Stratified reflux rare earth extraction cell group based on liquid level balance structure

Abstract

The present invention relates to the technical field of rare earth extraction, and discloses a stepped reflux type rare earth extraction tank group based on a liquid level balance structure, including a placement part. The placement part includes a box body, an accommodation groove is formed inside the box body, there are several groups of the accommodation grooves, and a placement seat is slidably connected to the inner wall of the accommodation groove. This stepped reflux type rare earth extraction tank group based on a liquid level balance structure can effectively solve the problems in the prior art that due to the fixed volume of the extraction tank, it cannot adapt to different quantities. When the processing volume is large, the traditional extraction tank cannot provide enough space to accommodate more materials, resulting in too short residence time of the materials in the tank and insufficient extraction; when the processing volume is small, the liquid in the tank is far from the outlet, the flow of the materials in the tank is not easy and the flow rate is too slow, which easily causes deposition and blockage of the materials in the tank, reducing the operating efficiency of the equipment and increasing the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth extraction, and particularly relates to a stepped reflux type rare earth extraction tank group based on a liquid level balance structure. Background Art

[0002] Rare earths are generally minerals separated in the form of oxides. They are named rare earths because of their scarcity. Rare earths have a variety of uses in various industries, and their chemical properties enable them to be widely used in multiple fields such as optics and magnetism. In industry, the purification of rare earths is often achieved through liquid-liquid extraction. By dissolving other substances in the rare earths or causing stratification, the rare earths can be extracted. An extraction tank group is a set of equipment used in the liquid-liquid extraction process, usually composed of multiple mixing-settling tanks connected in a certain order, and is widely used in fields such as chemical engineering, metallurgy, and environmental protection.

[0003] In the prior art, production requirements often change, and it is necessary for the extraction tank to be able to flexibly adjust the throughput. However, due to its fixed volume, the traditional extraction tank cannot adapt to different throughputs. When the throughput is relatively large, the traditional extraction tank cannot provide enough space to accommodate more materials, resulting in too short residence time of the materials in the tank and insufficient extraction. When the throughput is relatively small, the liquid in the tank is far from the outlet, and the flow of the materials in the tank is difficult and the flow rate is too slow, which easily causes the deposition and blockage of the materials in the tank, reducing the operating efficiency of the equipment and increasing the production cost. Summary of the Invention

[0004] Aiming at the above-mentioned drawbacks of the prior art, the present invention provides a stepped reflux type rare earth extraction tank group based on a liquid level balance structure, which can effectively solve the problems in the prior art that production requirements often change, and it is necessary for the extraction tank to be able to flexibly adjust the throughput. However, due to its fixed volume, the traditional extraction tank cannot adapt to different throughputs. When the throughput is relatively large, the traditional extraction tank cannot provide enough space to accommodate more materials, resulting in too short residence time of the materials in the tank and insufficient extraction. When the throughput is relatively small, the liquid in the tank is far from the outlet, and the flow of the materials in the tank is difficult and the flow rate is too slow, which easily causes the deposition and blockage of the materials in the tank, reducing the operating efficiency of the equipment and increasing the production cost.

[0005] To achieve the above object, the present invention is realized through the following technical solutions:

[0006] The present invention provides a stepped reflux type rare earth extraction tank group based on a liquid level balance structure, including:

[0007] Placement part, the placement part includes a box body, an inner part of the box body is provided with placement grooves, there are several groups of the placement grooves, an inner wall of the placement groove is slidably connected with a placement seat, a lifting assembly for moving the position of the placement seat is arranged at a bottom end of the box body, the placement seat includes a mixing chamber and a clarification chamber, the mixing chamber and the clarification chamber are arranged in sequence along a liquid flow direction, heights of multiple placement seats decrease in sequence along the liquid flow order;

[0008] Stirring part, the stirring part includes a rotating shaft rotatably connected inside the mixing chamber, a stirring paddle is fixedly connected to a bottom of the rotating shaft, and a mixing part for intensifying a mixing effect is arranged inside the mixing chamber;

[0009] Wherein, the lifting assembly includes a connecting rod, a top end of the connecting rod is fixedly connected to a lower surface of the placement seat, a bottom end of the connecting rod penetrates through the box body and is fixedly connected to a connecting plate, a driving seat is fixedly connected to a lower surface of the box body, and a lead screw meshing with an inside of the connecting plate is drivingly connected to a bottom end of the driving seat.

[0010] Further, a baffle plate fixedly connected to an inner wall of the placement groove is slidably connected between the mixing chamber and the clarification chamber, and a weir plate slidably connected to a side of the clarification chamber away from the baffle plate is fixedly connected inside the placement groove.

[0011] Further, the mixing part includes a first bevel gear sleeved on an outer surface of the rotating shaft, a second bevel gear meshing with an outer surface of the first bevel gear is rotatably connected to the mixing chamber through a connecting frame fixed on an inner wall surface thereof, a gear is fixedly connected to an upper surface of the second bevel gear, and a toothed ring meshing with an outer surface of the gear is slidably connected to an inner wall surface of the mixing chamber.

[0012] Further, a rotating plate is fixedly connected to the toothed ring through a stirring plate fixed to a lower surface thereof, a lower surface of the rotating plate is rotatably connected to a bottom of an inner wall of the mixing chamber, and there are multiple stirring plates which are circumferentially and arrayed around an axis line of the rotating shaft.

[0013] Further, an inner wall of the mixing chamber adopts a U-shaped design fitting an outer side of the stirring plate, the rotating plate adopts a conical design with a middle part being high and a periphery being low, and the stirring plate adopts an inclined design.

[0014] Further, a long through opening is formed inside the baffle plate, a circulation opening is formed on a side of the clarification chamber close to the baffle plate, a flow baffle plate is fixedly connected to an inner wall surface of the clarification chamber close to the baffle plate, an outer outlet is formed on a side of the weir plate close to the clarification chamber, and an inner outlet is formed on a side of the clarification chamber close to the weir plate.

[0015] Further, the flow baffle plate adopts an arc design, and a bottom end of the flow baffle plate is close to a side of an inner wall of the clarification chamber close to the baffle plate.

[0016] Furthermore, the bottom of the inner wall of the clarification chamber is designed in an inclined manner, and the lowest point of the bottom of the inner wall of the clarification chamber is close to the side of the weir plate.

[0017] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention is provided with a box body, a lifting component and a placement seat. The box body and the placement seat are designed to be movable. The lifting component at the bottom of the box body can drive the placement seat, the mixing chamber and the clarification chamber to move up and down inside the box body. The depths of the inner walls of the mixing chamber and the clarification chamber change. Correspondingly, the volumes inside the mixing chamber and the clarification chamber also change, so as to adapt to different production requirements: when the processing quantity increases, the lead screw rotates, driving the connecting plate to move downward, and the placement seat, the mixing chamber and the clarification chamber move downward synchronously. At this time, the distances between the mixing chamber and the clarification chamber and the bottom of the cover body become larger, the depths of their inner walls increase, and the volumes increase correspondingly, which can provide a larger space to accommodate more materials, ensure the residence time of rare earth materials in the placement groove, and fully extract; when the processing quantity is less, it drives the connecting plate to move upward, and the placement seat, the mixing chamber and the clarification chamber move upward synchronously. At this time, the distances between the mixing chamber and the clarification chamber and the bottom of the cover body become smaller, the depths of their inner walls decrease, and the volumes decrease correspondingly. The height difference between the bottom of the inner wall of the clarification chamber and the heights of the outer outlet and the inner outlet is small, and the overlapping area of the openings is close to the bottom of the clarification chamber, which can circulate quickly, is not easy to be blocked, and improves the operation efficiency of the equipment; thus meeting the requirements of different production processing quantities and having a wide adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 It is a sectional structural schematic diagram of the box body of an embodiment of the present invention;

[0022] Figure 3 It is an embodiment of the present invention Figure 2 The enlarged partial structural schematic diagram of part A in the figure;

[0023] Figure 4 It is a sectional structural schematic diagram of the lifting component of an embodiment of the present invention;

[0024] Figure 5 It is a sectional structural schematic diagram of the clarification chamber of an embodiment of the present invention;

[0025] Figure 6 Structural schematic diagram of the placement seat, connecting rod and connecting plate in the embodiment of the present invention;

[0026] Figure 7 Structural schematic diagram of the stirring part in the embodiment of the present invention;

[0027] Figure 8 Separation structural schematic diagram of the clarification chamber, weir plate and baffle in the embodiment of the present invention;

[0028] Figure 9 In the embodiment of the present invention Figure 5 Partially enlarged structural schematic diagram at position B.

[0029] The reference numerals in the figure respectively represent: 1. Placement part; 11. Box body; 12. Placement groove; 13. Placement seat; 131. Mixing chamber; 132. Clarification chamber; 14. Lifting assembly; 141. Connecting rod; 142. Connecting plate; 143. Lead screw; 15. Baffle; 151. Long through hole; 152. Flow through hole; 153. Flow baffle; 16. Weir plate; 161. Outer outlet; 162. Inner outlet; 2. Stirring part; 21. Rotating shaft; 22. Stirring paddle; 23. Mixing part; 231. First bevel gear; 232. Second bevel gear; 233. Gear; 234. Tooth ring; 235. Stirring plate; 236. Rotating plate. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention will be further described below with reference to the embodiments.

[0032] Embodiment:

[0033] Please refer to Figures 1 - 9 , the present invention provides a technical solution: a stepped reflux type rare earth extraction tank group based on a liquid level balance structure, including:

[0034] The placing part 1 comprises a box body 11, a placing groove 12 is provided inside the box body 11, and the placing groove 12 is provided with a plurality of groups. The inner wall of the placing groove 12 is slidably connected with a placing seat 13. A lifting assembly 14 for moving the position of the placing seat 13 is provided at the bottom of the box body 11. The placing seat 13 comprises a mixing chamber 131 and a clarifying chamber 132. The mixing chamber 131 and the clarifying chamber 132 are arranged in sequence along the flow direction of the liquid, and the heights of the plurality of placing seats 13 are sequentially reduced along the flow sequence of the liquid.

[0035] The stirring part 2 includes a rotating shaft 21 rotatably connected inside the mixing chamber 131, a stirring paddle 22 is fixedly connected to the bottom of the rotating shaft 21, and a mixing element 23 that can be used to enhance the mixing effect is arranged inside the mixing chamber 131; a cover body is arranged on the upper surface of the box body 11, and the upper part of the cover body is transmission-connected to the rotating shaft 21 through a driving motor.

[0036] Among them, the lifting assembly 14 includes a connecting rod 141, the top of the connecting rod 141 is fixedly connected to the lower surface of the placement seat 13, the bottom end of the connecting rod 141 passes through the box body 11 and is fixedly connected to a connecting plate 142, the lower surface of the box body 11 is fixedly connected to a driving seat, and the bottom end of the driving seat is transmission-connected to a screw rod 143 that meshes with the inside of the connecting plate 142.

[0037] A baffle 15 fixedly connected to the inner wall of the placement tank 12 is slidably connected between the mixing chamber 131 and the clarifying chamber 132 . A weir plate 16 slidably connected to the side of the clarifying chamber 132 away from the baffle 15 is fixedly connected inside the placement tank 12 .

[0038] The mixing element 23 includes a bevel gear 231 sleeved on the outer surface of the rotating shaft 21, and the mixing chamber 131 is rotatably connected to a bevel gear 232 meshing with the outer surface of the bevel gear 231 through a connecting frame fixed on the inner wall surface thereof, and a gear 233 is fixedly connected to the upper surface of the bevel gear 232, and a gear ring 234 meshing with the outer surface of the gear 233 is slidably connected to the inner wall surface of the mixing chamber 131.

[0039] The gear ring 234 is fixedly connected to a rotating plate 236 via a stirring plate 235 fixed on its lower surface. The lower surface of the rotating plate 236 is rotatably connected to the bottom of the inner wall of the mixing chamber 131. A plurality of stirring plates 235 are arranged and distributed in a circular array around the axis of the rotating shaft 21.

[0040] The inner wall of the mixing chamber 131 adopts a U-shaped design that fits with the outer side of the stirring plate 235, the stirring plate 235 adopts an inclined design, and the rotating plate 236 adopts a conical design with a high middle and low surroundings.

[0041] A long through - opening 151 is provided inside the baffle 15. A circulation port 152 is provided on one side of the clarification chamber 132 close to the baffle 15. A baffle plate 153 is fixedly connected to the inner wall surface of the clarification chamber 132 on the side close to the baffle 15. An outer outlet 161 is provided on one side of the weir plate 16 close to the clarification chamber 132. An inner outlet 162 is provided on one side of the clarification chamber 132 close to the weir plate 16. There are two light - phase outlets in the inner outlet 162. One of the light - phase liquid outlets near the bottom side is smaller. When the placement seat 13 rises at the end stage, the remaining light - phase liquid can pass through the coincidence of this inner outlet 162 and the outer outlet 161 of the light - phase liquid, and then be discharged outward.

[0042] The sliding connection parts between the weir plate 16, the baffle 15, the clarification chamber 132 and the mixing chamber 131 all adopt a dynamic - seal sliding design.

[0043] The baffle plate 153 adopts an arc design, and the bottom end of the baffle plate 153 is close to the inner wall of the clarification chamber 132 on the side close to the baffle 15.

[0044] The bottom of the inner wall of the clarification chamber 132 adopts an inclined design, and the lowest point of the bottom of the inner wall of the clarification chamber 132 is close to the side of the weir plate 16.

[0045] The process of mixing the rare - earth raw material liquid and the extraction liquid:

[0046] In practical applications, the device is composed of multiple placement tanks 12 connected in series. When the extraction tank group works, first, the rare - earth raw material liquid containing the solute and the extractant are fed into the mixing chamber 131. There is a cover on the upper part of the box body 11, and a motor is fixedly connected to the outer surface of the cover. The output end of the motor is fixedly connected to the upper end of the rotating shaft 21.

[0047] Initially, the lower surface of the placement seat 13 is in contact with the inner wall bottom of the box body 11. The distance that the connecting rod 141 protrudes from the bottom of the box body 11 is relatively long, and the connecting plate 142 is at the bottom end within its stroke range. When the extraction treatment volume is small, the driving seat at the bottom of the box body 11 starts, driving the lead screw 143 to rotate inside it. A threaded groove adapted to the outer - surface thread of the lead screw 143 is provided in the middle position of the connecting plate 142. At this time, affected by the rotation of the lead screw 143, the connecting plate 142 rises, the stirring paddle 22 is separated from the stirring plate 235, and the distance between the upper surface of the connecting plate 142 and the lower surface of the box body 11 gradually decreases. Correspondingly, the bottom end of the connecting rod 141 is fixedly connected to the connecting plate 142, and the connecting rod 141 will drive the placement seat 13 to move upward together with the connecting plate 142. At this time, the distance between the inner wall bottom of the mixing chamber 131 and the clarification chamber 132 and the lower surface of the cover decreases, and the volumes inside the mixing chamber 131 and the clarification chamber 132 decrease accordingly, which is suitable for extracting less rare - earth materials.

[0048] Start the motor to drive the rotation of the rotating shaft 21. The stirring paddle 22 fixed on the rotating shaft 21 rotates synchronously. Under the action of stirring, the rare earth raw material liquid and the extractant are fully mixed, and the solute transfers from the rare earth raw material liquid to the extractant, realizing the extraction process. Subsequently, the mixed liquid flows into the clarification chamber 132. Since the baffle 15 is fixed and does not move, the long through-hole 151 opened inside it is also in a fixed position and will not move. However, the placement seat 13 drives the clarification chamber 132 to move. The bottom of the inner wall of the clarification chamber 132 is provided with a circulation port 152, and the height of the circulation port 152 is less than that of the long through-hole 151, which can ensure that within its moving range, the placement seat 13 can be lifted to any position, and the size of the channel between the clarification chamber 132 and the mixing chamber 131 remains constant all the time.

[0049] The mixed liquid sequentially passes through the U-shaped opening in the mixing chamber 131, the long through-hole 151 inside the baffle 15, and the circulation port 152 on the inner wall of the clarification chamber 132 and then enters the inside of the clarification chamber 132. Due to the different densities of the two liquids, they will gradually stratify under the action of gravity to form a light phase and a heavy phase. The baffle plate 153 is fixedly connected to the inner wall surface of the clarification chamber 132, which can effectively prevent the situation that when the liquid inside the mixing chamber 131 enters the clarification chamber 132, the internal stratification structure of the clarification chamber 132 is damaged due to excessive turbulence, which is beneficial to maintaining the balance of the liquid level after mixing inside the clarification chamber 132.

[0050] The weir plate 16 in the same placement groove 12 is divided into two parts. Among them, the outer outlet 161 is divided into two. One part has a lower opening position and is the heavy phase outlet; the other part has a higher opening position and is the light phase outlet. The height of the outer outlet 161 is shorter, and the corresponding height of the inner outlet 162 is longer. Since the outer wall of the clarification chamber 132 is closely attached to the outer wall of the weir plate 16, the position where the liquid can flow is the overlapping area of the two, and the size of the available flow channel area is equal to the area of the outer outlet 161. When the lifting assembly 14 drives the placement seat 13 to lift and lower, the outlet position inside the clarification chamber 132 changes accordingly, so as to adjust the height of the internal liquid level.

[0051] There is an interfacial tension between the heavy phase liquid and the light phase liquid. Under the phase equilibrium state, the phase interface will remain relatively stable. Even if the heavy phase outlet of the weir plate 16 is lower and the pressure is greater, the existence of the phase interface will prevent the excessive outflow of the heavy phase liquid, so that the heavy phase liquid and the light phase liquid each maintain within a certain outflow ratio range. The heavy phase liquid has a larger viscosity and also has a greater resistance during the flow process, which will to a certain extent hinder the outflow of the heavy phase liquid and offset a part of the outflow volume advantage brought by the pressure difference; although the light phase liquid has a smaller pressure, it has a small viscosity and good fluidity, and can also maintain a certain flow rate under its own drive. Therefore, the outflow volumes of the two are not very different and can maintain a certain balance state.

[0052] After the light phase and the heavy phase are stably separated into the upper and lower sides, the light-phase liquid and the heavy-phase liquid flow out through their respective outlets, completing an extraction process. To improve the extraction effect, the device uses multiple placement tanks 12 in series. According to the liquid flow direction, it sequentially passes through the mixing chamber 131 and the clarification chamber 132. After entering the opening of the weir plate 16 from the clarification chamber 132, it enters the next set of mixing chamber 131 and clarification chamber 132 through a pipeline, and is connected in series with another set of mixing chamber 131 through the pipeline inside the weir plate 16 to form a multi-stage extraction tank group, enabling the rare earth raw material and the extractant to be mixed and separated multiple times in the placement tank 12, thereby realizing the efficient extraction and separation of the solute.

[0053] The process of moving the placement seat 13 downward:

[0054] When the rare earth raw material liquid and the extractant are filled in multiple sets of mixing chambers 131 and clarification chambers 132, the extraction of rare earth proceeds stably inside the box body 11. At this time, to improve the extraction purity and recovery rate, the lifting assembly 14 can be moved downward, making the depth inside the clarification chamber 132 deeper and the internal volume increase, which can effectively reduce the phase separation by the self-gravity sedimentation of the liquid during the clarification and separation stage. The solution depth is shallow, and the stratification line between the heavy phase and the light phase is blurred. For some systems with serious emulsification tendency or small particles, the phase separation speed is slow, and entrainment phenomenon is likely to occur, that is, one-phase liquid entrains too much of the other-phase liquid, resulting in poor extraction effect and low purity. The driving part drives the lead screw 143 to rotate inside it. The connecting plate 142 engaged with the thread on the outer surface of the lead screw 143 moves vertically downward under the guiding action of the connecting rod 141. At this time, the placement seat 13 is fixedly connected to the connecting plate 142 through the connecting rod 141 and moves downward together with the connecting plate 142, making the heights inside the mixing chamber 131 and the clarification chamber 132 deeper and their internal volumes larger.

[0055] When the placement base 13 moves downward, the clarification chamber 132 and the mixing chamber 131 move downward together. Since the rotating shaft 21 and the stirring paddle 22 are connected by a driving motor arranged on the upper part of the cover body, when the placement base 13 moves up and down through the lifting assembly 14, the relative position of the rotating shaft 21 and the stirring paddle 22 remains unchanged compared to the position of the box body 11, and a relative movement occurs between the rotating shaft 21 and the mixing chamber 131, and their positional relationship changes. In the initial state, the gap between the lower surface of the first bevel gear 231 at the bottom end of the rotating shaft 21 and the lower surface of the inner wall of the mixing chamber 131 is small. After the mixing chamber 131 gradually moves downward, the distance between the lower surface of the inner wall of the mixing chamber 131 and the lower surface of the first bevel gear 231 increases, and the height difference between the second bevel gear 232 and the first bevel gear 231 gradually decreases. As the two approach each other, the teeth of the first bevel gear 231 and the second bevel gear 232 mesh with each other, the rotating shaft 21 rotates, and the stirring paddle 22 and the first bevel gear 231 rotate together with the rotating shaft 21 through the driving motor. At the same time, the gear 233 is fixedly connected to the upper surface of the second bevel gear 232, and the inner parts of the two are rotatably connected to the outer surface of the support frame fixed on the inner wall of the mixing chamber 131. After the rotating shaft 21 rotates, the gear 233 is driven by the meshing transmission of the first bevel gear 231 and the second bevel gear 232, and drives the tooth ring 234 to rotate along the inner wall surface of the mixing chamber 131 on the outer surface of the support frame. The outer circumferential surfaces of the tooth ring 234 and the rotating plate 236 are both provided with sliding grooves, and slide along the upper and lower arc-shaped sliding rails on the circumferential inner wall of the clarification tank through the arc grooves.

[0056] The tooth ring 234, the rotating plate 236 and the stirring plate 235 rotate inside the mixing chamber 131. A plurality of stirring plates 235 are arranged around the circumference of the rotating shaft 21. Under the action of the gear 233, the rotating directions of the stirring paddle 22 and the stirring plate 235 are opposite, which will form a complex fluid flow phenomenon inside the mixing chamber 131, generate more eddy currents and shear forces, and can make the rare earth raw material liquid and the extraction liquid penetrate and stir more fully. The mass transfer rate of the solute between the two phases is accelerated, and the situation of uneven local mixing is avoided. The rotating forces in opposite directions contribute to the processes of droplet breakup and coalescence. On the one hand, the heavy phase and the light phase form smaller droplets, increasing the mass transfer area. On the other hand, the droplets will coalesce during the rotation process, which is beneficial to the subsequent phase separation.

[0057] The process of flowing out the residual light phase:

[0058] When the rare earth extraction is coming to an end, the feeding port of the mixing chamber 131 in the first placement tank 12 stops feeding, and the valve is in the closed state. As most of the organic light phase flows out, the remaining small amount of light phase, due to the loss of the driving and leading effects of the subsequent large amount of liquid, is difficult to completely flow to and out of the outlet on the weir plate 16 only by its own gravity and weak flow power. Especially when the interface between the light phase and the heavy phase in the clarification chamber 132 gradually decreases, the organic light phase near the outlet may remain due to insufficient power. Therefore, we need to move the placement seat 13 upward through the lifting assembly 14 so that the interface between the heavy phase and the light phase of the residual liquid in the clarification chamber 132 is in the middle of the light phase outlet and the heavy phase outlet on the outer surface of the weir plate 16. In the final stage, after the heavy phase flows out, in order to avoid the residual light phase liquid flowing out from the heavy phase outlet at the bottom of the weir plate 16, resulting in liquid phase entrainment and poor extraction effect, it is necessary to lift the placement seat 13 through the lifting assembly 14 so that the bottom of the inner wall of the clarification chamber 132 is slightly higher than the bottom of the light phase outlet on the outer surface of the weir plate 16, enabling the remaining light phase liquid to flow out smoothly from the light phase outlet at the weir plate 16. In each group of placement tanks 12, the rotating plate 236 at the bottom of the mixing chamber 131 adopts a conical design with a relatively high center point, which can flow the residual liquid into the clarification chamber 132. The bottom of the inner wall of the clarification chamber 132 adopts an inclined design. Under the action of natural gravity, the liquid naturally flows to the weir plate 16 and enters the next placement tank 12 through a pipeline. The bottom of the inner wall of the placement seat 13 in the next group of placement tanks 12 adopts a height reduction design compared with the bottom of the inner wall of the previous group of placement seats 13, which can minimize liquid residue, improve product utilization rate, and reduce resource waste.

[0059] To sum up, the equipment has the following advantages during the extraction process:

[0060] Advantage 1: The box body 11 and the placement seat 13 adopt a movable design. The lifting component 14 at the bottom of the box body 11 can drive the placement seat 13, the mixing chamber 131 and the clarification chamber 132 to move up and down inside the box body 11. The depths of the inner walls of the mixing chamber 131 and the clarification chamber 132 change. Correspondingly, the volumes inside the mixing chamber 131 and the clarification chamber 132 also change, so as to adapt to different production requirements: when the processing quantity increases, the lead screw 143 rotates to drive the connecting plate 142 to move downward, and the placement seat 13, the mixing chamber 131 and the clarification chamber 132 move downward synchronously. At this time, the distances between the mixing chamber 131 and the clarification chamber 132 and the bottom of the cover body become larger, the depths of their inner walls increase, and the volumes increase correspondingly, which can provide a larger space to accommodate more materials, ensure the residence time of rare earth materials inside the placement groove 12, and fully extract; when the processing quantity is less, it drives the connecting plate 142 to move upward, and the placement seat 13, the mixing chamber 131 and the clarification chamber 132 move upward synchronously. At this time, the distances between the mixing chamber 131 and the clarification chamber 132 and the bottom of the cover body become smaller, the depths of their inner walls decrease, and the volumes decrease correspondingly. The height difference between the bottom height of the inner wall of the clarification chamber 132 and the outer outlet 161 and the inner outlet 162 is small, and it can flow quickly, and it can use a smaller space to accurately separate the light phase and the heavy phase, improving the operating efficiency of the equipment.

[0061] Advantage 2: The mixing chamber 131 adopts a U-shaped design, and its inner wall is a smooth arc surface, which fits the side of the stirring plate 235 away from the rotating shaft 21. During the rotation of the stirring plate 235, in addition to mixing the liquid, it can also scrape the inner wall of the mixing chamber 131, avoiding the situation that the sediment in the rare earth raw material liquid adheres to the inner wall of the mixing chamber 131 and causes blockage, and ensuring the continuous and stable extraction process.

[0062] Advantage 3: When the production processing quantity is small, the depth of the inner wall of the mixing chamber 131 is relatively shallow, the first bevel gear 231 and the second bevel gear 232 do not contact, and only the stirring paddle 22 rotates inside the mixing chamber 131; when the production processing quantity is large, the lifting component 14 drives the placement seat 13 to move downward, the depth of the inner wall of the mixing chamber 131 is relatively deep, the first bevel gear 231 and the second bevel gear 232 are engaged, driving the stirring plate 235 to rotate together, and the rotation direction of the stirring plate 235 is opposite to that of the stirring paddle 22, which will form a complex fluid flow phenomenon inside the mixing chamber 131, generating more eddies and shear forces, which can make the rare earth raw material liquid and the extraction liquid penetrate and stir more fully, accelerating the mass transfer rate of the solute between the two phases, avoiding the situation of uneven local mixing, and automatically switching the stirring method according to the production processing quantity.

[0063] Advantage 4: The height of the flow port 152 on the inner wall of the clarification chamber 132 is lower than the height of the long flow port 151 on the baffle 15. The size of the flow port 152 plays a major role and can maintain the opening size at any height, avoiding the situation where the opening is too large due to height changes and a large amount of the two liquids flowing out into the clarification chamber 132 without being fully mixed inside the mixing chamber 131, ensuring the full mixing of the rare earth raw material liquid and the extraction liquid.

[0064] Advantage 5: A baffle 153 is provided above the flow port 152 on the side of the inner wall of the clarification chamber 132 close to the baffle 15. The width of the baffle 153 is greater than the width of the flow port 152, and the bottom of the baffle 153 is in contact with the side surface of the inner wall of the clarification chamber 132, which can prevent the liquid after mixing from entering the clarification chamber 132 and destroying the balance between the light phase and the heavy phase that have been stratified inside the clarification chamber 132 due to high flow rate and excessive turbulence, ensuring the stability of the liquid level inside the clarification chamber 132.

[0065] Advantage 6: At the end of the rare earth extraction, the lifting assembly 14 is used to precisely control the lifting of the placement seat 13, so that the interface between the heavy phase and the light phase in the clarification chamber 132 is in the middle of the light phase outlet and the heavy phase outlet on the outer surface of the weir plate 16. In the final stage, the placement seat 13 is lifted again, so that the bottom of the inner wall of the clarification chamber 132 is slightly higher than the bottom of the light phase outlet at the upper position on the outer surface of the weir plate 16, ensuring that the residual light phase liquid flows out from the correct outlet, avoiding liquid entrainment, and improving the extraction purity. The bottom of the inner wall of the clarification chamber 132 is designed in an inclined manner, with the side close to the mixing chamber 131 higher than the side close to the weir plate 16, which is beneficial to avoiding liquid residue. The heights of the lower surfaces of the inner walls of the plurality of placement seats 13 decrease in sequence along the liquid flow order, and the rotating plate 236 is designed in a conical shape with a higher middle and lower periphery, which is more conducive to throwing out the internal residual substances during rotation, and the liquid can flow out smoothly from the flow port 152. According to the requirements of different stages of the extraction process, the driving seat is precisely controlled to drive the lead screw 143 to rotate, adjust the height of the connecting plate 142 and the placement seat 13, and cooperate with the light and heavy phase outlet designs of the weir plate 16 to achieve the efficient and pure collection of the residual light phase liquid.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure, characterized in that: include: A placement portion (1), the placement portion (1) comprising a box body (11), a placement groove (12) being provided inside the box body (11), the placement groove (12) being provided in a plurality of groups, the inner wall of the placement groove (12) being slidably connected to a placement seat (13), a lifting assembly (14) for moving the placement seat (13) being provided at the bottom end of the box body (11), the placement seat (13) comprising a mixing chamber (131) and a clarifying chamber (132), the mixing chamber (131) and the clarifying chamber (132) being arranged in sequence along a liquid flow direction, and the heights of the plurality of placement seats (13) being successively reduced along a liquid flow sequence; A stirring portion (2), the stirring portion (2) comprising a rotating shaft (21) rotatably connected inside a mixing chamber (131), a stirring paddle (22) being fixedly connected to the bottom of the rotating shaft (21), and a mixing element (23) for enhancing a mixing effect being arranged inside the mixing chamber (131); The lifting assembly (14) comprises a connecting rod (141), the top end of the connecting rod (141) is fixedly connected to the lower surface of the placement seat (13), the bottom end of the connecting rod (141) passes through the box body (11) and is fixedly connected to a connecting plate (142), the lower surface of the box body (11) is fixedly connected to a driving seat, and the bottom end of the driving seat is drivingly connected to a screw rod (143) meshing with the inside of the connecting plate (142); The mixing element (23) comprises a bevel tooth 1 (231) sleeved on the outer surface of the rotating shaft (21); the mixing chamber (131) is rotatably connected to a bevel tooth 2 (232) meshing with the outer surface of the bevel tooth 1 (231) via a connecting frame fixed to the inner wall surface of the mixing chamber (131); a gear (233) is fixedly connected to the upper surface of the bevel tooth 2 (232); a gear ring (234) meshing with the outer surface of the gear (233) is slidably connected to the inner wall surface of the mixing chamber (131); the gear ring (234) is fixedly connected to a rotating plate (236) via a stirring plate (235) fixed to the lower surface of the stirring plate (236); the lower surface of the rotating plate (236) is rotatably connected to the bottom of the inner wall of the mixing chamber (131); a plurality of stirring plates (235) are provided and are distributed in a circular array around the axis of the rotating shaft (21).

2. The staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure according to claim 1, characterized in that: A baffle plate (15) fixedly connected to the inner wall of the placement groove (12) is slidably connected between the mixing chamber (131) and the clarifying chamber (132), and a weir plate (16) slidably connected to a side of the clarifying chamber (132) away from the baffle plate (15) is fixedly connected inside the placement groove (12).

3. The staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure according to claim 2, characterized in that: The inner wall of the mixing chamber (131) adopts a U-shaped design that fits the outer side of the stirring plate (235), the rotating plate (236) adopts a conical design that is high in the middle and low around, and the stirring plate (235) adopts an inclined design.

4. The staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure according to claim 2, characterized in that: The baffle plate (15) is provided with a long through opening (151) inside, the side of the clarification chamber (132) close to the baffle plate (15) is provided with a flow opening (152), the side of the inner wall surface of the clarification chamber (132) close to the baffle plate (15) is fixedly connected with a baffle plate (153), the side of the weir plate (16) close to the clarification chamber (132) is provided with an external outlet (161), and the side of the clarification chamber (132) close to the weir plate (16) is provided with an internal outlet (162).

5. The staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure according to claim 4, characterized in that: The baffle plate (153) is designed to be arc-shaped, and the bottom of the baffle plate (153) is close to a side of the inner wall of the clarification chamber (132) close to the baffle plate (15).

6. The staggered-layer reflux rare earth extraction tank group based on a liquid level balance structure according to claim 4, characterized in that: The bottom of the inner wall of the clarification chamber (132) is designed to be inclined, and the lowest point of the bottom of the inner wall of the clarification chamber (132) is close to one side of the weir plate (16).

Images