Continuous carbon deposition reaction equipment

Abstract

The utility model discloses continuous carbon deposition reaction equipment, relates to the technical field of rare earth separation, and solves the technical problems of low production efficiency and poorer product quality of the existing device. The feeding device comprises a first tank, second tanks and a third tank, at least one second tank is arranged between the first tank and the third tank, a material passing pipe is communicated between every two adjacent tanks, and every two adjacent material passing pipes are arranged in an up-down staggered mode. Two other material passing pipes adjacent to one material passing pipe are located above or below the material passing pipe, the material passing pipe connected to the first tank is located at the lower end of the first tank, and stirring devices are arranged in the first tank, the second tank and the third tank. The device has the advantages of high production efficiency, high product quality, uniformity and the like.

Description

Technical Field

[0001] This utility model belongs to the field of rare earth separation technology, specifically relating to a continuous carbon precipitation reaction device. Background Technology

[0002] Rare earth elements are a group of elements with unique chemical and physical properties. They play a vital role in many high-tech and green energy applications. Rare earth elements include 17 elements, including the lanthanides (15 elements from lanthanum to ruthenium), scandium, and yttrium. These elements usually exist in nature in the form of oxides and have excellent magnetic, optical, and electrical properties due to their unique 4f electron shell structure. Rare earth elements have wide applications in electronics, communications, aerospace, new energy, and new materials.

[0003] Rare earth carbon precipitation is an effective process for preparing rare earth metals. It utilizes the reducing properties of carbon to reduce rare earth oxides or chlorides into metallic rare earths. Carbon precipitation reduces the number of steps in the production of rare earth oxides, thus lowering production costs. Traditional carbon precipitation processes typically employ a single-tank, single-paddle process, involving reaction, clarification, washing, and further clarification. Several tanks are used for intermittent single-tank, single-paddle reactions. The subsequent washing process requires 3-5 washes to thoroughly clean the slurry, consuming up to 30 ml of water per ton of product. 3 However, due to the use of a single tank for intermittent carbon deposition reaction, the efficiency and equipment utilization rate are low, resulting in lower product quality.

[0004] Given the problems with traditional carbon precipitation reactions, it is necessary to research a carbon precipitation device with higher production efficiency and better product quality. Utility Model Content

[0005] This invention provides a continuous carbon precipitation reaction device, which aims to solve the technical problems of low production efficiency and poor product quality of existing devices.

[0006] To solve the aforementioned technical problems, the present invention adopts the following technical solution:

[0007] A continuous carbon deposition reaction apparatus includes a first tank, a second tank, and a third tank.

[0008] At least one second tank is provided between the first tank and the third tank. A feed pipe connects adjacent tanks, and two adjacent feed pipes are staggered vertically. Two other feed pipes adjacent to one feed pipe are located above or below that feed pipe. The feed pipe connected to the first tank is located at the lower part of the first tank.

[0009] The first tank, the second tank, and the third tank are all equipped with a stirring device.

[0010] This invention enables multi-stage continuous carbon precipitation reaction of materials by setting up multiple continuous tanks, thereby improving the yield and efficiency of precipitation. In this invention, by staggering two adjacent feed pipes to create a height difference between them, the reaction time and stirring time of the materials in the tanks are increased, allowing the materials to fully participate in the reaction, thereby improving the yield and efficiency of precipitation.

[0011] Furthermore, it should be noted that during the stirring process, rare earth carbonates with better crystal structure and larger particles, due to their higher specific gravity, are located at the bottom of the tank. They are transferred to the next tank via the lower feed pipe to serve as seed crystals, thereby inducing crystal growth in the next tank, reducing crystallization time, and controlling crystal quality. Therefore, a feed pipe is placed below the first tank to allow large crystals to enter the tank adjacent to the first tank as seed crystals, while the crystal nuclei above the first tank have sufficient time to grow larger. The feed pipe between the second and third tanks is located at the top of the tanks because, after the large crystals from the first tank enter the first and second tanks, the amount of material and precipitant added to the second tank increases as the amount of liquid entering from the first tank increases. The liquid level in the second tank gradually rises until it reaches the height of the upper feed pipe. Since the newly generated crystal nuclei are in a metastable state and are unstable precipitates, they are in the crystal formation stage with poor crystal form and small particles. As the liquid level rises, these metastable crystal grains will grow into large crystals and enter the next tank as seed crystals, while the large crystals at the bottom precipitate. The reason why the feed pipes of subsequent tanks are set at the bottom or top is the same as the reason for the feed pipe setting mentioned above. The relatively staggered connection method of the feed pipes can ensure that the material entering the next stage is rare earth carbonate with a complete crystal form, which can be used as the reaction seed crystal in the next tank. This ensures that the precipitate particles in each tank are evenly distributed in size and have a complete and stable crystal form.

[0012] Furthermore, it should be noted that in the rare earth carbon precipitation reaction, ammonium bicarbonate and other precipitants are usually used to react with rare earth ions to generate rare earth carbonate precipitate crystals.

[0013] Preferably, a fourth tank is connected to the third tank, and the third tank and the fourth tank are connected by a discharge pipe. The discharge pipe is connected to the upper part of the third tank, and the upper end of the fourth tank is provided with an overflow port to stabilize the liquid levels of the first tank, the second tank and the third tank.

[0014] After adopting this technical solution, it should be noted that the fourth tank serves to balance the liquid levels of the first, second, and third tanks. Specifically, based on the principle of communicating vessels, when the material in each tank is not flowing or is flowing slowly, the liquid levels in each container will remain equal. An overflow port is set at the top of the fourth tank. When the liquid level in any of the tanks in the system rises, the liquid level in the fourth tank will also rise accordingly. When the liquid level rises to the overflow port, the excess liquid will flow out through the overflow port, thereby preventing the liquid level from rising further. Therefore, the setting of the fourth tank limits the maximum height of the liquid level, which helps to maintain the relative stability of the liquid level in the entire system and improves the quality and consistency of the product.

[0015] Preferably, the fourth tank is provided with a clarification hopper, the clarification hopper has a through hole in the center, the clarification hopper divides the fourth tank into upper and lower parts, the upper part is a clarification chamber and the lower part is a thickening chamber, the discharge pipe is connected to the thickening chamber, and the overflow port is located at the upper end of the clarification chamber.

[0016] After adopting this technical solution, it should be noted that the material in the third tank enters the thickening chamber through the discharge pipe. As the liquid level in the thickening chamber rises, the material enters the clarification chamber after being filtered through the clarification hopper. When the liquid level continues to rise, it is discharged through the overflow port. It should also be noted that the clarification hopper filtration is existing technology and will not be described in detail here.

[0017] Furthermore, the stirring device includes stirring blades, which are provided in three layers. The three layers of stirring blades are located sequentially in the lower, middle and upper parts of the tank, and the stirring blades are arranged in a counter-rotating manner.

[0018] After adopting this technical solution, it should be noted that the reverse blades refer to the blades rotating in a direction that pushes the material in the opposite direction to its rotation, thereby forming a reverse fluid circulation inside the tank. This reverse circulation helps to mix the rare earth slurry and precipitant more evenly and improves the efficiency of the carbon precipitation reaction. The three-layer blades further improve the mixing efficiency and also prevent uneven mixing when there is a large amount of rare earth slurry and precipitant in the tank. The three layers of blades are located at the bottom, middle and top of the tank, respectively, to stir the slurry at different heights in the tank, thereby improving the mixing efficiency and uniformity.

[0019] Preferably, there are two second tanks, and the feed pipe between the two second tanks is located above the feed pipes that connect the two second tanks to the first tank and the third tank, respectively.

[0020] After adopting this technical solution, it should be noted that, in order to balance product quality and reduce equipment footprint, two second tanks are set up. When the two second tanks are used in conjunction with the first and third tanks, the product meets the requirements of continuous carbon precipitation reaction. In addition, it should be noted that the feed pipes connecting adjacent tanks are arranged in a staggered manner, forming an "S"-shaped connection between adjacent tanks. This allows larger crystals from the previous tank to enter the next tank through the feed pipe as reaction seed crystals in the next tank. This ensures that the precipitate particles in each tank are uniformly distributed in size and have intact and stable crystal forms. The specific principle has been analyzed and will not be repeated here.

[0021] Furthermore, the stirring device includes a drive motor, and the drive motor is installed on the top of the first tank, the second tank, and the third tank. The output end of the drive motor is connected to a drive rod, which extends into the interior of the first tank, the second tank, and the third tank. The stirring blade is installed on the drive rod.

[0022] After adopting this technical solution, it should be noted that the drive motor drives the drive rod to rotate, thereby driving the stirring blade to rotate, so as to achieve the stirring effect of rare earth slurry.

[0023] Preferably, the speed of the stirring blades corresponding to the first tank to the third tank decreases sequentially.

[0024] After adopting this technical solution, it should be noted that this utility model uses an existing frequency converter to control the speed of the drive motor, and adjusts the stirring intensity of the stirring device in the first tank, the second tank and the third tank by adjusting the speed of the drive motor.

[0025] Furthermore, it should be noted that the stirring intensity affects the formation and properties of crystals. Therefore, the stirring intensity of the stirring device is the highest in the first tank, which allows rare earth ions and precipitants to mix rapidly and promote the formation of small crystal nuclei. When the rare earth slurry and precipitant in the first tank overflow into the subsequent tanks, as the reaction continues, more rare earth ions and precipitants are adsorbed onto the crystal nuclei, causing the crystals to gradually grow. In the subsequent tanks, the stirring intensity is gradually reduced to decrease the agglomeration and breakage between crystals, thereby maintaining the uniformity and integrity of the crystals and improving the quality of the product. Finally, it should be noted that in this invention, the total amount of material and precipitant in each tank decreases sequentially, so the stirring intensity of the corresponding tank is also adjusted accordingly to ensure that the final rare earth carbonate crystals have high uniformity and integrity, thus improving the quality of the product.

[0026] Preferably, the fourth tank is also equipped with a stirring device, and the stirring device has a layer of stirring blades, which are located in the thickening chamber.

[0027] Furthermore, the first tank has a first feed pipe on its side wall, the first tank and the second tank both have a second feed pipe on their tops, and the third tank also has a third feed pipe on its top.

[0028] In this invention, the first and third feed pipes are used to add precipitant and hot water, the second feed pipe is used to add rare earth slurry, and the discharge pipe is used to discharge the clear liquid above the sediment in the third tank.

[0029] Preferably, the discharge pipe is located above the feed pipe to increase the reaction time, allowing sufficient time for the newly formed crystal nuclei above the reaction system in the third tank to grow, resulting in higher uniformity and integrity of the final rare earth carbonate crystals and improved product quality.

[0030] Preferably, the bottoms of the first tank, the second tank, and the third tank are designed to be inverted cone-shaped, so that when sediment is generated, the sediment will accumulate in the inverted cone-shaped part, making it easier to discharge later.

[0031] Preferably, the bottom of the first tank, the second tank and the third tank are all provided with discharge pipes. In this utility model, each discharge pipe is provided with a solenoid valve to control the opening of the discharge pipe and reduce the intensity of manual labor.

[0032] Preferably, the fourth tank is provided with a slurry outlet at the bottom.

[0033] Preferably, the drive motor is detachably connected to the first tank, the second tank, and the third tank to facilitate maintenance and replacement.

[0034] Preferably, the first tank, the second tank, and the third tank are all equipped with exhaust pipes for discharging the waste gas generated by the carbon deposition reaction.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0036] 1. The present invention provides a continuous carbon precipitation reaction device, which can realize multi-stage continuous carbon precipitation reaction of materials by setting up multiple continuous tanks, thereby improving the precipitation yield and efficiency.

[0037] 2. The continuous carbon precipitation reaction equipment provided by this utility model, by staggering two adjacent feed pipes to form a height difference between the two feed pipes, allows the larger crystals of the previous tank to enter the next tank through the feed pipe as reaction seed crystals in the next tank, ensuring that the precipitate particles in each tank are uniformly distributed in size and have intact and stable crystal forms.

[0038] 3. The continuous carbon precipitation reaction equipment provided by this utility model maintains the stability of the liquid level in each tank of the entire system by setting a fourth tank, thereby improving the quality and consistency of the product.

[0039] 4. The continuous carbon precipitation reaction equipment provided by this utility model reduces the agglomeration and breakage between crystals by gradually reducing the stirring intensity from the first tank to the third tank, thereby maintaining the uniformity and integrity of the crystals and improving the quality of the product.

[0040] 5. The continuous carbon precipitation reaction equipment provided by this utility model, by setting up a reverse blade, forms a reverse fluid circulation inside the tank. This reverse circulation helps to mix the rare earth slurry and precipitant more evenly, thereby improving the efficiency of the carbon precipitation reaction.

[0041] 6. The present invention provides a continuous carbon precipitation reaction device, wherein the bottoms of the first tank, the second tank and the third tank are set in an inverted cone shape. When precipitation occurs, the precipitate will accumulate in the inverted cone shape, which is convenient for subsequent discharge. Attached Figure Description

[0042] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0043] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0044] Figure 2 This is a cross-sectional view of the first tank of this utility model.

[0045] Figure label:

[0046] 1-Drive motor; 2-Drive rod; 3-Stirring blade; 4-Feed pipe; 5-Discharge pipe; 6-First feed pipe; 7-First tank; 8-Second feed pipe; 9-Second tank; 10-Third tank; 11-Discharge pipe; 12-Third feed pipe; 13-Exhaust pipe; 14-Fourth tank; 15-Overflow port; 16-Clarifying hopper. Detailed Implementation

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and indicated in the accompanying drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0048] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] The following combination Figure 1-Figure 2 This utility model will be described in detail.

[0050] Example 1

[0051] A continuous carbon precipitation reaction device, such as Figure 1 , Figure 2 As shown, it includes a first tank 7, a second tank 9, and a third tank 10.

[0052] At least one second tank 9 is provided between the first tank 7 and the third tank 10. A feed pipe 4 connects adjacent tanks. The two adjacent feed pipes 4 are staggered vertically. Two other feed pipes 4 adjacent to one feed pipe 4 are located above or below that feed pipe 4. The feed pipe 4 connected to the first tank 7 is located at the lower end of the first tank 7.

[0053] The first tank 7, the second tank 9, and the third tank 10 are all equipped with stirring devices.

[0054] The stirring device includes stirring blades 3, which are arranged in three layers. The three layers of stirring blades 3 are located at the bottom, middle and top of the tank in sequence, and the stirring blades 3 are arranged in reverse.

[0055] The stirring device includes a drive motor 1. The drive motor 1 is installed on the top of the first tank 7, the second tank 9, and the third tank 10. The output end of the drive motor 1 is connected to a drive rod 2. The drive rod 2 extends into the interior of the first tank 7, the second tank 9, and the third tank 10. The stirring blade 3 is installed on the drive rod 2.

[0056] The rotational speed of the stirring blades 3 corresponding to the first tank 7 to the third tank 10 decreases sequentially.

[0057] The first tank 7 has a first feed pipe 6 on its side wall, and the top of the first tank 7 and the second tank 9 are both provided with a second feed pipe 8. The top of the third tank 10 is also provided with a third feed pipe 12.

[0058] The discharge pipe 11 is located above the feed pipe 4 to increase the reaction time and ensure that the rare earth slurry is completely mixed with the precipitant.

[0059] The bottom of the first tank 7, the second tank 9 and the third tank 10 are all provided with discharge pipes 5. In this embodiment, each discharge pipe 5 is provided with a solenoid valve to control the opening of the discharge pipe 5 and reduce the intensity of manual labor.

[0060] The fourth tank is equipped with a slurry outlet at its bottom.

[0061] The drive motor 1 is detachably connected to the first tank 7, the second tank 9, and the third tank 10.

[0062] The first tank 7, the second tank 9 and the third tank 10 are all equipped with exhaust pipes 13 for discharging the waste gas generated by the carbon deposition reaction.

[0063] The fourth tank 14 is also equipped with a stirring device, and the stirring blades 3 corresponding to the stirring device are arranged in a layer, and the stirring blades 3 are arranged in the thickening chamber.

[0064] In this embodiment, by setting up multiple consecutive tanks, a multi-stage continuous carbon precipitation reaction of the material is achieved, thereby improving the precipitation yield and efficiency. By staggering the two adjacent feed pipes 4 and placing the feed pipe 4 between the first tank 7 and the first second tank 9 at the bottom, large crystals in the first tank can enter the first second tank 9 through the feed pipe 4 as reaction seed crystals in the first second tank 9. The next feed pipe 4 is placed at the top of the tank, so that the metastable crystal nuclei in the reaction system above the tank have enough time to grow into large crystals and enter the next tank as seed crystals. This ensures that the precipitate particles in each tank are uniformly distributed in size and have a complete and stable crystal form.

[0065] In this embodiment, the speed of the drive motor is controlled by the frequency converter, so that the stirring intensity of the stirring device corresponding to the first tank to the third tank decreases in sequence, thereby reducing the agglomeration and breakage between crystals, thus maintaining the uniformity and integrity of the crystals and improving the quality of the product. The stirring intensity can also be controlled according to the amount of slurry in the corresponding tank.

[0066] Example 2

[0067] The difference between this embodiment and Embodiment 1 is that, as Figure 1 As shown, the third tank 10 is connected to the fourth tank 14. The three tanks and the fourth tank 14 are connected by a discharge pipe 11. The discharge pipe 11 is connected to the upper part of the third tank 10. The upper end of the fourth tank 14 is provided with an overflow port 15, which stabilizes the liquid levels of the first tank 7, the second tank 9 and the third tank 10.

[0068] The fourth tank 14 is equipped with a clarification hopper. The clarification hopper 16 has a through hole in the center. The clarification hopper 16 divides the fourth tank 14 into upper and lower parts. The upper part is a clarification chamber and the lower part is a thickening chamber. The discharge pipe 11 is connected to the thickening chamber. The overflow port 15 is located at the upper end of the clarification chamber.

[0069] In this embodiment, the fourth tank 14 serves to balance the liquid levels of the first tank 7, the second tank 9, and the third tank 10. Specifically, based on the principle of communicating vessels, when the material in each tank is not flowing or is flowing slowly, the liquid levels in each container will remain level. An overflow port 15 is provided at the upper end of the fourth tank 14. When the liquid level in any of the tanks in the system rises, the liquid level in the fourth tank 14 will also rise accordingly. When the liquid level rises to the overflow port 15, the excess liquid will flow out through the overflow port 15, thereby preventing the liquid level from rising further. Therefore, the fourth tank 14 limits the maximum height of the liquid level, which helps to maintain the relative stability of the liquid level in the entire system and improves the quality and consistency of the product. In addition, the material in the third tank 10 enters the thickening chamber through the discharge pipe 11. As the liquid level in the thickening chamber rises, the material is filtered through the clarification hopper 16 and then enters the clarification chamber. When the liquid level continues to rise, it is discharged through the overflow port 15.

[0070] Example 3

[0071] The difference between this embodiment and Embodiment 2 is that, as Figure 1 As shown, there are two second tanks 9, and the feed pipe 4 between the two second tanks 9 is located above the feed pipe 4 that connects the two second tanks 9 to the first tank 7 and the third tank 10, respectively.

[0072] In this embodiment, to balance product quality and reduce equipment footprint, two second tanks 9 are provided. When the two second tanks 9 are combined with the first tank 7 and the third tank 10, the product meets the requirements of continuous carbon precipitation reaction. In addition, it should be noted that the feed pipes 4 connecting adjacent tanks are arranged in a staggered manner, forming an "S"-shaped connection between adjacent tanks. This allows larger crystals from the previous tank to enter the next tank as reaction seed crystals, ensuring that the precipitate particles in each tank are uniformly distributed in size and have intact and stable crystal forms. The specific principle has been analyzed and will not be repeated here.

[0073] Example 4

[0074] The difference between this embodiment and embodiment 3 is that, as Figure 1 , Figure 2 As shown, the bottoms of the first tank 7, the second tank 9, and the third tank 10 are designed to be inverted cone-shaped. When sediment is generated, it will accumulate in the inverted cone-shaped part, which will facilitate subsequent discharge.

[0075] Example 5

[0076] The difference between this embodiment and embodiment 4 is that the material passage pipe 4 at the bottom of the tank is located at one-fifth to one-third of the overall height of the tank, while the material passage pipe 4 at the top of the tank is located at one-half to two-thirds of the overall height of the tank.

[0077] The working process of this utility model:

[0078] Before operating the equipment: First, open the solenoid valves in the feed pipe 4 and discharge pipe 11 between the tanks, and close all the solenoid valves in the discharge pipes 5.

[0079] Carbon precipitation reaction process:

[0080] Start the drive motor 1 to drive the corresponding stirring blade 3 to rotate. At this time, rare earth slurry is continuously added from the second feed pipe 8 above the first tank 7. A mixture of hot water and precipitant is added from the first feed pipe 6. The precipitant is a mixture of ammonium bicarbonate and ammonia. After the hot water and precipitant are added, the solenoid valve of the first feed pipe 6 is immediately closed. If it is necessary to add more, the above operation is repeated to prevent the rare earth slurry from overflowing. Under the combined action of hot water and precipitant, the rare earth slurry undergoes a carbon precipitation reaction and is highly mixed under the counter-rotating blade setting of the stirring blade 3, so that the reactants are in full contact with each other. When the liquid level reaches the height of the feed pipe 4 between the first tank 7 and the second tank 9, some rare earth carbonate crystals are precipitated after the slurry in the first tank 7 reacts. The other part of the rare earth slurry enters the second tank 9 through the feed pipe 4 as seed crystals.

[0081] Rare earth slurry is added through the second feed pipe 8 at the top of the first second tank 9, and a mixture of hot water and precipitant is added through the third feed pipe 12 to continue the carbon precipitation reaction. In order to reduce the influence of stirring on the small crystal nuclei entering the first second tank 9 from the first tank 7, the stirring intensity of the high stirring device in the first second tank 9 is lower than that in the first tank 7. When the liquid level of the second tank 9 reaches the height of the feed pipe 4 between the first tank 7 and the first second tank 9, the liquid level of the first tank 7 and the liquid level of the first second tank 9 rise synchronously. When the liquid level of the first second tank 9 reaches the height of the feed pipe 4 between the first second tank 9 and the second second tank 9, the slurry enters the second second tank 9 through the feed pipe 4.

[0082] Rare earth slurry is added from the second feed pipe 8 at the top of the second tank 9, and a mixture of hot water and precipitant is added from the third feed pipe 12. The carbon precipitation reaction is carried out in the same way, but the stirring intensity of the stirring device in the second tank 9 is lower than that in the first tank 9. The principle is the same as the principle of the stirring device intensity setting of the first tank 7 and the first tank 9. When the liquid level in the second tank 9 reaches the height of the feed pipe 4 between the second tank 9 and the third tank 10, the slurry enters the third tank 10 through the feed pipe 4.

[0083] A mixture of hot water and precipitant is added from the third feed pipe 12 at the top of the third tank 10 to continue the carbon precipitation reaction. However, the stirring intensity of the third tank 10 is lower than that of the second tank 9. The principle is the same as above and will not be repeated. The stirring intensity of the third tank 10 is relatively small, so that the slurry gradually stabilizes and settles to achieve a solid-liquid separation state, and a uniform and high-quality rare earth carbonate precipitate is obtained. When the liquid level of the third tank 10 reaches the height of the feed pipe 4 between the second tank 9 and the third tank 10, the liquid level of the second tank 9 and the liquid level of the third tank 10 rise synchronously. When the liquid level of the third tank 10 reaches the height of the discharge pipe 11, the upper clear liquid flows out of the tank through the discharge pipe 11.

[0084] The purpose of adding rare earth slurry to the second tank 9 is to allow the rare earth slurry to be added in stages, reduce the workload of the first tank 7, and improve the reaction efficiency. The inconsistent height of the feed pipe 4 ensures that the slurry is fully reacted before entering the next tank, thus guaranteeing the reaction efficiency. The stirring intensity in each tank is gradually reduced to stabilize the slurry. The reacted slurry is then passed into the subsequent clarification device to obtain rare earth carbonate.

[0085] Discharge of rare earth carbonate precipitates: After the equipment has been working for a period of time, in order to prevent the precipitate from accumulating too much and affecting the working efficiency of the equipment, open the solenoid valve in the discharge pipe 5 to release the precipitate. At this time, the equipment is still in working condition. After the precipitate is collected, close the discharge pipe 5.

[0086] Subsequent maintenance: To maintain the working efficiency of the equipment, it is necessary to carry out regular maintenance. Stop adding the mixture of slurry, hot water and precipitant and turn off the drive motor 1. Open the solenoid valve in the discharge pipe 5 to release the slurry. After the slurry in the tank is emptied, carry out maintenance. After the maintenance is completed, close the discharge pipe 5 and you can start working.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous carbon precipitation reaction apparatus, characterized in that: It includes the first tank (7), the second tank (9) and the third tank (10). At least one second tank (9) is provided between the first tank (7) and the third tank (10). A feed pipe (4) is connected between two adjacent tanks. The two adjacent feed pipes (4) are staggered vertically. Two other feed pipes (4) adjacent to one feed pipe (4) are located above or below that feed pipe (4). The feed pipe (4) connected to the first tank (7) is located at the lower part of the first tank (7). The first tank (7), the second tank (9) and the third tank (10) are all equipped with stirring devices.

2. The continuous carbon precipitation reaction equipment according to claim 1, characterized in that: The third tank (10) is connected to the fourth tank (14). The third tank (10) and the fourth tank (14) are connected by a discharge pipe (11). The discharge pipe (11) is connected to the upper part of the third tank (10). The fourth tank (14) is provided with an overflow port (15) at the upper end.

3. The continuous carbon precipitation reaction equipment according to claim 2, characterized in that: The fourth tank (14) is provided with a clarification hopper (16), and the clarification hopper (16) has a through hole in the center. The clarification hopper (16) divides the fourth tank (14) into upper and lower parts. The upper part is the clarification chamber and the lower part is the thickening chamber. The discharge pipe (11) is connected to the thickening chamber, and the overflow port (15) is located at the upper end of the clarification chamber.

4. A continuous carbon precipitation reaction apparatus according to any one of claims 1-3, characterized in that: The stirring device includes stirring blades (3), which are provided in three layers. The three layers of stirring blades (3) are located in the lower, middle and upper parts of the tank in sequence. The stirring blades (3) are arranged in reverse.

5. A continuous carbon precipitation reaction apparatus according to any one of claims 1-3, characterized in that: The second tank (9) is configured as two, and the feed pipe (4) between the two second tanks (9) is located above the feed pipe (4) that connects the two second tanks (9) to the first tank (7) and the third tank (10) respectively.

6. A continuous carbon precipitation reaction apparatus according to claim 4, characterized in that: The rotation speed of the stirring blades (3) corresponding to the first tank (7) to the third tank (10) decreases sequentially.

7. A continuous carbon precipitation reaction apparatus according to any one of claims 1-3, characterized in that: The first tank (7) has a first feed pipe (6) on its side wall, and the top of the first tank (7) and the second tank (9) are provided with a second feed pipe (8). The top of the third tank (10) is also provided with a third feed pipe (12).

8. A continuous carbon precipitation reaction apparatus according to claim 2, characterized in that: The discharge pipe (11) is located above the feed pipe (4).

9. A continuous carbon precipitation reaction apparatus according to any one of claims 1-3, characterized in that: The bottoms of the first tank (7), the second tank (9) and the third tank (10) are set in an inverted cone shape.

10. A continuous carbon precipitation reaction apparatus according to any one of claims 1-3, characterized in that: The bottom of the first tank (7), the second tank (9) and the third tank (10) are all provided with discharge pipes (5).

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