Rare earth roasted ore multi-stage leaching device

Abstract

The invention belongs to the field of rare earth smelting separation, and particularly relates to a rare earth roasted ore multi-stage leaching device. The invention discloses a rare earth roasted ore multistage leaching device which can prevent the inner wall of a leaching tank from forming bonding and deposition phenomena and improve the material leaching rate. The rare earth roasted ore multistage leaching device comprises a placement bottom plate and the like, the placement bottom plate is step-shaped; the leaching tank is placed on the step of the placing bottom plate; the stirring structure is arranged in the leaching tank and is used for stirring in a rotating manner; each communication structure is arranged between every two adjacent leaching tanks, and the middle of each communication structure is obliquely arranged. By changing the rotating speed of the stirring motor, the positions of the stirring rod and the hinge rod can be changed, so that the existence of stirring dead angles in the tank body is prevented, and as the hinge rod is also rotationally arranged on the outer side surface of the lower guide rod, in the stirring process, the edge position of the bottom in the tank body can be stirred, and the stirring effect is improved. And raw materials are prevented from remaining at the edge position.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rare earth smelting and separation, and particularly relates to a multistage leaching device for rare earth calcined ore. BACKGROUND

[0002] As an important strategic resource of the country, rare earth plays an irreplaceable role in the fields of new energy, high-end manufacturing, aerospace, etc. The leaching of rare earth calcined ore is a key link in the process of rare earth smelting, and its leaching efficiency and stability directly affect the cost and quality of subsequent rare earth separation and purification.

[0003] Currently, the leaching device widely used in the leaching process of rare earth calcined ore is mainly a cylindrical leaching tank with fixed volume. However, in the actual production process, such devices gradually expose the technical limitations of being difficult to flexibly adapt to rare earth calcined ores with different characteristics. The particle size distribution and composition of rare earth calcined ore vary significantly due to differences in ore sources and roasting process parameters. For example, some calcined ores have a high content of clay and are in a fine particle size state, which is prone to form adhesion and deposition on the inner wall of the cylindrical leaching tank during the leaching process. As the running time of the device increases, the adhesion accumulates, resulting in a continuous decrease in the effective reaction volume of the leaching tank, which seriously affects the production efficiency.

[0004] At the same time, the stirring system of the existing leaching device generally uses general-purpose stirring blades, which lack special optimization for calcined ores with different physical properties. For high-hardness or high-density calcined ore particles, the traditional stirring blades are difficult to form a uniform and effective stirring flow field, and are prone to have stirring dead zones in the tank body. This causes the materials in some areas to not be fully contacted with the leaching agent, resulting in insufficient mixing of the materials and uneven reaction, which directly leads to large fluctuations in the leaching rate.

[0005] Therefore, it is of great significance to develop a multistage leaching device for rare earth calcined ore that can prevent the formation of adhesion and deposition on the inner wall of the leaching tank and improve the leaching rate of the materials, to promote the technological upgrading of the rare earth smelting industry. SUMMARY

[0006] In order to overcome the shortcomings of the prior art, the present application provides a multistage leaching device for rare earth calcined ore that can prevent the formation of adhesion and deposition on the inner wall of the leaching tank and improve the leaching rate of the materials.

[0007] Technical scheme: A multistage leaching device for rare earth calcined ore, comprising a placement base, a leaching tank, a stirring structure, and a communication structure. The placement base is in a stepped shape. The leaching tank is placed on the steps of the placement base. The stirring structure is arranged in the leaching tank and stirs by rotating. The communication structure is arranged between two adjacent leaching tanks, and the middle part of the communication structure is inclined.

[0008] In one of the embodiments, the leaching tank comprises a tank body, a waste gas outlet pipe, a pressure gauge, a feeding pipe, an insulation layer, an insulation inlet, an insulation outlet and a temperature gauge, the tank body is placed on the step of the placing bottom plate; the waste gas outlet pipe and the pressure gauge are arranged on the top of the tank body; the feeding pipe is arranged above the tank body; the insulation layer is circumferentially sleeved on the outside of the tank body, the insulation inlet is arranged on the upper part of the insulation layer, the insulation outlet is arranged on the lower part of the insulation layer, and the temperature gauge is further arranged on the upper part of the insulation layer.

[0009] In one of the embodiments, the stirring structure comprises a stirring motor, a stirring shaft, a guide rod, a stirring rod, a spring and a hinged rod, the stirring motor is arranged on the top of the tank body; the stirring shaft is rotationally arranged in the center of the tank body, the end of the stirring shaft is connected with the output shaft of the stirring motor; the guide rods are symmetrically arranged on the upper and lower parts of the stirring shaft; the stirring rod is square and is slidingly arranged between the guide rods, the stirring rods on both sides can be folded or separated, the spring is connected between the guide rods and the stirring rod; the hinged rod is rotationally arranged on the outer side surface of the stirring shaft, the stirring rod and the lower guide rod.

[0010] In one of the embodiments, the stirring structure further comprises an annular track mounted on the inner top of the tank body, and the annular track is slidingly connected with the upper guide rod.

[0011] In one of the embodiments, the communication structure comprises a connecting pipe and a filter screen, the connecting pipe is connected between two adjacent tank bodies, the middle part of the connecting pipe is obliquely arranged, and the filter screen is arranged at the feeding inlet of the connecting pipe.

[0012] In one of the embodiments, the gas injection structure is further arranged on the top of the tank body, the gas injection structure comprises a sealing sleeve, an air inlet ring and an air inlet pipe, the sealing sleeve is arranged at the central position of the top of the tank body, and the stirring shaft vertically penetrates through the sealing sleeve; the air inlet ring is arranged on the stirring shaft and is wrapped by the sealing sleeve, a ring of air inlets is formed on the air inlet ring; the air inlet pipe is arranged on the sealing sleeve and is fixedly connected with the top of the tank body; an air inlet channel is vertically formed in the stirring shaft, and air injection channels are formed on the stirring shaft on both sides of the air inlet channel.

[0013] In one of the embodiments, the bottom inside of the lowermost air injection channel is flush with the bottom of the air inlet channel, and the air injection channel is obliquely arranged downwardly and outwardly.

[0014] In one of the embodiments, a sealing layer is further arranged between the sealing sleeve and the air inlet ring below the air inlet, the sealing layer is rotationally connected with the air inlet ring, and the upper surface of the sealing layer is flush with the bottom of the air inlet.

[0015] In one of the embodiments, a medicine adding structure is further arranged, the medicine adding structure is a conical funnel, and the bottom end of the medicine adding structure is in communication with the air inlet pipe.

[0016] Compared with the prior art, the present application has the following advantages: by changing the rotating speed of the stirring motor, the positions of the stirring rod and the articulated rod are changed, so as to prevent the existence of stirring dead angle in the tank, and because the outer side surface of the lower guide rod is also provided with the articulated rod, the edge position of the bottom in the tank can also be stirred during the stirring process, so as to prevent the raw materials from being left in the edge position; the gas is added into the leaching tank through the gas adding channel, because the stirring shaft rotates, the gas entering the leaching tank can be better dispersed, the quality of the raw material leaching is improved, and because the inner side of the bottom of the lowermost gas adding channel is flush with the bottom of the gas inlet channel, the gas adding channel is inclined downward to the outer side, when the raw materials enter the gas inlet channel, the raw materials in the gas inlet channel will also be discharged through the lowermost gas adding channel when the raw materials are discharged, so as to prevent the raw materials from being left. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the present application.

[0018] Figure 2 It is a perspective view of a single leaching device of the present application.

[0019] Figure 3 It is a perspective view of the leaching tank of the present application.

[0020] Figure 4 It is a perspective view of the heat preservation layer of the present application.

[0021] Figure 5 It is a perspective view of the stirring structure of the present application.

[0022] Figure 6 It is a front view of the stirring structure of the present application.

[0023] Figure 7 It is a sectional view of the stirring structure of the present application.

[0024] Figure 8 It is a perspective view of the present application Figure 7 It is an enlarged view of the upper part.

[0025] Figure 9 It is a perspective view of the communication structure of the present application.

[0026] Labels in the diagram: 1: Placement base plate, 2: Leaching tank, 201: Tank body, 202: Exhaust gas outlet pipe, 203: Pressure gauge, 204: Feed pipe, 205: Insulation layer, 206: Insulation inlet, 207: Insulation outlet, 208: Thermometer, 3: Stirring structure, 301: Stirring motor, 302: Stirring shaft, 303: Guide rod, 304: Stirring rod, 305: Spring, 306: Hinge rod, 307: Circular track, 4: Gas injection structure, 401: Sealing sleeve, 402: Air inlet ring, 403: Air inlet, 404: Sealing layer, 405: Air inlet pipe, 406: Air inlet channel, 407: Gas filling channel, 5: Chemical dosing structure, 6: Connecting structure, 61: Connecting pipe, 62: Filter screen. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0028] Example: A multi-stage leaching device for rare earth roasted ore, such as Figures 1-9 As shown, the system includes a base plate 1, a leaching tank 2, a stirring structure 3, and a connecting structure 6. The base plate 1 is stepped, and each step has three upwardly extending protrusions evenly spaced at the top, centered on the axis of the leaching tank 2. The leaching tank 2 is placed on the steps of the base plate 1, and each leaching tank 2 is supported by a tripod, which is limited by the protrusions on the base plate 1. The stirring structure 3 is located inside the leaching tank 2 and stirs by rotation. The connecting structure 6 is located between two adjacent leaching tanks 2, and the middle of the connecting structure 6 is inclined.

[0029] The rare earth calcine and leaching agent are accurately fed into the first leaching tank 2, which is the highest leaching tank 2, and the conveying mode can adopt a screw conveyor or a belt conveyor, the conveying capacity of which can be adjusted according to the production scale, and has a metering function, which can strictly control the amount of raw materials added each time, ensure the accuracy and consistency of the leaching reaction, and then control the stirring structure 3 to start working. In the process of fully contacting and mixing the rare earth calcine and the leaching agent, the leaching tank 2 is connected with the heat preservation structure and the aeration structure, so as to ensure the temperature in the leaching tank 2 and further strengthen the mixing and reaction effect of the materials. The rare earth elements in the rare earth calcine react with the leaching agent and gradually dissolve into the solution. As the reaction proceeds, the liquid level in the leaching tank 2 gradually rises, and then enters the next stage leaching tank 2 through the communication structure 6. The materials entering the next stage leaching tank 2 are stirred again by the stirring structure 3, further improving the leaching rate of rare earth elements. Similarly, the temperature and the amount of gas introduced are controlled according to the process requirements, and so on. The materials successively pass through each stage of leaching tank 2 and undergo multi-stage leaching reaction.

[0030] As shown in Figure 3 and Figure 4 , the leaching tank 2 comprises a tank body 201, a waste gas outlet pipe 202, a pressure gauge 203, a feeding pipe 204, a heat preservation layer 205, a heat preservation inlet 206, a heat preservation outlet 207 and a temperature gauge 208. The tank body 201 is placed on the step of the placement bottom plate 1 by a tripod and is limited by the protrusions on the placement bottom plate 1. The waste gas outlet pipe 202 and the pressure gauge 203 are arranged on the top of the tank body 201 and are used for discharging waste gas and monitoring the pressure in the tank body 201. The feeding pipe 204 is arranged above the side of the tank body 201 and is used for docking with the feeding mechanism. The heat preservation layer 205 is circumferentially sleeved outside the tank body 201. The heat preservation inlet 206 is arranged on the upper part of the heat preservation layer 205 and is connected with the outlet of the heating equipment. The heat preservation outlet 207 is arranged on the lower part of the heat preservation layer 205 and is connected with the inlet of the heating equipment. The temperature gauge 208 is further arranged on the heat preservation layer 205. The heating mode can adopt steam heating or heat conducting oil heating. Before the equipment works, the waste gas outlet pipe 202 is connected with the air purification device, the feeding pipe 204 is docked with the feeding mechanism, the heat preservation inlet 206 of the heat preservation layer 205 is connected with the outlet of the heating equipment, and the heat preservation outlet 207 is connected with the inlet of the heating equipment. After complete docking, the leaching operation is started.

[0031] As shown in Figures 5-8As shown, the stirring structure 3 comprises a stirring motor 301, a stirring shaft 302, a guide rod 303, a stirring rod 304, a spring 305 and a hinged rod 306, the stirring motor 301 is fixedly arranged on the top of the tank body 201 by bolts; the stirring shaft 302 is rotatably arranged in the center of the tank body 201, and the end of the stirring shaft 302 is connected with the output shaft of the stirring motor 301; the guide rods 303 are symmetrically arranged on the upper and lower parts of the stirring shaft 302; the stirring rods 304 are square and are slidably arranged between the guide rods 303, the stirring rods 304 on both sides can be folded or separated, and the spring 305 is connected between the guide rods 303 and the stirring rods 304; when the rotating speed of the stirring shaft 302 changes, the spring 305 deforms to different degrees, so that the distance between the stirring rods 304 is different, so that the stirring rods 304 can stir at different positions, and when the rotating speed of the stirring shaft 302 increases, the distance between the stirring rods 304 increases; the hinged rod 306 is rotatably arranged on the outer side surface of the stirring shaft 302, the stirring rod 304 and the lower guide rod 303, and the rotating direction of the hinged rod 306 is not limited; when the stirring motor 301 rotates, the stirring shaft 302 starts to rotate, and then drives the stirring rod 304 to start to rotate to stir the raw materials, so that the raw materials in the leaching tank 2 start to accelerate the reaction, and when the rotating speed of the stirring motor 301 changes, the positions of the stirring rod 304 and the hinged rod 306 change, so as to prevent the existence of stirring dead angle in the tank body 201, and because the outer side surface of the lower guide rod 303 is also rotatably provided with the hinged rod 306, the edge position of the bottom in the tank body 201 can also be stirred during the stirring process, so as to prevent the raw materials from being left in the edge position.

[0032] As shown in Figures 6-8 The stirring structure 3 further comprises an annular track 307 mounted on the inner top of the tank body 201, and the annular track 307 is slidably connected with the upper guide rod 303; because the annular track 307 is slidably connected with the upper guide rod 303, the guide rod 303 can rotate more stably during the rotation of the guide rod 303, and the service life of the stirring structure 3 is improved.

[0033] As shown in Figure 9 The communication structure 6 comprises a connecting pipe 61 and a filter screen 62, the connecting pipe 61 is connected between two adjacent tank bodies 201 and is used for conveying leached materials, the middle part of the connecting pipe 61 is obliquely arranged to accelerate the speed of material outflow, and the filter screen 62 is arranged at the inlet of the connecting pipe 61 to filter relatively large raw materials.

[0034] As shown in Figure 7 and Figure 8As shown, the device further comprises an air injection structure 4, the top of the tank body 201 is provided with the air injection structure 4, the air injection structure 4 comprises a sealing sleeve 401, an air inlet ring 402, a sealing layer 404 and an air inlet pipe 405, the sealing sleeve 401 is arranged at the center position of the top of the tank body 201, the top and bottom of the sealing sleeve 401 are in contact with the equipment, and the contact position is sealed by a sealing ring, and the stirring shaft 302 vertically penetrates the sealing sleeve 401; the air inlet ring 402 is arranged on the stirring shaft 302, the air inlet ring 402 is wrapped by the sealing sleeve 401, and a circle of air inlets 403 is formed on the air inlet ring 402; the air inlet pipe 405 is arranged on the sealing sleeve 401 and fixedly connected with the top of the tank body 201, and the air inlet pipe 405 is connected with the air injection mechanism; the air inlet channel 406 is vertically formed in the stirring shaft 302, and the air inlet channel 406 is arranged on the stirring shaft 302; the bottom inside of the lowermost air inlet channel 407 is flush with the bottom of the air inlet channel 406, and the air inlet channel 407 is inclined outward and downward; the sealing layer 404 is arranged between the sealing sleeve 401 and the air inlet ring 402 below the air inlet 403, the sealing layer 404 is rotationally connected with the air inlet ring 402, the upper surface of the sealing layer 404 is flush with the bottom of the air inlet 403, and the sealing layer 404 is used to close the air inlet space in the sealing sleeve 401.

[0035] The air injection mechanism is connected with the air inlet pipe 405, the gas enters the air inlet ring 402 through the air inlet pipe 405, then enters the air inlet channel 406 through the air inlet 403 on the air inlet ring 402, and then enters the leaching tank 2 through the air inlet channel 407, because the stirring shaft 302 rotates, the gas entering the leaching tank 2 can be better dispersed, the quality of the raw material leaching is improved, and because the bottom inside of the lowermost air inlet channel 407 is flush with the bottom of the air inlet channel 406 and the air inlet channel 407 is inclined outward and downward, when the raw material is discharged, the raw material in the air inlet channel 406 can also be discharged through the lowermost air inlet channel 407, so as to prevent the raw material from being left.

[0036] As shown in Figure 7 and Figure 8 The device further comprises a medicine adding structure 5, the medicine adding structure 5 is a conical funnel, and the bottom end of the medicine adding structure 5 is in communication with the air inlet pipe 405; the leaching agent is added through the funnel and then enters the leaching tank 2 along with the gas, which facilitates the subsequent addition of the leaching agent, and the leaching agent rotating along with the stirring shaft 302 can better react with the raw material.

Claims

1. A multi-stage leaching device for rare earth roasted ore, comprising: Place the base plate (1), which is stepped; Leaching tank (2), the leaching tank (2) includes a tank body (201), the tank body (201) is placed on the step of the placement base plate (1); The stirring structure (3) is installed inside the leaching tank (2) and is stirred by rotation; A connecting structure (6) is disposed between two adjacent leaching tanks (2), with the middle part of the connecting structure (6) being inclined. Its characteristic is that the stirring structure (3) includes: A stirring motor (301) is installed on top of the tank body (201); A stirring shaft (302) is rotatably mounted at the center of the tank (201), and the end of the stirring shaft (302) is connected to the output shaft of the stirring motor (301); Guide rods (303) are symmetrically arranged on the upper and lower parts of the stirring shaft (302); The stirring rod (304) is square and is slidably disposed between the upper and lower guide rods (303). The stirring rods (304) on both sides can be closed or separated. A spring (305) is connected between the guide rods (303) and the stirring rods (304). The hinge rod (306) is rotatably disposed on the outer side of the stirring shaft (302), the stirring rod (304) and the lower guide rod (303).

2. The multi-stage leaching device for rare earth roasted ore as described in claim 1, characterized in that: The leaching tank (2) also includes: The exhaust gas outlet pipe (202) is located at the top of the tank (201); A pressure gauge (203) is installed on the top of the tank (201); A feed pipe (204) is disposed above the tank body (201); The insulation layer (205) is sleeved on the outer circumference of the tank body (201). The insulation layer (205) has an insulation inlet (206) at the top and an insulation outlet (207) at the bottom. The insulation layer (205) is also equipped with a thermometer (208).

3. The multi-stage leaching device for rare earth roasted ore as described in claim 2, characterized in that: The stirring structure (3) also includes: An annular track (307) is installed at the top inside the tank (201), and the annular track (307) is slidably connected to the upper guide rod (303).

4. The multi-stage leaching device for rare earth roasted ore as described in claim 1, characterized in that: The connectivity structure (6) includes: A connecting pipe (61) is connected between two adjacent tanks (201). The middle part of the connecting pipe (61) is inclined, and a filter screen (62) is provided at the feed inlet of the connecting pipe (61).

5. The multi-stage leaching device for rare earth roasted ore as described in claim 1, characterized in that: It also includes an injection structure (4), which is provided on the top of the tank (201). The injection structure (4) includes: A sealing sleeve (401) is set at the center of the top of the tank body (201), and the stirring shaft (302) passes vertically through the sealing sleeve (401). An air intake ring (402) is disposed on the stirring shaft (302). The air intake ring (402) is wrapped by the sealing sleeve (401). An air intake port (403) is provided on the air intake ring (402). An air inlet pipe (405) is installed on the sealing sleeve (401) and fixedly connected to the top of the tank body (201); an air inlet channel (406) is vertically opened inside the stirring shaft (302), and an air filling channel (407) is opened on both sides of the stirring shaft (302) of the air inlet channel (406).

6. The multi-stage leaching device for rare earth roasted ore as described in claim 5, characterized in that: The bottom inner side of the lowest gas filling channel (407) is flush with the bottom of the air intake channel (406), and the gas filling channel (407) is inclined to the outside and downward.

7. The multi-stage leaching device for rare earth roasted ore as described in claim 5, characterized in that: Also includes: A sealing layer (404) is disposed between a sealing sleeve (401) and an air intake ring (402) below an air intake (403). The sealing layer (404) is rotatably connected to the air intake ring (402), and the upper surface of the sealing layer (404) is flush with the bottom of the air intake (403).

8. A multi-stage leaching device for rare earth roasted ore as described in claim 5, characterized in that: Also includes: The dosing structure (5) is a cone-shaped funnel, and the bottom end of the dosing structure (5) is connected to the air inlet pipe (405).

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