Ion exchange countercurrent system

Abstract

The invention provides an ion exchange countercurrent system, and relates to the technical field of ion exchange.The ion exchange countercurrent system comprises a first adsorption column, a gas stripping lifting column, a gas stripping mixing column and a screening device.The first adsorption column is provided with a first containing cavity and a first inlet communicated with the first containing cavity, and the first containing cavity is used for containing an adsorbent and ore pulp mixed liquid; the first inlet is suitable for feeding ore pulp; the gas stripping lifting column is used for lifting an adsorbent and ore pulp mixed solution from bottom to top so as to discharge the reacted adsorbent and ore pulp mixed solution, and the gas stripping lifting column and the gas stripping mixing column are arranged in the first accommodating cavity; the screening device comprises a screen extending in the vertical direction and is provided with an overflow opening, the first adsorption column is provided with the screening device, at least part of the screen in the first adsorption column is arranged in a first containing cavity, and in the first containing cavity, the gas stripping lifting column, the gas stripping mixing column and the screen are arranged in the horizontal direction. According to the invention, the wear of the screen between the adsorption columns to the adsorbent during screening can be effectively reduced, so that the mass transfer effect of the adsorbent is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of ion exchange, in particular to an ion exchange countercurrent system. Background Art

[0002] Ion adsorption is a common technical means in the fields of wastewater treatment, mineral smelting, element separation, etc. The systems used for ion adsorption are mostly multi-stage fixed-bed systems in series, which cannot be applied to the treatment of impure liquid raw materials (such as ore pulp). In order to achieve the treatment of impure liquid raw materials in related technologies, two structural forms are adopted. One is a countercurrent adsorption system. By setting a linear screen between each stage of reaction columns, the ore pulp material and the adsorbent contact the screen from top to bottom to achieve screening and separation; the other is to use an adsorption tank. The screening device of the adsorption tank is cylindrical, inverted and completely immersed in the ore pulp. After passing through the screen, the ore pulp ascends to the overflow port to achieve screening and separation.

[0003] However, when the above two structural forms are actually used, the adsorbent of the countercurrent adsorption system will frequently rub against the screen, which can easily cause adsorbent wear. After the adsorption tank has been running for a long time, sludge deposits will form inside, which can easily cause the screen cylinder to be blocked, requiring frequent replacement of the screen cylinder, affecting production efficiency. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides an ion exchange countercurrent system, which can effectively reduce the wear of the screen between adsorption columns on the adsorbent during screening, thereby ensuring the mass transfer effect of the adsorbent.

[0006] According to an embodiment of the present invention, an ion exchange countercurrent system includes a first adsorption column, an air stripping lifting column, an air stripping mixing column and a screening device. The first adsorption column has a first accommodating chamber and is provided with a first inlet connected to the first accommodating chamber. The first accommodating chamber is used to accommodate an adsorbent and a slurry mixture, and the first inlet is suitable for introducing slurry; the air stripping lifting column is used to lift the adsorbent and the slurry mixture from bottom to top to discharge the reacted adsorbent and slurry mixture. The first accommodating chamber is provided with the air stripping lifting column and the air stripping mixing column; the screening device includes a screen extending in the up and down directions and is provided with an overflow port, the screen is used to cover the overflow port, the first adsorption column is provided with the screening device, at least part of the screen in the first adsorption column is provided in the first accommodating chamber, and in the first accommodating chamber, the air stripping lifting column, the air stripping mixing column and the screen are arranged in a horizontal direction.

[0007] According to the ion exchange countercurrent system of the embodiment of the present application, the gas stripping mixed column in the first adsorption column mixes the adsorbent and the ore pulp entering the first accommodating cavity sufficiently, so that the adsorbent can well adsorb the target substance in the ore pulp, the gas stripping lift column can lift the mixed solution of the adsorbent and the ore pulp after reaction from bottom to top to discharge the first adsorption column, and the screen is used to intercept the adsorbent and pass the ore pulp after reaction. Since the screen extends in the first accommodating cavity along the vertical direction, that is, the screen is vertically arranged in the first adsorption column, the mixed solution in the first accommodating cavity will be filtered and the adsorbent will be intercepted through the screen along the horizontal direction, and the ore pulp after reaction in the mixed solution will pass through the screen to overflow from the overflow port. The adsorbent discharged from the gas stripping mixed column is dispersed everywhere, and the adsorbent distributed to the direction of the screen only accounts for a small proportion. At the same time, the adsorbent is affected by the horizontal direction, so that the pressure of the adsorbent perpendicular to the screen surface is only a component force of the flow inertial force of the adsorbent. Under the action of the gas stripping, the adsorbent and the ore pulp flow in the gas stripping mixed column and outside the gas stripping mixed column. Therefore, the component force is very small, and the friction caused by the component force is much lower than the friction between the adsorbent flowing from top to bottom and the screen affected by the downward gravity in the related art. Therefore, compared with the related art, the present application can effectively reduce the wear of the adsorbent on the screen between the adsorption columns during screening, so as to ensure the mass transfer effect of the adsorbent.

[0008] In some embodiments, the countercurrent system further comprises a second adsorption column, which is lower than the first adsorption column in the vertical direction, and 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 accommodate the mixed solution of the adsorbent and the ore pulp, the third inlet is capable of communicating with the overflow port in the first adsorption column, and the fourth inlet is adapted to pass into the adsorbent.

[0009] The first adsorption column is further provided with a second inlet communicating with the first accommodating cavity, and the second accommodating cavity is provided with the gas stripping lift column and the gas stripping mixed column. The outlet of the gas stripping lift column in the second adsorption column is capable of communicating with the second inlet.

[0010] The second adsorption column is further provided with the screening device, and at least part of the screen in the second adsorption column is arranged in the second accommodating cavity. In the second accommodating cavity, the gas stripping lift column, the gas stripping mixed column and the screen are arranged along the horizontal direction.

[0011] In some embodiments, the countercurrent system further comprises 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.

[0012] The intermediate adsorption column has a third accommodating chamber and is provided with a fifth inlet and a sixth inlet communicating with the third accommodating chamber. The third accommodating chamber is used to accommodate an adsorbent and a slurry mixture. The fifth inlet is communicated with the overflow port in the first adsorption column, and the sixth inlet is communicated with the outlet of the gas stripping lifting column in the second adsorption column.

[0013] The gas stripping lifting column and the gas stripping mixing column are provided in the third accommodating chamber, and the outlet of the gas stripping lifting column in the intermediate adsorption column is connected to the second inlet;

[0014] The intermediate adsorption column is also provided with the screening device, the overflow port in the intermediate adsorption column is connected to the third inlet, at least part of the screen in the intermediate adsorption column is arranged in the third accommodating chamber, and in the third accommodating chamber, the gas lift column, the gas lift mixing column and the screen are arranged along the horizontal direction.

[0015] 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, wherein the first storage tank is connected to the first inlet to supply slurry to the first adsorption column; the second storage tank is suitable for connecting 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 reaction; the outlet of the gas lift 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 adsorbent after reaction.

[0016] In some embodiments, the first screen is provided with a pulp outlet, and the pulp outlet is communicated with the first accommodating cavity.

[0017] In some embodiments, the second storage tank is provided with a water inlet and a material outlet, and the water inlet is located above the material outlet in the up-down direction;

[0018] The countercurrent system further includes a second screen and a fifth storage tank. The discharge port, the second screen and the fourth inlet are sequentially connected. The fifth storage tank is connected to the water inlet to supply conveying water to the discharge port.

[0019] In some embodiments, the second screen is provided with a liquid outlet, and the liquid outlet is connected to the fifth storage tank to recover the transported water.

[0020] In some embodiments, the screen is a flat screen.

[0021] In some embodiments, at least a portion of the screen is located above the plane where the adsorbent and slurry mixture is located in any one of the first accommodating chamber, the second accommodating chamber, and the third accommodating chamber.

[0022] In some embodiments, a top end of at least one of the first adsorption column, the second adsorption column and the third adsorption column is lower than a top end of the corresponding screen.

[0023] In some embodiments, the screening device further comprises a side plate, a back plate, an intermediate plate and a bottom plate.

[0024] The screen, the side plate and the back plate jointly enclose a forming installation cavity, the back plate is arranged opposite to the screen, and the overflow port is arranged on a side of the back plate away from the screen.

[0025] The intermediate plate is connected with the side plate and located in the installation cavity, the intermediate plate divides the installation 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 communicated with the first chamber through the screen, and the second chamber is communicated with the overflow port.

[0026] The bottom plate is connected with each of the screen, the side plate and the back plate and closes a bottom end opening of the installation cavity, a bottom end of the intermediate plate is spaced apart from the bottom plate, and a flow guide channel is defined between the bottom end of the intermediate plate and the bottom plate, the first chamber, the flow guide channel and the second chamber are sequentially communicated.

[0027] In some embodiments, a cross-sectional area of the flow guide channel is smaller than an area of the screen.

[0028] In some embodiments, a spacing between the screen and the intermediate plate is a, a spacing between the intermediate plate and the bottom plate is b, and a spacing between the intermediate plate and the back plate is c, a = b = c.

[0029] In some embodiments, an outer contour of a cross section of the bottom plate is an inverted conical shape or a trapezoidal shape with a large upper part and a small lower part.

[0030] In some embodiments, the screen and the side plate are detachably connected.

[0031] In some embodiments, the screening device further comprises a chute, the chute is connected with the side plate, there are two chutes and they are arranged on two sides of the screen along a width direction of the screen, and the screen and the chute are slidably connected along the up-down direction.

[0032] In some embodiments, the overflow port extends downwardly and inclines away from the back plate, and a cross-sectional area of the overflow port gradually decreases along an extending direction of the overflow port.

[0033] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of an ion exchange countercurrent system according to an embodiment of the present invention.

[0035] Figure 2 3 is a schematic structural diagram from a first perspective of a screening device in an ion exchange countercurrent system according to an embodiment of the present invention.

[0036] Figure 3 3 is a schematic structural diagram from a second perspective of a screening device in an ion exchange countercurrent system according to an embodiment of the present invention.

[0037] Figure 4 yes Figure 3 Schematic diagram of the locally enlarged structure at point A in the middle.

[0038] Reference numerals:

[0039] 1. First adsorption column; 11. First accommodating chamber; 12. First inlet; 13. Second inlet;

[0040] 2. Gas lift column;

[0041] 3. Gas stripping mixing column;

[0042] 4. Screening device; 41. Screen; 42. Overflow port; 43. Side panel; 44. Back panel; 45. Middle panel; 46. Bottom panel; 47. Mounting cavity; 471. First chamber; 472. Second chamber; 48. Diversion channel; 49. Chute;

[0043] 5. Second adsorption column; 51. Second accommodating chamber; 52. Third inlet; 53. Fourth inlet;

[0044] 6. Middle adsorption column; 61. Third accommodating chamber; 62. Fifth inlet; 63. Sixth inlet;

[0045] 7. Overflow valve;

[0046] 8. First storage tank; 81. Second storage tank; 811. Water inlet; 812. Discharge port; 82. Third storage tank; 83. First screen; 831. Slurry discharge port; 84. Fourth storage tank;

[0047] 9. Second screen; 91. Fifth storage tank; 92. Liquid outlet. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0049] like Figure 1As shown, an ion exchange countercurrent system according to an embodiment of the present invention includes a first adsorption column 1, an air stripping lifting column 2, an air stripping mixing column 3 and a screening device 4. The first adsorption column 1 has a first accommodating chamber 11 and is provided with a first inlet 12 connected to the first accommodating chamber 11. The first accommodating chamber 11 is used to accommodate an adsorbent and a slurry mixture, and the first inlet 12 is suitable for introducing slurry; the air stripping lifting column 2 is used to lift the adsorbent and the slurry mixture from bottom to top to discharge the reacted adsorbent and slurry mixture. The first accommodating chamber 11 is provided with an air stripping lifting column 2 and an air stripping mixing column 3; the screening device 4 includes a screen 41 extending in the up and down 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 a screening device 4. At least a portion of the screen 41 in the first adsorption column 1 is provided in the first accommodating chamber 11. In the first accommodating chamber 11, the air stripping lifting column 2, the air stripping mixing column 3 and the screen 41 are arranged horizontally.

[0050] According to the ion exchange countercurrent system of the embodiment of the present invention, the gas stripping mixing column 3 in the first adsorption column 1 fully mixes the adsorbent and the slurry entering the first accommodating chamber 11, so that the adsorbent can well adsorb the target substance in the slurry. The gas stripping lifting column 2 can lift the reacted adsorbent and slurry mixture from bottom to top to discharge the first adsorption column 1, and the screen 41 is used to intercept the adsorbent and pass the reacted slurry. Because the screen 41 extends in the up and down directions in the first accommodating chamber 11, that is, the screen 41 is arranged vertically in the first adsorption column 1, the mixed liquid in the first accommodating chamber 11 will be filtered by the screen 41 in the horizontal direction to intercept the adsorbent, and the reacted slurry in the mixed liquid will pass through the screen 41 into the overflow port. 42 overflows, and the adsorbent discharged from the air stripping mixing column 3 is dispersed everywhere, and the adsorbent distributed to the screen 41 direction accounts for only a small proportion. At the same time, this part of the adsorbent is affected by the horizontal direction, so 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 stripping, the adsorbent and the slurry circulate gently inside and outside the air stripping mixing column 3. Therefore, the aforementioned component force is very small, and the friction force caused by it is much lower than the friction force generated between the adsorbent and the screen 41 when it flows from top to bottom under the influence of downward gravity in the related art. Therefore, compared with the related art, the present invention 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.

[0051] Specifically, the first adsorption column 1, the first accommodating chamber 11, the air stripping column 2 and the air stripping mixing column 3 can all extend in the vertical direction. The first inlet 12 can be opened on the side wall of the first adsorption column 1. The second inlet 13 can be opened at the top of the first adsorption column 1. The air stripping mixing column 3 is used to fully mix the adsorbent and the ore pulp. The air stripping column 2 can lift the adsorbent and ore pulp mixture from bottom to top by the air passing through it, and the air stripping mixing column 3 can promote the adsorbent and ore pulp to be fully mixed by the air passing through it. The specific structure and working principle of the air stripping column 2 and the air stripping mixing column 3 can adopt the existing technology in the field and will not be repeated here. The inlet of the air stripping column 2 and the inlet of the air stripping mixing column 3 are both immersed in the mixed liquid and separated from the bottom end of the first accommodating chamber 11. The outlet of the air stripping column 2 can pass through the top of the first adsorption column 1, and the outlet of the air stripping mixing column 3 can be located in the first accommodating chamber 11. The screen 41 extends in the vertical direction, that is, the screen 41 is arranged in a vertical state so that the screen 41 can filter the mixed liquid in the horizontal direction. In the first accommodating chamber 11, the air stripping lifting column 2, the air stripping mixing column 3, the screen 41 and the overflow port 42 can be arranged in sequence in the horizontal direction.

[0052] It should be noted that the adsorbent (such as resin) is mixed with the slurry to react and absorb and separate the target substance in the slurry, so that the target substance in the slurry can be recovered through the adsorbent. For example, the ion exchange resin (i.e., adsorbent) is directly in contact with the solid-containing slurry, and the target substance in the liquid phase of the slurry is adsorbed onto the resin. After multi-stage adsorption or screening of the resin, and desorption of the resin, the target substance enriched liquid can be obtained.

[0053] In addition, in the related art, when the mixed liquid after the reaction is filtered, the mixed liquid often flows from top to bottom, the slurry in the mixed liquid passes through the screen 41, and the adsorbent in the mixed liquid is intercepted by the screen 41. In this process, the adsorbent is affected by the downward gravity, and there must be a certain friction between the adsorbent and the screen 41, which is easy to wear the adsorbent, thereby affecting the mass transfer effect of the adsorbent.

[0054] 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 facilitates the flow of the reacted mixed liquid to the upper adsorption column. The second adsorption column 5 has a second accommodating chamber 51 and is provided with a third inlet 52 and a fourth inlet 53 connected to the second accommodating chamber 51. The second accommodating chamber 51 is used to accommodate the adsorbent and slurry mixture. The third inlet 52 can be connected to the overflow port 42 in the first adsorption column 1, and the fourth inlet 53 is suitable for introducing the adsorbent.

[0055] The first adsorption column 1 is further provided with a second inlet 13 communicating with the first accommodating chamber 11 . The second accommodating chamber 51 is provided with an air stripping lifting column 2 and an air stripping mixing column 3 . The outlet of the air stripping lifting column 2 in the second adsorption column 5 can be communicated with the second inlet 13 .

[0056] The second adsorption column 5 is further provided with a screening device 4. At least part of the screen 41 in the second adsorption column 5 is arranged in the second accommodating chamber 51. In the second accommodating chamber 51, the gas lift column 2, the gas lift mixing column 3 and the screen 41 are arranged in the horizontal direction.

[0057] It can be understood that a two-stage adsorption and filtration structure is formed by cooperating with the first adsorption column 1 and the second adsorption column 5, which can improve the extraction effect of the countercurrent system on the target substance in the ore pulp, and because the flow direction of the raw ore pulp and the flow direction of the raw material adsorbent in the two-stage adsorption and filtration structure are opposite, that is, the raw ore pulp is injected from the first adsorption column 1 to flow into the second adsorption column 5, and the raw material adsorbent is injected from the second adsorption column 5 and flows into the first adsorption column 1, so the adsorption efficiency of the adsorbent on the target substance in the ore pulp can be fully guaranteed. At the same time, the coordinated structural arrangement of the air lift column 2, the air lift mixing column 3 and the screen 41 of each of the first adsorption column 1 and the second adsorption column 5 also reduces the wear of the screen 41 between the adsorption columns on the adsorbent.

[0058] Specifically, the arrangement of the gas stripping lifting column 2, gas stripping mixing column 3, and screen 41 within the second accommodating chamber 51 of the second adsorption column 5 can be the same as that of the first adsorption column 1 described above. The third inlet 52 can be provided on the sidewall of the second adsorption column 5. The fourth inlet 53 can be provided at the top of the second adsorption column 5. The overflow port 42 in the first adsorption column 1 is higher in the vertical direction than the third inlet 52.

[0059] 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, and 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 conducive to the flow of the mixed liquid after the reaction to the upper adsorption column.

[0060] The intermediate adsorption column 6 has a third accommodating chamber 61 and is provided with a fifth inlet 62 and a sixth inlet 63 connected to the third accommodating chamber 61. The third accommodating chamber 61 is used to accommodate the adsorbent and 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 gas lift column 2 in the second adsorption column 5.

[0061] The third accommodating cavity 61 is provided with the air stripping lifting column 2 and the air stripping mixing column 3, and the outlet of the air stripping lifting column 2 in the intermediate adsorption column 6 is communicated with the second inlet 13.

[0062] The intermediate adsorption column 6 is further provided with the screening device 4, the overflow port 42 in the intermediate adsorption column 6 is communicated with the third inlet 52, and at least part of the screen 41 in the intermediate adsorption column 6 is arranged in the third accommodating cavity 61. In the third accommodating cavity 61, the air stripping lifting column 2, the air stripping mixing column 3 and the screen 41 are arranged along the horizontal direction.

[0063] It can be understood that the first adsorption column 1, the intermediate adsorption column 6 and the second adsorption column 5 cooperatively form a three-stage adsorption filtering structure, which can further optimize the extraction effect of the countercurrent system on the target substance in the ore slurry, and the same as the above two-stage adsorption filtering structure, the adsorption efficiency of the adsorbent on the target substance in the ore slurry can be fully ensured, and the wear of the screen 41 between the adsorption columns on the adsorbent is reduced.

[0064] Specifically, the arrangement mode of the air stripping lifting column 2, the air stripping mixing column 3 and the screen 41 in the intermediate adsorption column 6 in the third accommodating cavity 61 can be the same as the arrangement mode in the first adsorption column 1. The fifth inlet 62 can be arranged on the side wall of the intermediate adsorption column 6. The sixth inlet 63 can be arranged at the top end 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.

[0065] As shown in FIG. 1, Figure 1 In some embodiments, the intermediate adsorption column 6 has a plurality of intermediate adsorption columns 6, the first adsorption column 1, all the 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 communicated with the fifth inlet 62 of the adjacent intermediate adsorption column 6, and the sixth inlet 63 of any intermediate adsorption column 6 is communicated with the outlet of the air stripping lifting column 2 in the adjacent intermediate adsorption column 6.

[0066] The outlet of the air stripping lifting column 2 in the intermediate adsorption column 6 adjacent to the first adsorption column 1 is communicated with the second inlet 13, the fifth inlet 62 of the intermediate adsorption column 6 adjacent to the first adsorption column 1 is communicated with 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 communicated with the outlet of the air stripping lifting column 2 in the second adsorption column 5, and the overflow port 42 in the intermediate adsorption column 6 adjacent to the second adsorption column 5 is communicated with the third inlet 52.

[0067] It can be understood that the above structure design forms a multi-stage adsorption filtering structure, which can maximize the extraction effect of the countercurrent system on the target substance in the ore slurry.

[0068] Specifically, the overflow port 42 in the intermediate adsorption column 6 of the previous stage is vertically higher than the fifth inlet 62 of the intermediate adsorption column 6 of the next stage. Relief valves 7 may be installed 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 in any intermediate adsorption column 6 and the fifth inlet 62 of the adjacent intermediate adsorption column 6, and between the overflow port 42 and the third inlet 52 in the intermediate adsorption column 6 adjacent to the second adsorption column 5. The hydraulic pressure is controlled by the interstage relief valves 7 to stabilize the overflow flow rate of each adsorption column.

[0069] 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 the first inlet 12 to supply slurry to the first adsorption column 1; the second storage tank 81 is suitable for connecting to the fourth inlet 53 to supply adsorbent to the second adsorption column 5; the third storage tank 82 is connected to the overflow port 42 in the second adsorption column 5 to recover the slurry after reaction; the outlet of the gas lift 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.

[0070] It can be understood that the above structural design can realize the separate recovery of the post-reaction slurry and the post-reaction adsorbent, further improving the overall performance of the countercurrent system.

[0071] Specifically, the first storage tank 8 can supply the raw slurry to the first inlet 12 through a delivery pump. The second storage tank 81 can be higher than the second adsorption column 5 in the vertical direction, so that the raw adsorbent in the second storage tank 81 can be automatically supplied to the fourth inlet 53 under the action of 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 the reaction can be automatically recovered to the third storage tank 82 under the action of gravity. The height of the outlet of the gas lift column 2 in the first adsorption column 1, the height of the first screen 83 (also known as the tail screen), and the height of the fourth storage tank 84 can decrease in sequence. The first screen 83 can be a slanted screen, which is used to filter and intercept the adsorbent after the reaction.

[0072] like Figure 1 As shown, in some embodiments, the first screen 83 is provided with a slurry outlet 831, and the slurry outlet 831 is connected to the first accommodating chamber 11, so that the mixed liquid lifted and discharged by the gas lift column 2 in the first adsorption column 1 can be screened by the first screen 83, and the screened slurry can be returned to the first accommodating chamber 11, thereby ensuring efficient extraction of the target substance in the slurry.

[0073] like Figure 1 As shown, in some embodiments, the second storage tank 81 is provided with a water inlet 811 and a discharge port 812 , and the water inlet 811 is located above the discharge port 812 in the up and down directions.

[0074] The countercurrent system further 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 .

[0075] It can be understood that when the raw adsorbent is conveyed by gravity from the second storage tank 81 (i.e., the high-level tank), in order to avoid blockage of the discharge port 812, the raw adsorbent can be conveyed through water above the discharge port 812, that is, a water inlet 811 is opened on the lower end side of the second storage tank 81, and the conveying water is supplied to the inlet water by the fifth storage tank 91, and then the conveying water is separated by the second screen 9 (i.e., the first screen), so that the adsorbent can smoothly enter the second adsorption column 5.

[0076] Specifically, the fifth storage tank 91 can deliver water to the water inlet 811 through a delivery pump. The height of the discharge port 812, the height of the second screen 9 and the height of the fourth inlet 53 can decrease in sequence.

[0077] 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 recycle the transported water, thereby achieving reuse of the transported water and saving water resources. The liquid outlet 92 is located above the fifth storage tank 91 in the vertical direction.

[0078] like Figure 2 and Figure 3 As shown, in some embodiments, the screen 41 is a flat screen. The use of a flat screen structure can reduce the difficulty of manufacturing spare parts for the countercurrent system.

[0079] like Figure 1 As shown, in some embodiments, at least a portion of the screen 41 is located above the plane where the adsorbent and the ore-slurry mixture are located in any one of the first accommodating chamber 11, the second accommodating chamber 51 and the third accommodating chamber 61. In other words, at least a portion of the screen 41 in the first adsorption column 1 is located above the plane where the adsorbent and the ore-slurry mixture are located in the first accommodating chamber 11, at least a portion of the screen 41 in the second adsorption column 5 is located above the plane where the adsorbent and the ore-slurry mixture are located in the second accommodating chamber 51, and at least a portion of the screen 41 in the third adsorption column is located above the plane where the adsorbent and the ore-slurry mixture are located in the third accommodating chamber 61.

[0080] It can be understood that the above-mentioned structural design allows the screen 41 vertically arranged in the corresponding accommodating cavity to be half 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 beneficial to promoting the screening effect and realizing self-adjustment of the screening area, thereby reducing the replacement frequency of the screen 41 and improving production efficiency.

[0081] 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 third adsorption column is lower than the top of the corresponding screen 41. In other words, the top of the first adsorption column 1 is lower than the top of the screen 41 in the first adsorption column 1; or, the top of the second adsorption column 5 is lower than the top of the screen 41 in the second adsorption column 5; or, the top of the third adsorption column is lower than the top of the screen 41 in the third 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 screens 41; or, the top of the first adsorption column 1 and the top of the third adsorption column are both lower than the top of their respective screens 41; or, the top of the second adsorption column 5 and the top of the third adsorption column are both lower than the top of their respective screens 41; or, the top of each of the first adsorption column 1, the second adsorption column 5 and the third adsorption column is lower than the top of their respective screens 41.

[0082] It is understandable that making the top of the screen 41 higher than the corresponding adsorption column is conducive to the later replacement operation of the screen 41. Compared with the relevant technology, there is no need to manually enter the adsorption column to replace the screen 41, which is convenient to operate.

[0083] like Figure 2 and Figure 3 As shown, in some embodiments, the screening device 4 further includes side plates 43 , a back plate 44 , a middle plate 45 and a bottom plate 46 .

[0084] The screen 41 , the side panels 43 and the back panel 44 together surround the molded mounting cavity 47 . The back panel 44 and the screen 41 are arranged opposite to each other. The overflow port 42 is provided on a side of the back panel 44 away from the screen 41 .

[0085] Among them, the middle plate 45 is connected to the side plate 43 and is located in the installation cavity 47. The middle plate 45 divides the installation cavity 47 into a first chamber 471 and a second chamber 472. Any one of the first accommodating chamber 11, the second accommodating chamber 51 and the third accommodating chamber 61 is connected to the first chamber 471 through the screen 41, and the second chamber 472 is connected to the overflow port 42.

[0086] Among them, the bottom plate 46 is connected to each of the screen 41, the side plate 43 and the back plate 44 and closes the bottom opening of the installation cavity 47. The bottom end of the middle plate 45 is separated from the bottom plate 46 and a guide channel 48 is defined between the two. The first chamber 471, the guide channel 48 and the second chamber 472 are connected in sequence.

[0087] It can be understood that the intermediate plate 45 in the installation cavity 47 can guide the slurry, so that the slurry passing through the screen 41 must pass through the diversion channel 48 before reaching the overflow port 42, which greatly enhances the disturbance effect inside the screening device 4. Compared with the relevant technology, it effectively alleviates the problem of sludge deposition, and this structural method does not require additional power equipment such as stirring, and will not increase additional power consumption.

[0088] For example, as shown in the figure, there may be two side panels 43. In this case, both the first chamber 471 and the second chamber 472 are flat spaces.

[0089] 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 flow rate multiplied by the area of ​​the screen 41, and 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 lower flow rate. When the slurry passes through the guide channel 48, the cross-sectional area becomes smaller, and the slurry of the same flow rate will pass through at a higher flow rate, so a disturbance effect can be achieved. At the same time, because 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, when the slurry continues to flow upward, the slurry can maintain a higher flow rate to prevent the sludge from settling.

[0090] Specifically, the cross section of the flow guiding channel 48 is perpendicular to the horizontal direction.

[0091] like Figure 2 and Figure 3 As shown, in some embodiments, the distance between the screen 41 and the middle plate 45 is a, the distance between the middle plate 45 and the bottom plate 46 is b, and the distance between the middle plate 45 and the back plate 44 is c, a=b=c. In other words, the distance from the screen 41 to the middle plate 45, the distance from the bottom end of the middle plate 45 to the bottom plate 46, and the distance from the middle plate 45 to the back plate 44 are similar, so that the slurry can pass smoothly at a suitable speed (such as 1.5-3m / s). If the distance is too large, the slurry flow rate is too slow, which will cause sludge deposition; if the distance is too small, the slurry flow rate is difficult to be very large due to the limitation of the slurry viscosity, which will limit the slurry flow rate and thus affect the processing capacity of the countercurrent system.

[0092] 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 upper portion and a smaller lower portion, so as to further enhance the disturbance effect inside the screening device 4 and prevent the sedimentation of ore slime.

[0093] like Figures 2 to 4 As shown, in some embodiments, the screen 41 and the side panel 43 are detachably connected to facilitate the later disassembly and maintenance of the screen 41. At the same time, when one of the two connected parts is damaged and fails, it is only necessary to replace the corresponding damaged part to achieve the normal operation of the screening device 4 without scrapping the entire screening device 4, further effectively reducing the maintenance cost of the screening device 4.

[0094] 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 chutes 49, which are arranged on both sides of the screen 41 along its width direction. The screen 41 is slidably connected to the chute 49 in the up and down directions.

[0095] It can be understood that the screen 41 can be inserted and replaced in the screening device 4 through the chute 49, and because 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, and the operation is simple and easy.

[0096] like Figures 1 to 3 As shown, in some embodiments, the overflow port 42 extends downwardly and away from the back plate 44, and the cross-sectional area of ​​the overflow port 42 gradually decreases along its extension direction. For example, taking the figure as an example, the front end of the overflow port 42 is wide and the rear end is narrowed. This structural design facilitates the smooth entry of the slurry into the overflow port 42 and allows the slurry to enter the next-stage adsorption column at a higher flow rate.

[0097] Therefore, compared with the related art, the present invention has the following advantages:

[0098] 1) By installing the interstage screen 41 vertically, the countercurrent system as a whole reduces the wear between the adsorbent and the screen 41;

[0099] 2) Strengthening the disturbance inside the screening device 4 can prevent the sedimentation of ore slime;

[0100] 3) The screen 41 is half immersed in the corresponding accommodating cavity, which enables the screening area to have a self-adjusting function, reduces the replacement frequency of the screen 41, and improves production efficiency;

[0101] 4) The top of the screen 41 is higher than the corresponding adsorption column, and the replacement method is a plug-in method, which is easy to operate. At the same time, the screen 41 can be a flat screen, which makes the spare part manufacturing simple.

[0102] Now, in combination with the specific structure of the countercurrent system, its working process is described. Specifically, after the slurry is pumped from the first storage tank 8 into the first adsorption column 1, it overflows step by step. The hydraulic pressure is controlled by the overflow valve 7 between the stages to stabilize the overflow flow of each adsorption column, and the adsorbent is transported from the second storage tank 81 (i.e., the high-level tank) by gravity. In order to avoid blockage, water is transported from the lower end side of the second storage tank 81, and then the transported water is separated by the second screen 9 (i.e., the first screen), so that the adsorbent enters the fourth inlet 53 of the second adsorption column 5, and the transported water is reused. At the same time, two streams of air are introduced into each adsorption column. One stream enters the air stripping mixing column 3 to fully mix the adsorbent and the slurry to promote the adsorption reaction, and the other stream enters the air stripping lifting column 2 to lift the adsorbent and the slurry to a high place together and enter the upper 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 the slurry. The screened adsorbent enters the fourth storage tank 84, and the slurry returns to the first adsorption column 1.

[0103] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0104] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0105] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0106] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0108] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An ion exchange countercurrent system, characterized in that: include: a first adsorption column, the first adsorption column having a first accommodating chamber and a first inlet communicating with the first accommodating chamber, the first accommodating chamber being used to accommodate an adsorbent and a slurry mixture, the first inlet being suitable for admitting the slurry; An air stripping lifting column and an air stripping mixing column, wherein the air stripping lifting column is used to lift the adsorbent and slurry mixture from bottom to top to discharge the adsorbent and slurry mixture after the reaction, and the air stripping lifting column and the air stripping mixing column are arranged in the first accommodating chamber; A screening device, the screening device includes a screen extending in the up and down direction and is provided with an overflow port, the screen is used to cover the overflow port, the first adsorption column is provided with the screening device, at least part of the screen in the first adsorption column is provided in the first accommodating chamber, and in the first accommodating chamber, the gas lift column, the gas lift mixing column and the screen are arranged in a horizontal direction.

2. The ion exchange countercurrent system according to claim 1, characterized in that: The device further includes a second adsorption column, the second adsorption column being lower than the first adsorption column in the vertical direction, the second adsorption column having a second accommodating chamber and provided with a third inlet and a fourth inlet communicating with the second accommodating chamber, the second accommodating chamber being used to accommodate an adsorbent and a slurry mixture, the third inlet being communicable with the overflow port in the first adsorption column, and the fourth inlet being suitable for admitting adsorbent; The first adsorption column is further provided with a second inlet communicating with the first accommodating chamber, the second accommodating chamber is provided with the gas stripping lifting column and the gas stripping mixing column, and the outlet of the gas stripping lifting column in the second adsorption column can be communicated with the second inlet; The second adsorption column is further provided with the screening device, and at least part of the screen in the second adsorption column is arranged in the second accommodating chamber. In the second accommodating chamber, the gas stripping lifting column, the gas stripping mixing column and the screen are arranged along the horizontal direction.

3. The ion exchange countercurrent system according to claim 2, characterized in that: It also includes an intermediate adsorption column, the intermediate adsorption column 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 chamber and is provided with a fifth inlet and a sixth inlet communicating with the third accommodating chamber. The third accommodating chamber is used to accommodate an adsorbent and a slurry mixture. The fifth inlet is communicated with the overflow port in the first adsorption column, and the sixth inlet is communicated with the outlet of the gas stripping lifting column in the second adsorption column. The gas stripping lifting column and the gas stripping mixing column are provided in the third accommodating chamber, and the outlet of the gas stripping lifting column in the intermediate adsorption column is connected to the second inlet; The intermediate adsorption column is also provided with the screening device, the overflow port in the intermediate adsorption column is connected to the third inlet, at least part of the screen in the intermediate adsorption column is arranged in the third accommodating chamber, and in the third accommodating chamber, the gas lift column, the gas lift mixing column and the screen are arranged along the horizontal direction.

4. The ion exchange countercurrent system according to claim 3, characterized in that: Also includes: a first storage tank, the first storage tank being in communication with the first inlet for supplying slurry to the first adsorption column; a second storage tank adapted to communicate with the fourth inlet to supply adsorbent to the second adsorption column; a third storage tank, the third storage tank being connected to the overflow port in the second adsorption column to recover the reacted slurry; The first sieve and the fourth storage tank, the outlet of the gas stripping lifting column in the first adsorption column, the first sieve and the fourth storage tank are connected in sequence, and the fourth storage tank is used to recover the adsorbent after reaction.

5. The ion exchange countercurrent system according to claim 4, characterized in that: The second storage tank is provided with a water inlet and a material outlet, wherein the water inlet is located above the material outlet in the up-down direction; The countercurrent system further includes a second screen and a fifth storage tank, the discharge port, the second screen and the fourth inlet are sequentially connected, and the fifth storage tank is connected to the water inlet to supply conveying water to the discharge port; And / or, the second screen is provided with a liquid outlet, and the liquid outlet is connected to the fifth storage tank to recover the transported water.

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

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

8. The ion exchange countercurrent system according to any one of claims 3 to 5, characterized in that: The screening device further comprises: A side plate and a back plate, wherein the screen, the side plate and the back plate together surround the molded mounting cavity, the back plate and the screen are arranged opposite to each other, and the overflow port is arranged on a side of the back plate away from the screen; an intermediate plate connected to the side plates and located in the installation cavity, the intermediate plate dividing the installation cavity into a first chamber and a second chamber, any one of the first accommodating chamber, the second accommodating chamber, and the third accommodating chamber being in communication with the first chamber through the screen, and the second chamber being in communication with the overflow port; A bottom plate is connected to each of the screen, the side plate and the back plate and closes the bottom opening of the installation cavity, the bottom end of the intermediate plate is spaced apart from the bottom plate and a guide channel is defined therebetween, the first chamber, the guide channel and the second chamber are connected in sequence.

9. The ion exchange countercurrent system according to claim 8, characterized in that: The cross-sectional area of ​​the diversion channel is smaller than the area of ​​the screen; And / or, the distance between the screen and the middle plate is a, the distance between the middle plate and the bottom plate is b, and the distance between the middle plate and the back plate is c, a=b=c; And / or, the outer contour of the cross section of the bottom plate is an inverted cone or a trapezoid with a larger upper portion and a smaller lower portion.

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

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