A multi-stage extraction device dedicated to the production of tantalum-niobium compounds

Abstract

The present invention discloses a multi-stage extraction device dedicated to the production of tantalum-niobium compounds, which relates to the field of extraction devices and includes a mixing tank and a separation tank. The discharge port of the mixing tank is communicated with the feed port of the separation tank. A light-phase outlet is provided at the bottom of the separation tank. A chamber body is coaxially arranged at the bottom of the separation tank and is communicated with the inner cavity of the separation tank. A first opening is formed on the circumferential side of the chamber body. A separation device is arranged in the chamber body. The separation device includes a top plate, a bottom plate and a sealing plate. For the multi-stage extraction device dedicated to the production of tantalum-niobium compounds, by arranging the chamber body and the separation device, part of the liquid at the two-phase boundary position can be collected into the chamber body, making it purer during the separation process of the extraction phase and the raffinate phase. The liquid collected by the chamber body can be collected and then subjected to centralized secondary separation, avoiding the problem of incomplete separation caused by the unstable state of the boundary position during the two-phase separation, reducing the operation risk brought by the interface fluctuation, and ensuring that the entire extraction process is safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the technology of extraction devices, and particularly to a multi-stage extraction device dedicated to the production of tantalum and niobium compounds. Background Art

[0002] The extraction of tantalum and niobium compounds is an important part in the production process of tantalum and niobium products. Before extraction, the tantalum and niobium ore is first acid-digested to obtain a tantalum and niobium ore pulp. Then, the ore pulp is subjected to an extraction operation. During extraction, it is first mixed completely with the extraction phase (organic phase, mainly secondary octanol). The principle is mainly that the organic phase loads tantalum and niobium. The mixed liquid is transported to a container for static separation. After collecting the organic phase containing tantalum and niobium, further subsequent extraction is carried out;

[0003] However, since the liquid at the interface may be in a relatively unstable state, it is easy to have partial mixing of the two phases, incomplete phase separation, or it takes a long time to achieve relatively complete phase separation. As a result, it is difficult to separate the two phases completely during the separation process, and cross-contamination often occurs during the separation process, such as the presence of the organic phase in the aqueous phase or the presence of the aqueous phase in the organic phase, which easily interferes with the subsequent extraction process. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-stage extraction device dedicated to the production of tantalum and niobium compounds to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A multi-stage extraction device dedicated to the production of tantalum and niobium compounds, including a mixing tank and a separation tank. The discharge port of the mixing tank is connected to the feed port of the separation tank. A light phase outlet is provided at the bottom of the separation tank. This multi-stage extraction device dedicated to the production of tantalum and niobium compounds further includes:

[0006] A silo body, which is coaxially arranged at the bottom of the separation tank and is connected to the inner cavity of the separation tank. A first opening is provided on the circumferential side of the silo body;

[0007] A separation device, which is arranged in the silo body. The separation device includes a top plate, a bottom plate and a sealing plate. The separation device can move axially along the silo body and has a first state, a second state and a third state;

[0008] In the first state, the top plate is located at the top of the silo body and divides the silo body and the separation tank;

[0009] In the second state, the top plate is located above the silo body, and the sealing plate moves above the first opening, so that a first flow channel connecting the inner cavity of the separation tank and the outside of the first opening is formed in the silo body;

[0010] In the third state, the sealing plate moves downward to close the first opening;

[0011] When the separation device switches from the third state to the first state, the liquid at the boundary position between the heavy phase and the light phase is collected into the cavity of the bin.

[0012] The longitudinal section of the bottom plate is in the shape of a "frustum of a cone". In the second state, the top edge of the bottom plate is flush with the lower edge of the first opening.

[0013] A bottom cover is fixedly connected to the bottom of the separation tank. The bottom cover and the bottom of the separation tank and the surface of the bin form a sealed transition cavity. In the second state, the first flow channel communicates with the transition cavity. A heavy-phase outlet is arranged on one side of the transition cavity, and a filter screen is arranged near the heavy-phase outlet in the transition cavity.

[0014] Further, in the third state, the top plate moves downward synchronously to reduce the distance between the top plate and the top of the bin.

[0015] Further, the bottom plate can axially move relative to the top plate along the bin to a fourth state where it abuts against the top plate. A second opening is provided at the top of the top plate, and a one-way valve is arranged at the second opening. The one-way valve only allows the liquid to flow from the cavity of the bin to the inner cavity of the separation tank.

[0016] Further, the special multi-stage extraction device for the production of tantalum-niobium compounds further includes a driving device. The driving device includes a first driving member for driving the movement of the top plate, a second driving member for driving the movement of the bottom plate, and a third driving member for driving the movement of the sealing plate. The first driving member is connected to a first shaft rod. One end of the first shaft rod is fixedly connected to the bottom of the top plate. The second driving member is connected to a second shaft rod. The second shaft rod is fixedly connected to the bottom of the bottom plate. The second shaft rod is slidably connected to the inner wall of the bin. The first shaft rod and the second shaft rod are coaxially arranged, and the first shaft rod penetrates through the second shaft rod and is movably connected to the second shaft rod.

[0017] Further, the second driving member includes a threaded shaft. The threaded shaft is rotatably connected to the surface of the first shaft rod. The threaded shaft is threadedly connected to the inner wall of the second shaft rod. The bottom of the threaded shaft is connected to a B driving member for driving its rotation. The B driving member is installed on one side of the first driving member and moves synchronously with the first shaft rod.

[0018] Further, the third driving member includes a guide plate installed at the bottom of the sealing plate. The guide plate is slidably connected to the inner wall of the bottom plate. A limiting groove is provided on one side of the guide plate close to the inner wall of the bin. A limiting block is fixedly connected to the inner wall of the bin. The limiting block is slidably connected to the limiting groove.

[0019] Further, a clamping member is arranged inside the bottom plate. The clamping member includes a cylindrical groove opened axially in the bottom plate. A clamping ball is slidably connected in the cylindrical groove. A spring is installed between the clamping ball and the cylindrical groove. The elastic force of the spring acts on the clamping ball so that the clamping ball has a tendency to move away from the axis of the bottom plate. A plurality of ball grooves are provided on one side of the guide plate, and the depth of the ball grooves is smaller than the radius of the clamping ball.

[0020] Furthermore, multiple mixing tanks and separation tanks are provided, and at least one mixing tank is connected to one or more separation tanks.

[0021] Compared with the prior art, a multi-stage extraction device dedicated to the production of tantalum-niobium compounds provided by the present invention has the following beneficial effects:

[0022] In the multi-stage extraction device dedicated to the production of tantalum-niobium compounds, by providing a chamber body and a separation device, part of the liquid at the two-phase boundary position can be collected into the chamber body, making the separation between the extraction phase and the raffinate phase purer. The liquid collected in the chamber body can be collected and then subjected to centralized secondary separation, avoiding the problem of incomplete separation caused by the unstable state of the boundary position during the two-phase separation, reducing the operation risk brought by the interface fluctuation, and ensuring that the entire extraction process is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the overall structure of the separation tank of the multi-stage extraction device dedicated to the production of tantalum-niobium compounds provided by the embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the partial longitudinal section structure of the separation tank provided by the embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the partial structure when the separation device moves to the second state in the longitudinal section state of the chamber body and the separation tank provided by the embodiment of the present invention;

[0027] Figure 4 Provided by the embodiment of the present invention Figure 3 Enlarged view of part A;

[0028] Figure 5 Schematic diagram of the first flow channel formed when the separation device is in the second state provided by the embodiment of the present invention;

[0029] Figure 6 Flow chart when the separation device provided by the embodiment of the present invention switches between the first state (diagram a in the figure), the second state (diagram b in the figure), and the third state (diagram c in the figure);

[0030] Figure 7 Schematic diagram of the state when the bottom plate moves to fit the bottom of the top plate provided by the embodiment of the present invention.

[0031] Description of the reference numerals:

[0032] 1. Separation tank; 11. Feed inlet; 12. Light phase outlet; 2. Silo body; 21. First opening; 3. Separation device; 31. Top plate; 32. Bottom plate; 33. Sealing plate; 34. Second opening; 35. Gas passage; 4. Driving device; 41. First driving member; 411. Connecting plate; 412. A driving member; 42. Second driving member; 421. Threaded shaft; 422. B driving member; 4221. First gear; 4222. Second gear; 4223. Motor; 423. Bracket; 43. Third driving member; 431. Guide plate; 432. Limit groove; 433. Limit block; 434. Cylindrical groove; 435. Snap ball; 436. Spring; 437. Ball groove; 44. First shaft rod; 45. Second shaft rod; 5. Bottom cover; 51. Heavy phase outlet; 6. Transition cavity. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] For the embodiments, please refer to Figure 1 - Figure 7 , a multi-stage extraction device dedicated to the production of tantalum-niobium compounds, including a mixing tank (not shown in the figure) and a separation tank 1. The mixing tank is used to fully stir and mix the tantalum-niobium ore pulp to be extracted and the organic phase. The extraction mechanism will not be elaborated here. After mixing for a certain period of time, the mixed-phase liquid is transported to the separation tank 1 for static stratification. The organic phase loaded with tantalum and niobium is separated from the raffinate phase. The discharge port of the mixing tank is connected to the feed inlet 11 of the separation tank 1. A light phase outlet 12 is provided at the bottom of the separation tank 1. After heavy phase separation, the light phase liquid flows out from the light phase outlet 12. This extraction device further includes:

[0035] A silo body 2, which is coaxially arranged at the bottom of the separation tank 1 and is connected to the inner cavity of the separation tank 1. A first opening 21 is provided on the circumferential side of the silo body 2;

[0036] A separation device 3, which is arranged in the silo body 2. The separation device 3 includes a top plate 31, a bottom plate 32 and a sealing plate 33. The separation device 3 can move along the axial direction of the silo body 2 and has a first state, a second state and a third state;

[0037] In the first state, the top plate 31 is located at the top of the silo body 2 and divides the silo body 2 and the separation tank 1;

[0038] In the second state, the top plate 31 is located above the silo body 2, and the sealing plate 33 moves above the first opening 21, so that a first flow path connecting the inner cavity of the separation tank 1 and the outside of the first opening 21 is formed in the silo body 2;

[0039] In the third state, the sealing plate 33 moves downward to close the first opening 21;

[0040] When the separation device 3 switches from the third state to the first state, the liquid at the interface position between the heavy phase and the light phase is collected into the housing 2.

[0041] When the mixing tank transports the mixed mixed-phase liquid to the separation tank 1, the separation device 3 is in the first state, that is, the top plate 31 separates the inner cavity of the housing 2 and the separation tank 1, and at this time, the sealing plate 33 is in a state of closing the first opening 21, as Figure 2 shown. When the mixed phase in the separation tank 1 is stratified, the light phase and the heavy phase are stratified up and down. When extracting tantalum and niobium compounds, the organic phase (sec-octanol) is the light phase. The separation device 3 switches to the second state to discharge the heavy phase. Specifically, both the top plate 31 and the sealing plate 33 move upward, so that the top plate 31 moves above the housing 2, and the sealing plate 33 moves to a position above the first opening 21. The bottom plate 32 also moves with the top plate 31 and is located below the first opening 21, as Figure 3 shown. A first flow channel for liquid flow will be formed at the separation device 3, and the heavy phase will flow out through the first flow channel. When the interface position between the heavy phase and the light phase flows close to the housing 2, the separation device 3 switches to the third state. At this time, the sealing plate 33 moves downward to close the first opening 21, so that the first flow channel is closed. Then the separation device 3 switches to the first state. After switching to the first state, the interface position between the heavy phase and the light phase is inside the housing 2. During specific operation, the sealing plate 33 can be moved to close the first opening 21 when the interface position is inside the housing 2 but above the first opening 21; then only the light phase will exist in the separation tank 1, and it is discharged through the light phase outlet 12 to obtain the organic phase loaded with tantalum and niobium, so as to facilitate the subsequent further separation and extraction of tantalum and niobium.

[0042] It should be noted that in the case of manual operation, in order to facilitate observing the movement of the interface position, a visual window can be provided at the corresponding position of the separation tank 1, and the housing 2 can be a visible glass part; in order to make the identification of the interface position more accurate, sensors can also be used for identification, such as optical sensors and ultrasonic sensors, etc. The method is a prior art. Taking the setting of an optical sensor as an example, it identifies the interface by detecting the optical properties of the liquid (such as refractive index, light transmittance, etc.). Its principle is to utilize the different refractive indices of the heavy phase and the light phase. By observing the refractive index or light transmittance of the liquid, the position of the interface between the two phases can be judged. The sensor identifies whether the interface position is at the required position by capturing the change in the refractive index, so as to automatically control the movement of the sealing plate 33 according to the identification result.

[0043] In an embodiment of the present invention, the bottom of the housing 2 has an opening through which the bottom plate 32 can be moved out. The bottom plate 32 can move downward below the housing 2 in the first state to form a second flow channel (not shown in the figure) for the liquid in the housing 2 to flow out from its bottom;

[0044] During the batch extraction and separation process, the liquid at the interface between the heavy phase and the light phase collected in the bin 2 can be discharged successively. Optionally, another separation tank 1 is connected to the second flow channel so that the liquid flowing out of the second flow channel is collected in the other separation tank 1. After the separation tank 1 collects sufficient two-phase liquid, the two-phase separation operation is further performed;

[0045] During the liquid-liquid extraction process, the liquid at the interface may be in a relatively unstable state, and partial mixing of the two phases is likely to occur, resulting in incomplete separation. By first collecting the two-phase mixed liquid at the interface and then performing secondary separation, this problem can be effectively avoided, ensuring that the finally obtained two-phase liquid is purer. By collecting a sufficient amount of liquid at the interface and then concentrating the secondary separation, providing additional time and space to optimize the separation process can reduce the operation risk caused by the interface fluctuation and ensure that the entire extraction process is safer and more reliable.

[0046] In an embodiment of the present invention, when the separation device 3 is in the third state, during the process of the sealing plate 33 moving downward to close the first opening 21, the top plate 31 moves downward synchronously. When the sealing plate 33 moves downward, the size of the first opening 21 gradually decreases. Although the liquid flow rate will decrease, it still has a relatively high flow rate. In order to facilitate controlling the interface position to be accurately collected in the bin 2, the top plate 31 moves downward synchronously so that the distance between the top plate 31 and the top of the bin 2 decreases, reducing the liquid flow rate flowing into the bin 2 and thus reducing the flow rate of the liquid flowing through the first flow channel, thereby reducing the moving speed of the interface position and giving sufficient reaction time for manual vision or sensors. It should be noted that when using the sensor method, two groups of sensors can be set. One group is located in the separation tank 1 and is used to monitor the relative position of the interface in the separation tank 1. When the interface approaches the bin 2, the separation device 3 switches to the third state. The other group is located in the bin 2 and is used to monitor the position of the interface in the bin 2. After the interface is in the appropriate position, the sealing plate 33 completes the movement.

[0047] In an embodiment of the present invention, the above-mentioned method of connecting another separation tank 1 to the second flow channel is given. Here, another method of treating the two-phase mixed liquid in the bin 2 is provided. Specifically, the bottom plate 32 can axially move relative to the top plate 31 along the bin 2 to abut against the top plate 31 in the fourth state. A second opening 34 is provided at the top of the top plate 31, and a one-way valve (not shown in the figure) is provided at the second opening 34. The one-way valve only allows the liquid to flow from the bin 2 into the inner cavity of the separation tank 1. After collecting the liquid at the interface between the heavy phase and the light phase in the bin 2, first discharge the light phase, and then move the bottom plate 32 upward so that the bottom plate 32 and the top plate 31 are abutted and fitted to each other, as Figure 7As shown, at this time, the space between the top plate 31 and the bottom plate 32 is compressed, and the mixed liquid therein is discharged from the one-way valve and returns to the empty separation tank 1. When the next mixed extractant flows into the separation tank 1, it is mixed with the extractant in the tank 1. After stratification, the above separation operation is continued for separation. In this way, the liquid at the two-phase boundary part is processed with the self-owned separation tank 1. It should be noted that in order to enable the bottom plate 32 to return smoothly, a gas passage 35 needs to be provided, as Figure 7 shown, the gas passage 35 is arranged in the top plate 31 and the first shaft 44. One end of the gas passage 35 communicates with the external air, and the other end communicates with the bottom space of the top plate 31. Another one-way valve (not shown in the figure) is installed at the gas passage 35. This one-way valve only allows the external air to flow to the bottom space of the top plate 31, so that the bottom plate 32 can move smoothly when moving downward to return.

[0048] In an embodiment of the present invention, the multi-stage extraction device for the production of tantalum-niobium compounds further includes a driving device 4. The driving device 4 includes a first driving member 41 for driving the top plate 31 to move, a second driving member 42 for driving the bottom plate 32 to move, and a third driving member 43 for driving the sealing plate 33 to move. The first driving member 41 is connected to the first shaft 44. One end of the first shaft 44 is fixedly connected to the bottom of the top plate 31. The second driving member 42 is connected to the second shaft 45. The second shaft 45 is fixedly connected to the bottom of the bottom plate 32. The second shaft 45 is slidably connected to the inner wall of the bin body 2. The first shaft 44 and the second shaft 45 are coaxially arranged, and the first shaft 44 penetrates through the second shaft 45 and is movably connected to the second shaft 45;

[0049] In an embodiment of the present invention, the first driving member 41 includes a connecting plate 411 connected to the first shaft 44. One end of the connecting plate 411 is connected to an A driving member 412 for driving its movement. In order to ensure the stability of the movement of the first shaft 44, the middle of the connecting plate 411 is connected to the first shaft 44, as Figure 2 shown, both ends of the connecting plate 411 are connected to the A driving member 412;

[0050] In an embodiment of the present invention, the A driving member 412 is a cylinder or a hydraulic cylinder or an electric telescopic rod. The piston rod of the cylinder or the piston rod of the hydraulic cylinder or the telescopic rod of the electric telescopic rod is connected to the connecting plate 411. The cylinder body of the cylinder or the cylinder body of the hydraulic cylinder or the cylinder body of the electric telescopic rod is connected to the bottom of the bottom cover 5. The two A driving members 412 drive the connecting plate 411 to move up or down synchronously, so that the first shaft 44 moves up or down to drive the top plate 31 to move.

[0051] In an embodiment of the present invention, a specific example of the second driving member 42 is provided. The second driving member 42 includes a threaded shaft 421, which is rotatably connected to the surface of the first shaft rod 44, and is threadedly connected to the inner wall of the second shaft rod 45. The bottom of the threaded shaft 421 is connected to a B driving member 422 for driving its rotation. A bracket 423 is rotatably connected to the bottom of the threaded shaft 421, and the bracket 423 is fixedly installed on the connecting plate 411. The B driving member 422 is installed on one side of the first driving member 41 and moves synchronously with the first shaft rod 44;

[0052] In an embodiment of the present invention, as Figure 2 shown, the B driving member 422 includes a first gear 4221, the inner wall of the first gear 4221 is fixedly connected to the lower end of the threaded shaft 421, a second gear 4222 is meshed and connected to one side of the first gear 4221, and the inner wall of the second gear 4222 is connected to one end of the output shaft of the motor 4223. The motor 4223 is fixedly installed on the connecting plate 411. By driving the second gear 4222 to rotate by the motor 4223 and driving the first gear 4221 to rotate, the rotation of the first gear 4221 drives the threaded shaft 421 to rotate. When the bottom plate 32 needs to move upward relative to the bottom plate 32, the rotation of the threaded shaft 421 drives the second shaft rod 45 to slide upward along the inner wall of the bin body 2, so that the top plate 31 moves to the fourth state where it abuts against the top plate 31.

[0053] In an embodiment of the present invention, a specific example of the third driving member 43 is provided, which uses the movement of the bottom plate 32 to drive the movement of the sealing plate 33. Specifically, the third driving member 43 includes a guide plate 431 installed at the bottom of the sealing plate 33. A limiting groove 432 is opened on one side of the guide plate 431 close to the inner wall of the bin body 2, and a limiting block 433 is fixedly connected to the inner wall of the bin body 2. The limiting block 433 is slidably connected to the limiting groove 432;

[0054] It should be noted that since the sealing plate 33 needs to close and open the first opening 21, it has two positions during its movement, namely the position of opening the first opening 21 and the position of closing the first opening 21, as Figure 2 and Figure 3 in the positions. Therefore, the length of the limiting groove 432 is usually set according to the position of the sealing plate 33. Specifically, when the guide plate 431 moves, the limiting groove 432 moves synchronously. When the limiting groove 432 moves, it is blocked by the limiting block 433, and has an upward movement end and a downward movement end. The two movement ends respectively correspond to the position of opening the first opening 21 and the position of closing the first opening 21. By setting the limiting groove 432 and the limiting block 433, the movement of the sealing plate 33 is positioned;

[0055] The guide plate 431 is slidably connected to the inner wall of the bottom plate 32. A clamping member is arranged inside the bottom plate 32. The clamping member includes a cylindrical groove 434 axially formed in the bottom plate 32. A clamping ball 435 is slidably connected in the cylindrical groove 434. A spring 436 is installed between the clamping ball 435 and the cylindrical groove 434. The elastic force of the spring 436 acts on the clamping ball 435 so that the clamping ball 435 has a tendency to move away from the axis of the bottom plate 32. A plurality of ball grooves 437 are formed on one side of the guide plate 431. As Figure 3 and Figure 4 shown, initially the bottom plate 32 is located at the lowermost ball groove 437, and the clamping ball 435 is clamped at the lowermost ball groove 437. At this time, the sealing plate 33 is in the position of closing the first opening 21. When the bottom plate 32 moves upward, without the top plate 31 obstructing the movement of the sealing plate 33, the movement of the bottom plate 32 will drive the guide plate 431 to move upward, thereby driving the sealing plate 33 to move upward and opening the first opening 21. Under the limiting action of the limiting groove 432 and the limiting block 433, when the bottom plate 32 continues to move, the sealing plate 33 will not continue to move. The clamping ball 435 compresses the spring 436 and thus disengages from the current ball groove 437. When the bottom plate 32 moves to the required position, the clamping ball 435 is clamped in the ball groove 437 at that place. When the bottom plate 32 does not move, the clamping member will limit the movement of the sealing plate 33;

[0056] It should be noted that the depth of the ball groove 437 is less than the radius of the clamping ball 435, so that the clamping ball 435 can compress the spring 436 under the push of the ball groove 437 and thus disengage from the ball groove 437. For the spring 436, its elastic force should be sufficient to overcome the gravity of the sealing plate 33 and the guide plate 431 when the clamping ball 435 is clamped in the ball groove 437 and drive the sealing plate 33 to move. In order to improve the stability of the movement of the sealing plate 33, the number of guide plates 431 is preferably two, and the two guide plates 431 are symmetrically arranged. As Figure 3 shown; at least two ball grooves 437 should be provided. When two ball grooves 437 are provided, they are respectively located at both ends of the guide plate 431. When the clamping ball 435 moves into the upper ball groove 437, the separating device 3 is in the second state;

[0057] In addition, the number of the first openings 21 can be set to be multiple, and they are distributed in an annular array. The sealing plate 33 is annular, and the axial width of the sealing plate 33 is greater than the width of the first opening 21, so that it can cover the first opening 21 to form a seal.

[0058] In an embodiment of the present invention, as Figure 3 and Figure 5As shown, for the convenience of liquid flow, the longitudinal section of the bottom plate 32 is in the shape of a "frustum of a cone". In the second state, the top edge of the bottom plate 32 is flush with the lower edge of the first opening 21. It should be understood that in the fourth state where the bottom plate 32 can axially move relative to the top plate 31 along the axis of the bin 2 to abut against the top plate 31, the bottom of the top plate 31 is also in the shape that fits the bottom of the bottom plate 32. When the bottom plate 32 abuts against the top plate 31, the two can fit relatively closely, enabling the liquid inside to flow out from the one-way valve to the maximum extent.

[0059] In an embodiment of the present invention, the bottom cover 5 is fixedly connected to the bottom of the separation tank 1. The bottom cover 5 and the bottom of the separation tank 1 and the surface of the bin 2 form a sealed transition cavity 6. In the second state, the first flow channel communicates with the transition cavity 6. A heavy-phase outlet 51 is provided on one side of the transition cavity 6. A filter screen (not shown in the figure) is provided near the heavy-phase outlet 51 in the transition cavity 6. Since the tantalum-niobium ore pulp will contain certain solid impurities, after being mixed with the organic matter in the mixing tank, it is discharged into the separation tank 1 together and left to settle in the heavy phase. When the heavy phase flows out from the first opening 21, it will carry solids out. By providing the bottom cover 5, the heavy-phase liquid flowing out from the first opening 21 first flows into the bottom cover 5, and then flows out through the heavy-phase outlet 51 provided on the bottom cover 5. By providing a filter screen at the outlet, the solid impurities are retained in the bottom cover 5, and a slag discharge port (not shown in the figure) is provided at the bottom of the bottom cover 5 to collect and clean the fixed impurities.

[0060] In an embodiment of the present invention, an implementation scenario of the above-mentioned multi-stage extraction device for the production of tantalum-niobium compounds is provided:

[0061] Mixing stage:

[0062] The tantalum-niobium ore pulp and the organic phase are transported to the mixing tank for stirring and mixing, so that the two-phase liquids are fully mixed and contacted. After mixing, the mixed liquid in the mixing tank is transported to the separation tank 1.

[0063] Separation stage:

[0064] The mixed liquid is transported to the separation tank 1 for static separation. At this time, the two-phase liquids are gradually stratified. The organic phase loaded with tantalum-niobium compounds is located in the upper layer of the system, and the raffinate phase is located in the lower layer of the system. The separation device 3 is in the first state ( Figure 6 as shown in Figure a in

[0065] The top plate 31 and the bottom plate 32 are moved by the first driving member 41, so that the top plate 31 and the bottom plate 32 move upward synchronously. The top plate 31 gradually moves above the bin body 2. When the bottom plate 32 moves, the sealing plate 33 is moved by the clamping member to gradually open the first opening 21. After the first opening 21 is opened, the bottom plate 32 continues to move until the top edge of the plate is flush with the lower edge of the first opening 21. At this time, the bin body 2, the top plate 31, the bottom plate 32 and the first opening 21 form a first flow channel for liquid to flow. The separation device 3 is in the second state ( Figure 6 as shown in Figure b in

[0066] ), and the heavy-phase liquid flows from the first flow channel to the outside; Figure 6 When the heavy-phase liquid flows out, as the heavy-phase liquid decreases, the interface at the demarcation position will gradually move downward. When it moves to the position of the bin body 2, the top plate 31 and the bottom plate 32 move downward synchronously. When the bottom plate 32 moves, the sealing plate 33 is driven to move downward by the clamping member. When the sealing plate 33 moves to close the first opening 21, the demarcation position is controlled to be inside the bin body 2, and the separation device 3 is in the third state and starts to switch to the first state ( Figure 6 as shown in Figure c in

[0067] and Figure a in Figure 7 );

[0068] The light-phase outlet 12 is opened to allow the light phase in the separation tank 1 to flow out. After collection, it is subjected to the next treatment. After the separation tank 1 is emptied, the bottom plate 32 moves upward to the fourth state ( Figure 7 ) where it abuts against the top plate 31, and the two-phase liquid in the bin body 2 is squeezed and conveyed into the emptied separation tank 1. It should be noted that when the bottom plate 32 moves upward, since the top plate 31 does not move, the sealing plate 33 is blocked by the top plate 31 and does not move, and the clamping member cannot move the guide plate 431. At this time, the sealing plate 33 remains in the state of closing the first opening 21;

[0068] When the separation tank 1 is performing separation operations, the mixing tank can continue to mix the pulp of the same batch, and then convey the mixed liquid to the separation tank 1. For the separation tank 1 that has been separated at least once, the part of the two-phase liquid contained in it that is returned from the bin body 2 will be re-statically separated from the new mixed liquid, so as to perform the next separation operation.

[0069] In an embodiment of the present invention, due to the difference in the processing time of the mixing tank and the separation tank 1, for the case where the processing time of the mixing tank is less than that of the separation tank 1, one mixing tank can correspond to multiple separation tanks 1. Similarly, if the processing time of the separation tank 1 is less than that of the mixing tank, it can also correspond to multiple mixing tanks. The same is true when there is a difference in the volume of the mixing tank and the separation tank 1;

[0070] During the production process, since the organic phase is often recycled or there are other extractable substances in the heavy phase, a multi-group combined extraction device can also be adopted. Specifically, when the processing efficiency of a mixing tank and a separation tank 1 is similar, they form a group. By connecting multiple groups in combination, the heavy-phase outlet 51 in the separation tank 1 of the previous group is connected to the inlet of the mixing tank of the next group, which is used to process the residual tantalum and niobium compounds in the heavy phase or extract other substances in the heavy phase with other extractants.

[0071] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-stage extraction device for the production of tantalum-niobium compounds, comprising a mixing tank and a separation tank, wherein the discharge port of the mixing tank is connected to the feed port of the separation tank, and a light phase outlet is provided at the bottom of the separation tank, characterized in that: A bin body is coaxially arranged at the bottom of the separation tank and communicated with the inner cavity of the separation tank, and a first opening is opened on the periphery of the bin body; A separation device is arranged in the bin body, the separation device comprises a top plate, a bottom plate and a sealing plate, the separation device can move along the axial direction of the bin body and has a first state, a second state and a third state; In the first state, the top plate is located on the top of the silo and separates the silo and the separation tank; In the second state, the top plate is located above the bin body, and the sealing plate moves to above the first opening, so that a first flow channel connecting the inner cavity of the separation tank and the outside of the first opening is formed in the bin body; In the third state, the sealing plate moves downward and closes the first opening; When the separation device switches from the third state to the first state, the liquid at the boundary between the heavy phase and the light phase is collected in the bin; The longitudinal section of the bottom plate is in a "truncated cone" shape, and in the second state, the top edge of the bottom plate is flush with the lower edge of the first opening; A bottom cover is fixedly connected to the bottom of the separation tank, and the bottom cover, the bottom of the separation tank and the surface of the bin body form a sealed transition chamber. In the second state, the first flow channel is connected to the transition chamber, a heavy phase outlet is provided on one side of the transition chamber, and a filter screen is provided in the transition chamber near the heavy phase outlet.

2. A multi-stage extraction device for producing tantalum-niobium compounds according to claim 1, characterized in that: In the third state, the top plate moves downward synchronously so that the distance between the top plate and the top of the warehouse body is reduced.

3. The multi-stage extraction device for producing tantalum-niobium compounds according to claim 1, characterized in that: The bottom plate can move axially relative to the top plate along the bin body to a fourth state of abutting against the top plate. A second opening is provided on the top of the top plate, and a one-way valve is provided at the second opening. The one-way valve only allows liquid to flow from the bin body to the inner cavity of the separation tank.

4. A multi-stage extraction device for the production of tantalum-niobium compounds according to any one of claims 1 to 3, characterized in that: It also includes a driving device, which includes a first driving member for driving the top plate to move, a second driving member for driving the bottom plate to move, and a third driving member for driving the sealing plate to move, the first driving member is connected to a first shaft rod, one end of the first shaft rod is fixedly connected to the bottom of the top plate, the second driving member is connected to a second shaft rod, the second shaft rod is fixedly connected to the bottom of the bottom plate, the second shaft rod is slidably connected to the inner wall of the bin, the first shaft rod and the second shaft rod are coaxially arranged, and the first shaft rod passes through the second shaft rod and is movably connected to the second shaft rod.

5. The multi-stage extraction device for producing tantalum-niobium compounds according to claim 4, characterized in that: The second driving member includes a threaded shaft, which is rotatably connected to the surface of the first shaft rod and threadedly connected to the inner wall of the second shaft rod. The bottom of the threaded shaft is connected to a B driving member for driving its rotation. The B driving member is installed on one side of the first driving member and moves synchronously with the first shaft rod.

6. A multi-stage extraction device for producing tantalum-niobium compounds according to claim 4, characterized in that: The third driving member includes a guide plate installed at the bottom of the sealing plate, the guide plate is slidably connected to the inner wall of the bottom plate, a limiting groove is provided on the side of the guide plate close to the inner wall of the bin body, a limiting block is fixedly connected to the inner wall of the bin body, and the limiting block is slidably connected to the limiting groove.

7. A multi-stage extraction device for producing tantalum-niobium compounds according to claim 6, characterized in that: A clamping part is arranged in the base plate, and the clamping part includes a cylindrical groove opened in the axial direction of the base plate, a clamping ball is slidably connected in the cylindrical groove, a spring is installed between the clamping ball and the cylindrical groove, and the spring elastic force acts on the clamping ball so that the clamping ball has a tendency to move away from the axis of the base plate. A plurality of ball grooves are opened on one side of the guide plate, and the depth of the ball grooves is less than the radius of the clamping ball.

8. The multi-stage extraction device for producing tantalum-niobium compounds according to claim 1, characterized in that: There are multiple mixing tanks and separation tanks, and at least one mixing tank is connected to one or more separation tanks.

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