Self-suction type heating rare earth ore slurry decomposition device

Abstract

The utility model discloses a self -priming formula heating rare earth ore pulp hydrolysis decomposition device, including multistage series steel lining polytetrafluoroethylene reation kettle, multistage series steel lining polytetrafluoroethylene reation kettle includes the first stage steel lining polytetrafluoroethylene reation kettle, second stage steel lining polytetrafluoroethylene reation kettle and third stage steel lining polytetrafluoroethylene reation kettle that are connected in turn, first stage steel lining polytetrafluoroethylene reation kettle, second stage steel lining polytetrafluoroethylene reation kettle and third stage steel lining polytetrafluoroethylene reation kettle are installed slurry circulating heating subassembly respectively, first stage steel lining polytetrafluoroethylene reation kettle, second stage steel lining polytetrafluoroethylene reation kettle and third stage steel lining polytetrafluoroethylene reation kettle are installed double -deck stirring oar subassembly respectively. The utility model can realize that slurry is heated and continuously in -and -out material outside the reation kettle body, can realize the continuous overflow flow of slurry.

Description

Technical Field

[0001] This utility model relates to the field of rare earth mineral hydrometallurgical technology, and in particular to a self-heating rare earth ore slurry decomposition device. Background Technology

[0002] Currently, the main industrialized rare earth concentrate decomposition technologies include high-temperature roasting decomposition with concentrated sulfuric acid and atmospheric pressure decomposition with concentrated alkali solution. In the existing rare earth mineral smelting process, iron powder, magnesium oxide, and excess acid and alkali chemical raw materials, along with associated resources such as fluorine and phosphorus, form a huge amount of industrial "three wastes." In particular, radioactive waste residue poses a great challenge to regional security, not only causing strategic resource waste but also seriously affecting the rare earth recovery rate.

[0003] To achieve comprehensive utilization of valuable elements in mixed rare earth minerals, Chinese patent CN109022838A discloses a method for processing fluorine-containing rare earth mineral particles. The method involves mixing the fluorine-containing rare earth mineral particles with a sulfuric acid solution in a specific ratio, followed by heating and maintaining the temperature for a liquid-solid reaction. The exhaust gas is then condensed and absorbed by an exhaust gas treatment system to obtain a fluorosilicone mixed acid product. The concentration of the sulfuric acid solution is 40-85 wt%, and the reaction temperature is 100-180℃. This method can achieve rapid decomposition of fluorine-containing rare earth mineral particles, the reaction is easy to control, and it simultaneously enables the recycling of residual acid resources. However, problems such as material heating, continuous feeding and unloading, and equipment corrosion and wear resistance remain unsolved.

[0004] To address this, a self-heating rare earth mineral slurry decomposition device is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a self-aspirating heating rare earth mineral slurry decomposition device, which aims to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a self-priming heating rare earth mineral slurry decomposition device, including a multi-stage series steel-lined polytetrafluoroethylene reactor, wherein the multi-stage series steel-lined polytetrafluoroethylene reactor includes a first-stage steel-lined polytetrafluoroethylene reactor, a second-stage steel-lined polytetrafluoroethylene reactor and a third-stage steel-lined polytetrafluoroethylene reactor connected in series.

[0007] The primary steel-lined polytetrafluoroethylene reactor, the secondary steel-lined polytetrafluoroethylene reactor, and the tertiary steel-lined polytetrafluoroethylene reactor are each equipped with a slurry circulation heating assembly;

[0008] Double-layer agitator assemblies are installed in the primary steel-lined polytetrafluoroethylene (PTFE) reactor, the secondary steel-lined PTFE reactor, and the tertiary steel-lined PTFE reactor, respectively.

[0009] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the slurry circulation heating component includes a circulation pipe and a heat exchanger installed on the circulation pipe; the circulation pipe is fixedly connected and connected to the outer wall of the primary steel-lined polytetrafluoroethylene reactor, the outer wall of the secondary steel-lined polytetrafluoroethylene reactor, and the outer wall of the tertiary steel-lined polytetrafluoroethylene reactor.

[0010] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the double-layer stirring paddle assembly includes a driving component and a double-layer stirring paddle body, and the three driving components are respectively installed on the top wall of the first-stage steel-lined polytetrafluoroethylene reactor, the top wall of the second-stage steel-lined polytetrafluoroethylene reactor, and the top wall of the third-stage steel-lined polytetrafluoroethylene reactor.

[0011] The double-layered impeller body is mounted on the output shaft of the drive component, and the three double-layered impeller bodies extend into the first-stage steel-lined polytetrafluoroethylene reactor, the second-stage steel-lined polytetrafluoroethylene reactor, and the third-stage steel-lined polytetrafluoroethylene reactor, respectively.

[0012] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein a first feed inlet is installed at the bottom of the side wall of the first-stage steel-lined polytetrafluoroethylene reactor, and a first overflow outlet is installed at the top of the side wall.

[0013] The secondary steel-lined polytetrafluoroethylene reactor has a second feed inlet installed at the bottom of its side wall and a second overflow outlet installed at the top of its side wall.

[0014] The third feed port is installed at the bottom of the side wall of the three-stage steel-lined polytetrafluoroethylene reactor, and the third overflow port is installed at the top of the side wall.

[0015] The first overflow port is connected to the second inlet port through a first pipe, and the second overflow port is connected to the third inlet port through a second pipe.

[0016] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the top of the first-stage steel-lined polytetrafluoroethylene reactor is equipped with a first tail gas outlet, the top of the second-stage steel-lined polytetrafluoroethylene reactor is equipped with a second tail gas outlet, and the top of the third-stage steel-lined polytetrafluoroethylene reactor is equipped with a third tail gas outlet.

[0017] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the first tail gas outlet, the second tail gas outlet and the third tail gas outlet are respectively connected to tail gas treatment equipment.

[0018] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the heat exchanger is a silicon carbide heat exchanger.

[0019] According to the present invention, a self-priming heating rare earth mineral slurry decomposition device is provided, wherein the driving component is a stirring motor.

[0020] The present invention discloses the following technical effects:

[0021] This invention utilizes a series of three steel-lined polytetrafluoroethylene (PTFE) reactors connected in series to achieve continuous overflow of slurry. It can be used for the external heating continuous reaction of rare earth ore sulfuric acid slurry decomposition, and can realize the heating of slurry outside the reactor and continuous feeding and discharging.

[0022] In this invention, the slurry in the multi-stage series steel-lined polytetrafluoroethylene reactor is circulated in the slurry circulation heating component through the double-layer stirring paddle assembly. The slurry is heated by the slurry circulation heating component, which has the characteristics of efficient external heating and continuous and stable feeding and discharging.

[0023] The primary, secondary, and tertiary steel-lined PTFE reactors of this invention have good corrosion resistance and wear resistance, and can be used for the decomposition of rare earth minerals in high-temperature, mixed acid (sulfuric acid, hydrofluoric acid, phosphoric acid) systems. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] The components include: 1. A series-connected steel-lined polytetrafluoroethylene reactor; 2. A first feed inlet; 3. A first overflow outlet; 4. A first exhaust gas outlet; 5. A double-layered agitator body; 6. A slurry circulation outlet; 7. A heat exchanger; 8. A slurry circulation inlet; 9. A second feed inlet; 10. A third overflow outlet; 11. A second exhaust gas outlet; and 12. A third exhaust gas outlet. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1 This utility model provides a self-priming heating rare earth slurry decomposition device, including a multi-stage series steel-lined polytetrafluoroethylene (PTFE) reactor 1. The multi-stage series steel-lined PTFE reactor 1 includes a first-stage steel-lined PTFE reactor, a second-stage steel-lined PTFE reactor, and a third-stage steel-lined PTFE reactor connected in series. The number of series stages of the steel-lined PTFE reactors in the multi-stage series steel-lined PTFE reactor 1 is determined according to the processing capacity; the larger the processing capacity, the more series stages. In this embodiment, it is preferably three stages, namely a first-stage steel-lined PTFE reactor, a second-stage steel-lined PTFE reactor, and a third-stage steel-lined PTFE reactor.

[0030] Each of the first-stage, second-stage, and third-stage steel-lined polytetrafluoroethylene (PTFE) reactors is equipped with a slurry circulation heating assembly.

[0031] Double-layer stirring paddle assemblies are installed in the first-stage steel-lined polytetrafluoroethylene reactor, the second-stage steel-lined polytetrafluoroethylene reactor, and the third-stage steel-lined polytetrafluoroethylene reactor, respectively.

[0032] With this configuration, the present invention achieves continuous overflow flow of slurry by using a series of three steel-lined polytetrafluoroethylene (PTFE) reactors connected in series, namely a primary steel-lined PTFE reactor, a secondary steel-lined PTFE reactor, and a tertiary steel-lined PTFE reactor. This method can be used for the external heating continuous reaction of rare earth ore sulfuric acid slurry decomposition, and can realize the heating of slurry outside the reactor and continuous feeding and discharging.

[0033] In this invention, the slurry in the multi-stage series steel-lined polytetrafluoroethylene reactor 1 is circulated in the slurry circulation heating component through the double-layer stirring paddle assembly. The slurry is heated by the slurry circulation heating component, which has the characteristics of efficient external heating and continuous and stable feeding and discharging.

[0034] The primary, secondary, and tertiary steel-lined PTFE reactors of this invention have good corrosion resistance and wear resistance, and can be used for the decomposition of rare earth minerals in high-temperature, mixed acid (sulfuric acid, hydrofluoric acid, phosphoric acid) systems.

[0035] The scheme is further optimized. The slurry circulation heating component includes a circulation pipe and a heat exchanger 7 installed on the circulation pipe. Circulation pipes are fixedly connected and connected to the outer walls of the first-stage steel-lined polytetrafluoroethylene reactor, the second-stage steel-lined polytetrafluoroethylene reactor, and the third-stage steel-lined polytetrafluoroethylene reactor.

[0036] Further optimization of the scheme: the double-layer agitator assembly includes a drive component and a double-layer agitator body 5. The three drive components are respectively installed on the top wall of the first-stage steel-lined polytetrafluoroethylene reactor, the top wall of the second-stage steel-lined polytetrafluoroethylene reactor, and the top wall of the third-stage steel-lined polytetrafluoroethylene reactor.

[0037] The double-layered impeller body 5 is mounted on the output shaft of the drive component, and the three double-layered impeller bodies 5 extend into the first-stage steel-lined polytetrafluoroethylene reactor, the second-stage steel-lined polytetrafluoroethylene reactor, and the third-stage steel-lined polytetrafluoroethylene reactor, respectively.

[0038] The scheme is further optimized by installing a first feed port 2 at the bottom of the side wall of the first-stage steel-lined polytetrafluoroethylene reactor and a first overflow port 3 at the top of the side wall.

[0039] The second feed port 9 is installed at the bottom of the side wall of the secondary steel-lined polytetrafluoroethylene reactor, and the second overflow port is installed at the top of the side wall;

[0040] The third feed port is installed at the bottom of the side wall of the three-stage steel-lined polytetrafluoroethylene reactor, and the third overflow port 10 is installed at the top of the side wall.

[0041] The first overflow port 3 is connected to the second feed port 9 through the first pipe, and the second overflow port is connected to the third feed port through the second pipe.

[0042] Further optimization of the design: the top of the first-stage steel-lined PTFE reactor is equipped with a first tail gas outlet 4; the top of the second-stage steel-lined PTFE reactor is equipped with a second tail gas outlet 11; and the top of the third-stage steel-lined PTFE reactor is equipped with a third tail gas outlet 12.

[0043] The scheme is further optimized so that the first exhaust gas outlet 4, the second exhaust gas outlet 11 and the third exhaust gas outlet 12 are respectively connected to exhaust gas treatment equipment. The internal structure and working principle of the exhaust gas treatment equipment are existing technologies and will not be described in detail here.

[0044] Further optimization of the scheme: heat exchanger 7 adopts a silicon carbide tube heat exchanger with steam as the heat exchange medium; in the silicon carbide tube heat exchanger, the slurry flows through the tube side and the heating medium flows through the shell side, which can heat the slurry to the required reaction temperature and will not introduce impurities into the reaction system.

[0045] Further optimization of the design involves using a stirring motor as the drive component, which makes the rotation speed of the double-layer stirring paddle body 5 controllable.

[0046] Further optimization of the design resulted in the use of PTFE-lined steel reactors for the first, second, and third stages, which offer excellent corrosion resistance and wear resistance.

[0047] Working principle:

[0048] The mixture of rare earth minerals and sulfuric acid solution is continuously and uniformly added from the first feed port 2 at the lower left side wall of the primary steel-lined polytetrafluoroethylene reactor.

[0049] When the stirring motor is turned on, as the slurry in the reactor increases, the heat exchanger 7 will be filled with slurry. As the double-layer stirring paddle body 5 of the slurry circulation heating component rotates under the drive of the stirring motor, the double-layer stirring paddle body 5 has a suction force, and the slurry in the heat exchanger 7 will be drawn from the slurry circulation inlet 8 into the primary steel-lined polytetrafluoroethylene reactor. At the same time, the slurry in the primary steel-lined polytetrafluoroethylene reactor will flow out of the primary steel-lined polytetrafluoroethylene reactor from the slurry circulation outlet 6 and enter the heat exchanger 7, realizing the circulation of the slurry in the heat exchanger 7. The slurry exchanges heat with the heating medium in the heat exchanger 7 to achieve external heating.

[0050] As the slurry is continuously added, it flows upward until it flows out of the first overflow port 3, and then enters the secondary steel-lined polytetrafluoroethylene reactor through the second feed port 9 via the connected first pipe. Since this device is continuously fed, the slurry will flow out from the overflow port of each reactor. The heating reaction process of the slurry will generate a mixed gas of hydrogen fluoride, silicon tetrafluoride, water vapor and sulfuric acid mist. The mixed gas will enter the tail gas treatment device through the exhaust port of each reactor.

[0051] After reacting in the multi-stage reactor for 1-4 hours, the slurry is finally discharged from the third overflow port 10 of the secondary steel-lined polytetrafluoroethylene reactor.

[0052] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A self-priming heating rare earth mineral slurry decomposition device, characterized in that: The multi-stage series steel-lined polytetrafluoroethylene reactor (1) includes a first-stage steel-lined polytetrafluoroethylene reactor, a second-stage steel-lined polytetrafluoroethylene reactor and a third-stage steel-lined polytetrafluoroethylene reactor connected in series. The primary steel-lined polytetrafluoroethylene reactor, the secondary steel-lined polytetrafluoroethylene reactor, and the tertiary steel-lined polytetrafluoroethylene reactor are each equipped with a slurry circulation heating assembly; Double-layer agitator assemblies are installed in the primary steel-lined polytetrafluoroethylene (PTFE) reactor, the secondary steel-lined PTFE reactor, and the tertiary steel-lined PTFE reactor, respectively.

2. The self-priming heating rare earth ore slurry phase decomposition device according to claim 1, characterized by: The slurry circulation heating assembly includes a circulation pipe and a heat exchanger (7) installed on the circulation pipe; the circulation pipe is fixedly connected to and connected to the outer wall of the primary steel-lined polytetrafluoroethylene reactor, the outer wall of the secondary steel-lined polytetrafluoroethylene reactor, and the outer wall of the tertiary steel-lined polytetrafluoroethylene reactor.

3. The self-priming heating rare earth ore slurry phase decomposition device according to claim 1, characterized by: The double-layer stirring paddle assembly includes a driving component and a double-layer stirring paddle body (5). The three driving components are respectively installed on the top wall of the first-stage steel-lined polytetrafluoroethylene reactor, the top wall of the second-stage steel-lined polytetrafluoroethylene reactor, and the top wall of the third-stage steel-lined polytetrafluoroethylene reactor. The double-layer impeller body (5) is mounted on the output shaft of the drive component, and the three double-layer impeller bodies (5) extend into the first-stage steel-lined polytetrafluoroethylene reactor, the second-stage steel-lined polytetrafluoroethylene reactor, and the third-stage steel-lined polytetrafluoroethylene reactor, respectively.

4. The self-priming heating rare earth ore slurry phase decomposition device according to claim 1, characterized by: The first feed port (2) is installed at the bottom of the side wall of the first-stage steel-lined polytetrafluoroethylene reactor, and the first overflow port (3) is installed at the top of the side wall. The second feed port (9) is installed at the bottom of the side wall of the secondary steel-lined polytetrafluoroethylene reactor, and the second overflow port is installed at the top of the side wall; The third feed port is installed at the bottom of the side wall of the three-stage steel-lined polytetrafluoroethylene reactor, and the third overflow port (10) is installed at the top of the side wall. The first overflow port (3) is connected to the second feed port (9) through a first pipe, and the second overflow port is connected to the third feed port through a second pipe.

5. The self-priming heating rare earth ore slurry phase decomposition device according to claim 1, characterized by: The first-stage steel-lined polytetrafluoroethylene reactor is equipped with a first tail gas outlet (4) at the top, the second-stage steel-lined polytetrafluoroethylene reactor is equipped with a second tail gas outlet (11) at the top, and the third-stage steel-lined polytetrafluoroethylene reactor is equipped with a third tail gas outlet (12) at the top.

6. The self-priming heating rare earth ore slurry phase decomposition device according to claim 5, characterized by: The first exhaust gas outlet (4), the second exhaust gas outlet (11) and the third exhaust gas outlet (12) are respectively connected to exhaust gas treatment equipment.

7. The self-priming heating rare earth ore slurry phase decomposition device according to claim 2, characterized by: The heat exchanger (7) is a silicon carbide heat exchanger.

8. The self-priming heating rare earth ore slurry phase decomposition device according to claim 3, characterized by: The driving component is a stirring motor.

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