Ion exchange countercurrent system

Abstract

This invention provides an ion exchange countercurrent system, relating to the field of ion exchange technology. It includes a first adsorption column, a stripping column, a stripping mixing column, and a sieving device. The first adsorption column has a first accommodating cavity and a first inlet communicating with the first accommodating cavity. The first accommodating cavity is used to contain a mixture of adsorbent and slurry, and the first inlet is suitable for introducing the slurry. The stripping column is used to lift the adsorbent and slurry mixture from bottom to top to discharge the reacted adsorbent and slurry mixture. The first accommodating cavity contains the stripping column and the stripping mixing column. The sieving device includes a screen extending vertically and has an overflow port. The first adsorption column is equipped with the sieving device, and at least a portion of the screen in the first adsorption column is located in the first accommodating cavity. Within the first accommodating cavity, the stripping column, the stripping mixing column, and the screen are arranged horizontally. This invention can effectively reduce the wear of the adsorbent by the screen between the adsorption columns during sieving, thereby ensuring the mass transfer effect of the adsorbent.

Description

Technical Field

[0001] This utility model relates to the field of ion exchange technology, and in particular to an ion exchange countercurrent system. Background Technology

[0002] Ion adsorption is a common technique in wastewater treatment, mineral smelting, and element separation. Systems used for ion adsorption are often multi-stage series fixed-bed systems, which cannot be applied to the treatment of non-pure liquid raw materials (such as mineral slurries). To address this, two structural forms have been employed: one is a countercurrent adsorption system, where linear screens are placed between each reaction column, allowing the slurry and adsorbent to contact the screens from top to bottom for separation; the other is an adsorption tank, where the screening device is a cylindrical, inverted cylinder completely submerged in the slurry, allowing the slurry to rise through the screen to the overflow outlet for further separation.

[0003] However, in actual use, the adsorbent in the countercurrent adsorption system will frequently rub against the screen, which can easily cause wear on the adsorbent. After long-term operation, sludge will accumulate inside the adsorption tank, which can easily cause the screen cylinder to become clogged. This requires frequent replacement of the screen cylinder, which affects production efficiency. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose an ion exchange countercurrent system, which can effectively reduce the wear of the adsorbent on the screen between adsorption columns during sieving, so as to ensure the mass transfer effect of the adsorbent.

[0006] An ion exchange countercurrent system according to an embodiment of the present invention includes a first adsorption column, a stripping column, a stripping mixing column, and a sieving device. The first adsorption column has a first accommodating cavity and a first inlet communicating with the first accommodating cavity. The first accommodating cavity is used to contain an adsorbent and a mineral slurry mixture, and the first inlet is adapted to allow the mineral slurry to pass through. The stripping column is used to lift the adsorbent and mineral slurry mixture from bottom to top to discharge the reacted adsorbent and mineral slurry mixture. The first accommodating cavity contains the stripping column and the stripping mixing column. The sieving device includes a screen extending in a vertical direction and has an overflow port. The screen is used to cover the overflow port. The first adsorption column is equipped with the sieving device. At least a portion of the screen in the first adsorption column is disposed in the first accommodating cavity. In the first accommodating cavity, the stripping column, the stripping mixing column, and the screen are arranged in a horizontal direction.

[0007] According to the ion exchange countercurrent system of this utility model embodiment, the adsorbent and slurry entering the first accommodating cavity are fully mixed by the air-lift mixing column in the first adsorption column, so that the adsorbent can effectively adsorb the target substances in the slurry. The air-lift lifting column can lift the reacted adsorbent and slurry mixture from bottom to top to discharge it from the first adsorption column, while the screen is used to intercept the adsorbent and allow the reacted slurry to pass through. Because the screen extends vertically in the first accommodating cavity, that is, the screen is vertically arranged in the first adsorption column, the mixture in the first accommodating cavity will pass through the screen horizontally to filter and intercept the adsorbent, and allow the reacted slurry in the mixture to pass through the screen and overflow into the overflow port. The adsorbent discharged from the air-lift mixing column is dispersed in all directions, with only a small proportion distributed towards the screen. Simultaneously, this portion of the adsorbent is also affected by the horizontal direction, meaning the pressure perpendicular to the screen surface is only a component of its inertial flow force. Under air-lift action, the adsorbent and slurry circulate gently inside and outside the air-lift mixing column. Therefore, the aforementioned component force is very small, and the resulting friction is far lower than the friction generated between the adsorbent and the screen when flowing downwards due to gravity in related technologies. Therefore, compared to related technologies, this invention can effectively reduce the wear of the adsorbent on the screen between adsorption columns during screening, ensuring the mass transfer effect of the adsorbent.

[0008] In some embodiments, the countercurrent system further includes a second adsorption column, which is lower than the first adsorption column in the vertical direction. The second adsorption column has a second accommodating cavity and is provided with a third inlet and a fourth inlet communicating with the second accommodating cavity. The second accommodating cavity is used to contain the adsorbent and the slurry mixture. The third inlet is able to communicate with the overflow port in the first adsorption column, and the fourth inlet is adapted to allow the adsorbent to pass through.

[0009] The first adsorption column is further provided with a second inlet that communicates with the first accommodating cavity. The second accommodating cavity is provided with the air-lifting column and the air-lifting mixing column. The outlet of the air-lifting column in the second adsorption column can communicate with the second inlet. The second adsorption column is also provided with the sieving device. At least a portion of the screen in the second adsorption column is disposed in the second accommodating cavity. In the second accommodating cavity, the air-lifting column, the air-lifting mixing column and the screen are arranged along the horizontal direction.

[0010] In some embodiments, the countercurrent system further includes an intermediate adsorption column, which is located between the first adsorption column and the second adsorption column, and the first adsorption column, the intermediate adsorption column and the second adsorption column are arranged in a stepped manner along the horizontal direction; The intermediate adsorption column has a third accommodating cavity and is provided with a fifth inlet and a sixth inlet communicating with the third accommodating cavity. The third accommodating cavity is used to contain the adsorbent and the slurry mixture. The fifth inlet is communicating with the overflow port in the first adsorption column, and the sixth inlet is communicating with the outlet of the air stripping column in the second adsorption column. The third accommodating cavity is provided with the air-lifting column and the air-lifting mixing column, and the outlet of the air-lifting column in the intermediate adsorption column is connected to the second inlet; The intermediate adsorption column is also provided with the sieving device. The overflow port of the intermediate adsorption column is connected to the third inlet. At least a portion of the screen in the intermediate adsorption column is disposed in the third accommodating cavity. In the third accommodating cavity, the air-lifting column, the air-lifting mixing column and the screen are arranged along the horizontal direction.

[0011] In some embodiments, the countercurrent system further includes a first storage tank, a second storage tank, a third storage tank, a first screen, and a fourth storage tank. The first storage tank is connected to the first inlet to supply slurry to the first adsorption column; the second storage tank is adapted to be connected to the fourth inlet to supply adsorbent to the second adsorption column; the third storage tank is connected to the overflow port in the second adsorption column to recover the reacted slurry; the outlet of the air stripping column in the first adsorption column, the first screen, and the fourth storage tank are connected in sequence, and the fourth storage tank is used to recover the reacted adsorbent.

[0012] In some embodiments, the first screen is provided with a slurry outlet, which is connected to the first accommodating cavity.

[0013] In some embodiments, the second storage tank is provided with a water inlet and a discharge outlet, wherein the water inlet is located above the discharge outlet in the vertical direction; The countercurrent system also includes a second screen and a fifth storage tank. The discharge port, the second screen and the fourth inlet are connected in sequence. The fifth storage tank is connected to the water inlet to supply water to the discharge port.

[0014] In some embodiments, the second screen is provided with a liquid outlet, which is connected to the fifth storage tank to recover the transported water.

[0015] In some embodiments, the screen is a flat screen.

[0016] In some embodiments, at least a portion of the screen is located above the plane containing the adsorbent and slurry mixture in any one of the first, second, and third accommodating cavities.

[0017] In some embodiments, the top of at least one of the first adsorption column, the second adsorption column, and the intermediate adsorption column is lower than the top of the corresponding sieve.

[0018] In some embodiments, the screening device further includes a side plate, a back plate, a middle plate, and a bottom plate.

[0019] The screen, the side plate, and the back plate together surround the molded mounting cavity. The back plate is arranged opposite to the screen, and the overflow port is located on the side of the back plate away from the screen. The intermediate plate is connected to the side plate and located in the mounting cavity. The intermediate plate divides the mounting cavity into a first chamber and a second chamber. Any one of the first accommodating cavity, the second accommodating cavity and the third accommodating cavity is connected to the first chamber through the screen. The second chamber is connected to the overflow port. The bottom plate is connected to each of the screen, the side plate and the back plate and closes the bottom opening of the mounting cavity. The bottom end of the intermediate plate is spaced apart from the bottom plate and a flow channel is defined between them. The first chamber, the flow channel and the second chamber are connected in sequence.

[0020] In some embodiments, the cross-sectional area of ​​the flow channel is smaller than the area of ​​the screen.

[0021] In some embodiments, the distance between the screen and the intermediate plate is a, the distance between the intermediate plate and the bottom plate is b, and the distance between the intermediate plate and the back plate is c, where a=b=c.

[0022] In some embodiments, the outer contour of the cross-section of the base plate is an inverted cone or a trapezoid with a larger top and a smaller bottom.

[0023] In some embodiments, the screen is detachably connected to the side plate.

[0024] In some embodiments, the screening device further includes chutes connected to the side plate, and there are two chutes disposed on both sides of the screen along its width direction. The screen and the chutes are slidably connected along the vertical direction.

[0025] In some embodiments, the overflow outlet extends downward at an angle away from the back plate, and the cross-sectional area of ​​the overflow outlet gradually decreases along its extending direction.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the ion exchange countercurrent system according to an embodiment of the present invention.

[0028] Figure 2 This is a first-view structural schematic diagram of the sieving device in an ion exchange countercurrent system according to an embodiment of the present invention.

[0029] Figure 3 This is a second-view structural schematic diagram of the sieving device in an ion exchange countercurrent system according to an embodiment of the present invention.

[0030] Figure 4 yes Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0031] Figure label: 1. First adsorption column; 11. First accommodating cavity; 12. First inlet; 13. Second inlet; 2. Air-lift column; 3. Air-lift mixing column; 4. Screening device; 41. Screen; 42. Overflow port; 43. Side plate; 44. Back plate; 45. Intermediate plate; 46. Bottom plate; 47. Installation cavity; 471. First chamber; 472. Second chamber; 48. Guide channel; 49. Chute; 5. Second adsorption column; 51. Second accommodating cavity; 52. Third inlet; 53. Fourth inlet; 6. Intermediate adsorption column; 61. Third accommodating cavity; 62. Fifth inlet; 63. Sixth inlet; 7. Overflow valve; 8. First storage tank; 81. Second storage tank; 811. Water inlet; 812. Discharge outlet; 82. Third storage tank; 83. First screen; 831. Slurry outlet; 84. Fourth storage tank; 9. Second sieve; 91. Fifth storage tank; 92. Liquid outlet. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] like Figure 1As shown, an ion exchange countercurrent system according to an embodiment of the present invention includes a first adsorption column 1, a stripping column 2, a stripping mixing column 3, and a sieving device 4. The first adsorption column 1 has a first accommodating cavity 11 and a first inlet 12 communicating with the first accommodating cavity 11. The first accommodating cavity 11 is used to contain a mixture of adsorbent and slurry, and the first inlet 12 is suitable for introducing slurry. The stripping column 2 is used to lift the mixture of adsorbent and slurry from bottom to top to discharge the reacted adsorbent and slurry mixture. The first accommodating cavity 11 is provided with the stripping column 2 and the stripping mixing column 3. The sieving device 4 includes a screen 41 extending in the vertical direction and is provided with an overflow port 42. The screen 41 is used to block the overflow port 42. The first adsorption column 1 is provided with the sieving device 4, and at least a portion of the screen 41 in the first adsorption column 1 is disposed in the first accommodating cavity 11. In the first accommodating cavity 11, the stripping column 2, the stripping mixing column 3, and the screen 41 are arranged in the horizontal direction.

[0034] According to the ion exchange countercurrent system of this utility model embodiment, the adsorbent and slurry entering the first accommodating cavity 11 are fully mixed by the air-lift mixing column 3 in the first adsorption column 1, so that the adsorbent can effectively adsorb the target substances in the slurry. The air-lift lifting column 2 can lift the reacted adsorbent and slurry mixture from bottom to top to discharge it from the first adsorption column 1. The screen 41 is used to intercept the adsorbent and allow the reacted slurry to pass through. Since the screen 41 extends vertically in the first accommodating cavity 11, that is, the screen 41 is vertically arranged in the first adsorption column 1, the mixture in the first accommodating cavity 11 will be filtered and the adsorbent will be intercepted by the screen 41 in the horizontal direction, and the reacted slurry in the mixture will enter the overflow port through the screen 41. 42 overflows, while the adsorbent discharged from the air-lift mixing column 3 disperses to various places. Only a small proportion of the adsorbent is distributed to the direction of the screen 41. At the same time, this part of the adsorbent is also affected by the horizontal direction. Therefore, the pressure of this part of the adsorbent perpendicular to the surface of the screen 41 is only a component of its flow inertia force. Under the action of air lifting, the adsorbent and slurry circulate gently inside and outside the air-lift mixing column 3. Therefore, the aforementioned component force is very small, and the resulting friction is much lower than the friction between the adsorbent and the screen 41 when the adsorbent flows from top to bottom in the related technology due to the downward gravity. Therefore, compared with the related technology, this utility model can effectively reduce the wear of the screen 41 between the adsorption columns on the adsorbent during screening, so as to ensure the mass transfer effect of the adsorbent.

[0035] Specifically, the first adsorption column 1, the first accommodating cavity 11, the air-lifting column 2, and the air-lifting mixing column 3 can all extend vertically. The first inlet 12 can be located on the side wall of the first adsorption column 1. The second inlet 13 can be located at the top of the first adsorption column 1. The air-lifting mixing column 3 is used to thoroughly mix the adsorbent and the slurry. The air-lifting column 2 can lift the adsorbent and slurry mixture from bottom to top by introducing air into it, and the air-lifting mixing column 3 can promote thorough mixing of the adsorbent and the slurry by introducing air into it. The specific structure and working principle of the air-lifting column 2 and the air-lifting mixing column 3 can be based on existing technology in the field and will not be elaborated here. The inlets of both the air-lifting column 2 and the air-lifting mixing column 3 are immersed in the mixture and spaced apart from the bottom of the first accommodating cavity 11. The outlet of the air-lifting column 2 can extend out of the top of the first adsorption column 1, and the outlet of the air-lifting mixing column 3 can be located within the first accommodating cavity 11. The screen 41 extends vertically, meaning it is arranged vertically to filter the mixture horizontally. Within the first accommodating cavity 11, the air-lift column 2, the air-lift mixing column 3, the screen 41, and the overflow port 42 are arranged sequentially and alternately in the horizontal direction.

[0036] It should be noted that when an adsorbent (such as resin) is mixed and reacted with the slurry, the target substance in the slurry can be adsorbed and separated, so that the target substance in the slurry can be recovered through the adsorbent. For example, ion exchange resin (i.e., adsorbent) directly contacts the solid-containing slurry, adsorbs the target substance in the liquid phase of the slurry onto the resin, and after multi-stage adsorption or sieving of the resin and desorption of the resin, the target substance enriched solution can be obtained.

[0037] In addition, in the related technologies, when filtering the mixture after the reaction, the mixture often flows from top to bottom. The slurry in the mixture passes through the screen 41, while the adsorbent in the mixture is intercepted by the screen 41. During this process, the adsorbent is affected by the downward gravity, and there will inevitably be a certain friction between the adsorbent and the screen 41, which can easily wear down the adsorbent and thus affect the mass transfer effect of the adsorbent.

[0038] like Figure 1 As shown, in some embodiments, the countercurrent system further includes a second adsorption column 5, which is lower than the first adsorption column 1 in the vertical direction. In other words, the top of the second adsorption column 5 is lower than the top of the first adsorption column 1, so that there is a height difference between the two, which is beneficial for the reaction mixture to flow to the next-stage adsorption column. The second adsorption column 5 has a second accommodating cavity 51 and is provided with a third inlet 52 and a fourth inlet 53 communicating with the second accommodating cavity 51. The second accommodating cavity 51 is used to contain the adsorbent and the slurry mixture. The third inlet 52 can communicate with the overflow port 42 in the first adsorption column 1, and the fourth inlet 53 is suitable for introducing the adsorbent.

[0039] The first adsorption column 1 is also provided with a second inlet 13 that connects to the first accommodating cavity 11. The second accommodating cavity 51 is provided with an air-lifting column 2 and an air-lifting mixing column 3. The outlet of the air-lifting column 2 in the second adsorption column 5 can be connected to the second inlet 13.

[0040] The second adsorption column 5 is also provided with a sieving device 4. At least a portion of the screen 41 in the second adsorption column 5 is provided in the second accommodating cavity 51. In the second accommodating cavity 51, the air-lifting column 2, the air-lifting mixing column 3 and the screen 41 are arranged in a horizontal direction.

[0041] It is understandable that the combination of the first adsorption column 1 and the second adsorption column 5 forms a two-stage adsorption filtration structure, which can improve the extraction effect of the target substances in the slurry by the countercurrent system. Since the flow direction of the raw material slurry and the raw material adsorbent in the two-stage adsorption filtration structure are opposite, that is, the raw material slurry is injected from the first adsorption column 1 and flows through the second adsorption column 5, while the raw material adsorbent is injected from the second adsorption column 5 and flows through the first adsorption column 1, the adsorption efficiency of the adsorbent on the target substances in the slurry can be fully guaranteed. At the same time, the coordinated arrangement of the air-lifting column 2, the air-lifting mixing column 3 and the screen 41 in each of the first adsorption column 1 and the second adsorption column 5 also reduces the wear of the adsorbent by the screen 41 between the adsorption columns.

[0042] Specifically, the arrangement of the air-lift column 2, air-lift mixing column 3, and screen 41 in the second adsorption column 5 within the second accommodating cavity 51 can be the same as the arrangement in the first adsorption column 1 described above. The third inlet 52 can be located on the side wall of the second adsorption column 5. The fourth inlet 53 can be located at the top of the second adsorption column 5. The overflow port 42 in the first adsorption column 1 is higher than the third inlet 52 in the vertical direction.

[0043] like Figure 1 As shown, in some embodiments, the countercurrent system further includes an intermediate adsorption column 6, which is located between the first adsorption column 1 and the second adsorption column 5. The first adsorption column 1, the intermediate adsorption column 6, and the second adsorption column 5 are arranged in a stepped manner along the horizontal direction. In other words, the top of the first adsorption column 1 is higher than the top of the intermediate adsorption column 6, and the top of the intermediate adsorption column 6 is higher than the top of the second adsorption column 5, so that there is a height difference between the three, which is beneficial for the mixture after the reaction to flow to the next level adsorption column.

[0044] The intermediate adsorption column 6 has a third accommodating cavity 61 and is provided with a fifth inlet 62 and a sixth inlet 63 that are connected to the third accommodating cavity 61. The third accommodating cavity 61 is used to contain the adsorbent and the slurry mixture. The fifth inlet 62 is connected to the overflow port 42 in the first adsorption column 1, and the sixth inlet 63 is connected to the outlet of the air stripping column 2 in the second adsorption column 5.

[0045] The third accommodating cavity 61 is provided with an air-lifting column 2 and an air-lifting mixing column 3, and the outlet of the air-lifting column 2 in the intermediate adsorption column 6 is connected to the second inlet 13.

[0046] The intermediate adsorption column 6 is also equipped with a sieving device 4. The overflow port 42 in the intermediate adsorption column 6 is connected to the third inlet 52. At least part of the screen 41 in the intermediate adsorption column 6 is located in the third accommodating cavity 61. In the third accommodating cavity 61, the air-lifting column 2, the air-lifting mixing column 3 and the screen 41 are arranged in a horizontal direction.

[0047] It is understandable that the first adsorption column 1, the intermediate adsorption column 6, and the second adsorption column 5 work together to form a three-stage adsorption filtration structure, which can further optimize the extraction effect of the target substances in the slurry by the countercurrent system. Similarly, as with the above two-stage adsorption filtration structure, it can fully ensure the adsorption efficiency of the adsorbent on the target substances in the slurry and reduce the wear of the adsorbent by the screen 41 between the adsorption columns.

[0048] Specifically, the arrangement of the air-lift column 2, air-lift mixing column 3, and screen 41 in the third accommodating cavity 61 of the intermediate adsorption column 6 can be the same as the arrangement in the first adsorption column 1. The fifth inlet 62 can be opened on the side wall of the intermediate adsorption column 6. The sixth inlet 63 can be opened at the top of the intermediate adsorption column 6. The overflow port 42 in the first adsorption column 1 is higher than the fifth inlet 62 in the vertical direction, and the overflow port 42 in the intermediate adsorption column 6 is higher than the third inlet 52 in the vertical direction.

[0049] like Figure 1 As shown, in some embodiments, there are multiple intermediate adsorption columns 6. The first adsorption column 1, all intermediate adsorption columns 6 and the second adsorption column 5 are arranged in a stepped manner along the horizontal direction. The overflow port 42 in any intermediate adsorption column 6 is connected to the fifth inlet 62 of the adjacent intermediate adsorption column 6, and the sixth inlet 63 of any intermediate adsorption column 6 is connected to the outlet of the air stripping column 2 in the adjacent intermediate adsorption column 6.

[0050] The outlet of the air-lift column 2 in the intermediate adsorption column 6 adjacent to the first adsorption column 1 is connected to the second inlet 13. The fifth inlet 62 of the intermediate adsorption column 6 adjacent to the first adsorption column 1 is connected to the overflow port 42 in the first adsorption column 1. The sixth inlet 63 of the intermediate adsorption column 6 adjacent to the second adsorption column 5 is connected to the outlet of the air-lift column 2 in the second adsorption column 5. The overflow port 42 of the intermediate adsorption column 6 adjacent to the second adsorption column 5 is connected to the third inlet 52.

[0051] Understandably, the above structural design forms a multi-stage adsorption and filtration structure, which can maximize the extraction effect of the countercurrent system on the target substances in the slurry.

[0052] Specifically, the overflow port 42 in the upper-level intermediate adsorption column 6 is higher than the fifth inlet 62 of the lower-level intermediate adsorption column 6 in the vertical direction. Overflow valves 7 can be provided between the fifth inlet 62 of the intermediate adsorption column 6 adjacent to the first adsorption column 1 and the overflow port 42 in the first adsorption column 1, between the overflow port 42 of any intermediate adsorption column 6 and the fifth inlet 62 of the adjacent intermediate adsorption column 6, and between the overflow port 42 of the intermediate adsorption column 6 adjacent to the second adsorption column 5 and the third inlet 52. The hydraulic pressure is controlled by the overflow valves 7 between the stages to stabilize the overflow flow of each adsorption column.

[0053] like Figure 1 As shown, in some embodiments, the countercurrent system further includes a first storage tank 8, a second storage tank 81, a third storage tank 82, a first screen 83, and a fourth storage tank 84. The first storage tank 8 is connected to a first inlet 12 to supply slurry to the first adsorption column 1; the second storage tank 81 is adapted to be connected to a fourth inlet 53 to supply adsorbent to the second adsorption column 5; the third storage tank 82 is connected to an overflow port 42 in the second adsorption column 5 to recover the slurry after reaction; the outlet of the air stripping column 2 in the first adsorption column 1, the first screen 83, and the fourth storage tank 84 are connected in sequence, and the fourth storage tank 84 is used to recover the adsorbent after reaction.

[0054] Understandably, the above structural design enables the separate recovery of the post-reaction slurry and the post-reaction adsorbent, further improving the overall performance of the countercurrent system.

[0055] Specifically, the first storage tank 8 can supply the raw material slurry to the first inlet 12 via a transfer pump. The second storage tank 81 can be higher than the second adsorption column 5 in the vertical direction, so that the raw material adsorbent in the second storage tank 81 can be automatically supplied to the fourth inlet 53 under gravity. The third storage tank 82 can be lower than the overflow port 42 in the second adsorption column 5 in the vertical direction, so that the slurry after reaction can be automatically recovered to the third storage tank 82 under gravity. The height of the outlet of the air-lift column 2 in the first adsorption column 1, the height of the first screen 83 (i.e., the tail screen), and the height of the fourth storage tank 84 can decrease sequentially. The first screen 83 can be an inclined screen, which is used to filter and intercept the adsorbent after reaction.

[0056] like Figure 1 As shown, in some embodiments, the first screen 83 is provided with a slurry outlet 831, which is connected to the first accommodating cavity 11. After the mixed liquid discharged by the air-lift column 2 in the first adsorption column 1 is screened by the first screen 83, the screened slurry can be returned to the first accommodating cavity 11 to ensure efficient extraction of the target substance in the slurry.

[0057] like Figure 1 As shown, in some embodiments, the second storage tank 81 is provided with an inlet 811 and an outlet 812, with the inlet 811 located above the outlet 812 in the vertical direction.

[0058] The countercurrent system also includes a second screen 9 and a fifth storage tank 91. The discharge port 812, the second screen 9 and the fourth inlet 53 are connected in sequence. The fifth storage tank 91 is connected to the water inlet 811 to supply water to the discharge port 812.

[0059] It is understandable that when the raw material adsorbent is transported by gravity from the second storage tank 81 (i.e., the high-level tank), in order to avoid blockage of the discharge port 812, water can be supplied to the raw material adsorbent above the discharge port 812. That is, a water inlet 811 is opened on the lower side of the second storage tank 81, and the water is supplied to the inlet by the fifth storage tank 91. The water is then separated by the second screen 9 (i.e., the first screen), so that the adsorbent can smoothly enter the second adsorption column 5.

[0060] Specifically, the fifth storage tank 91 can be pumped to the inlet 811 by a transfer pump. The height of the outlet 812, the height of the second screen 9, and the height of the fourth inlet 53 can decrease sequentially.

[0061] like Figure 1 As shown, in some embodiments, the second screen 9 is provided with a liquid outlet 92, which is connected to the fifth storage tank 91 to recover the transported water, realize the reuse of the transported water, and save water resources. The liquid outlet 92 is located above the fifth storage tank 91 in the vertical direction.

[0062] like Figure 2 and Figure 3 As shown, in some embodiments, the screen 41 is a flat screen, and the use of a flat screen structure can reduce the difficulty of manufacturing spare parts for the countercurrent system.

[0063] like Figure 1 As shown, in some embodiments, at least a portion of the screen 41 is located above the plane containing the adsorbent and slurry mixture in any one of the first accommodating cavity 11, the second accommodating cavity 51, and the third accommodating cavity 61. In other words, at least a portion of the screen 41 in the first adsorption column 1 is located above the plane containing the adsorbent and slurry mixture in the first accommodating cavity 11, at least a portion of the screen 41 in the second adsorption column 5 is located above the plane containing the adsorbent and slurry mixture in the second accommodating cavity 51, and at least a portion of the screen 41 in the intermediate adsorption column is located above the plane containing the adsorbent and slurry mixture in the third accommodating cavity 61.

[0064] Understandably, by adopting the above structural design, the screen 41 vertically arranged in the corresponding accommodating cavity can be partially immersed in the mixed liquid. If the screen 41 is slightly blocked, the liquid level of the mixed liquid outside the screen 41 will rise, and the contact area between the mixed liquid and the screen 41 during actual screening will also increase, which is conducive to promoting the screening effect and realizing the self-adjustment of the screening area. This can reduce the replacement frequency of the screen 41 and improve production efficiency.

[0065] like Figure 1 As shown, in some embodiments, the top of at least one of the first adsorption column 1, the second adsorption column 5, and the intermediate adsorption column is lower than the top of the corresponding sieve 41. In other words, the top of the first adsorption column 1 is lower than the top of the sieve 41 in the first adsorption column 1; or, the top of the second adsorption column 5 is lower than the top of the sieve 41 in the second adsorption column 5; or, the top of the intermediate adsorption column is lower than the top of the sieve 41 in the intermediate adsorption column; or, the top of the first adsorption column 1 and the top of the second adsorption column 5 are both lower than the top of their respective sieve 41; or, the top of the first adsorption column 1 and the top of the intermediate adsorption column are both lower than the top of their respective sieve 41; or, the top of the second adsorption column 5 and the top of the intermediate adsorption column are both lower than the top of their respective sieve 41; or, the top of each of the first adsorption column 1, the second adsorption column 5, and the intermediate adsorption column is lower than the top of its respective sieve 41.

[0066] Understandably, having the top of the screen 41 higher than the corresponding adsorption column facilitates the replacement of the screen 41 later. Compared with related technologies, it eliminates the need for manual entry into the adsorption column to replace the screen 41, making the operation convenient.

[0067] like Figure 2 and Figure 3 As shown, in some embodiments, the screening device 4 further includes a side plate 43, a back plate 44, a middle plate 45, and a bottom plate 46.

[0068] Among them, the screen 41, the side plate 43 and the back plate 44 together surround the molding and mounting cavity 47. The back plate 44 is arranged opposite to the screen 41, and the overflow port 42 is located on the side of the back plate 44 away from the screen 41.

[0069] The intermediate plate 45 is connected to the side plate 43 and located in the mounting cavity 47. The intermediate plate 45 divides the mounting cavity 47 into a first chamber 471 and a second chamber 472. Any one of the first receiving cavity 11, the second receiving cavity 51 and the third receiving cavity 61 is connected to the first chamber 471 through the screen 41, and the second chamber 472 is connected to the overflow port 42.

[0070] The bottom plate 46 is connected to each of the screen 41, side plate 43 and back plate 44 and closes the bottom opening of the mounting cavity 47. The bottom end of the intermediate plate 45 is spaced apart from the bottom plate 46 and the two define a flow channel 48. The first chamber 471, the flow channel 48 and the second chamber 472 are connected in sequence.

[0071] Understandably, the intermediate plate 45 inside the installation cavity 47 can guide the slurry, so that the slurry passing through the screen 41 must pass through the guide channel 48 before reaching the overflow port 42, which greatly enhances the disturbance effect inside the screening device 4. Compared with related technologies, it effectively alleviates the problem of sludge deposition. Moreover, this structure does not require external stirring or other power equipment, and will not increase additional power consumption.

[0072] For example, as shown in the figure, there can be two side panels 43. In this case, both the first chamber 471 and the second chamber 472 are flat spaces.

[0073] like Figure 2 and Figure 3 As shown, in some embodiments, the cross-sectional area of ​​the guide channel 48 is smaller than the area of ​​the screen 41. When the slurry flows, the flow rate through the screen 41 is equal to the slurry velocity multiplied by the area of ​​the screen 41. Since the area of ​​the screen 41 is larger than the cross-sectional area of ​​the guide channel 48, the set flow rate of slurry can enter the screen 41 at a smaller flow rate. When the slurry passes through the guide channel 48, the cross-sectional area becomes smaller, and the same flow rate of slurry will pass through at a larger flow rate, thus achieving a disturbance effect. At the same time, since the second chamber 472 is a flat space, that is, the distance between the middle plate 45 and the back plate 44 is also small, the slurry can maintain a larger flow rate when it continues to flow upward, preventing the sedimentation of sludge.

[0074] Specifically, the cross-section of the flow channel 48 is orthogonal to the horizontal direction.

[0075] like Figure 2 and Figure 3 As shown, in some embodiments, the distance between the screen 41 and the intermediate plate 45 is a, the distance between the intermediate plate 45 and the bottom plate 46 is b, and the distance between the intermediate plate 45 and the back plate 44 is c, where a=b=c. In other words, the distances from the screen 41 to the intermediate plate 45, from the bottom of the intermediate plate 45 to the bottom plate 46, and from the intermediate plate 45 to the back plate 44 are similar, so that the slurry can pass smoothly at a suitable speed (such as 1.5-3 m / s). If the distance is too large, the slurry flow speed will be too slow, which will lead to the deposition of sludge. If the distance is too small, the slurry flow rate will be limited by the viscosity of the slurry, which will limit the slurry flow rate and thus affect the processing capacity of the countercurrent system.

[0076] like Figure 2 and Figure 3 As shown, in some embodiments, the outer contour of the cross-section of the bottom plate 46 is an inverted cone or a trapezoid with a larger top and a smaller bottom, in order to further enhance the disturbance effect inside the screening device 4 and prevent the deposition of sludge.

[0077] like Figures 2 to 4 As shown, in some embodiments, the screen 41 and the side plate 43 are detachably connected to facilitate the disassembly and maintenance of the screen 41 in the future. At the same time, if one of the connected parts fails, only the corresponding damaged part needs to be replaced to enable the screening device 4 to work normally, without scrapping the entire screening device 4, thus further effectively reducing the maintenance cost of the screening device 4.

[0078] like Figure 4As shown, in some embodiments, the screening device 4 further includes a chute 49, which is connected to the side plate 43. There are two chute 49s, which are respectively disposed on both sides of the screen 41 along its width direction. The screen 41 and the chute 49 are slidably connected in the vertical direction.

[0079] It is understandable that the screen 41 can be inserted and replaced in the screening device 4 through the chute 49, and since the top of the screen 41 is higher than the top of the corresponding adsorption column, the screen 41 can be disassembled and assembled without manual entry into the adsorption column, making the operation simple and easy.

[0080] like Figures 1 to 3 As shown, in some embodiments, the overflow port 42 extends downward at an angle away from the back plate 44, and the cross-sectional area of ​​the overflow port 42 gradually decreases along its extension direction. For example, as shown in the figure, the front end of the overflow port 42 is wide and the rear end is narrow. This structural design facilitates the smooth entry of slurry into the overflow port 42 and enables it to enter the next stage adsorption column at a higher flow rate.

[0081] Therefore, compared with related technologies, this utility model has the following advantages: 1) By incorporating and vertically setting the interstage screen 41, the wear between the adsorbent and the screen 41 in the countercurrent system is reduced as a whole; 2) The internal disturbance of the screening device 4 is enhanced, which can prevent the deposition of mineral slime; 3) The screen 41 is partially submerged in the corresponding cavity, which enables the screening area to have a self-adjusting function, reduces the replacement frequency of the screen 41, and improves production efficiency. 4) The top of the sieve 41 is higher than the corresponding adsorption column, and the replacement method is a pull-in method, which is easy to operate. Meanwhile, the sieve... 41 can be a flat screen, which simplifies the manufacturing of spare parts.

[0082] The working process of this countercurrent system is explained below, based on its specific structure. The slurry is pumped from the first storage tank 8 into the first adsorption column 1 and overflows sequentially. The hydraulic pressure is controlled by the interstage overflow valves 7 to stabilize the overflow flow rate of each adsorption column. The adsorbent is transported by gravity from the second storage tank 81 (i.e., the high-level tank). To avoid blockage, water is supplied to the lower side of the second storage tank 81. The water is then separated by the second screen 9 (i.e., the first screen), allowing the adsorbent to enter the fourth inlet 53 of the second adsorption column 5. The water is reused. Simultaneously, two streams of air are introduced into each adsorption column. One stream enters the air-lift mixing column 3 to fully mix the adsorbent and slurry, promoting the adsorption reaction. The other stream enters the air-lift lifting column 2, lifting both the adsorbent and slurry to a higher position before entering the next adsorption column. The material lifted from the first adsorption column 1 passes through the first screen 83 (i.e., the tail screen) to separate the adsorbent and slurry. The separated adsorbent enters the fourth storage tank 84, while the slurry returns to the first adsorption column 1.

[0083] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0086] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0087] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0088] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An ion exchange counterflow system characterized in that, include: A first adsorption column, the first adsorption column having a first accommodating cavity and a first inlet communicating with the first accommodating cavity, the first accommodating cavity being used to contain an adsorbent and a slurry mixture, and the first inlet being suitable for introducing slurry; The air-lifting column and the air-lifting mixing column are provided in the first accommodating cavity. The air-lifting column is used to lift the adsorbent and slurry mixture from bottom to top to discharge the reacted adsorbent and slurry mixture. A screening device, the screening device including a screen extending in a vertical direction and having an overflow port, the screen being used to block the overflow port, the first adsorption column having the screening device, at least a portion of the screen in the first adsorption column being disposed in the first accommodating cavity, the air-lifting column, the air-lifting mixing column and the screen being arranged in a horizontal direction in the first accommodating cavity.

2. The ion exchange counterflow system of claim 1, wherein, It also includes a second adsorption column, which is lower than the first adsorption column in the vertical direction. The second adsorption column has a second accommodating cavity and is provided with a third inlet and a fourth inlet communicating with the second accommodating cavity. The second accommodating cavity is used to contain the adsorbent and the slurry mixture. The third inlet can communicate with the overflow port in the first adsorption column, and the fourth inlet is suitable for introducing the adsorbent. The first adsorption column is further provided with a second inlet that communicates with the first accommodating cavity. The second accommodating cavity is provided with the air-lifting column and the air-lifting mixing column. The outlet of the air-lifting column in the second adsorption column can communicate with the second inlet. The second adsorption column is also provided with the sieving device. At least a portion of the screen in the second adsorption column is disposed in the second accommodating cavity. In the second accommodating cavity, the air-lifting column, the air-lifting mixing column and the screen are arranged along the horizontal direction.

3. The ion exchange counterflow system of claim 2, wherein, It also includes an intermediate adsorption column, which is located between the first adsorption column and the second adsorption column, and the first adsorption column, the intermediate adsorption column and the second adsorption column are arranged in a stepped manner along the horizontal direction; The intermediate adsorption column has a third accommodating cavity and is provided with a fifth inlet and a sixth inlet communicating with the third accommodating cavity. The third accommodating cavity is used to contain the adsorbent and the slurry mixture. The fifth inlet is communicating with the overflow port in the first adsorption column, and the sixth inlet is communicating with the outlet of the air stripping column in the second adsorption column. The third accommodating cavity is provided with the air-lifting column and the air-lifting mixing column, and the outlet of the air-lifting column in the intermediate adsorption column is connected to the second inlet; The intermediate adsorption column is also provided with the sieving device. The overflow port of the intermediate adsorption column is connected to the third inlet. At least a portion of the screen in the intermediate adsorption column is disposed in the third accommodating cavity. In the third accommodating cavity, the air-lifting column, the air-lifting mixing column and the screen are arranged along the horizontal direction.

4. The ion exchange counterflow system of claim 3, wherein, Also includes: A first storage tank, which is connected to the first inlet to supply slurry to the first adsorption column; A second storage tank is adapted to be connected to the fourth inlet to supply adsorbent to the second adsorption column; The third storage tank is connected to the overflow port in the second adsorption column to recover the slurry after the reaction. The first sieve and the fourth storage tank are connected in sequence to the outlet of the gas stripping column in the first adsorption column, the first sieve and the fourth storage tank, and the fourth storage tank is used to recover the adsorbent after the reaction.

5. The ion exchange counterflow system of claim 4, wherein, The second storage tank is provided with a water inlet and a discharge outlet, wherein the water inlet is located above the discharge outlet in the vertical direction; The countercurrent system also includes a second screen and a fifth storage tank. The discharge port, the second screen and the fourth inlet are connected in sequence. The fifth storage tank is connected to the water inlet to supply water to the discharge port. And / or, the second screen is provided with a liquid outlet, which is connected to the fifth storage tank to recover the transported water.

6. The ion exchange counterflow system according to any one of claims 1 to 5, characterized in that, The sieve is a flat sieve.

7. The ion exchange counterflow system according to any one of claims 3-5, characterized in that, At least a portion of the screen is located above the plane containing the adsorbent and slurry mixture in any one of the first, second, and third accommodating cavities. And / or, the top of at least one of the first adsorption column, the second adsorption column, and the intermediate adsorption column is lower than the top of the corresponding sieve.

8. The ion exchange counterflow system of any one of claims 3-5, wherein, The screening device further includes: Side plates and back plates, the screen, the side plates and the back plates together surround the molded mounting cavity, the back plates are arranged opposite to the screen, and the overflow port is located on the side of the back plates away from the screen; An intermediate plate is connected to the side plate and located within the mounting cavity. The intermediate plate divides the mounting cavity into a first chamber and a second chamber. Any one of the first accommodating cavity, the second accommodating cavity, and the third accommodating cavity is connected to the first chamber through the screen. The second chamber is connected to the overflow port. A base plate is connected to each of the screen, the side plate, and the back plate and closes the bottom opening of the mounting cavity. The bottom end of the intermediate plate is spaced apart from the base plate and defines a flow channel between them. The first chamber, the flow channel, and the second chamber are connected in sequence.

9. The ion exchange counterflow system of claim 8, wherein, The cross-sectional area of ​​the flow guiding channel is smaller than the area of ​​the screen. And / or, the distance between the screen and the intermediate plate is a, the distance between the intermediate plate and the bottom plate is b, and the distance between the intermediate plate and the back plate is c, where a=b=c; And / or, the outer contour of the cross-section of the base plate is an inverted cone or a trapezoid with a larger top and a smaller bottom.

10. The ion exchange countercurrent system according to claim 8, characterized in that, The screen is detachably connected to the side plate.

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