A rare earth extraction organic solvent dehydration system

Abstract

The utility model discloses a rare earth extraction organic solvent dehydration system, including aqueous organic solvent storage tank, pretreatment filter, oil -water separator and dehydration organic solvent storage tank, the outlet of aqueous organic solvent storage tank is connected with the import of pretreatment filter through pretreatment filter liquid inlet pipe, the outlet of pretreatment filter is connected with the import of oil -water separator through oil -water separator liquid inlet pipe, the outlet of oil -water separator is connected with the import of dehydration organic solvent storage tank through dehydration organic solvent storage tank liquid inlet pipe, the bottom of oil -water separator is connected with drain pipe, the bottom of dehydration organic solvent storage tank is connected with dehydration organic solvent storage tank liquid outlet pipe, the utility model discloses stable operation, and the operation continuity is good, can with the water content of dehydration organic solvent control below 1%, dehydration efficiency is high, and dehydration effect is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of rare earth extraction technology, and in particular to a rare earth extraction organic solvent dehydration system. Background Technology

[0002] Rare earth extraction and separation technology is one of the key technologies for the purification and separation of rare earth elements. It is based on the difference in the partition ratio of substances in two immiscible phases (such as an organic solvent and an aqueous phase), and achieves the separation and purification of rare earth elements through methods such as solvent extraction. Solvent extraction is the core step of the rare earth extraction and separation process. It utilizes organic solvents to extract rare earth elements from aqueous solutions, achieving further separation and purification. The solvent extraction process typically includes steps such as extraction, washing, and back-extraction. In the extraction stage, rare earth elements are transferred from the aqueous phase to the organic solvent; in the washing stage, impurities in the organic solvent are removed by washing; in the back-extraction stage, a back-extraction agent is used to transfer the rare earth elements back from the organic solvent to the aqueous phase, yielding a purified rare earth solution.

[0003] Organic solvents commonly exhibit emulsification and water content, resulting in high water content and affecting subsequent back-extraction. Currently, sedimentation / clarification tanks are used at both ends to separate the emulsified water from the organic solvents. However, the separation efficiency is low, and the actual separation effect is not ideal. This is mainly because the emulsified water carried by the organic solvents is relatively stable, and achieving natural sedimentation separation takes a long time. Utility Model Content

[0004] This invention aims to solve the problem that existing technologies, which separate emulsion water from organic solvents by setting sedimentation tanks / clarification tanks at both the front and rear ends, have unsatisfactory separation effects and low separation efficiency. It provides a rare earth extraction organic solvent dehydration system with good continuity, high dehydration efficiency, and significant dehydration effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A rare earth extraction organic solvent dehydration system of the present invention includes an aqueous organic solvent storage tank, a pretreatment filter, an oil-water separator, and a dehydrated organic solvent storage tank; the outlet of the aqueous organic solvent storage tank is connected to the inlet of the pretreatment filter through a pretreatment filter inlet pipe; the outlet of the pretreatment filter is connected to the inlet of the oil-water separator through an oil-water separator inlet pipe; the outlet of the oil-water separator is connected to the inlet of the dehydrated organic solvent storage tank through a dehydrated organic solvent storage tank inlet pipe; a drain pipe is connected to the bottom of the oil-water separator; and a dehydrated organic solvent storage tank outlet pipe is connected to the bottom of the dehydrated organic solvent storage tank. The main equipment of this invention consists of a pretreatment filter and an oil-water separator. To ensure the continuity of the dehydration process, the front-end extraction process, and the back-end reverse extraction process, auxiliary equipment, including an aqueous organic solvent storage tank and a dehydrated organic solvent storage tank, are also included. All equipment in this invention is existing. The aqueous organic solvent passes through the pretreatment filter in an inward-to-outward manner, where suspended solids, large particles, and other impurities are intercepted and removed. The aqueous organic solvent filtered by the pretreatment filter then enters the oil-water separator in an inward-to-outward manner. Using fiber membrane oil-water separation technology, the emulsified... Aqueous organic solvents pass through a fiber membrane filter element via an inward-to-outward flow. Due to the surface properties of the fiber membrane material, the dispersed water and the vast majority of emulsified water in the aqueous organic solvent are demulsified and aggregated. This coarsens the water particles in the organic extractant as the aqueous organic solvent detaches from the filter element surface. After detaching from the filter element, the aqueous phase undergoes oil-water separation under buoyancy, significantly reducing the water content of the organic solvent discharged from the oil-water separator. The organic solvent then enters the outlet pipe of the dehydrated organic solvent storage tank for storage. This invention is automatically operated via a PLC control system, a conventional technique in this field.

[0006] Preferably, the oil-water separator inlet pipe is equipped with an oil-water separator inlet shut-off valve, and the drain pipe is equipped with an oil-water separator drain shut-off valve.

[0007] Preferably, the system also includes a backwash liquid storage tank. A compressed gas pipe is connected in parallel to the inlet pipe of the dehydrated organic solvent storage tank. An oil-water separator outlet shut-off valve is installed on the inlet pipe of the dehydrated organic solvent storage tank. A backwash inlet shut-off valve is installed on the compressed gas pipe. An exhaust pipe is connected in parallel to the compressed gas pipe. The inlet of the backwash liquid storage tank is connected to the inlet pipe of the oil-water separator through a backwash drain pipe. The backwash drain pipe is connected to the exhaust pipe. A backwash drain shut-off valve is installed on the backwash drain pipe. An exhaust shut-off valve is installed on the exhaust pipe. To address the problem of filter element clogging in oil-water separators, this invention adds a compressed gas pipe and a backwash liquid storage tank. When the pressure difference between the oil and water separator reaches a set value or according to the backwash time designed by the PLC control system, backwashing of the filter element inside the oil-water separator begins. Before backwashing, the PLC control system discharges the water separated at the bottom of the oil-water separator through the drain pipe. After drainage, the PLC control system simultaneously shuts off the oil-water separator inlet and outlet valves and opens the backwash inlet valve to pressurize the oil-water separator. When the pressure reaches the set backwash pressure, a pulse opens the backwash discharge valve. Using the compressed gas inside the oil-water separator as the driving force, the dehydrated organic extractant inside the oil-water separator is used to quickly flush the dehydrated filter element of the oil-water separator in an external-in, internal-out manner. The backwash discharge is discharged into the backwash liquid storage tank and then into the water-containing organic solvent storage tank for circulation. After backwashing several times, stop backwashing, adjust the corresponding valve switch status, and control the system to automatically run the dehydration system injection program. When the organic solvent inside the oil-water separator is full, the system automatically resumes normal operation.

[0008] Preferably, the oil-water separator is equipped with a low-level oil-water interface detector and a high-level oil-water interface detector on its outer side. The low-level oil-water interface detector and the high-level oil-water interface detector are used to detect the liquid levels of water and organic solvent, respectively. When the water in the oil-water separator reaches the low-level oil-water interface detector, the PLC control system receives a signal and controls the drain shut-off valve of the oil-water separator to open for drainage. When the organic solvent in the oil-water separator reaches the high-low oil-water interface detector, the PLC control system receives a signal and controls the liquid outlet shut-off valve of the oil-water separator to open, allowing the organic solvent to be discharged into the dehydrated organic solvent storage tank.

[0009] Preferably, the pretreatment filter inlet pipe is equipped with a delivery pump, a flow regulating valve and a flow meter.

[0010] Preferably, the pretreatment filter inlet pipe is equipped with a pretreatment filter inlet pressure gauge.

[0011] Preferably, the oil-water separator inlet pipe is equipped with an oil-water separator inlet pressure gauge.

[0012] Preferably, the inlet pipe of the dehydrated organic solvent storage tank is equipped with an oil-water separator outlet pressure gauge.

[0013] Therefore, this utility model has the following beneficial effects: by connecting the pretreatment filter and the oil-water separator in series, it can achieve the interception and removal of impurities such as suspended solids in water-containing organic solvents and the rapid and efficient separation of emulsified water in organic solvents. It can control the water content of dehydrated organic solvents to below 1%, with high dehydration efficiency and significant dehydration effect. Attached Figure Description

[0014] Figure 1 This is a connection diagram of this utility model.

[0015] In the diagram: 1. Aqueous organic solvent storage tank; 2. Pretreatment filter; 3. Oil-water separator; 4. Dehydrated organic solvent storage tank; 5. Pretreatment filter inlet pipe; 6. Oil-water separator inlet pipe; 7. Dehydrated organic solvent storage tank inlet pipe; 8. Drain pipe; 9. Dehydrated organic solvent storage tank outlet pipe; 10. Oil-water separator inlet shut-off valve; 11. Oil-water separator drain shut-off valve; 12. Backwash liquid storage tank; 13. Compressed gas pipe; 14. Oil-water separator outlet shut-off valve; 15. Backwash inlet shut-off valve; 16. Exhaust pipe; 17. Backwash drain pipe; 18. Backwash drain shut-off valve; 19. Exhaust shut-off valve; 20. Low-level oil-water interface detector; 21. High-level oil-water interface detector; 22. Transfer pump; 23. Flow regulating valve; 24. Flow meter; 25. Pretreatment filter inlet pressure gauge; 26. Oil-water separator inlet pressure gauge; 27. Oil-water separator outlet pressure gauge. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1The rare earth extraction organic solvent dehydration system shown includes an aqueous organic solvent storage tank 1, a pretreatment filter 2, an oil-water separator 3, a dehydrated organic solvent storage tank 4, and a backwash liquid storage tank 12. The outlet of the aqueous organic solvent storage tank is connected to the inlet of the pretreatment filter via a pretreatment filter inlet pipe 5. A transfer pump 22, a flow regulating valve 23, a flow meter 24, and a pretreatment filter inlet pressure gauge 25 are connected to the pretreatment filter inlet pipe. A low-level oil-water interface detector 20 and a high-level oil-water interface detector 21 are installed on the outside of the oil-water separator. The outlet of the pretreatment filter is connected to the inlet of the oil-water separator via an oil-water separator inlet pipe 6. An oil-water separator inlet shut-off valve 10 and an oil-water separator inlet pressure gauge 26 are installed on the oil-water separator inlet pipe. The inlet of the backwash liquid storage tank is connected to the oil-water separator inlet. The separator inlet pipe is connected to the backwash drain pipe 17, which is connected to the exhaust pipe. The backwash drain pipe is equipped with a backwash drain shut-off valve 18. The outlet of the oil-water separator is connected to the inlet of the dehydrated organic solvent storage tank via the dehydrated organic solvent storage tank inlet pipe 7. The dehydrated organic solvent storage tank inlet pipe is equipped with an oil-water separator outlet shut-off valve 14 and an oil-water separator outlet pressure gauge 27. The dehydrated organic solvent storage tank inlet pipe is also connected in parallel with a compressed gas pipe 13, which is equipped with a backwash inlet shut-off valve 15. The compressed gas pipe is also connected in parallel with an exhaust pipe 16, which is equipped with an exhaust shut-off valve 19. The bottom of the oil-water separator is connected to a drain pipe 8, which is equipped with an oil-water separator drain shut-off valve 11. The bottom of the dehydrated organic solvent storage tank is connected to a dehydrated organic solvent storage tank outlet pipe 9.

[0018] The operating principle of this utility model is as follows: During initial operation, liquid needs to be injected into the pretreatment filter and oil-water separator. During injection, the PLC control system controls the opening of the exhaust shut-off valve, the opening of the oil-water separator inlet shut-off valve, the closing of the oil-water separator outlet shut-off valve, the closing of the backwash air inlet shut-off valve, the closing of the oil-water separator drain shut-off valve, and the closing of the backwash drain shut-off valve. The delivery pump is started and the flow valve is adjusted, allowing the water-containing organic solvent in the storage tank to pass through the pretreatment filter and oil-water separator. The water-containing organic solvent first passes through the pretreatment filter, and then passes through the oil-water separator for oil-water separation. When the organic solvent in the oil-water separator reaches the high-level oil-water interface detector, the PLC control system closes the exhaust shut-off valve and opens the oil-water separator outlet shut-off valve, and the entire system begins normal operation. When the pressure difference of the oil-water separator reaches the set value or according to the backwash time designed by the PLC control system, backwashing of the filter element in the oil-water separator begins. Before backwashing, the PLC control system controls the water separated from the bottom of the oil-water separator to pass through... After drainage, the PLC control system stops the delivery pump and simultaneously closes the oil-water separator inlet and outlet shut-off valves. It then opens the backwash air inlet shut-off valve to pressurize the oil-water separator. When the pressure reaches the set backwash pressure, the PLC control system pulses and opens the backwash discharge shut-off valve. Using compressed gas inside the oil-water separator as the driving force, the dehydrated organic extractant from inside the separator is rapidly flushed through an external-in, internal-out process. The backwash discharge is discharged into the backwash liquid storage tank and then into the water-containing organic solvent storage tank for circulation. After several backwashes, backwashing stops, and the PLC control system opens the exhaust shut-off valve to release pressure. After pressure release, the PLC control system adjusts the corresponding valve opening and closing states to inject liquid into the pretreatment filter and oil-water separator. When the organic solvent in the oil-water separator reaches the high-level oil-water interface detector, the PLC control system closes the exhaust shut-off valve and opens the oil-water separator outlet shut-off valve, and the entire system begins normal operation.

[0019] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A rare earth extraction organic solvent dehydration system, characterized in that, The system includes an aqueous organic solvent storage tank (1), a pretreatment filter (2), an oil-water separator (3), and a dehydrated organic solvent storage tank (4). The outlet of the aqueous organic solvent storage tank is connected to the inlet of the pretreatment filter through a pretreatment filter inlet pipe (5). The outlet of the pretreatment filter is connected to the inlet of the oil-water separator through an oil-water separator inlet pipe (6). The outlet of the oil-water separator is connected to the inlet of the dehydrated organic solvent storage tank through a dehydrated organic solvent storage tank inlet pipe (7). A drain pipe (8) is connected to the bottom of the oil-water separator. A dehydrated organic solvent storage tank outlet pipe (9) is connected to the bottom of the dehydrated organic solvent storage tank.

2. The rare earth extraction organic solvent dehydration system according to claim 1, characterized in that, The oil-water separator inlet pipe is equipped with an oil-water separator inlet shut-off valve (10), and the drain pipe is equipped with an oil-water separator drain shut-off valve (11).

3. The rare earth extraction organic solvent dehydration system according to claim 2, characterized in that, It also includes a backwash liquid storage tank (12), a compressed gas pipe (13) connected in parallel to the inlet pipe of the dehydrated organic solvent storage tank, an oil-water separator outlet shut-off valve (14) provided on the inlet pipe of the dehydrated organic solvent storage tank, a backwash inlet gas shut-off valve (15) provided on the compressed gas pipe, and an exhaust pipe (16) connected in parallel to the compressed gas pipe; the inlet of the backwash liquid storage tank is connected to the inlet pipe of the oil-water separator through a backwash drain pipe (17), the backwash drain pipe is connected to the exhaust pipe, a backwash drain shut-off valve (18) is provided on the backwash drain pipe, and an exhaust shut-off valve (19) is provided on the exhaust pipe.

4. The rare earth extraction organic solvent dehydration system according to claim 1, characterized in that, The oil-water separator is equipped with a low-level oil-water interface detector (20) and a high-level oil-water interface detector (21) on its outer side.

5. The rare earth extraction organic solvent dehydration system according to claim 1, characterized in that, The pretreatment filter inlet pipe is equipped with a delivery pump (22), a flow regulating valve (23), and a flow meter (24).

6. A rare earth extraction organic solvent dehydration system according to claim 1 or 5, characterized in that, The pretreatment filter inlet pipe is equipped with a pretreatment filter inlet pressure gauge (25).

7. The rare earth extraction organic solvent dehydration system according to claim 1, characterized in that, The oil-water separator inlet pipe is equipped with an oil-water separator inlet pressure gauge (26).

8. The rare earth extraction organic solvent dehydration system according to claim 1, characterized in that, The dehydrated organic solvent storage tank is equipped with an oil-water separator outlet pressure gauge (27) on the inlet pipe.

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