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CN-121971887-A - Stripping tower, stripping method and stripping system

CN121971887ACN 121971887 ACN121971887 ACN 121971887ACN-121971887-A

Abstract

The application discloses a stripping tower, a stripping method and a stripping system for multi-phase system extraction, wherein the stripping tower comprises a tower body, a impurity removing device, an air inlet device, a feeding device and an inner member, the tower body is provided with a working cavity, a water inlet, a water outlet and a solid outlet, the water inlet, the water outlet and the solid outlet are communicated with the working cavity, the water inlet is positioned above the water outlet and the solid outlet, the water inlet is filled with aqueous phase materials, the impurity removing device is arranged on the outer side of the tower body, the water outlet is communicated with the water inlet through the impurity removing device, at least part of the air inlet device and the feeding device is arranged at the bottom of the working cavity, the air inlet device is used for filling gas phase materials, the feeding device is used for filling organic phase materials, the inner member is arranged in the working cavity, the inner member comprises a tower plate with a reverse cone shape, and the bottom end of the tower plate is provided with a first leakage port for separating out solid sediment from the aqueous phase materials. The embodiment can recycle the water phase, can effectively discharge solid sediment, avoid blockage risk and ensure the stable operation of the extraction process.

Inventors

  • WANG YONG
  • TAN BOREN
  • XU DONGBING
  • JIANG ZICHAO
  • QI TAO

Assignees

  • 中国科学院过程工程研究所

Dates

Publication Date
20260505
Application Date
20260128

Claims (19)

  1. 1. A stripping column for use in multiphase system extraction, the stripping column comprising: The tower body is provided with a working cavity, a water inlet, a water outlet and a solid outlet, wherein the water inlet, the water outlet and the solid outlet are all communicated with the working cavity, the water inlet is positioned above the water outlet and the solid outlet, and the water inlet is used for introducing water phase materials into the working cavity; The impurity removing device is arranged at the outer side of the tower body, and the water outlet is communicated with the water inlet through the impurity removing device; the air inlet device is at least partially arranged at the bottom of the working cavity and is used for introducing gas-phase materials into the working cavity; the feeding device is at least partially arranged at the bottom of the working cavity and is used for introducing organic phase materials into the working cavity; The inner member is arranged in the working cavity, the inner member comprises a tower plate with a reverse cone, a first material leakage opening is formed in the bottom end of the tower plate, and the first material leakage opening is used for allowing solid precipitation separated out from the water phase material to pass through.
  2. 2. The stripping column according to claim 1, wherein the column plate is in a ring structure, the outer edge of the column plate is in contact with the inner wall of the column body, the first material leakage opening is formed on the inner edge of the column plate, and a plurality of sieve holes are formed at the outer edge of the column plate and are used for allowing gas phase materials and organic phase materials to pass through.
  3. 3. The stripping column according to claim 2, characterized in that the inner member further comprises a moving rod and a connecting portion, the moving rod extending vertically to pass through the first discharge opening, the wall of the first discharge opening being arranged at a distance from the moving rod, the moving rod being slidingly connected vertically to the column body and being connected to the tray via the connecting portion.
  4. 4. The stripping column as claimed in claim 2, wherein a plurality of trays are provided, a plurality of the trays being vertically spaced apart.
  5. 5. The stripping column according to claim 1, characterized in that the column body comprises: The working cavity is positioned in the main body, and the water inlet and the water outlet are formed in the main body; The first phase separation section is located below the main body part and communicated with the working cavity, the bottom wall of the first phase separation section is obliquely arranged in the direction away from the main body part, and the solid outlet is arranged at the bottom end of the first phase separation section away from the main body part.
  6. 6. The stripping column of claim 5, wherein the column further comprises: The second phase separation section is positioned above the main body part and communicated with the working cavity, and an exhaust port and an organic phase outlet are arranged on the top of the second phase separation section; The gas recovery device is communicated with the exhaust port and is used for pressurizing the recovered gas-phase material; the gas recycling device is communicated with the air inlet device through the gas mixing device, and the gas mixing device is used for mixing the pressurized gas-phase material with the introduced gas-phase material and introducing the gas-phase material into the air inlet device.
  7. 7. The stripping column of claim 6, wherein a filter screen is disposed in the vent.
  8. 8. The stripping column according to claim 6, wherein the second phase separation section is provided with a first annular baffle and a second annular baffle, the lower end of the first baffle is connected with the bottom wall of the second phase separation section, the upper end of the first baffle is arranged at intervals with the top wall of the second phase separation section, the upper end of the second baffle is connected with the top wall of the second phase separation section, the lower end of the second baffle is arranged at intervals with the bottom wall of the second phase separation section, and parts of the second baffle are arranged at intervals around the periphery of the first baffle; The exhaust port is located in the orthographic projection of the first baffle along the vertical direction, and the organic phase outlet is located outside the orthographic projection of the second baffle along the vertical direction.
  9. 9. The stripping column of claim 8, wherein a plurality of water leakage holes are provided in the side wall of the first baffle adjacent to the bottom wall of the second phase section.
  10. 10. The stripping column of claim 6, wherein the main body portion has an inner diameter R; The maximum diameter of the first phase separation section is R 1 , and the maximum diameter of the second phase separation section is R 2 , wherein R is less than or equal to R 1 ≤2.5R,1.5R≤R 2 and less than or equal to 3R.
  11. 11. The stripping column according to claim 5, wherein the main body has an outer diameter of R 3 , and the first drain has a caliber of R 4 , wherein 0.25R 3 ≤R 4 ≤0.5R 3 .
  12. 12. The stripping tower according to claim 1, wherein the air inlet device comprises a gas phase distribution ring, a gas phase support pipe and an air inlet pipe, the gas phase distribution ring is communicated with the air inlet pipe through the gas phase support pipe, a plurality of air holes are formed in the circumferential direction of the gas phase distribution ring, and the aperture of each air hole is 5-50 μm.
  13. 13. The stripping column according to claim 12, wherein the feeding device comprises an organic phase distribution ring, an organic phase supporting tube and a liquid inlet tube, the organic phase distribution ring is communicated with the liquid inlet tube through the organic phase supporting tube, a plurality of liquid holes are formed in the circumferential direction of the organic phase distribution ring, and the aperture of each liquid hole is 1 mm-8 mm.
  14. 14. The stripping column of claim 13, wherein the maximum diameter of the trays is r 1 , the outer diameter of the gas phase distribution ring is r 2 , and the outer diameter of the organic phase distribution ring is r 3 , wherein 0.5r 1 ≤r 2 ≤r 1 ,0.5r 1 ≤r 3 ≤r 1 .
  15. 15. A stripping column according to claim 1, the back extraction tower is characterized by further comprising: and the heat preservation jacket is sleeved outside the tower body and is used for providing a heat source for the working cavity.
  16. 16. A stripping column according to claim 1, the back extraction tower is characterized by further comprising: And the discharging device is arranged at the bottom of the tower body, communicated with the solid outlet and used for discharging the solid in the working cavity from the solid outlet.
  17. 17. A stripping process using a stripping column according to any one of the preceding claims 1 to 16, comprising: introducing the water phase material into the working cavity through the water inlet; After the working cavity is filled with the water phase material, introducing gas phase material and organic phase material to the bottom of the working cavity so that the gas phase material and the organic phase material are in countercurrent contact with the water phase material in the working cavity; And introducing the water phase materials in the working cavity into the water inlet after passing through the impurity removing device from the water outlet, and enabling solid sediment generated in the working cavity to fall from a first material leakage opening of the tower plate to a solid outlet.
  18. 18. The stripping process as claimed in claim 17, characterized in that in the step of introducing the aqueous phase material into the working chamber through the water inlet, the injection flow rate of the aqueous phase material is noted as D 1 L/h; In the step of introducing the gas-phase material and the organic-phase material into the bottom of the working cavity, the injection flow rate of the organic-phase material is denoted as D 2 L/h, and the injection flow rate of the gas-phase material is denoted as D 3 L/h; Wherein, the D 2 /D 1 ≤10,0.5≤D 3 /D 1 is more than or equal to 0.1 and less than or equal to 5.
  19. 19. A stripping system, comprising: stripping column according to any of the preceding claims 1 to 16; The filter press is communicated with the solid outlet of the back extraction tower and the impurity removing device, and is used for receiving solid sediment discharged from the tower body and discharging water phase materials obtained by filter pressing to the impurity removing device; And the dryer is arranged at the downstream of the filter press and is used for drying the solid precipitate which is subjected to filter pressing by the filter press.

Description

Stripping tower, stripping method and stripping system Technical Field The application relates to the technical field of extraction devices, in particular to a stripping tower, a stripping method and a stripping system. Background With the development of solvent extraction technology, the gas-liquid three-phase CO 2 stripping method is gradually applied to stripping of metal ions in organic solution, such as a CO 2 three-phase stripping method applied to extracting lithium from salt lakes, a medium CO 2 three-phase stripping method of rubidium-cesium-containing solution and the like, and the pH of an aqueous phase is adjusted by introducing CO 2 in the stripping process to form H 2CO3, so that stripping of metals such as lithium, rubidium, cesium and the like is realized. Most of lithium salt products in China come from ore lithium extraction, and an extraction method is an important method for extracting lithium from the ore. However, because the solubility of lithium bicarbonate in the aqueous phase is low (about 6-7 g/L), when the back extraction phase fluctuates, lithium bicarbonate precipitation is very easy to generate in the multi-phase system extraction equipment, the precipitated solid not only has the risk of blocking the equipment, but also can be entrained with organic phase, and the emulsification phenomenon occurs when the organic phase is recycled to the extraction end, so that the stability of the extraction process is affected. Therefore, in order to ensure that the concentration of lithium bicarbonate in the strip liquor does not exceed its saturated solubility, a large amount of pure water is consumed in the process of carrying out strip, resulting in an increase in water costs. Disclosure of Invention The embodiment of the application provides a stripping tower, a stripping method and a stripping system, which can recycle the water phase, effectively discharge solid precipitation, avoid blockage and emulsion risks and ensure the stable operation of an extraction process. In a first aspect, an embodiment of the present application provides a stripping column, applied to multiphase system extraction, the stripping column comprising: The tower body is provided with a working cavity, a water inlet, a water outlet and a solid outlet, wherein the water inlet, the water outlet and the solid outlet are all communicated with the working cavity, the water inlet is positioned above the water outlet and the solid outlet, and the water inlet is used for introducing water phase materials into the working cavity; The impurity removing device is arranged at the outer side of the tower body, and the water outlet is communicated with the water inlet through the impurity removing device; the air inlet device is at least partially arranged at the bottom of the working cavity and is used for introducing gas-phase materials into the working cavity; the feeding device is at least partially arranged at the bottom of the working cavity and is used for introducing organic phase materials into the working cavity; The inner member is arranged in the working cavity, the inner member comprises a tower plate with a reverse cone, a first material leakage opening is formed in the bottom end of the tower plate, and the first material leakage opening is used for allowing solid precipitation separated out from the water phase material to pass through. In some embodiments of the present application, the tray has an annular structure, the outer edge of the tray contacts with the inner wall of the tower body, the inner edge of the tray forms the first material leakage opening, and a plurality of sieve holes are arranged at the outer edge of the tray, and the sieve holes are used for passing the gas phase material and the organic phase material. In some embodiments of the present application, the inner member further includes a moving rod and a connection portion, the moving rod extends vertically to pass through the first discharge outlet, a wall of the first discharge outlet is spaced from the moving rod, and the moving rod is slidably connected to the tower vertically and is connected to the tray through the connection portion. In some embodiments of the application, the trays are provided in a plurality of vertically spaced apart rows. In some embodiments of the application, the tower comprises: The working cavity is positioned in the main body, and the water inlet and the water outlet are formed in the main body; The first phase separation section is located below the main body part and communicated with the working cavity, the bottom wall of the first phase separation section is obliquely arranged in the direction away from the main body part, and the solid outlet is arranged at the bottom end of the first phase separation section away from the main body part. In some embodiments of the application, the tower further comprises: The second phase separation section is positioned above the main body part and communicated wi