Special multi-stage extraction device for tantalum-niobium compound production

Abstract

The invention discloses a special multi-stage extraction device for tantalum-niobium compound production, and relates to the field of extraction devices, the special multi-stage extraction device comprises a mixing tank and a separation tank, a discharge port of the mixing tank is communicated with a feed port of the separation tank, the bottom of the separation tank is provided with a light phase outlet, and a bin body is coaxially arranged at the bottom of the separation tank and communicated with an inner cavity of the separation tank; a first opening is formed in the peripheral side of the bin body, and the separating device is arranged in the bin body and comprises a top plate, a bottom plate and a sealing plate; according to the special multi-stage extraction device for production of the tantalum-niobium compound, by arranging the bin body and the separation device, part of liquid at the boundary position of two phases can be collected into the bin body, the liquid is purer in the separation process of an extraction phase and a raffinate phase, and the liquid collected by the bin body can be subjected to centralized secondary separation after being collected; the problem of incomplete separation caused by an unstable state of a boundary position during two-phase separation is avoided, the operation risk caused by interface fluctuation is reduced, and the whole extraction process is ensured to be safer and more reliable.

Description

Technical Field

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

[0002] The extraction of tantalum-niobium compounds is an important part of the production process of tantalum-niobium products. Before extraction, the tantalum-niobium ore is firstly subjected to acid hydrolysis to obtain tantalum-niobium ore pulp. The ore pulp is then subjected to extraction. During extraction, it is firstly mixed completely with the extraction phase (organic phase, mainly 2-octanol). The principle is mainly to load tantalum and niobium through the organic phase, and the mixed liquid is transported to a container for static stratification. The organic phase containing tantalum and niobium is collected for further subsequent extraction. However, since the liquid at the interface may be in a relatively unstable state, the two phases may be partially mixed, the phase separation may be incomplete, or a long time may be required for a relatively thorough phase separation, resulting in difficulty in separating the two phases relatively completely during the separation process. Cross-contamination often occurs during the separation process, such as the presence of an organic phase in the aqueous phase or an aqueous phase in the organic phase, which may easily interfere with the subsequent extraction process. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-stage extraction device specially used for the production of tantalum-niobium compounds, so as to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solution: 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. The multi-stage extraction device for the production of tantalum-niobium compounds also comprises: 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 bottom plate has a longitudinal section in the shape of a truncated cone, 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.

[0005] Furthermore, 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.

[0006] Furthermore, 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.

[0007] Furthermore, the multi-stage extraction device dedicated to the production of tantalum-niobium compounds 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 body, 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.

[0008] Furthermore, 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.

[0009] Furthermore, 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.

[0010] Furthermore, a clamping part is provided 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.

[0011] Furthermore, a plurality of mixing tanks and separation tanks are provided, and at least one mixing tank is connected to one or more separation tanks.

[0012] Compared with the prior art, the multi-stage extraction device for producing tantalum-niobium compounds provided by the present invention has the following beneficial effects: The multi-stage extraction device specially used for the production of tantalum-niobium compounds is provided with a bin and a separation device so that part of the liquid at the boundary between the two phases can be collected in the bin, making the extraction phase and the residual phase more purified during separation. The liquid collected in the bin can be collected and then concentrated for secondary separation, thus avoiding the problem of incomplete separation due to the unstable state of the boundary when separating the two phases, reducing the operational risks caused by interface fluctuations, and ensuring that the entire extraction process is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0014] Figure 1 A schematic diagram of the overall structure of a separation tank of a multi-stage extraction device for producing tantalum-niobium compounds provided in an embodiment of the present invention; Figure 2 A schematic diagram of a partial longitudinal section structure of a separation tank provided in an embodiment of the present invention; Figure 3 A schematic diagram of the local structure of the separation device moving to the second state in the longitudinal section state of the bin body and the separation tank provided in an embodiment of the present invention; Figure 4 The embodiment of the present invention provides Figure 3 The enlarged view of point A in the middle; Figure 5 A schematic diagram of a first flow channel formed when the separation device provided by an embodiment of the present invention is in a second state; Figure 6 A flow chart of the separation device provided in an embodiment of the present invention when switching between a first state (Figure a in the figure), a second state (Figure b in the figure) and a third state (Figure c in the figure); Figure 7 A schematic diagram of the state of the bottom plate provided in an embodiment of the present invention when it moves to fit the bottom of the top plate.

[0015] Description of reference numerals: 1. Separation tank; 11. Feed inlet; 12. Light phase outlet; 2. Bin; 21. First opening; 3. Separation device; 31. Top plate; 32. Bottom plate; 33. Sealing plate; 34. Second opening; 35. Gas channel; 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. Limiting groove; 433. Limiting block; 434. Columnar groove; 435. Snap-in ball; 436. Spring; 437. Ball groove; 44. First shaft; 45. Second shaft; 5. Bottom cover; 51. Heavy phase outlet; 6. Transition chamber. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] For examples, see Figure 1 - Figure 7 A multi-stage extraction device for the production of tantalum-niobium compounds, comprising a mixing tank (not shown) and a separation tank 1, wherein the mixing tank is used to fully stir and mix the tantalum-niobium slurry to be extracted and the organic phase, and the extraction mechanism is not described in detail here. After a certain period of mixing, the mixed phase liquid is transported to the separation tank 1 for static stratification, and 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 port 11 of the separation tank 1, and a light phase outlet 12 is provided at the bottom of the separation tank 1. After the heavy phase is separated, the light phase liquid flows out from the light phase outlet 12. The extraction device also includes: The bin body 2 is coaxially arranged at the bottom of the separation tank 1 and communicates with the inner cavity of the separation tank 1. A first opening 21 is opened on the periphery of the bin body 2; A separation device 3 is disposed in the silo 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 2 and has a first state, a second state and a third state. In the first state, the top plate 31 is located on the top of the silo 2 and separates the silo 2 and the separation tank 1; In the second state, the top plate 31 is located above the bin body 2, and the sealing plate 33 moves to above the first opening 21, so that a first flow channel connecting the inner cavity of the separation tank 1 and the outside of the first opening 21 is formed in the bin body 2; In the third state, the sealing plate 33 moves downward and closes the first opening 21; When the separation device 3 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 body 2 .

[0018] When the mixing tank delivers the 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 separation tank 1 from the silo 2, and the sealing plate 33 is in the state of closing the first opening 21. Figure 2 As shown, after the mixed phase in the separation tank 1 is separated, the light phase and the heavy phase are separated into upper and lower layers. When the tantalum-niobium compound is extracted, the organic phase (sec-octanol) is the light phase. The separation device 3 is switched to the second state to extract the heavy phase. Specifically, the top plate 31 and the sealing plate 33 are both moved upward, so that the top plate 31 moves to the top of the bin body 2, the sealing plate 33 moves to the position above the first opening 21, and the bottom plate 32 also moves with the top plate 31 and is located below the first opening 21. Figure 3 As 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 boundary between the heavy phase and the light phase flows to near the bin body 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 boundary between the heavy phase and the light phase is in the bin body 2. During specific operation, the sealing plate 33 can be moved to close the first opening 21 when the boundary position is in the bin body 2 but above the first opening 21; thereafter, only the light phase will exist in the separation tank 1, which will be 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.

[0019] It should be noted that, in the case of manual operation, in order to facilitate the observation of the movement of the boundary position, a visual window can be set at the corresponding position of the separation tank 1, and the warehouse body 2 can be a visible glass part; and in order to make the identification of the boundary position more accurate, it can also be identified by a sensor, such as an optical sensor and an ultrasonic sensor, etc., and the method is the existing technology. Taking the setting of an optical sensor as an example, it identifies the boundary by detecting the optical properties of the liquid (such as refractive index, transmittance, etc.). The principle is to use the different refractive indices of the heavy phase and the light phase. By observing the refractive index or transmittance of the liquid, the position of the boundary between the two phases can be determined. The sensor identifies whether the boundary position is in the desired position by capturing the change in the refractive index, thereby automatically controlling the movement of the sealing plate 33 according to the identification result.

[0020] In one embodiment of the present invention, the bottom of the bin body 2 has an opening for the bottom plate 32 to move out, and the bottom plate 32 can move downward to below the bin body 2 in the first state to form a second flow channel (not shown in the figure) for the liquid in the bin body 2 to flow out from the bottom thereof; In the process of batch multiple extraction and separation, the liquid collected at the boundary between the heavy phase and the light phase in the bin body 2 can be discharged one by one. Optionally, another separation tank 1 is provided to connect to the second flow channel, so that the liquid flowing out of the second flow channel is collected in another separation tank 1. After the separation tank 1 collects enough two-phase liquid, the two-phase separation operation is further performed. During the liquid-liquid extraction process, the liquid at the interface may be in a relatively unstable state, which may easily lead to partial mixing of the two phases, resulting in incomplete separation. This problem can be effectively avoided by first collecting the two-phase mixed liquid at the boundary and then performing a secondary separation, ensuring that the final two-phase liquid is purer. By collecting a sufficient amount of liquid at the boundary and then performing a secondary separation, additional time and space are provided to optimize the separation process, which can reduce the operational risks caused by interface fluctuations and ensure that the entire extraction process is safer and more reliable.

[0021] In one embodiment of the present invention, when the separation device 3 is in the third state, the sealing plate 33 moves downward to close the first opening 21, and 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 the control of the boundary position so that it can be accurately collected in the warehouse body 2, the top plate 31 moves downward synchronously to reduce the distance between the top plate 31 and the top of the warehouse body 2, reduce the liquid flow rate flowing into the warehouse body 2, and reduce the flow rate from the first flow channel, thereby reducing the speed of movement of the boundary position, giving sufficient reaction time through artificial vision or sensors. It should be noted that when using sensors, two groups of sensors can be set, one group is located in the separation tank 1, used to monitor the boundary position in the separation tank 1 in a relative position, when the boundary position is close to the warehouse body 2, the separation device 3 switches to the third state, and the other group is located in the warehouse body 2, used to monitor the position of the boundary position in the warehouse body 2, after the boundary position is in a suitable position, the sealing plate 33 completes the movement.

[0022] In one embodiment of the present invention, the above-mentioned method of connecting the second flow channel by setting another separation tank 1 is provided. Here, another method of processing the two-phase mixed liquid in the warehouse body 2 is provided. Specifically, the bottom plate 32 can move axially along the warehouse body 2 relative to the top plate 31 to a fourth state of abutting against the top plate 31. A second opening 34 is opened on 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 liquid to flow from the warehouse body 2 to the inner cavity of the separation tank 1. After the liquid at the boundary between the heavy phase and the light phase is collected in the warehouse body 2, the light phase is first discharged, and then the bottom plate 32 is moved upward so that the bottom plate 32 and the top plate 31 abut against each other. 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 returned to the empty separation tank 1. The next mixed extract flows into the separation tank 1 and mixes with it. After stratification, the above separation operation is continued for separation. In this way, the liquid at the boundary of the two phases is processed with the own separation tank 1. It should be noted that in order to enable the bottom plate 32 to return smoothly, a gas channel 35 needs to be provided, such as Figure 7 The gas channel 35 is arranged in the top plate 31 and the first shaft rod 44, one end of which is connected to the external air, and the other end is connected to the top and bottom spaces, and another one-way valve (not shown in the figure) is installed at the gas channel 35. The one-way valve only allows external air to flow to the bottom space of the top plate 31, so that the bottom plate 32 can move smoothly when it moves downward and returns.

[0023] In one 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 a 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 a 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 passes through the second shaft 45 and is movably connected to the second shaft 45; In one 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 the A driving member 412 for driving the first shaft 44 to move. 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. Figure 2 As shown, both ends of the connecting plate 411 are connected to a driving member A 412; In one 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, and 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 connecting plate 411 is synchronously driven to move upward or downward by two A driving members 412, so that the first shaft rod 44 moves upward or downward to drive the top plate 31 to move.

[0024] In one embodiment of the present invention, a specific example of a second driving member 42 is provided, wherein the second driving member 42 comprises a threaded shaft 421, the threaded shaft 421 is rotatably connected to the surface of the first shaft 44, the threaded shaft 421 is threadedly connected to the inner wall of the second shaft 45, the bottom of the threaded shaft 421 is connected to a B driving member 422 for driving the rotation thereof, the bottom of the threaded shaft 421 is rotatably connected to a bracket 423, the bracket 423 is fixedly mounted on the connecting plate 411, and the B driving member 422 is mounted on one side of the first driving member 41 and moves synchronously with the first shaft 44; In one embodiment of the present invention, Figure 2 As 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, and the second gear 4222 is meshedly 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, and the second gear 4222 is driven by the motor 4223 to rotate and drive 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 warehouse body 2, so that the top plate 31 moves to the fourth state of abutting against the top plate 31.

[0025] In one embodiment of the present invention, a specific example of a third driving member 43 is provided, which utilizes 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, and a limiting groove 432 is provided on the side of the guide plate 431 close to the inner wall of the bin body 2. A limiting block 433 is fixedly connected to the inner wall of the bin body 2, and the limiting block 433 is slidably connected to the limiting groove 432. It should be noted that, since the sealing plate 33 needs to close and open the first opening 21, it has two positions when moving, namely, a position for opening the first opening 21 and a position for closing the first opening 21. Figure 2 and Figure 3 The position of the first opening 21 is shown in FIG. 4 , so 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. It has an upward movement end and a downward movement end. The two travel ends correspond to the position of opening the first opening 21 and the position of closing the first opening 21, respectively. The movement of the sealing plate 33 is positioned by setting the limiting groove 432 and the limiting block 433. The guide plate 431 is slidably connected to the inner wall of the bottom plate 32. A clamping member is provided in the bottom plate 32. The clamping member includes a cylindrical groove 434 opened in the axial direction of 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 opened on one side of the guide plate 431, such as Figure 3 and Figure 4 As shown, the bottom plate 32 is initially located at the lowest ball groove 437, and the receiving ball 435 is received at the lowest ball groove 437. At this time, the sealing plate 33 is in a position to close the first opening 21. When the bottom plate 32 moves upward, under the condition that the top plate 31 does not hinder 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, so that the first opening 21 is opened. Under the limiting effect of the limiting groove 432 and the limiting block 433, the sealing plate 33 will not move further if the bottom plate 32 continues to move. The receiving ball 435 compresses the spring 436 and thus disengages from the current ball groove 437. When the bottom plate 32 moves to the desired position, the receiving ball 435 is received in the ball groove 437 there. When the bottom plate 32 does not move, the connecting piece will limit the movement of the sealing plate 33. It should be noted that the depth of the ball groove 437 is smaller than the radius of the locking ball 435, so that the locking ball 435 can compress the spring 436 under the push of the ball groove 437, thereby escaping 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 locking ball 435 is stuck 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 the guide plates 431 is preferably two, and the two guide plates 431 are symmetrically arranged, such as Figure 3 As 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 receiving ball 435 moves into the ball groove 437 located above, the separation device 3 is in the second state; In addition, the number of first openings 21 can be multiple and 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.

[0026] In one embodiment of the present invention, Figure 3 and Figure 5As shown, in order to facilitate the flow of liquid, the longitudinal section of the bottom plate 32 is "conical". 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 move axially relative to the top plate 31 along the warehouse body 2 to abut against the top plate 31, the bottom of the top plate 31 is also in a shape that fits the bottom of the bottom plate 32. When the bottom plate 32 and the top plate 31 are in abutment, the two can fit relatively tightly so that the liquid inside can flow out of the one-way valve to the maximum extent.

[0027] In one embodiment of the present invention, the bottom cover 5 is fixedly connected to the bottom of the separation tank 1, and the bottom cover 5 forms a sealed transition chamber 6 with the bottom of the separation tank 1 and the surface of the silo 2. In the second state, the first flow channel is connected to the transition chamber 6, and a heavy phase outlet 51 is provided on one side of the transition chamber 6. A filter screen (not shown in the figure) is provided in the transition chamber 6 near the heavy phase outlet 51. Since the tantalum-niobium slurry contains certain solid impurities, they are mixed with organic matter in the mixing tank and then discharged into the separation tank 1 to be statically precipitated in the heavy phase. When the heavy phase is discharged from the first opening 21, it will carry solids with it. 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 at the bottom cover 5. By providing the filter screen at the outlet, the solid impurities are retained in the bottom cover 5. 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.

[0028] In one 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: Mixing stage: The tantalum-niobium slurry and the organic phase are transported to a mixing tank for stirring and mixing, so that the two phases of liquid are fully mixed and contacted, and after the mixing is completed, the mixed liquid in the mixing tank is transported to a separation tank 1; Separation phase: The mixed liquid is transported to the separation tank 1 for static separation. At this time, the two phases of liquid are gradually separated, the organic phase loaded with tantalum and 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 (Fig. a); 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, and the top plate 31 gradually moves to the top of 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 flow, and the separation device 3 is in the second state ( Figure 6 (Fig. b), the heavy phase liquid flows from the first flow channel to the outside; When the heavy phase liquid flows out, as the heavy phase liquid decreases, the interface at the boundary position will gradually move downward. When it moves to the position of the warehouse 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 boundary position is controlled to be located in the warehouse body 2, and the separation device 3 is in the third state and starts to switch to the first state ( Figure 6 Figure C and Figure 6 (Fig. a); The light phase outlet 12 is opened to allow the light phase in the separation tank 1 to flow out and be collected for further processing. After the separation tank 1 is emptied, the bottom plate 32 moves upward and moves to the fourth state (abutting against the top plate 31) Figure 7 ), the two-phase liquid in the bin body 2 is squeezed and transported to 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 keeps the first opening 21 closed; When the separation tank 1 is performing separation operation, the slurry of the same batch can continue to be mixed in the mixing tank, and then the mixed liquid is transported to the separation tank 1. For the separation tank 1 that has been separated at least once, part of the two-phase liquid returned from the silo 2 contained therein will be restired and stratified with the new mixed liquid to perform the next separation operation.

[0029] In one embodiment of the present invention, since there is a difference between the processing time of the mixing tank and the processing time of the separation tank 1, if the processing time of the mixing tank is less than the processing time of the separation tank 1, one mixing tank can correspond to multiple separation tanks 1. If the processing time of the separation tank 1 is less than the processing time of the mixing tank, it can also correspond to multiple mixing tanks. The same applies when there is a difference in the volume of the mixing tank and the separation tank 1. In the production process, since the organic phase is often recycled or there are other extractable substances in the heavy phase, multiple groups of extraction devices can be used in combination. Specifically, a mixing tank and a separation tank 1 are a group (when the treatment efficiency of the mixing tank and the separation tank 1 is similar), and the multiple groups are connected for combined use. 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 treat the residual tantalum niobium compounds in the heavy phase or use other extractants to extract other substances in the heavy phase.

[0030] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. 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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