adsorbent remains in the treatment chamber, and the eluent carrying the rare earth ions is transported to the purification equipment for collection;

[0030] S7: Purification, using purification equipment to separate rare earth ions from eluent and purify rare earth ions.

[0031] By adopting the above technical scheme, before the rare earth elements are recovered, a preliminary filtration is first performed to remove suspended matter and particulate matter in the rare earth wastewater, so as to obtain relatively clear rare earth wastewater, so as to reduce the interference of impurities in the subsequent treatment process and improve the recovery efficiency of rare earth ions; the rare earth wastewater after the preliminary filtration is transported to the treatment chamber, and the rare earth ions are adsorbed on the surface or in the internal pores of the material through the physical and chemical properties of the adsorption material, and the rare earth wastewater is filtered again, and the treated rare earth wastewater is separated from the adsorption material adsorbed with the rare earth ions, so that the adsorption material adsorbed with the rare earth ions is adsorbed. The material is retained in the treatment chamber; an appropriate amount of eluent is added to the treatment chamber, and the rare earth ions are desorbed from the adsorption material by changing the solution environment, and the adsorption material is retained in the treatment chamber by filtering again for reuse; the rare earth ions flow out of the treatment chamber with the eluent and are collected, and the rare earth ions are separated and purified from the eluent to obtain high-purity rare earth products. Through the fine filtering, adsorption, elution, separation and purification steps, the purpose of efficiently recovering rare earth resources from rare earth wastewater is achieved, the problem of waste of rare earth materials is alleviated, and significant environmental and economic benefits are achieved.

[0032] In order to alleviate the problem of rare earth material waste, the present application also provides a rare earth wastewater treatment line.

[0033] The rare earth wastewater treatment line provided in this application adopts the following technical solution:

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] By performing a preliminary filtration before recycling the rare earth elements to remove suspended matter and particulate matter in the rare earth wastewater, relatively clear rare earth wastewater is obtained to reduce the interference of impurities in the subsequent treatment process and improve the recovery efficiency of rare earth ions; the rare earth wastewater after the preliminary filtration is transported to the treatment chamber, and the rare earth ions are adsorbed on the surface or in the internal pores of the material through the physical and chemical properties of the adsorption material, and the rare earth wastewater is filtered again to separate the treated rare earth wastewater from the adsorption material adsorbed with the rare earth ions, so that the adsorption material adsorbed with the rare earth ions is retained. In the treatment chamber; adding an appropriate amount of eluent to the treatment chamber, desorbing the rare earth ions from the adsorption material by changing the solution environment, and retaining the adsorption material in the treatment chamber by filtering again for reuse; the rare earth ions flow out of the treatment chamber with the eluent for collection, and the rare earth ions are separated and purified from the eluent to obtain a high-purity rare earth product. Through the fine filtering, adsorption, elution, separation and purification steps, the purpose of efficiently recovering rare earth resources from rare earth wastewater is achieved, the problem of waste of rare earth materials is alleviated, and significant environmental protection and economic benefits are achieved;

[0036] The sun gear rotates under the drive of the driving motor, and the multiple planetary gears rotate around the sun gear while rotating on their own, thereby driving the multiple stirring rods to rotate, and the stirring rods are used to stir the rare earth wastewater in the treatment chamber. In addition, spiral blades are arranged on the side walls of the stirring rods. During the rotation of the stirring rods, the spiral blades drive the rare earth wastewater in the treatment chamber to flow in the axial direction of the reactor, so that the adsorption material and the rare earth wastewater are mixed more evenly, thereby improving the adsorption efficiency of rare earth ions;

[0037] By fixedly connecting the piston rod of the electric push cylinder with the planetary disk, the end of the first drain pipe away from the sun gear is fixedly connected to the partition, and the electric push cylinder drives the partition to move through the first drain pipe. The positional relationship between the lower end of the first drain pipe and the partition remains fixed, thereby ensuring the drainage effect of the first drain pipe and allowing the treated rare earth wastewater to be fully discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0040] Figure 2 is a cross-sectional view of a primary filtration device and a rare earth recovery device in an embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the internal structure of the rare earth recovery equipment in the embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the structure of the stirring component part in the embodiment of the present application.

[0043] Figure numerals: 100, primary filtration equipment; 110, housing; 111, inlet; 112, outlet; 113, waste outlet; 120, filter; 200, rare earth recovery equipment; 210, reactor; 211, treatment chamber; 212, water inlet; 213, drain outlet; 214, eluent outlet; 215, eluent inlet; 220, stirring assembly; 221, drive motor; 222, inner gear ring; 223, planetary disk; 224, stirring rod; 225, spiral blade; 230, drain assembly; 231, first drain pipe; 232, second drain pipe; 233, water filter outlet; 234, water pump; 240, filter assembly; 241, partition; 242, electric push cylinder; 243, filter outlet; 250, heat exchange coil; 300, purification equipment; 400, neutralization equipment. DETAILED DESCRIPTION

[0044] In order to more clearly explain the overall concept of this application, the following Figure 1-Figure 4 This application is described in further detail.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The present application embodiment discloses a rare earth wastewater treatment line. Figure 1 A rare earth wastewater treatment line includes a primary filter device 100, a rare earth recovery device 200, a purification device 300 and a neutralization device 400. The primary filter device 100 is connected to the rare earth recovery device 200, the primary filter device 100 is used to remove suspended matter and particulate matter in the rare earth wastewater, the rare earth recovery device 200 is used to adsorb rare earth ions in the rare earth wastewater, and the purification device 300 is connected to the rare earth recovery device 200, and the purification device 300 is used to separate rare earth ions from eluent and purify rare earth ions.

[0048] Reference Figure 1 and Figure 2 The primary filtration device 100 includes a housing 110 and a filter 120. The housing 110 is fixedly connected to the reactor 210. An inlet 111 and an outlet 112 are respectively provided on the opposite side walls of the housing 110. The outlet 112 is connected to the rare earth recovery device 200. The filter 120 is fixedly connected to the housing 110 and is vertically arranged. The filter 120 divides the interior of the housing 110 into a first chamber and a second chamber. The inlet 111 is connected to the first chamber, and the outlet 112 is connected to the second chamber. The outlet 112 is located near the bottom of the housing 110. A waste outlet 113 is provided at the bottom of the housing 110. The waste outlet 113 is connected to the first chamber. A switch valve for controlling the opening and closing of the waste outlet 113 is connected to the housing 110.

[0049] When treating rare earth wastewater, the rare earth wastewater first enters the housing 110 through the inlet 111, and the filter 120 is used to perform preliminary filtration on the rare earth wastewater to remove suspended matter and particulate matter in the rare earth wastewater, thereby obtaining relatively clear rare earth wastewater, so as to reduce the interference of impurities in the subsequent treatment process and improve the recovery efficiency of rare earth ions. The filtered suspended matter and particulate matter accumulate at the bottom of the first chamber under the action of gravity, and the primary filtration device 100 discharges the filtered suspended matter and particulate matter in the housing 110 through the waste outlet 113 after a period of use. The relatively clear rare earth wastewater after the preliminary filtration enters the rare earth recovery device 200 through the outlet 112.

[0050] Reference Figure 2 and Figure 3, the rare earth recovery equipment 200 includes a reactor 210, a stirring assembly 220, a drainage assembly 230 and a filter assembly 240. The stirring assembly 220 is used to stir the rare earth wastewater, the drainage assembly 230 is used to discharge the treated rare earth wastewater, and the filter assembly 240 is used to separate the adsorbent material. The filter assembly 240 divides the space in the reactor 210, and the filter assembly 240 can be raised and lowered. The side of the filter assembly 240 close to the top of the reactor 210 is a processing chamber 211. The side wall of the reactor 210 is provided with a water inlet 212, a drainage outlet 213, an eluent inlet 215 and an eluent outlet 214. The outflow port 112 of the box 110 is connected to the water inlet 212 of the reactor 210. The eluent inlet 215 and the drainage outlet 213 are both connected to the processing chamber 211. The drainage assembly 230 is connected to the neutralization device 400 through the drainage port 213, and the neutralization device 400 is used to adjust the pH of the rare earth wastewater discharged from the treatment chamber 211. The eluent outlet 214 is located near the bottom of the reactor 210, and the filter assembly 240 can be moved to the side of the eluent outlet 214 near the top of the reactor 210. The purification device 300 is connected to the eluent outlet 214.

[0051] After the initial filtration, the relatively clear rare earth wastewater enters the treatment chamber 211 through the water inlet 212, and the rare earth wastewater is stirred by the stirring component 220. The stirring effect enhances the contact between the wastewater and the adsorption material, improves the adsorption efficiency, and allows the rare earth ions to be adsorbed on the surface of the material or in the internal pores. After the adsorption is completed, the wastewater in the treatment chamber 211 is discharged into the neutralization equipment 400 through the drain port 213 using the drainage component 230, and the pH value of the wastewater is adjusted using the neutralization equipment 400 to meet the discharge requirements.

[0052] After the wastewater is discharged, an appropriate amount of eluent enters the treatment chamber 211 through the eluent inlet 215, and the rare earth ions are desorbed from the adsorbent material by changing the solution environment. During the desorption process, the stirring component 220 continues to stir so that the adsorbent material is fully in contact with the eluent, thereby improving the desorption efficiency. After the desorption is completed, the filter component 240 moves toward the top of the reactor 210, so that the eluent outlet 214 is located on the side of the filter component 240 away from the treatment chamber 211, and the adsorbent material is retained in the treatment chamber 211 by the filter component 240. The eluent enters the purification device 300 through the eluent outlet 214 for purification, thereby achieving efficient treatment of rare earth wastewater and effective recovery of rare earth elements.

[0053] Reference Figure 3 and Figure 4The stirring assembly 220 includes a driving motor 221, an inner gear ring 222, a planetary disc 223, a sun gear, a plurality of planetary gears and a plurality of stirring rods 224. The planetary disc 223 is mounted on the reactor 210, the driving motor 221 is fixedly connected to the planetary disc 223 and the output shaft of the driving motor 221 is transmission-connected to the sun gear. A plurality of planetary gears are arranged at intervals along the circumference of the sun gear and the planetary gears are meshed with the sun gear. The inner gear ring 222 is sleeved on the outer side of the planetary gears and the planetary gears are meshed with the inner gear ring 222, the inner gear ring 222 is fixedly connected to the planetary disc 223, and the planetary gears are connected to the planetary disc 223. A plurality of planetary gears are arranged one by one with a plurality of stirring rods 224, and the stirring rods 224 are coaxially fixedly connected with the corresponding planetary gears. A spiral blade 225 is fixedly connected to the side wall of the stirring rod 224, and the spiral blade 225 is spirally arranged along the axial direction of the stirring rod 224.

[0054] The sun gear rotates under the drive of the driving motor 221, and the multiple planetary gears rotate while rotating around the sun gear, thereby driving the multiple stirring rods 224 to rotate, and the rare earth wastewater in the treatment chamber 211 is stirred during the rotation of the stirring rods 224. In addition, by installing a spiral blade 225 on the side wall of the stirring rod 224, during the rotation of the stirring rod 224, the spiral blade 225 drives the rare earth wastewater in the treatment chamber 211 to flow in the axial direction of the reactor 210, reducing the possibility of the adsorption material gathering at the bottom of the reactor 210 under the action of gravity, so that the adsorption material and the rare earth wastewater are mixed more evenly, and the adsorption efficiency of rare earth ions is improved.

[0055] Reference Figure 2 and Figure 3 The drainage assembly 230 includes a first drainage pipe 231, a second drainage pipe 232 and a water pump 234. The first drainage pipe 231 is coaxially arranged with the sun gear. One end of the first drainage pipe 231 is rotatably connected with the sun gear. A plurality of water filter ports 233 for wastewater to enter are provided on the side wall of the first drainage pipe 231. One end of the second drainage pipe 232 is connected with the first drainage pipe 231. The other end of the second drainage pipe 232 is connected with the drainage port 213. The second drainage pipe 232 is a bendable hose. The neutralization device 400 is connected with the drainage port 213 through the water pump 234. The plurality of water filter ports 233 are evenly distributed on the side wall of the first drainage pipe 231. The side wall of the first drainage pipe 231 is a filter screen structure. In this embodiment, the diameter of the adsorbent material is three times the diameter of the water filter port 233. In other preferred embodiments, the diameter of the adsorbent material is between three and five times the diameter of the water filter port 233.

[0056] After the adsorption of rare earth ions in the rare earth wastewater is completed, the treated wastewater is extracted by a water pump 234. The treated wastewater enters the first drain pipe 231 through the water filter port 233 and then flows into the neutralization equipment 400 from the drain port 213 through the second drain pipe 232. The adsorption material is filtered by the water filter port 233, so that the adsorption material adsorbed with rare earth ions is retained in the treatment chamber 211. The water pump 234 is an intermittent water pump. When the water pump 234 extracts wastewater, the adsorption material adheres to the outer wall of the first drain pipe 231. The water pump 234 stops working after the set extraction time. The adsorption material leaves the outer wall of the first drain pipe 231 under the action of the centrifugal force generated by the rotation of the stirring rod 224, and the water pump 234 continues to extract wastewater, thereby alleviating the problem of the adsorption material blocking the water filter port 233 and affecting the working efficiency of the water pump 234; the set working time of the water pump 234 is 18-22s, the stop time is 2-6s, and it works in a cycle; in this embodiment, the set working time of the intermittent water pump is 20s, and the stop time is 4s.

[0057] After the rare earth wastewater enters the neutralization device 400, an acid solution and an alkaline solution are added to the neutralization device 400 according to the acidity and alkalinity of the wastewater to adjust the pH value of the wastewater so that it meets the discharge requirements.

[0058] The filter assembly 240 includes a partition 241 and a lifting member. The partition 241 is sealingly and slidably connected to the inner wall of the reactor 210, and a plurality of filter ports 243 are provided on the partition 241. The lifting member includes an electric push cylinder 242, which is arranged on the reactor 210, and the piston rod of the electric push cylinder 242 is fixedly connected to the planetary disk 223, and the end of the first drain pipe 231 away from the sun gear is fixedly connected to the partition 241.

[0059] After the adsorbent material is eluted, the electric push cylinder 242 drives the partition 241 to move toward the upper end of the reactor 210 through the first drain pipe 231, so that the eluent outlet 214 is located on the side of the partition 241 away from the processing chamber 211, and the adsorbent material is filtered by the partition 241, so that the eluted adsorbent material is retained in the processing chamber 211, and the eluent with rare earth ions flows from the filter port 243 to the bottom of the partition 241, and is transported to the purification device 300 through the eluent outlet 214 for purification. When the partition 241 moves to the top of the eluent outlet 214, the drive motor 221 is located below the top wall of the reactor 210.

[0060] The partition 241 moves with the first drain pipe 231, and the positional relationship between the lower end of the first drain pipe 231 and the partition 241 remains fixed. When the partition 241 is located at the bottom of the reactor 210, the lower end of the first drain pipe 231 is also located at the bottom of the reactor 210, thereby ensuring the drainage effect of the first drain pipe 231, so that the treated rare earth wastewater can be fully discharged, reducing the possibility of affecting the subsequent elution treatment due to insufficient discharge of the suction wastewater.

[0061] After the eluent carrying rare earth ions enters the purification device 300 through the eluent outlet 214, a precipitant is added to the purification device 300. In the embodiment of the present application, oxalate is used to precipitate the rare earth ions from the solution. During the precipitation process, the purification device 300 stirs the solution.

[0062] Reference Figure 2 and Figure 3 A heat exchange coil 250 is fixedly connected to the bottom of the reactor 210 , and the heat exchange coil 250 is used to adjust the temperature of the rare earth wastewater in the reactor 210 .

[0063] By installing a heat exchange coil 250 at the bottom of the reactor 210, the heat exchange coil 250 is used to exchange heat with the rare earth wastewater in the reactor 210, and the temperature in the reactor 210 is adjusted according to the temperature requirements of rare earth ion adsorption and elution, thereby improving the efficiency of wastewater treatment and rare earth ion recovery; in addition, before eluting the adsorption material adsorbed with rare earth ions, a small amount of rare earth wastewater is inevitably residual in the treatment chamber 211 and the filter port 243 of the partition 241. The heat exchange coil 250 is used to heat the inside of the treatment chamber 211 to evaporate the residual rare earth wastewater, thereby reducing the possibility of the rare earth wastewater remaining in the treatment chamber 211 mixing with the eluent, avoiding affecting the subsequent elution and purification steps.

[0064] The present application also discloses a method for recovering rare earth from rare earth wastewater, which mainly includes the following steps:

[0065] S1: primary filtration, the rare earth wastewater is transported into the primary filtration device 100, the rare earth wastewater enters the first chamber of the box 110 through the inlet 111, and the rare earth wastewater is filtered by the filter 120, so that the suspended matter and particulate matter in the rare earth wastewater are retained in the first chamber of the box 110, and relatively clear rare earth wastewater is obtained, so as to reduce the interference of impurities in the subsequent treatment process and improve the recovery efficiency of rare earth ions;

[0066] S2: Rare earth ion adsorption, the relatively clear rare earth wastewater after primary filtration is transported to the treatment chamber 211 of the reactor 210 through the outflow port 112 and the water inlet 212, and the rare earth wastewater is stirred by the stirring assembly 220 to enhance the contact between the wastewater and the adsorption material, and the ion exchange resin or zeolite is used as the adsorption material to adsorb the rare earth ions in the rare earth wastewater through the physical and chemical properties of the adsorption material, so that the rare earth ions are adsorbed on the surface of the material or in the internal pores. The ion exchange resin used in this embodiment is sulfonic acid styrene resin. In other preferred embodiments, other strong acid ion exchange resins can also be selected;

[0067] S3: Secondary filtration, the rare earth wastewater in the treatment chamber 211 is extracted by the first drain pipe 231 and the second drain pipe 232, the treated wastewater enters the first drain pipe 231 through the water filter port 233, and then flows out of the treatment chamber 211 from the drain port 213 through the second drain pipe 232, and the adsorption material is filtered by the water filter port 233, so that the adsorption material adsorbed with rare earth ions is retained in the treatment chamber 211;

[0068] S4: Neutralization, the rare earth wastewater extracted from the treatment chamber 211 is transported to the neutralization equipment 400 for pH adjustment;

[0069] S5: Elution, adding eluent into the treatment chamber 211 from the eluent inlet 215, and desorbing the rare earth ions from the adsorption material by changing the solution environment, thereby eluting the rare earth ions from the adsorption material;

[0070] S6: Re-filtration, the piston rod of the electric push cylinder 242 contracts, driving the partition 241 to move toward the top of the reactor 210. The partition 241 is provided with a filter port 243 for filtering the adsorption material. The partition 241 filters the adsorption material during its movement to separate it from the eluent, so that the adsorption material is retained in the treatment chamber 211, and the eluent carrying the rare earth ions is transported to the purification device 300 for collection;

[0071] S7: Purification, using the purification device 300 to separate the rare earth ions from the eluent and purify the rare earth ions.

[0072] Through fine filtration, adsorption, elution, separation and purification steps, the goal of efficiently recovering rare earth resources from rare earth wastewater is achieved, alleviating the problem of waste of rare earth materials, with significant environmental and economic benefits.

[0073] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0074] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rare earth wastewater treatment line, characterized in that: The invention comprises a primary filtration device (100), a rare earth recovery device (200), a purification device (300) and a neutralization device (400), wherein the primary filtration device (100) is connected to the rare earth recovery device (200), the primary filtration device (100) is used to remove suspended matter and particulate matter in rare earth wastewater, the rare earth recovery device (200) comprises a reaction kettle (210), a stirring component (220), a drainage component (230) and a filtering component (240), wherein the stirring component (220) is used to stir the rare earth wastewater, the drainage component (230) is used to discharge the treated rare earth wastewater, the filtering component (240) is used to separate adsorption materials, the filtering component (240) is used to divide the space in the reaction kettle (210), the filtering component (240) can be raised and lowered, the side of the filtering component (240) close to the top of the reaction kettle (210) is a processing chamber (211), and a side wall of the reaction kettle (210) is provided with a A water inlet (212), a drain outlet (213), an eluent inlet (215) and an eluent outlet (214), the primary filtration device (100) being in communication with the treatment chamber (211) via the water inlet (212), the eluent inlet (215) and the drain outlet (213) both being in communication with the treatment chamber (211), the drain assembly (230) being in communication with the neutralization device (400) via the drain outlet (213), the neutralization device (400) being in communication with the treatment chamber (211) The eluent outlet (214) is located near the bottom of the reactor (210), and the filter assembly (240) can be moved to a side of the eluent outlet (214) near the top of the reactor (210). The purification device (300) is connected to the eluent outlet (214), and the purification device (300) is used to separate rare earth ions from the eluent and purify the rare earth ions; The stirring assembly (220) comprises a driving motor (221), an inner gear ring (222), a planetary disk (223), a sun gear, a plurality of planetary gears and a plurality of stirring rods (224); the planetary disk (223) is connected to the reaction kettle (210); the driving motor (221) is connected to the planetary disk (223) and the driving motor (221) is drivingly connected to the sun gear; the plurality of planetary gears are arranged at intervals along the circumference of the sun gear and the planetary gears are connected to the sun gear. The inner gear ring (222) is sleeved on the outer side of the planetary gear and the planetary gear is meshed with the inner gear ring (222), the inner gear ring (222) is fixedly connected to the planetary disk (223), the planetary gear is connected to the planetary disk (223), a plurality of the planetary gears are arranged in a one-to-one correspondence with a plurality of the stirring rods (224), the stirring rods (224) are coaxially fixedly connected with the corresponding planetary gears, and a spiral blade (225) is arranged on the side wall of the stirring rod (224); The drainage assembly (230) comprises a first drainage pipe (231) and a second drainage pipe (232); the first drainage pipe (231) is coaxially arranged with the sun gear; one end of the first drainage pipe (231) is rotatably connected to the sun gear; a plurality of water filter ports (233) for wastewater to enter are provided on the side wall of the first drainage pipe (231); one end of the second drainage pipe (232) is connected to the first drainage pipe (231); and the other end of the second drainage pipe (232) is connected to the neutralization device (400) through the drainage port (213); The filter assembly (240) comprises a partition (241) and a lifting member, the partition (241) is sealingly and slidably connected to the inner wall of the reaction kettle (210), a plurality of filter ports (243) are provided on the partition (241), and the lifting member is connected to the partition (241), and is used to drive the partition (241) to move along the height direction of the reaction kettle (210); The lifting member comprises an electric push cylinder (242), the electric push cylinder (242) being arranged on the reaction kettle (210), the piston rod of the electric push cylinder (242) being fixedly connected to the planetary disk (223), and the end of the first drain pipe (231) away from the sun gear being fixedly connected to the partition (241).

2. A rare earth wastewater treatment line according to claim 1, characterized in that: The primary filtering device (100) comprises a box (110) and a filter (120); the box (110) is fixedly connected to the reaction kettle (210); an inlet (111) and an outlet (112) are respectively provided on two opposite side walls of the box (110); the outlet (112) is communicated with the water inlet (212); the filter (120) is fixedly connected in the box (110) and is arranged vertically; the filter (120) divides the interior of the box (110) into a first chamber and a second chamber; the inlet (111) is communicated with the first chamber; the outlet (112) is communicated with the second chamber; a waste outlet (113) is provided at the bottom of the box (110); the waste outlet (113) is communicated with the first chamber; and a switch valve for controlling the opening and closing of the waste outlet (113) is connected to the box (110).

3. A rare earth wastewater treatment line according to claim 1, characterized in that: A heat exchange coil (250) is arranged at the bottom of the reaction kettle (210), and the heat exchange coil (250) is used to adjust the temperature of the rare earth wastewater in the reaction kettle (210).

4. A method for recovering rare earth from rare earth wastewater, characterized in that: The recovery method uses the rare earth wastewater treatment line described in any one of claims 1 to 3; the recovery method mainly comprises the following steps: S1: primary filtration, transporting the rare earth wastewater into the primary filtration equipment (100) to filter suspended matter and particulate matter in the rare earth wastewater; S2: Rare earth ion adsorption, transporting the rare earth wastewater after primary filtration to the treatment chamber (211) of the rare earth recovery equipment (200), and using ion exchange resin or zeolite as an adsorption material to adsorb rare earth ions in the rare earth wastewater; S3: secondary filtration, extracting the rare earth wastewater from the treatment chamber (211), so that the adsorption material adsorbed with the rare earth ions remains in the treatment chamber (211); S4: Neutralization, transporting the rare earth wastewater extracted from the treatment chamber (211) into the neutralization device (400) for pH adjustment; S5: eluting, adding an eluent into the treatment chamber (211) to elute the adsorption material adsorbed with the rare earth ions, so as to elute the rare earth ions from the adsorption material; S6: re-filtering to separate the adsorbent from the eluent, so that the adsorbent remains in the treatment chamber (211), and the eluent carrying the rare earth ions is transported to the purification device (300) for collection; S7: Purification, using the purification device (300) to separate the rare earth ions from the eluent and purify the rare earth ions.

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