An apparatus and method for efficient desorption of rhenium-containing solutions from rhenium-absorbing resin.

Abstract

This invention discloses an apparatus and method for efficiently desorbing rhenium-containing solutions from rhenium-absorbing resin. The apparatus includes a primary adsorption tank, a secondary adsorption tank, a tertiary adsorption tank, and a desorption reagent tank. Each adsorption tank is filled with resin. Pure water, nitric acid, ammonium chloride, and ammonium hydroxide are injected into the desorption reagent tank to prepare the desorption reagent. By adding a nitric acid metering tank, an ammonium chloride metering tank, and a pH meter to the desorption apparatus, the concentrations of nitric acid, ammonium chloride, and ammonium hydroxide in the desorption reagent are ensured to be 0.1%, 7%, and 2%, respectively. The prepared desorption reagent is transported to each adsorption tank through a desorption liquid delivery pipeline, thereby desorbing and collecting rhenium ions from the resin. This invention uses a composite desorption reagent that can fully react with the rhenium ions on the resin, improving the rhenium recovery rate. The synergistic effect of 0.1% nitric acid and 7% ammonium chloride significantly enhances the selectivity of the composite reagent for rhenium, improving rhenium purity. It does not damage the resin skeleton, extending the resin's lifespan.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal hydrometallurgical technology, specifically to an apparatus and method for efficiently desorbing rhenium-containing solutions from rhenium-absorbing resins. Background Technology

[0002] Rhenium, a rare and dispersed metal with a high melting point, wear resistance, corrosion resistance, and stable mechanical properties, has important applications in aerospace, petrochemicals, and other fields. Waste acid generated during copper smelting typically contains a certain amount of rhenium. One method for extracting rhenium ions from rhenium-containing solutions such as smelting waste acid and rhenium-containing wastewater involves using a rhenium ion exchange resin to efficiently select and adsorb rhenium ions from the solution, followed by using chemical elution agents to elute the adsorbed rhenium ions from the resin. This facilitates subsequent concentration and crystallization of rhenium, while simultaneously enabling the regeneration of the resin.

[0003] In existing technologies, the removal of rhenium ions from rhenium adsorbent resins uses a single 5% ammonium hydroxide solution as the removal agent. However, this method has the following drawbacks: 1. Poor rhenium selectivity: Ammonium hydroxide alone relies on non-specific ion exchange between OH groups and rhenium ions, failing to distinguish between rhenium ions and impurity anions such as molybdate and tungstate. This results in low rhenium purity in the removal solution, and subsequent evaporation and crystallization require additional impurity removal steps, increasing process complexity and cost. 2. Low removal efficiency: The ionic strength of the 5% ammonium hydroxide solution is relatively weak, resulting in insufficient competitive binding ability with rhenium ions on the adsorbent resin. This necessitates prolonged removal time, leading to low production efficiency and significant waste of reagents and energy. 3. Weak resin adaptability: When the concentration of rhenium ions adsorbed by the adsorbent resin fluctuates (e.g., in low-concentration adsorption scenarios), ammonium hydroxide alone cannot adjust its removal capacity, easily leading to incomplete removal and a rhenium recovery rate that can drop below 80%. 4. Risk of resin damage: Long-term use of a single high-concentration ammonium hydroxide will lead to the degradation of functional groups such as quaternary ammonium salts in rhenium adsorption resin, resulting in a decrease in adsorption capacity, a shortened resin lifespan, and increased equipment operation and maintenance costs.

[0004] Therefore, it can be seen that the existing methods for desorbing rhenium-absorbing resin have the disadvantages of poor rhenium selectivity, low desorption efficiency, incomplete desorption, and damage to the resin. Summary of the Invention

[0005] Therefore, the present invention provides an apparatus and method for efficiently resolving a solution containing rhenium ions from a rhenium-absorbing resin, thereby solving the problems mentioned in the background art, such as low resolving efficiency, poor rhenium selectivity, incomplete resolving, and resin damage in current resolving apparatuses and methods for rhenium-absorbing resins.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin includes a desorption tank and a series-connected primary adsorption tank, a secondary adsorption tank, and a tertiary adsorption tank. The desorption tank is equipped with a stirrer, and each adsorption tank is filled with resin and has a flow guiding structure. The top of the desorption tank has an inlet for nitric acid, an inlet for ammonium chloride, an inlet for ammonium hydroxide, and an inlet for pure water. The nitric acid, ammonium chloride, and pure water inlets are connected to a nitric acid supply source, an ammonium chloride supply source, and a pure water supply source, respectively, via pipes. A nitric acid metering tank is installed on the pipe connecting the desorption tank to the nitric acid supply source. An ammonium chloride metering tank is installed on the pipeline connected to the source; the bottom of the desorption tank has an outlet, which is connected to the first-stage adsorption tank, the second-stage adsorption tank, and the third-stage adsorption tank respectively through the desorption liquid delivery pipeline; a desorption liquid delivery pump is installed at the connection between the outlet and the desorption liquid delivery pipeline; a pH meter and a desorption liquid inlet valve are installed on the desorption liquid delivery pipeline; a reflux pipe is provided between the desorption tank and the desorption liquid delivery pipeline; a valve is installed on the reflux pipe; one end of the reflux pipe is connected to the top of the desorption tank, and the other end is connected between the pH meter and the desorption liquid inlet valve; each adsorption tank is connected to a collection tank through a pipeline.

[0008] Furthermore, the apparatus for analyzing and adsorbing rhenium resin also includes a raw liquid tank, which is connected to the primary adsorption tank via a raw liquid delivery pipeline. A raw liquid delivery pump is installed on the raw liquid delivery pipeline, and a wastewater discharge pipeline is installed outside the tertiary adsorption tank. A valve is installed on the wastewater discharge pipeline.

[0009] Furthermore, the apparatus for analyzing rhenium resin also includes a rinsing liquid tank, which is connected to the primary adsorption tank, the secondary adsorption tank, and the tertiary adsorption tank respectively via rinsing liquid delivery pipelines. The rinsing liquid delivery pipelines are equipped with a rinsing liquid delivery pump and a rinsing liquid inlet valve.

[0010] Each of the adsorption boxes has a reagent discharge pipe at the bottom and a rinsing liquid discharge pipe at the top, and both the reagent discharge pipe and the rinsing liquid discharge pipe are equipped with control valves.

[0011] Each of the adsorption boxes is connected to a solid-liquid separation box at its outlet, and a separation cloth bag is installed inside the solid-liquid separation box.

[0012] Furthermore, the present invention also provides a method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin, comprising the following steps:

[0013] S1. Fill the resin into each of the adsorption tanks, turn on the raw liquid delivery pump, and deliver the raw liquid in the raw liquid tank to each of the adsorption tanks; after adsorption is completed, discharge the remaining solution through the sewage discharge pipeline.

[0014] S2. Preparation of the desorption reagent: Add pure water to the desorption reagent tank and turn on the built-in stirrer, which rotates at a preset speed n; add industrial-grade nitric acid and industrial-grade solid ammonium chloride to the desorption reagent tank in sequence, and monitor and control the volume and flow rate of industrial-grade nitric acid and industrial-grade ammonium chloride in the desorption reagent tank through the nitric acid metering tank and the ammonium chloride metering tank; then slowly inject industrial-grade ammonium hydroxide into the desorption reagent tank, while starting the desorption liquid delivery pump and opening the valve on the return pipe, and monitor the pH in real time with a pH meter. When the pH stabilizes at 8.0-8.5, stop injecting industrial-grade ammonium hydroxide. At this time, the desorption reagent tank contains 0.1% nitric acid + 7% ammonium chloride + 2% ammonium hydroxide, completing the preparation of the composite desorption reagent;

[0015] S3. Close the valve on the reflux pipe, open the inlet valve of the desorption liquid, and transport the desorption reagent in the desorption reagent tank to each adsorption tank through the desorption liquid delivery pipeline at a preset flow rate V1 and a preset time T1. The preset time T1 is 3-4 hours, to desorb rhenium ions from the resin; collect the desorbed rhenium-containing desorption liquid to complete the entire desorption process.

[0016] The preset flow rate V1 is 4-5 meters per hour; after collecting the rhenium-containing effluent, the control valve on the reagent discharge pipeline at the bottom of each adsorption device is opened to drain the remaining rhenium-containing effluent and transport it to a dedicated processing system.

[0017] Further, after draining the residual rhenium-containing desorption solution from each adsorption tank, the rinsing solution delivery pump is started, the rinsing solution inlet valve is opened, and pure water in the rinsing solution tank is delivered to each adsorption tank through the rinsing solution delivery pipeline. The adsorption tanks are rinsed according to a preset flow rate V2 and a preset time T2. The preset flow rate V2 is 15 m / h, and the preset time T2 is 20 min. After rinsing, the rinsing solution outlet pipeline at the top of each adsorption device is opened to discharge the rinsed liquid and remove residual reagents and impurities from the adsorption tank.

[0018] Furthermore, the control valves on the reagent discharge pipelines at the bottom of each adsorption unit are opened again to drain the residual liquid in each adsorption tank for a second time and transport it to a dedicated treatment system.

[0019] Furthermore, the outlet of each adsorption tank is opened, and the resin falls into the separation bag of the solid-liquid separation tank corresponding to each adsorption tank. The filtrate flows back to the original liquid tank through the pipeline.

[0020] This invention has the following advantages: The invention provides an apparatus and method for efficiently desorbing rhenium-containing ion solutions from rhenium-absorbing resin, comprising a primary adsorption tank, a secondary adsorption tank, a tertiary adsorption tank, and a desorption reagent tank. Each adsorption tank is filled with resin. Nitric acid, ammonium chloride, ammonium hydroxide, and pure water are injected into the desorption reagent tank. By adding a nitric acid metering tank, an ammonium chloride metering tank, and a pH meter to the desorption apparatus, the concentrations of nitric acid, ammonium chloride, and ammonium hydroxide are controlled to be 0.1%, 7%, and 2% respectively when injected into the desorption reagent tank. A desorption reagent composed of 0.1% nitric acid + 7% ammonium chloride + 2% ammonium hydroxide is used instead of a single 5% ammonium hydroxide solution and transported to each adsorption tank. The 7% ammonium chloride provides a high concentration of Cl... — Its affinity for rhenium ions is much higher than its affinity for molybdate and tungstate ions, allowing it to preferentially compete with rhenium ions for resin adsorption sites; 0.1% nitric acid provides a low concentration of H₂. + This process only disrupts the electrostatic bond between rhenium ions and the resin, without affecting the bonding stability of impurity ions with the resin. The synergistic effect of both significantly improves the selectivity of the composite reagent for rhenium, achieving a rhenium purity of over 95% in the eluent. Subsequent evaporation and crystallization do not require additional impurity removal, reducing process costs and complexity. — High competitiveness and H + The combined effect of the compound reagent and ammonium hydroxide accelerates the desorption rate of rhenium ions, reducing the single-cycle desorption time to 3-4 hours and increasing efficiency by more than 50%. The composite reagent has a higher ionic strength than ammonium hydroxide alone, allowing for a thorough reaction with rhenium ions on the resin, increasing rhenium recovery to over 92% and reducing resource waste. 2% ammonium hydroxide replaces 5% high-concentration ammonia, reducing the corrosive effect of the alkaline environment on the resin functional groups; 0.1% low-concentration nitric acid only disrupts the rhenium ion bonds without damaging the resin skeleton. Together, these two agents extend the resin's lifespan to 25-30 cycles, reducing resin replacement costs and maintenance workload. The compound reagent contains Cl... — The concentration can be flexibly adjusted through the metering tank. For low-concentration rhenium adsorption scenarios, the ammonium chloride concentration can be finely adjusted (±0.5%) to ensure thorough desorption. The pH is kept stable at 8.0-8.5 to avoid changes in resin adsorption performance due to concentration fluctuations. It has stronger process adaptability and is suitable for adsorption systems with different rhenium concentrations.

[0021] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 A schematic diagram of a device for efficiently desorbing a solution containing rhenium ions from a rhenium adsorption resin, provided in an embodiment of the present invention;

[0025] Figure 2 This is a flowchart illustrating a method for efficiently resolving a solution containing rhenium ions from a rhenium-absorbing resin, as provided in an embodiment of the present invention.

[0026] In the diagram: 1. Stock solution tank; 2. Desorption tank; 3. Rinse solution tank; 4. Stock solution transfer pump; 5. Desorption solution transfer pump; 6. Rinse solution transfer pump; 7. Desorption solution transfer pipeline; 8. Stock solution transfer pipeline; 9. Rinse solution transfer pipeline; 10. Reagent discharge pipeline; 11. Rinse solution discharge pipeline; 12. Desorption solution inlet valve; 13. Collection tank; 14. Solid-liquid separation tank; 15. Rinse solution inlet valve; 16. Wastewater discharge pipeline; 17. Return pipe; 30. Primary adsorption tank; 31. Secondary adsorption tank; 32. Tertiary adsorption tank; 41. Nitric acid metering tank; 42. Ammonium chloride metering tank; 43. pH meter. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] As shown in Figure 1, this embodiment provides an apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium adsorption resin. The apparatus includes a desorption reagent tank 2 and a series of adsorption tanks 30, 31, and 32. The desorption reagent tank 2 is used to prepare and store the desorption reagent. Each adsorption tank is filled with resin for desorbing rhenium ions.

[0030] The top of the analytical reagent tank 2 is equipped with nitric acid inlet, ammonium chloride inlet, ammonium hydroxide inlet, and pure water inlet, which are respectively connected to the nitric acid supply source, ammonium chloride supply source, and pure water supply source through pipelines. A nitric acid metering tank 41 is installed on the pipeline connecting the analytical reagent tank 2 to the nitric acid supply source to monitor and control the volume and flow rate of nitric acid in the analytical reagent. An ammonium chloride metering tank 42 is installed on the pipeline connecting the analytical reagent tank 2 to the ammonium chloride supply source to monitor and control the volume and flow rate of ammonium chloride in the analytical reagent.

[0031] The bottom of the desorption tank 2 is provided with a liquid outlet, which is connected to the first-stage adsorption tank 30, the second-stage adsorption tank 31, and the third-stage adsorption tank 32 through the desorption liquid delivery pipe 7. A desorption liquid delivery pump 5 is provided at the connection between the liquid outlet and the desorption liquid delivery pipe 7. By starting the desorption liquid delivery pump 5, the desorption reagent in the desorption tank 2 can be delivered to each adsorption tank.

[0032] A pH meter 43 and a liquid inlet valve 12 are installed on the liquid delivery pipeline 7. The pH meter 43 is used to detect the pH value of the liquid desorption agent, and the liquid inlet valve 12 is used to control the liquid desorption agent to flow smoothly to each adsorption tank and prevent the liquid desorption agent from flowing backward.

[0033] A return pipe 17 is provided between the analytical reagent tank 2 and the analytical solution delivery pipeline 7. A valve is provided on the return pipe 17. One end of the return pipe 17 is connected to the top of the analytical reagent tank 2, and the other end is connected between the pH detector 43 and the analytical solution inlet valve 12. When ammonium hydroxide is injected into the analytical reagent tank 2, the analytical solution delivery pump 5 is started and the valve on the return pipe 17 is opened, so that the analytical solution can circulate between the analytical reagent tank 2 and the analytical solution delivery pipeline 7 and flow through the pH detector 43, thereby realizing the detection of the pH value of the analytical solution by the pH detector 43.

[0034] Each adsorption tank is connected to a collection tank 13 via a pipeline, which is used to collect the rhenium-containing precipitate for subsequent concentration and crystallization.

[0035] Each adsorption tank is equipped with a reagent discharge pipe 10 at the bottom, and a control valve is installed on the reagent discharge pipe 10 to drain the residual rhenium-containing desorption solution in the adsorption tank.

[0036] The analytical reagent tank 2 is equipped with a stirrer to fully mix and dissolve the solution in the analytical reagent tank 2, so as to ensure the analytical effect of the analytical reagent.

[0037] Each adsorption tank is equipped with a flow guiding structure, which guides the flow path of the liquid entering the adsorption tank, optimizes the flow state, and improves the conveying efficiency.

[0038] This embodiment provides an apparatus for efficiently desorbing rhenium-containing solutions from rhenium-absorbing resin. It further includes a raw solution tank 1, which is connected to a primary adsorption tank 30 via a raw solution delivery pipeline 8. A raw solution delivery pump 4 is installed on the raw solution delivery pipeline 8. By activating the raw solution delivery pump 4, the raw solution (rhenium-containing solutions such as smelting waste acid and rhenium-containing wastewater) in the raw solution tank 1 can be sequentially delivered to each adsorption tank, allowing the resin to selectively adsorb rhenium-containing ions first, facilitating further desorption.

[0039] A wastewater discharge pipe 16 is installed outside the three-stage adsorption tank. A valve is installed on the wastewater discharge pipe 16 to discharge the original liquid after resin adsorption.

[0040] This embodiment provides an apparatus for efficiently desorbing rhenium-containing ion solutions from rhenium-absorbing resin. It also includes a rinsing liquid tank 3, which is connected to the bottoms of a primary adsorption tank 30, a secondary adsorption tank 31, and a tertiary adsorption tank 32 via rinsing liquid delivery pipelines 9. A rinsing liquid delivery pump 6 and a rinsing liquid inlet valve 15 are installed on the rinsing liquid delivery pipelines 9. After the rhenium-containing desorbed solution in each adsorption tank is collected and drained, the pure water in the rinsing liquid tank 3 can be delivered to each adsorption tank by activating the rinsing liquid delivery pump 6 and the rinsing liquid inlet valve 15, thereby rinsing the adsorption tanks.

[0041] Each adsorption tank is equipped with a flushing liquid discharge pipe 11 at the top. A control valve is installed on the flushing liquid discharge pipe 11. When flushing the adsorption tank, the control valve is opened to smoothly discharge the continuously entering flushing liquid. After flushing is completed, the control valve is closed. The liquid remaining in the adsorption tank can be drained through the reagent discharge pipe 10.

[0042] A solid-liquid separation tank 14 is connected to the discharge port of each adsorption tank. The solid-liquid separation tank 14 is equipped with a separation filter bag, which facilitates resin replacement and separates the solid resin and filtrate for more environmentally friendly processing.

[0043] Example 2

[0044] As shown in Figure 2, this embodiment provides a method for efficiently resolving a solution containing rhenium ions from a rhenium-absorbing resin, comprising the following steps:

[0045] S1, Adsorption:

[0046] Resin is filled into each adsorption tank. The raw liquid transfer pump 4 is turned on to transfer the raw liquid in the raw liquid tank 1 to the adsorption tanks connected in series to form multi-stage adsorption. After adsorption is completed, the valve on the sewage discharge pipe 16 is opened to discharge the remaining raw liquid through the sewage discharge pipe 16.

[0047] S2. Preparation of the analytical reagent:

[0048] Add pure water to the analytical reagent tank 2, and turn on the stirrer inside the analytical reagent tank 2. The stirrer rotates at a preset speed n, preferably 200-300 r / min. Add 68% industrial-grade nitric acid and industrial-grade solid ammonium chloride to the analytical reagent tank 2 sequentially. Monitor and control the volume and flow rate of the industrial-grade nitric acid and industrial-grade ammonium chloride in the analytical reagent tank 2 through nitric acid metering tank 41 and ammonium chloride metering tank 42. Based on the concentration of nitric acid and the liquid level data measured by nitric acid metering tank 41, stop adding nitric acid when the concentration reaches 0.1% (for example, if 2 m³ of 0.1% nitric acid is configured, and the on-site nitric acid metering tank is set to 5%, the metering pump will operate...). Add 0.04 m³ of nitric acid to the preparation tank, while simultaneously controlling the running time of the metering pump and the liquid level in the metering tank; calculate the concentration of ammonium chloride based on the weight and volume data measured in the ammonium chloride metering tank, and stop adding ammonium chloride when it reaches 7% (concentration = g / L); then slowly inject industrial-grade ammonium hydroxide into the desorption tank 2, while simultaneously starting the desorption liquid transfer pump 5 and opening the valve on the return pipe 17, and monitor the pH in real time using the pH meter 43. When the pH stabilizes at 8.0-8.5, stop injecting industrial-grade ammonium hydroxide. Finally, the desorption tank 2 contains 0.1% nitric acid + 7% ammonium chloride + 2% ammonium hydroxide, thus completing the preparation of the composite desorption reagent;

[0049] S3, Explanation:

[0050] Close the valve on the reflux pipe 17, open the desorption liquid inlet valve 12, and transport the desorption reagent in the desorption reagent tank 2 to each adsorption tank through the desorption liquid delivery pipe 7 at a preset flow rate V1 and a preset time T1. Preferably, the preset flow rate V1 is 4-5 m / h and the preset time T1 is 3-4 hours, which desorbs rhenium ions from the resin (the flow rate varies depending on the diameter of the desorption liquid delivery pipe 7, and is determined by the amount of resin in each adsorption tank). Collect the desorbed rhenium-containing desorption liquid to complete the entire desorption process.

[0051] S4, Emptying:

[0052] After collecting the rhenium-containing eluent, open the control valve on the reagent discharge pipeline 10 at the bottom of each adsorption unit to drain the remaining rhenium-containing eluent and transport it to a dedicated treatment system.

[0053] S5, Rinse:

[0054] After draining the residual rhenium-containing desorption solution from each adsorption tank, start the rinsing solution delivery pump 6, open the rinsing solution inlet valve 15, and deliver the pure water in the rinsing solution tank 3 to each adsorption tank through the rinsing solution delivery pipeline 9. At the same time, open the control valve on the rinsing solution outlet pipeline 11 to discharge the rinsed liquid and remove the residual reagents and impurities in the adsorption tank. Rinse the adsorption tank according to the preset flow rate V2 and preset time T2. Preferably, the preset flow rate V2 is 15 m / h and the preset time T2 is 20 min. After rinsing is completed, close the control valve on the rinsing solution outlet pipeline 11.

[0055] S6, Secondary evacuation:

[0056] Open the control valve on the reagent discharge pipeline 10 at the bottom of each adsorption unit again to drain the residual liquid in each adsorption tank for a second time and transport it to the special treatment system.

[0057] S7. Solid-liquid separation and recovery:

[0058] If the resin needs to be replaced, the outlet of each adsorption tank can be opened, and the resin falls into the solid-liquid separation tank 14 corresponding to each adsorption tank. The resin is collected by the separation bag in the solid-liquid separation tank 14 and processed as needed. The filtrate can be returned to the original liquid tank 1 through the pipeline.

[0059] Optionally, the nitric acid added to the desorption reagent tank 2 in step S2 can be replaced with sulfuric acid, and the ammonium chloride can be replaced with potassium chloride. The concentration of sulfuric acid in the composite desorption reagent is 0.08%-0.12%, and the concentration of potassium chloride is 7%-7.5%; the same desorption effect can be achieved.

[0060] Optionally, the nitric acid metering tank and ammonium chloride metering tank in step S2 can be replaced with a liquid / solid feeding device with a flow meter to suit different production scale equipment configurations.

[0061] Optionally, the stirrer inside the medicine tank 2 in step S2 can be replaced with an external circulating stirring pipeline, which can also achieve uniform mixing of all components and reduce the difficulty of modifying the medicine tank.

[0062] Optionally, the pH value of the compounded desorption reagent in step S2 can be adjusted within the range of 7.8-8.7. A slightly lower pH (7.8-8.0) is suitable for strongly alkaline resistant resins, and a slightly higher pH (8.5-8.7) is suitable for weakly alkaline resistant resins, without affecting rhenium selectivity and desorption efficiency.

[0063] Optionally, the preset flow rate V1 in step S3 can be adjusted within the range of 3.5-5.5 m / h. Reducing the flow rate can prolong the contact time between the reagent and the resin, while increasing the flow rate can shorten the desorption time.

[0064] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A device for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin, characterized in that, The system includes a desorption tank (2) and a series of adsorption tanks: a primary adsorption tank (30), a secondary adsorption tank (31), and a tertiary adsorption tank (32). The desorption tank (2) is equipped with a stirrer, the adsorption tanks are filled with resin, and the adsorption tanks have a flow guiding structure. The top of the desorption tank (2) has an inlet for nitric acid, an inlet for ammonium chloride, an inlet for ammonium hydroxide, and an inlet for pure water. The nitric acid, ammonium chloride, and pure water inlets are connected to the nitric acid supply source, the ammonium chloride supply source, and the pure water supply source, respectively, via pipes. A nitric acid metering tank (41) is installed on the pipe connecting the desorption tank (2) to the nitric acid supply source, and an ammonium chloride metering tank (42) is installed on the pipe connecting the desorption tank (2) to the ammonium chloride supply source. The bottom of the desorption tank (2)... The unit is provided with an outlet, which is connected to the first-stage adsorption tank (30), the second-stage adsorption tank (31), and the third-stage adsorption tank (32) respectively through the desorption liquid delivery pipe (7). A desorption liquid delivery pump (5) is provided at the connection between the outlet and the desorption liquid delivery pipe (7). A pH meter (43) and a desorption liquid inlet valve (12) are provided on the desorption liquid delivery pipe (7). A return pipe (17) is provided between the desorption tank (2) and the desorption liquid delivery pipe (7). A valve is provided on the return pipe (17). One end of the return pipe (17) is connected to the top of the desorption tank (2), and the other end is connected between the pH meter (43) and the desorption liquid inlet valve (12). Each adsorption tank is connected to a collection box (13) through a pipe.

2. The apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 1, characterized in that, It also includes a raw liquid tank (1), which is connected to the first-stage adsorption tank (30) through a raw liquid delivery pipeline (8). A raw liquid delivery pump (4) is installed on the raw liquid delivery pipeline (8). A sewage discharge pipeline (16) is installed outside the third-stage adsorption tank (32), and a valve is installed on the sewage discharge pipeline (16).

3. The apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 1, characterized in that, It also includes a flushing liquid tank (3), which is connected to the first-stage adsorption tank (30), the second-stage adsorption tank (31) and the third-stage adsorption tank (32) respectively through a flushing liquid delivery pipeline (9). The flushing liquid delivery pipeline (9) is equipped with a flushing liquid delivery pump (6) and a flushing liquid inlet valve (15).

4. The apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 1, characterized in that, Each adsorption box is equipped with a drug discharge pipe (10) at the bottom and a rinsing liquid discharge pipe (11) at the top. Both the drug discharge pipe (10) and the rinsing liquid discharge pipe (11) are equipped with control valves.

5. The apparatus for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 1, characterized in that, A solid-liquid separation box (14) is connected to the outlet of each adsorption box, and a separation cloth bag is installed inside the solid-liquid separation box (14).

6. A method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin using the apparatus described in claims 1-5, characterized in that, Includes the following steps: S1. Fill the resin into each of the adsorption tanks and turn on the original liquid delivery pump (4) to deliver the original liquid in the original liquid tank (1) to each of the adsorption tanks. After adsorption is complete, the remaining solution is discharged through the sewage discharge pipe (16); S2. Preparation of the desorption reagent: Add pure water to the desorption reagent tank (2), turn on the built-in stirrer, and the stirrer rotates at a preset speed n; add industrial-grade nitric acid and industrial-grade solid ammonium chloride to the desorption reagent tank (2) one after the other, and monitor and control the volume and flow rate of industrial-grade nitric acid and industrial-grade ammonium chloride in the desorption reagent tank (2) through the nitric acid metering tank (41) and the ammonium chloride metering tank (42); then slowly inject industrial-grade ammonium hydroxide into the desorption reagent tank (2), and at the same time start the desorption liquid delivery pump (5), open the valve on the return pipe (17), and detect it in real time through the pH detector (43). When the pH stabilizes at 8.0-8.5, stop injecting industrial-grade ammonium hydroxide. At this time, the desorption reagent tank (2) contains 0.1% nitric acid + 7% ammonium chloride + 2% ammonium hydroxide, and the preparation of the composite desorption reagent is completed. S3. Close the valve on the reflux pipe (17), open the liquid inlet valve (12), and transport the desorption agent in the desorption tank (2) to each adsorption tank through the desorption liquid delivery pipe (7) at a preset flow rate V1 and a preset time T1. The preset time T1 is 3-4 hours, and desorb rhenium ions from the resin. Collect the desorbed rhenium-containing desorption liquid to complete the entire desorption process.

7. The method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 6, characterized in that, The preset flow rate V1 is 4-5 m / h; after collecting the rhenium-containing effluent, open the control valve on the reagent discharge pipeline (10) at the bottom of each adsorption device to drain the remaining rhenium-containing effluent and transport it to the special treatment system.

8. The method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 7, characterized in that, After draining the residual rhenium-containing analyte from each adsorption tank, start the rinsing liquid delivery pump (6), open the rinsing liquid inlet valve (15), and deliver the pure water in the rinsing liquid tank (3) to each adsorption tank through the rinsing liquid delivery pipeline (9). Rinse the adsorption tanks according to the preset flow rate V2 and the preset time T2. The preset flow rate V2 is 15 m / h and the preset time T2 is 20 min. After rinsing, open the rinsing liquid discharge pipe (11) at the top of each adsorption unit to discharge the rinsed liquid and remove residual reagents and impurities from the adsorption box.

9. A method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 8, characterized in that, Open the control valve on the reagent discharge pipe (10) at the bottom of each adsorption unit again to drain the residual liquid in each adsorption tank for a second time and transport it to the special treatment system.

10. The method for efficiently desorbing a solution containing rhenium ions from a rhenium-absorbing resin according to claim 9, characterized in that, Open the outlet (24) of each adsorption box, and the resin falls into the separation bag of the solid-liquid separation box (14) corresponding to each adsorption box. The filtrate flows back to the original liquid tank (1) through the pipeline.

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