Rare earth extraction device

Abstract

The utility model discloses a rare earth extraction device. The rare earth extraction device comprises a tank body, a tank cover, a stirring device and a support frame, wherein a lower end sealing cover is buckled on the groove cover; the paddle shaft and the groove cover are sealed through a lower end sealing cover; the stirring device is further provided with a bearing seat, and an upper end sealing cover is arranged on the edge of the bearing seat. Liquid level monitoring devices are respectively arranged at the organic phase monitoring port and the water phase monitoring port; and the liquid level monitoring device and the tank cover are sealed through a monitoring opening sealing cover buckled on the tank cover. According to the utility model, the sealing mode of the extraction tank is improved, so that volatile substances can be prevented from overflowing.

Description

Technical Field

[0001] The utility model relates to a rare earth extraction device. Background Art

[0002] During the rare earth hydrometallurgy process, a box-type mixing and clarification extractor is typically used to mix an organic extractant and a diluent to create an extractant suitable for production requirements. The extractant is then mixed with an aqueous solution containing rare earth elements, and then clarified to separate the rare earth elements from each other and from non-rare earth elements.

[0003] Production demands necessitate monitoring of the tank's operating conditions, including monitoring the flow of organic and aqueous phases, sampling and analyzing the organic and aqueous phases, treating any emulsions that develop within the tank, and repairing the tank's agitator. Therefore, various functional holes must be opened in the tank cover to achieve these functions. If these holes are not properly sealed, volatile gases can escape, impacting the production plant environment. Currently, water seals are the primary solution to these problems, but these seals must be regularly inspected and refilled with water to ensure their effectiveness.

[0004] CN101219289A discloses a mixing and clarifying extraction tank suitable for high-flow-ratio solvent extraction. The two-phase mixing is driven by turbine stirring, which also serves as a pump for the two-phase fluid. The two phases are guided to the lower portion of the stirring axis in the mixing chamber by a flow guide pipe. The mixed phase is separated in the clarifying chamber, with the light phase flowing into the light phase box and entering the subsequent mixing chamber through the flow guide pipe. The heavy phase flows over the overflow plate of the heavy phase box and enters the previous mixing chamber. The two phases form a countercurrent pattern in the cascade device. A return pipe is provided in the clarifying chamber, connecting to the mixing chamber, ensuring that the mixed phase ratio of the two phases in the mixing chamber is less than 4 even when the two-phase flow ratio is high. The extraction box is surrounded by an insulation layer and a cover is provided on the top to maintain a constant temperature inside the tank. A water seal is used on the top of the extraction tank mixing chamber to recover volatile organic gases in the extraction tank.

[0005] CN203355355U discloses a water sealing device for a rare earth acid solution extraction tank unit, comprising a stirring tank, a stirring shaft being rotatably installed at the axis position of the stirring tank, a stirring blade being installed at the lower end of the stirring shaft, and a pulley being provided at the upper end of the stirring shaft; a cover plate being provided at the opening of the stirring tank, a bracket being fixedly installed on the upper part of the cover plate, and the stirring shaft being installed using a bearing; a water seal structure being provided at the junction of the cover plate and the stirring shaft, the water seal structure comprising a water seal groove provided at the bottom of the cover plate and a buckle cover sleeved on the stirring shaft, the lower edge of the buckle cover being immersed in the water of the water seal groove.

[0006] CN204004433U discloses a sealing device for a rare earth waste recovery and extraction tank, comprising a stirring tank and a stirring shaft, wherein the stirring shaft is provided with a stirring blade, a cover plate is provided on the stirring tank, a bracket is fixedly installed on the upper portion of the cover plate, and the stirring shaft is installed using a bearing, an opening with an annular water tank is provided at the junction of the cover plate and the stirring shaft, a sealing buckle plate is provided on the opening, the sealing buckle plate is provided with a partition matching the annular water tank, the partition is immersed in the water of the annular water tank, a sealing sleeve is provided on the outside of the stirring shaft, a lower sealing end cover and an upper sealing end cover are provided between the sealing buckle plate and the sealing sleeve, and a mechanical seal is provided between the lower sealing end cover and the upper sealing end cover.

[0007] CN211848084U This embodiment of the application discloses a rare earth extraction tank water seal device, comprising an extraction tank body, an extraction tank cover plate disposed on the top of the extraction tank body, a mounting bracket fixedly mounted on the top of the extraction tank cover plate, and a drive motor fixedly mounted on the top of the mounting bracket. By snapping a connecting plate into a first water tank, after the first water tank is filled with water, a water seal is formed between the extraction tank body and the extraction tank cover plate, thereby preventing the organic solvent in the extraction tank body from overflowing from the gap between the extraction tank body and the extraction tank cover plate, thereby improving the sealing performance of the device. By providing an iron core, after the reaction in the extraction tank body is completed, the extraction tank cover plate is separated from the extraction tank body, and the electromagnet is energized, the electromagnet attracts the iron core to move leftward, connecting the connecting hole with the drain pipe, and facilitating the discharge of water from the first water tank.

[0008] In summary, those skilled in the art have been trying to improve the sealing structure of the extraction tank to improve the sealing effect. However, the existing technical solutions are all various improvements on the water sealing method, which still cannot avoid the limitations of the water sealing method itself, especially the problem of the water seal at the paddle shaft. Figure 1 As shown in the figure, the water seal of the propeller shaft is divided into a water seal cover that rotates with the propeller shaft and a water seal groove fixed on the groove cover to store water. When the water seal cover rotates with the shaft, the speed can reach more than 200 rpm, which will cause water to splash out of the water seal groove. The operator must frequently observe the water level and replenish water in time, otherwise the sealing effect will not be achieved. Utility Model Content

[0009] In view of this, one object of the present invention is to provide a rare earth extraction device, which can achieve full sealing of the tank body and prevent volatile substances inside the tank body from overflowing through the gaps.

[0010] The utility model adopts the following technical solutions to achieve the above-mentioned purpose.

[0011] The utility model provides a rare earth extraction device, comprising a tank body, a tank cover, a base, a stirring device and a support frame;

[0012] The tank cover is covered on the opening of the tank body; the support frame is arranged on one side of the tank body;

[0013] The support frame includes a horizontal portion and a vertical portion; the vertical portion is fixed to the base, and the horizontal portion extends from the vertical portion toward the trough body and is located above the trough body;

[0014] The stirring device is fixed on the horizontal portion, and the stirring device has a stirring paddle, which passes through the tank cover and extends into the stirring chamber of the tank body; the stirring paddle has a paddle shaft, and a paddle is provided at the lower end of the paddle shaft;

[0015] The tank cover is buckled with a lower end sealing cover; the lower end sealing cover is a circular hollow structure, and the paddle shaft passes through the lower end sealing cover; the paddle shaft and the tank cover are sealed by the lower end sealing cover;

[0016] The stirring device further comprises a bearing seat, which is located on the lower surface of the horizontal portion; the bearing seat is located at the upper end of the paddle shaft; an upper end sealing cover is provided on the edge of the bearing seat for sealing the outer periphery of the bearing seat; the upper end sealing cover is a circular hollow structure; the upper end sealing cover is buckled on the horizontal portion;

[0017] The upper sealing cover and the lower sealing cover are sealed by a flexible connector;

[0018] The tank body is provided with a clarification chamber, an organic phase overflow box and a water phase overflow box; an organic phase monitoring port is provided at a position of the tank cover opposite to the clarification chamber or the organic phase overflow box, and a water phase monitoring port is provided at a position of the tank cover opposite to the water phase overflow box;

[0019] Liquid level monitoring devices are respectively provided at the organic phase monitoring port and the aqueous phase monitoring port for monitoring the liquid level; the liquid level monitoring device and the tank cover are sealed by a monitoring port sealing cover that is fastened to the tank cover; the monitoring port sealing cover is a circular hollow structure, and the liquid level monitoring device extends through the monitoring port sealing cover into the interior of the tank body, and its lower end is located at the upper part of the tank body.

[0020] According to the rare earth extraction device of the present invention, preferably, a sealing ring is provided between the upper sealing cover and the bearing seat;

[0021] A sealing gasket is provided between the lower end sealing cover and the slot cover, and bolts are added to fix them.

[0022] The utility model also provides another rare earth extraction device, comprising a tank body, a tank cover, a base, a stirring device and a support frame;

[0023] The tank cover is covered on the opening of the tank body; the support frame is arranged on one side of the tank body;

[0024] The support frame includes a horizontal portion and a vertical portion; the vertical portion is fixed to the base, and the horizontal portion extends from the vertical portion toward the trough body and is located above the trough body;

[0025] The stirring device is fixed on the horizontal portion, and the stirring device has a stirring paddle, which passes through the tank cover and extends into the stirring chamber of the tank body; the stirring paddle has a paddle shaft, and a paddle is provided at the lower end of the paddle shaft;

[0026] The tank cover is buckled with a lower end sealing cover; the lower end sealing cover is a circular hollow structure, and the paddle shaft passes through the lower end sealing cover; the paddle shaft and the tank cover are sealed by the lower end sealing cover;

[0027] A wear-resistant sealing ring is provided between the lower end sealing cover and the paddle shaft, and the wear-resistant sealing ring surrounds and is in close contact with the paddle shaft;

[0028] A water tank is provided above the lower end sealing cover; an opening is provided at the center of the bottom of the water tank, the paddle shaft passes through the opening, and the bottom of the water tank is in close contact with the lower end sealing cover;

[0029] The tank body is further provided with a clarification chamber, an organic phase overflow box and a water phase overflow box, an organic phase monitoring port is provided at a position of the tank cover opposite to the clarification chamber or the organic phase overflow box, and a water phase monitoring port is provided at a position of the tank cover opposite to the water phase overflow box;

[0030] Liquid level monitoring devices are respectively provided at the organic phase monitoring port and the aqueous phase monitoring port for monitoring the liquid level; the liquid level monitoring device and the tank cover are sealed by a monitoring port sealing cover that is fastened to the tank cover; the monitoring port sealing cover is a circular hollow structure, and the liquid level monitoring device passes through the monitoring port sealing cover.

[0031] According to the rare earth extraction device of the present invention, preferably, the contact surfaces between the wear-resistant sealing ring and the paddle shaft are both polished surfaces.

[0032] According to the rare earth extraction device of the present invention, preferably, the liquid level monitoring device includes a liquid level gauge casing and a liquid level gauge placed therein;

[0033] The probe of the liquid level meter of the liquid level monitoring device provided at the organic phase monitoring port is placed in the clarification chamber or in the organic phase overflow box;

[0034] The probe of the liquid level meter of the liquid level monitoring device arranged at the water phase monitoring port is placed in the water phase overflow box.

[0035] According to the rare earth extraction device of the present invention, preferably, the liquid level monitoring device further includes a liquid level sensor for feedback and warning of the upper and lower limits of the liquid level.

[0036] According to the rare earth extraction device of the present invention, preferably, the liquid level sensor is electrically connected to a probe of a corresponding liquid level meter.

[0037] According to the rare earth extraction device described in the present invention, preferably, the liquid level sensor includes an upper liquid level sensor and a lower liquid level sensor, and the upper liquid level sensor and the lower liquid level sensor are respectively fixed on the inner wall of the liquid level gauge casing and the part extending outside the tank body in an upper and lower order.

[0038] According to the rare earth extraction device described in the present invention, preferably, it also includes a first sampling tube, a first sampling valve, a second sampling tube and a second sampling valve; wherein, the first end of the first sampling tube is connected to the aqueous phase overflow box, and the second end passes through the tank body; the first sampling valve is arranged on the section of the first sampling tube located outside the tank body; the first end of the second sampling tube is connected to the organic phase overflow box, and the second end passes through the tank body; the second sampling valve is arranged on the section of the second sampling tube located outside the tank body.

[0039] According to the rare earth extraction device of the present invention, preferably, the first sampling tube is arranged below the half line of the box body of the aqueous phase overflow box; the second sampling tube is arranged above the half line of the box body of the organic phase overflow box.

[0040] The utility model changes the sealing mode between the stirring shaft and the tank body, uses a liquid level monitoring device to replace manual monitoring, and changes the sampling mode, thereby canceling the water seal of the extraction tank and preventing the overflow of volatile substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of an existing extraction tank;

[0042] Figure 2 This is a cross-sectional diagram of the rare earth extraction device of the present invention. Figure 1 ;

[0043] Figure 3 This is a cross-sectional diagram of the rare earth extraction device of the present invention. Figure 2 ;

[0044] Figure 4 for Figure 2 Schematic diagram of the enlarged portion A of FIG.

[0045] Figure 5 for Figure 3 Schematic diagram of the enlarged portion A of FIG.

[0046] Figure 6 for Figure 2 Schematic diagram of the enlarged portion B.

[0047] Reference numerals

[0048] 1-tank body; 2-stirring device, 21-bearing seat, 22-paddle shaft, 23-paddle blade; 3-tank cover; 4-lower end sealing cover; 5-upper end sealing cover; 6-flexible connector; 7-water tank; 8-wear-resistant sealing ring; 9-liquid level monitoring device, 91-liquid level gauge, 92-liquid level gauge casing, 93-liquid level sensor, 931-upper liquid level sensor, 932-lower liquid level sensor; 10-organic phase monitoring port; 11-aqueous phase monitoring port; 12-organic phase overflow box; 13-aqueous phase overflow box; 14-first sampling tube; 15-first sampling valve; 16-clarification chamber; 17-aqueous phase regulator; 18-organic phase liquid level; 19-aqueous phase liquid level; 20-interface; 30-monitoring port sealing cover. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0050] The "half line" mentioned in the present invention refers to: at the midpoint of the central axis from the container mouth to the container bottom, any straight line on the plane passing through the midpoint and perpendicular to the central axis is the "half line".

[0051] The "upper third line" mentioned in this utility model refers to any straight line on a plane perpendicular to the central axis, passing through a point located one-third of the way from the container's centerline to the container's bottom. The same applies to other lines above the "half-way line."

[0052] The "lower third line" mentioned in this utility model refers to any straight line on a plane perpendicular to the central axis, passing through a point located one-third of the way from the central axis of the container to the container opening. The same applies to other lines below the "half line."

[0053] The present invention provides a rare earth extraction device for extracting and separating rare earth metal elements during the rare earth metal hydrometallurgy process. The organic phase used in the present invention serves as the extractant, and the aqueous phase serves as the solvent in the original rare earth metal solution. Both the organic phase and the aqueous phase are well known in the art.

[0054] The rare earth extraction device of the present invention includes a tank body, a tank cover, a base, a stirring device, a support frame, an upper sealing cover, a lower sealing cover, a clarification chamber, an organic phase overflow box, an aqueous phase overflow box, a liquid level monitoring device, a sampling tube, and a sampling valve. A detailed description is provided below.

[0055] <Trunk body, tank cover, base, stirring device, support frame, upper sealing cover and lower sealing cover>

[0056] The tank body of the utility model is the main body container of the rare earth extraction device, and is used for carrying the internal components of the rare earth extraction device as well as the organic phase and the aqueous phase.

[0057] The tank cover of the present invention is a cover for a rare earth extraction device, used to cover the opening of the tank body to keep the tank body sealed. The tank cover and the tank body can be sealed using adhesive sealing, rubber ring sealing, packing sealing, vacuum sealing, or welding sealing. Preferably, welding sealing is used.

[0058] The stirring device of the present invention is used for stirring within the mixing chamber of an extraction device. It includes a stirring paddle and a drive device. The support frame of the present invention is a support device well known in the art, and the stirring device is fixed to the tank body via the support frame. The support frame is disposed on one side of the tank body.

[0059] The support frame includes a horizontal portion and a vertical portion. The vertical portion is fixed to the base. The horizontal portion extends from the vertical portion toward the trough body and is located above the trough body. Preferably, the horizontal portion extends less than 1 / 3 of the length of the trough body. The stirring device is fixed to the horizontal portion. Its drive device is placed on the horizontal portion.

[0060] The stirring device of the present invention comprises a stirring paddle and a bearing seat. The stirring paddle extends through the tank cover and into the stirring chamber of the tank body. The stirring chamber is a component of an extraction device known in the art. The stirring paddle of the stirring device comprises a paddle shaft. The lower end of the paddle shaft is provided with a paddle blade; the upper end of the paddle shaft is connected to the bearing seat.

[0061] The utility model has a lower end sealing cover fastened to the slot cover. The lower end sealing cover is a circular hollow structure. The paddle shaft passes through the lower end sealing cover. The paddle shaft and the slot cover are sealed by the lower end sealing cover.

[0062] The bearing seat is located on the lower surface of the horizontal portion. An upper sealing cover is provided on the edge of the bearing seat to seal the outer periphery of the bearing seat. The upper sealing cover is a circular hollow structure and is snapped onto the bearing seat.

[0063] The upper sealing cover and the lower sealing cover are sealed and connected by a flexible connector. The flexible connector of the present invention can be made of existing materials. The flexible connector preferably uses at least one of silicone, thermoplastic polyurethane, and polytetrafluoroethylene, and more preferably polytetrafluoroethylene. The present invention uses a flexible connection to seal the propeller shaft and the bearing seat, which is convenient for disassembly and maintenance. At the same time, this sealing method transforms the dynamic and static sealing of the existing water seal into a static sealing, reducing the sealing difficulty while improving the sealing effect. The flexible connector is preferably in the shape of a circular tube.

[0064] According to one embodiment of the present invention, the lower end sealing cover surrounds the propeller shaft, and the axial cross-section of the lower end sealing cover (the cross-section passing through the axis of the propeller shaft) is a symmetrical "L"-shaped structure, the vertical side of the "L"-shaped structure is fitted to the lower part of the inner circumference of the flexible connector, and the horizontal side of the "L"-shaped structure is fitted to the upper surface of the slot cover.

[0065] According to another embodiment of the present invention, the upper end sealing cover surrounds the outer wall of the bearing seat, and the axial cross-section of the upper end sealing cover (the cross-section passing through the axis of the propeller shaft) is two symmetrical "T"-shaped structures, the vertical side of the "T"-shaped structure is fitted to the upper part of the inner circumference of the flexible connector, the side of the horizontal side of the "T"-shaped structure is fitted to the outer wall of the bearing seat, and the top surface of the horizontal side of the "T"-shaped structure is fitted to the lower surface of the horizontal part.

[0066] Furthermore, in order to achieve a better sealing effect, a sealing ring can be set between the upper sealing cover and the bearing seat; a sealing gasket can be set between the lower sealing cover and the slot cover, and bolts can be added to fix them.

[0067] The sealing ring and the sealing gasket involved in the present invention can be made of existing materials. Preferably, the sealing ring and the sealing gasket are made of at least one of fluororubber, nitrile rubber, chloroprene rubber, propylene rubber, and polytetrafluoroethylene, more preferably fluororubber or polytetrafluoroethylene.

[0068] According to another embodiment of the present invention, a wear-resistant sealing ring is provided between the lower end sealing cover and the paddle shaft. The wear-resistant sealing ring surrounds and is in close contact with the paddle shaft. A water tank is provided above the lower end sealing cover. Water is added to the water tank for lubrication. An opening is provided at the bottom center of the water tank. The paddle shaft passes through the opening at the bottom of the water tank. The bottom of the water tank is in close contact with the lower end sealing cover. Since this sealing method can already achieve good sealing between the lower end sealing cover and the paddle shaft, in order to save costs, it is no longer necessary to perform sealing treatment on the end of the paddle shaft, and it is no longer necessary to provide an upper end sealing cover and a flexible connector.

[0069] According to one embodiment of the present invention, the axial cross-section of the wear-resistant sealing ring (the cross-section passing through the axis of the propeller shaft) is two symmetrical rectangular structures, and the inner short sides of the two rectangular structures are in close contact with the propeller shaft.

[0070] The lower end sealing cover surrounds the paddle shaft, and the axial cross-section of the lower end sealing cover (the cross-section passing through the axis of the paddle shaft) is two symmetrical inverted "T"-shaped structures. The bottom surface of the horizontal side of the inverted "T"-shaped structure is in contact with the upper surface of the tank cover, the side surface of the horizontal side of the inverted "T"-shaped structure is in contact with the outer peripheral surface of the wear-resistant sealing ring, and the vertical side of the inverted "T"-shaped structure is in contact with the outer peripheral surface of the water tank.

[0071] In order to achieve a better sealing effect, an additional sealing gasket can be provided between the lower sealing cover and the slot cover, and bolts can be added to fix them.

[0072] The wear-resistant sealing ring of the present invention can be made of existing materials. The wear-resistant sealing ring is preferably made of at least one of fluororubber, aramid, silicon carbide, alumina ceramics, and polytetrafluoroethylene, and more preferably silicon carbide, alumina ceramics, or polytetrafluoroethylene.

[0073] According to another embodiment of the present invention, the contact surfaces between the wear-resistant sealing ring and the paddle shaft are polished. The polished surfaces of the paddle shaft and the wear-resistant sealing ring, combined with the water in the water tank, can ensure a seal while better achieving smooth rotation of the paddle shaft.

[0074] The upper and lower sealing covers of the present invention can be made of existing materials. The sealing covers are preferably made of at least one of fluororubber, nitrile rubber, chloroprene rubber, propylene rubber, polytetrafluoroethylene, and carbon fiber, and more preferably fluororubber or polytetrafluoroethylene.

[0075] <Clarification chamber, organic phase overflow box, aqueous phase overflow box and liquid level monitoring device>

[0076] The tank body of the utility model is provided with a clarification chamber, an organic phase overflow box and an aqueous phase overflow box, which are components in an extraction device known in the art.

[0077] The utility model provides an organic phase monitoring port at a position on the tank cover opposite the clarification chamber or the organic phase overflow box. A water phase monitoring port is also provided at a position on the tank cover opposite the water phase overflow box. Since the organic phase in the extraction device is located above the liquid in the clarification chamber and within the organic phase overflow box, the organic phase can be monitored regardless of whether the organic phase monitoring port is located at any position on the tank cover opposite the clarification chamber or the organic phase overflow box.

[0078] This utility model provides liquid level monitoring devices at both the organic phase monitoring port and the aqueous phase monitoring port for monitoring the liquid level. The liquid level monitoring devices are sealed from the tank cover by a monitoring port sealing cover that snaps onto the tank cover. The monitoring port sealing cover is a circular, hollow structure. The liquid level monitoring devices extend through the monitoring port sealing cover into the tank body, with their lower end positioned above the tank body.

[0079] According to one embodiment of the present invention, the monitoring port sealing cover surrounds the liquid level monitoring device. A transaxial cross-section of the monitoring port sealing cover (a cross-section along the propeller shaft axis) forms two symmetrical rectangular structures. The long sides of the rectangular structures are perpendicular to the propeller shaft axis. The inner short sides of the rectangular structures mate with the liquid level monitoring device. The long sides of the bottom sides of the rectangular structures mate with the upper surface of the tank cover.

[0080] The monitoring port sealing cover of the present invention can be made of existing materials. The sealing cover is preferably made of at least one of fluororubber, nitrile rubber, chloroprene rubber, propylene rubber, polytetrafluoroethylene, and carbon fiber, and more preferably fluororubber or polytetrafluoroethylene.

[0081] According to an embodiment of the present invention, a liquid level monitoring device includes a liquid level gauge casing and a liquid level gauge disposed therein.

[0082] The probe of the liquid level gauge of the liquid level monitoring device provided at the organic phase monitoring port is placed within the clarification chamber or within the organic phase overflow box. When the probe is placed within the clarification chamber, it can be positioned at any location within the clarification chamber that can monitor the upper and lower limits of the organic phase liquid level. It is preferably positioned above the halfway mark within the clarification chamber, and more preferably between the upper tenth mark and the upper fifth mark within the clarification chamber.

[0083] When the probe is placed in the organic phase overflow box, it can be set at any position in the organic phase overflow box that can monitor the upper and lower limits of the organic phase liquid level. The probe is preferably set above the halfway line in the organic phase overflow box, and more preferably between the upper tenth line and the upper fifth line in the organic phase overflow box.

[0084] The probe of the liquid level gauge of the liquid level monitoring device installed at the water phase monitoring port is placed in the water phase overflow box. The probe can be placed at any location within the water phase overflow box that can monitor the upper and lower limits of the water phase liquid level. The probe is preferably placed above the halfway line within the water phase overflow box, and more preferably between the upper tenth line and the upper fifth line within the water phase overflow box. Because the water phase regulator is located within the water phase overflow box, care should be taken to avoid contact between the probe and the regulator when setting the liquid level gauge.

[0085] According to another embodiment of the present invention, the liquid level monitoring device further includes a liquid level sensor for providing feedback and warning of the upper and lower limits of the liquid level.

[0086] According to another embodiment of the present invention, the liquid level sensor is electrically connected to a probe of a corresponding liquid level meter.

[0087] The liquid level sensor used in the present invention can be an existing liquid level sensor. The liquid level sensor is preferably at least one of a float type liquid level sensor, a float type liquid level sensor, a static pressure type liquid level sensor, a capacitive type liquid level sensor, and a photoelectric liquid level sensor, and more preferably at least one of a float type liquid level sensor, a static pressure type liquid level sensor, and a capacitive type liquid level sensor.

[0088] The electrical connection between the liquid level sensor and the probe can be an existing electrical connection method, preferably at least one of a wire connection, a cable connection, a plug and socket connection, a junction box connection, and a wireless connection, more preferably at least one of a wire connection, a cable connection, and a plug and socket connection.

[0089] According to another embodiment of the present invention, to better monitor the liquid level, the liquid level sensor can be divided into an upper liquid level sensor and a lower liquid level sensor. These sensors are used to monitor the upper and lower limits of the liquid level, respectively. The upper and lower liquid level sensors are fixed to the inner wall of the level gauge sleeve, extending outside the slot, in an upper and lower order, to facilitate liquid level monitoring.

[0090] The normal liquid level is when the level gauge probe is between the upper and lower level sensors. When the liquid level drops and the level gauge probe contacts the lower level sensor, the lower level sensor issues a switching signal, triggering a low level alarm. When the liquid level rises and the level gauge probe contacts the upper level sensor, the upper level sensor issues a switching signal, triggering a high level alarm.

[0091] When the liquid level is low, the level gauge probe can be installed at the lower level sensor. The lower level sensor is normally closed. When the liquid level rises and the level gauge probe leaves the lower level sensor, the lower level sensor issues a switching signal to indicate a high level alarm. If the liquid level continues to rise, the level gauge probe contacts the upper level sensor, which then issues a switching signal to indicate an excessively high level alarm.

[0092] The specific alarm method to be adopted can be realized by compiling a conventional control program according to the actual situation in the tank.

[0093] The utility model uses a liquid level monitoring device to replace the original liquid level monitoring through the sampling port, realizes the use of a sealing cover to seal instead of a water seal, and improves the sealing performance of the rare earth extraction device without affecting the liquid level monitoring.

[0094] <Sampling tube and sampling valve>

[0095] The utility model comprises a first sampling tube, a first sampling valve, a second sampling tube, and a second sampling valve. The first end of the first sampling tube is connected to the water phase overflow box, and the second end passes through the tank body; the first sampling valve is arranged on the section of the first sampling tube located outside the tank body; the first end of the second sampling tube is connected to the organic phase overflow box, and the second end passes through the tank body; the second sampling valve is arranged on the section of the second sampling tube located outside the tank body.

[0096] According to one embodiment of the present invention, the seals between the first sampling tube and the aqueous phase overflow box, between the first sampling tube and the tank body, between the second sampling tube and the organic phase overflow box, and between the second sampling tube and the tank body can all be sealed using existing sealing methods, such as, but not limited to, sealing rings. The sealing rings are preferably made of at least one of fluororubber, nitrile rubber, chloroprene rubber, propylene rubber, polytetrafluoroethylene, and carbon fiber, with fluororubber or polytetrafluoroethylene being more preferred.

[0097] The first sampling tube and the second sampling tube in the present invention can both use existing corrosion-resistant pipes, and are not particularly limited here. The first sampling valve and the second sampling valve in the present invention can use existing corrosion-resistant valves, and are not particularly limited here.

[0098] According to one embodiment of the present invention, when the liquid in the extraction device is separated into layers, the organic phase is on top and the aqueous phase is on the bottom. Therefore, the first sampling tube at the aqueous phase overflow box is preferably located below the halfway line of the aqueous phase overflow box, more preferably between the lower third line and the lower fifth line of the aqueous phase overflow box; the second sampling tube at the organic phase overflow box is preferably located above the halfway line of the organic phase overflow box, more preferably between the upper third line and the upper fifth line of the organic phase overflow box.

[0099] The utility model uses a sampling tube and a sampling valve to replace the original sampling port for sampling, thereby canceling the water seal at the sampling port, and improving the sealing performance of the rare earth extraction device without affecting sampling.

[0100] Example 1

[0101] like Figure 2 As shown, the rare earth extraction device of this embodiment includes a tank body 1, a tank cover 3, a base (not shown), a stirring device 2 and a support frame (not shown). The tank cover 3 covers the opening of the tank body 1. The support frame is set on one side of the tank body 1 and includes a horizontal part and a vertical part. The vertical part is fixed on the base, and the horizontal part extends from the vertical part toward the tank body 1 and is located above the tank body 1. Figure 2 As shown, the horizontal portion extends less than one-third of the length of the tank body 1. A stirring device 2 is fixed to the horizontal portion, and its drive device (not shown) is placed on the horizontal portion. The stirring paddle of the stirring device 2 extends through the tank cover 3 into the mixing chamber (not shown) of the tank body 1. Preferably, the tank cover 3 and the tank body 1 are sealed by welding.

[0102] like Figure 2 As shown, the stirring paddle of the stirring device 2 has a paddle shaft 22. A paddle blade 23 is provided at the lower end of the paddle shaft 22. A lower end sealing cover 4 is fastened to the tank cover 3. The lower end sealing cover 4 is a circular hollow structure. The paddle shaft 22 passes through the lower end sealing cover 4. The lower end sealing cover 4 seals the paddle shaft 22 and the tank cover 3.

[0103] like Figure 4 As shown, the stirring device 2 further includes a bearing seat 21, which is located on the lower surface of the horizontal portion. The bearing seat 21 is located at the upper end of the paddle shaft 22. An upper sealing cap 5 is provided on the edge of the bearing seat 21 to seal the outer periphery of the bearing seat. The upper sealing cap 5 is a circular hollow structure that snaps onto the horizontal portion.

[0104] like Figure 4 As shown, a sealing ring is provided between the upper sealing cover 5 and the bearing seat 21. A sealing gasket is provided between the lower sealing cover 4 and the tank cover 3, and bolts are added to secure them. The upper sealing cover 5 and the lower sealing cover 4 are sealed together by a flexible connector 6. The flexible connector 6 is in the shape of a circular tube.

[0105] like Figure 4 As shown, the lower end sealing cover 4 surrounds the propeller shaft 22. The axial section of the lower end sealing cover 4 (the section passing through the axis of the propeller shaft) is two symmetrical "L"-shaped structures, and the vertical side of the "L"-shaped structure is affixed to the lower part of the inner circumference of the flexible connector 6. The horizontal side of the "L"-shaped structure is affixed to the upper surface of the groove cover 3. The upper end sealing cover 5 surrounds the outer wall of the bearing seat 21. The axial section of the upper end sealing cover 5 (the section passing through the axis of the propeller shaft) is two symmetrical "T"-shaped structures, and the vertical side of the "T"-shaped structure is affixed to the upper part of the inner circumference of the flexible connector 6, the side of the horizontal side of the "T"-shaped structure is affixed to the outer wall of the bearing seat 21, and the top surface of the horizontal side of the "T"-shaped structure is affixed to the lower surface of the horizontal part.

[0106] The upper sealing cover 5, the lower sealing cover 4, the sealing ring and the sealing gasket are all made of fluororubber. The soft connector 6 is made of polytetrafluoroethylene.

[0107] like Figure 2 As shown, the tank body 1 is provided with a clarification chamber 16, an organic phase overflow box 12, and an aqueous phase overflow box 13, sequentially arranged from left to right. The clarification chamber 16 is located to one side of the stirring chamber. An organic phase monitoring port 10 is provided on the tank cover 3 at a position opposite the clarification chamber 16 or the organic phase overflow box 12. An aqueous phase monitoring port 11 is provided on the tank cover 3 at a position opposite the aqueous phase overflow box 13.

[0108] like Figure 6 As shown, a liquid level monitoring device 9 is provided at the organic phase monitoring port 10 and the aqueous phase monitoring port 11, respectively, for monitoring the liquid level. The liquid level monitoring device 9 is sealed from the tank cover 3 by a monitoring port sealing cover 30 that snaps onto the tank cover 3. The monitoring port sealing cover 30 is a circular hollow structure. The liquid level monitoring device 9 extends through the monitoring port sealing cover 30 into the interior of the tank body 1, with its lower end located at the upper portion of the tank body. The monitoring port sealing cover 30 of this embodiment is made of fluororubber.

[0109] like Figure 6 As shown, the monitoring port sealing cover 30 surrounds the liquid level monitoring device 9. The axial cross-section of the monitoring port sealing cover 30 (a cross-section passing through the propeller shaft axis) forms two symmetrical rectangular structures. The long sides of the rectangular structures are perpendicular to the propeller shaft axis, the inner short sides of the rectangular structures are in contact with the liquid level monitoring device 9, and the bottom long sides of the rectangular structures are in contact with the upper surface of the tank cover 3.

[0110] like Figure 6As shown, the liquid level monitoring device 9 includes a liquid level gauge sleeve 92 and a liquid level gauge 91 disposed therein. For the liquid level monitoring device 9 at the organic phase monitoring port 10, the probe of the liquid level gauge 91 is positioned at the upper sixth line of the clarification chamber. For the liquid level monitoring device 9 at the aqueous phase monitoring port 11, the probe of the liquid level gauge 91 is positioned at the upper sixth line of the aqueous phase overflow box 13, away from the aqueous phase regulator 17.

[0111] The liquid level monitoring device 9 also includes a liquid level sensor 93 for providing feedback and warning of the upper and lower limits of the liquid level. The liquid level sensor 93 in this embodiment is a static pressure type liquid level sensor. The liquid level sensor 93 is connected to the probe of the liquid level meter 91 by an electric wire.

[0112] The liquid level sensor 93 includes an upper liquid level sensor 931 and a lower liquid level sensor 932. The upper liquid level sensor 931 and the lower liquid level sensor 932 are fixed to the inner wall of the liquid level gauge sleeve 92 and the part thereof extending out of the tank body in an upper and lower order.

[0113] The normal liquid level is when the probe of liquid level gauge 91 is between upper liquid level sensor 931 and lower liquid level sensor 932. When the liquid level drops and the probe of liquid level gauge 91 contacts lower liquid level sensor 932, lower liquid level sensor 932 issues a switching signal, triggering a low liquid level alarm. When the liquid level rises and the probe of liquid level gauge 91 contacts upper liquid level sensor 931, upper liquid level sensor 931 issues a switching signal, triggering a high liquid level alarm.

[0114] like Figure 2 As shown, the rare earth extraction device of this embodiment further includes a first sampling tube 14, a first sampling valve 15, a second sampling tube, and a second sampling valve (not shown). The first end of the first sampling tube 14 is connected to the aqueous phase overflow box 13, and the second end passes through the tank body 1. The first sampling valve 15 is disposed in the section of the first sampling tube 14 located outside the tank body 1. The first end of the second sampling tube is connected to the organic phase overflow box 12, and the second end passes through the tank body 1. The second sampling valve is disposed in the section of the second sampling tube located outside the tank body 1.

[0115] Fluororubber sealing rings are used to seal between the first sampling tube 14 and the water phase overflow box 13 , between the first sampling tube 14 and the tank body 1 , between the second sampling tube and the organic overflow box 12 , and between the second sampling tube and the tank body 1 .

[0116] The first sampling tube 14 located at the aqueous phase overflow box 13 is arranged at the lower quarter line of the box body of the aqueous phase overflow box 13. The second sampling tube located at the organic phase overflow box 12 is arranged at the upper quarter line of the box body of the organic phase overflow box 12.

[0117] When extracting rare earth elements using the rare earth extraction device of this embodiment, an extractant and an aqueous solution containing rare earth elements are injected into the stirring chamber of tank body 1, where the stirring paddle is located. After being stirred by blades 23 of stirring device 2, the mixed solution enters clarification chamber 16 and is allowed to stand and separate into layers, forming an organic phase at interface 20 and an aqueous phase below interface 20. The organic phase liquid level 18 and the aqueous phase liquid level 19 are respectively monitored by liquid level monitoring device 9. When the liquid level reaches the upper limit, an upper liquid level sensor 931 alarms; when the liquid level reaches the lower limit, a lower liquid level sensor 932 alarms.

[0118] The sampling and testing of the organic phase and the aqueous phase are carried out through the second sampling tube at the organic phase overflow box 12 and the first sampling tube 14 at the aqueous phase overflow box 13 respectively.

[0119] After the extraction is completed, the organic phase flows out through the organic overflow box 12 , and the aqueous phase flows out through the aqueous phase overflow box 13 .

[0120] In the rare earth extraction device of this embodiment, since sealing covers or sealing rings are used to seal between the paddle shaft and the tank cover, the organic phase monitoring port, the aqueous phase monitoring port, and the sampling tube and the tank body, volatile substances are not likely to overflow, which is more conducive to environmental protection.

[0121] Example 2

[0122] The only difference between this embodiment and embodiment 1 is that the sealing method between the propeller shaft and the slot cover is different, and this embodiment does not include the upper end sealing cover 5 and the flexible connector 6.

[0123] like Figure 3 and Figure 5 As shown, in this embodiment, a wear-resistant sealing ring 8 is disposed between the lower sealing cover 4 and the paddle shaft 22. The wear-resistant sealing ring 8 surrounds and closely adheres to the paddle shaft 22. The contact surfaces of the wear-resistant sealing ring 8 and the paddle shaft 22 are both polished. Furthermore, a water tank 7 is disposed above the lower sealing cover 4. The paddle shaft passes through an opening at the bottom of the water tank 7. The bottom of the water tank 7 closely adheres to the lower sealing cover 4. Water is added to the water tank 7 for lubrication.

[0124] The axial cross-section (a cross-section passing through the paddle shaft axis) of the wear-resistant sealing ring 8 of this embodiment forms two symmetrical rectangular structures, with the inner short sides of the two rectangular structures closely contacting the paddle shaft 22. The lower end sealing cover 4 surrounds the paddle shaft 22, and the axial cross-section (a cross-section passing through the paddle shaft axis) of the lower end sealing cover 4 forms two symmetrical inverted "T"-shaped structures. The bottom surfaces of the horizontal sides of the inverted "T"-shaped structures contact the upper surface of the tank cover, the side surfaces of the horizontal sides of the inverted "T"-shaped structures contact the outer circumference of the wear-resistant sealing ring, and the vertical sides of the inverted "T"-shaped structures contact the outer circumference of the water tank.

[0125] A sealing gasket is provided between the lower end sealing cover 4 and the tank cover 3, and bolts are added to fix them.

[0126] In this embodiment, the wear-resistant sealing ring is made of polytetrafluoroethylene, and the sealing gasket is made of fluororubber.

[0127] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement, and substitution that can be thought of by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A rare earth extraction device, characterized in that: It includes a tank body, a tank cover, a base, a stirring device and a support frame; The tank cover is covered on the opening of the tank body; the support frame is arranged on one side of the tank body; The support frame includes a horizontal portion and a vertical portion; the vertical portion is fixed to the base, and the horizontal portion extends from the vertical portion toward the trough body and is located above the trough body; The stirring device is fixed on the horizontal portion, and the stirring device has a stirring paddle, which passes through the tank cover and extends into the stirring chamber of the tank body; the stirring paddle has a paddle shaft, and a paddle is provided at the lower end of the paddle shaft; The tank cover is buckled with a lower end sealing cover; the lower end sealing cover is a circular hollow structure, and the paddle shaft passes through the lower end sealing cover; the paddle shaft and the tank cover are sealed by the lower end sealing cover; The stirring device further comprises a bearing seat, which is located on the lower surface of the horizontal portion; the bearing seat is located at the upper end of the paddle shaft; an upper end sealing cover is provided on the edge of the bearing seat for sealing the outer periphery of the bearing seat; the upper end sealing cover is a circular hollow structure; the upper end sealing cover is buckled on the horizontal portion; The upper sealing cover and the lower sealing cover are sealed by a flexible connector; The tank body is provided with a clarification chamber, an organic phase overflow box and a water phase overflow box; an organic phase monitoring port is provided at a position of the tank cover opposite to the clarification chamber or the organic phase overflow box, and a water phase monitoring port is provided at a position of the tank cover opposite to the water phase overflow box; Liquid level monitoring devices are respectively provided at the organic phase monitoring port and the aqueous phase monitoring port for monitoring the liquid level; the liquid level monitoring device and the tank cover are sealed by a monitoring port sealing cover that is fastened to the tank cover; the monitoring port sealing cover is a circular hollow structure, and the liquid level monitoring device extends through the monitoring port sealing cover into the interior of the tank body, and its lower end is located at the upper part of the tank body.

2. The rare earth extraction device according to claim 1, characterized in that: A sealing ring is provided between the upper sealing cover and the bearing seat; A sealing gasket is provided between the lower end sealing cover and the slot cover, and bolts are added to fix them.

3. A rare earth extraction device, characterized in that: It includes a tank body, a tank cover, a base, a stirring device and a support frame; The tank cover is covered on the opening of the tank body; the support frame is arranged on one side of the tank body; The support frame includes a horizontal portion and a vertical portion; the vertical portion is fixed to the base, and the horizontal portion extends from the vertical portion toward the trough body and is located above the trough body; The stirring device is fixed on the horizontal portion, and the stirring device has a stirring paddle, which passes through the tank cover and extends into the stirring chamber of the tank body; the stirring paddle has a paddle shaft, and a paddle is provided at the lower end of the paddle shaft; The tank cover is buckled with a lower end sealing cover; the lower end sealing cover is a circular hollow structure, and the paddle shaft passes through the lower end sealing cover; the paddle shaft and the tank cover are sealed by the lower end sealing cover; A wear-resistant sealing ring is provided between the lower end sealing cover and the paddle shaft, and the wear-resistant sealing ring surrounds and is in close contact with the paddle shaft; A water tank is provided above the lower end sealing cover; an opening is provided at the center of the bottom of the water tank, the paddle shaft passes through the opening, and the bottom of the water tank is in close contact with the lower end sealing cover; The tank body is further provided with a clarification chamber, an organic phase overflow box and a water phase overflow box, an organic phase monitoring port is provided at a position of the tank cover opposite to the clarification chamber or the organic phase overflow box, and a water phase monitoring port is provided at a position of the tank cover opposite to the water phase overflow box; Liquid level monitoring devices are respectively provided at the organic phase monitoring port and the aqueous phase monitoring port for monitoring the liquid level; the liquid level monitoring device and the tank cover are sealed by a monitoring port sealing cover that is fastened to the tank cover; the monitoring port sealing cover is a circular hollow structure, and the liquid level monitoring device passes through the monitoring port sealing cover.

4. The rare earth extraction device according to claim 3, characterized in that: The contact surfaces of the wear-resistant sealing ring and the paddle shaft are both polished surfaces.

5. The rare earth extraction device according to claim 1 or 3, characterized in that: The liquid level monitoring device includes a liquid level gauge casing and a liquid level gauge placed therein; The probe of the liquid level meter of the liquid level monitoring device provided at the organic phase monitoring port is placed in the clarification chamber or in the organic phase overflow box; The probe of the liquid level meter of the liquid level monitoring device arranged at the water phase monitoring port is placed in the water phase overflow box.

6. The rare earth extraction device according to claim 5, characterized in that: The liquid level monitoring device also includes a liquid level sensor for feedback and warning of the upper and lower limits of the liquid level.

7. The rare earth extraction device according to claim 6, characterized in that: The liquid level sensor is electrically connected to a probe of a corresponding liquid level meter.

8. The rare earth extraction device according to claim 6, characterized in that: The liquid level sensor comprises an upper liquid level sensor and a lower liquid level sensor, which are respectively fixed on the inner wall of the liquid level gauge casing and the part extending out of the tank body in an upper and lower order.

9. The rare earth extraction device according to claim 1 or 3, characterized in that: It also includes a first sampling tube, a first sampling valve, a second sampling tube and a second sampling valve; wherein, the first end of the first sampling tube is connected to the aqueous phase overflow box, and the second end passes through the tank body; the first sampling valve is arranged on the section of the first sampling tube located outside the tank body; the first end of the second sampling tube is connected to the organic phase overflow box, and the second end passes through the tank body; the second sampling valve is arranged on the section of the second sampling tube located outside the tank body.

10. The rare earth extraction device according to claim 9, characterized in that: The first sampling tube is arranged below the half line of the box body of the water phase overflow box; the second sampling tube is arranged above the half line of the box body of the organic phase overflow box.

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