Self-cleaning fused salt filtering device and multi-stage filtering system

Abstract

The utility model discloses a self-cleaning fused salt filtering device and a multi-stage filtering system. The filtering device comprises a feeding mechanism, a filtering mechanism and a material receiving container, the feeding mechanism comprises a first feeding pipeline, the filtering mechanism comprises a rotary brushing assembly and a filtering connector, the top of the filtering connector is communicated with the discharging end of the first feeding pipeline, the bottom of the filtering connector is communicated with the material receiving container, a filtering net is arranged at the bottom of the filtering connector, and the rotary brushing assembly comprises arc-shaped fan blades, a rotary supporting shaft and a brushing piece. The arc-shaped fan blade is fixedly connected to the rotary supporting shaft, at least part of the arc-shaped fan blade is located in the discharging end of the first feeding pipeline, one end of the rotary supporting shaft is fixedly connected with the cleaning and brushing part, and the rotary cleaning and brushing assembly is configured in the mode that the arc-shaped fan blade drives the cleaning and brushing part to rotate and brush the filter screen under the action of the fused salt fluid. Fused salt flows in the first feeding pipeline to act on the arc-shaped fan blades, the brushing piece is driven to rotate to conduct self-cleaning on the filter screen, and the blocking condition of the filter screen can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of high-temperature molten salt impurity removal, and in particular to a self-cleaning molten salt filtering device and a multi-stage filtering system. Background Art

[0002] In the prior art, the production of metallic lithium is mainly carried out by electrolyzing lithium chloride and potassium chloride into a molten salt electrolyte. This production process usually requires heating the molten salt to a high temperature to ensure that it is in a molten state, thereby promoting the smooth progress of the electrolysis reaction. However, during the long electrolysis process, the graphite particles on the anode rod will fall into the electrolyte due to corrosion. These graphite particles and other insoluble substances will cause a large number of insoluble particles to appear in the molten salt under the long-term influence of high temperature and impurity ions. Over time, these insoluble particles continue to accumulate, which not only affects the efficiency of the electrolysis process, but also causes the metallic lithium produced to contain more impurities.

[0003] In order to deal with the above problems, in actual production, filters are usually used to filter insoluble matter in molten salt. However, as time goes by and the number of filtrations increases, these filters are easily clogged, which affects production efficiency. Some existing technical solutions attempt to achieve better filtering effects by using filters of different mesh sizes for multi-layer filtration, but this method still cannot avoid the problem of clogging after long-term use. In addition, some solutions suggest using filter discs with larger areas and replacing them regularly, but the operation is more difficult in high temperature environments and increases production costs. Some patents have proposed related solutions. For example, patent CN106283112A proposes a technology for purifying molten salt using electrochemical methods, but it mainly targets impurity ions in molten salt rather than insoluble impurities, so it has limited effect on improving electrolysis efficiency and improving the purity of metallic lithium.

[0004] In summary, the accumulation of insoluble particles in molten salts is a common problem in existing lithium metal production technologies, severely impacting electrolysis efficiency and product quality. While some existing technologies have attempted to address this issue, they still face numerous shortcomings in practical applications and require further optimization.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a self-cleaning molten salt filtering device and a multi-stage filtering system.

[0007] The utility model is achieved in this way:

[0008] In a first aspect, the utility model provides a self-cleaning molten salt filtering device, which comprises: a feeding mechanism, a filtering mechanism and a material receiving container;

[0009] The feeding mechanism includes a first feeding pipe, the filtering mechanism includes a rotating brush assembly and a filter joint, the top of the filter joint is connected to the discharge end of the first feeding pipe, the bottom of the filter joint is provided with a filter screen, and the bottom of the filter joint is connected to the material receiving container, the rotating brush assembly includes an arc-shaped fan blade, a rotating support shaft and a cleaning member in contact with the filter screen, the arc-shaped fan blade is fixedly connected to the rotating support shaft, and the arc-shaped fan blade is at least partially located inside the discharge end of the first feeding pipe, one end of the rotating support shaft is fixedly connected to the cleaning member, and the rotating brush assembly is configured so that the arc-shaped fan blade drives the cleaning member to rotate and clean the filter screen under the action of the molten salt fluid.

[0010] In an optional embodiment, the outer diameter of the arc-shaped fan blade is 3 / 4 to 4 / 5 of the inner diameter of the discharge end of the first feed pipe.

[0011] In an optional embodiment, the filter joint is tubular, the inner diameter of which is larger than the inner diameter of the discharge end of the first feed pipe, and the cleaning range of the cleaning member covers the entire filter screen.

[0012] In an optional embodiment, the cleaning brush is a wire brush that covers the entire filter screen, and the wire brush is fixedly connected to the rotating support shaft via a fixed support member.

[0013] In an optional embodiment, the feeding mechanism also includes a sealed storage tank and a pressurizing component, the sealed storage tank is provided with a second feeding pipe, the bottom of the sealed storage tank is connected to the first feeding pipe, and the first feeding pipe is provided with a first control valve, the pressurizing component includes a pressurizing pipe, a pressurizing pump and a pressure gauge, one end of the pressurizing pipe is connected to the sealed storage tank, and the other end is connected to the pressurizing pump, and the pressure gauge is provided on the pressurizing pipe.

[0014] In an optional embodiment, the second feeding pipe is further provided with a heating device.

[0015] In an optional embodiment, the filter joint is further provided with a waste discharge pipe communicated with the interior thereof, and the waste discharge pipe is provided with a second control valve and a suction pump.

[0016] In an optional embodiment, a waste storage tank is further provided at the outlet end of the waste discharge pipe.

[0017] In the second aspect, the utility model provides a kind of multistage filtration system, it at least includes two through pipeline series connection as described in any one of preceding embodiment self-cleaning molten salt filter device, and the aperture of the filter screen of the self-cleaning molten salt filter device of front end is greater than the aperture of the filter screen of the self-cleaning molten salt filter device of rear end.

[0018] In optional implementation, the aperture of the filter screen of the self-cleaning molten salt filter device of first stage is 30 μm-100 μm, and the aperture of the filter screen of the self-cleaning molten salt filter device of second stage is 1 μm-30 μm.

[0019] The utility model has following beneficial effect: through utilize the flow of molten salt in first feed pipe and act on arc fan blade, arc fan blade rotates to drive brush cleaning piece rotation, to filter molten salt simultaneously, can be self-cleaning to filter screen, can effectively reduce the jamming condition of filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced to the drawings needed to be used in embodiment, it should be understood that the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art comes, under the premise of not paying creative labor, can also obtain other related drawings according to these drawings.

[0021] Figure 1 The structural schematic diagram of the self-cleaning molten salt filter device provided for the first embodiment is shown in the figure.

[0022] Figure 2 The structural schematic diagram of the filter mechanism of the self-cleaning molten salt filter device provided for the first embodiment is shown in the figure.

[0023] Figure 3 The structural schematic diagram of the multistage filtration system provided for the second embodiment is shown in the figure.

[0024] Figure legend: 1-self-cleaning molten salt filter device;10-feeding mechanism;11-sealing storage tank;12-first feed pipe;121-first control valve;13-second feed pipe;131-feeding control valve;14-pressurizing assembly;141-pressurizing pipe;142-pressurizing pump;143-pressure gauge;20-filter mechanism;21-waste discharge pipe;211-second control valve;22-waste storage tank;23-rotary brush assembly;231-arc fan blade;232-rotary support shaft;233-brush cleaning piece;24-filter joint;25-filter screen;30-receiving container;2-multistage filtration system. DETAILED DESCRIPTION

[0025] The purposes, technical solutions and advantages of the embodiments of the present application are clearer, and the technical solutions of the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0026] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present application, it should be noted that: if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product of the present application when it is usually placed, only for the convenience of description

[0027] The present application is simplified description, but is not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second", "third" and the like appear, they are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0028] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict. The features and performance of the present application will be further described in detail below in combination with the embodiments.

[0029] First embodiment

[0030] Participation Figure 1 The present embodiment provides a self-cleaning molten salt filtering device 1, which comprises a feeding mechanism 10, a filtering mechanism 20 and a receiving container 30 connected in sequence.

[0031] Specifically, in this embodiment, the feeding mechanism 10 includes a sealed storage tank 11 and a first feeding pipe 12 for communicating with the filtering mechanism 20. Among them, the sealed storage tank 11 is used to temporarily store high-temperature molten salt. It should be noted that in order to keep the molten salt fluid, it is necessary to make the molten salt have a certain temperature. The sealed storage tank 11 can be provided with a heating device, such as a partition heater. The material of the sealed storage tank 11 can be a metal material that is easy to conduct heat. In order to avoid the corrosion of the high-temperature molten salt to the sealed storage tank 11, the sealed storage tank 11 can be made of a high-temperature and corrosion-resistant metal material. The first feeding pipe is connected to the bottom of the sealed storage tank 11. Under the action of gravity, the high-temperature molten salt can enter the first feeding pipe 12 and then further enter the filtering mechanism 20 for filtration.

[0032] In this embodiment, the section of the first feed pipe 12 that is connected to the bottom of the sealed storage tank 11 is a vertical section, so that the high-temperature molten salt can flow better into the first feed pipe 12. A first control valve 121 is also provided on the first feed pipe 12. The first control valve 121 can control the flow rate of the first feed pipe 12 entering the filtering mechanism 20 to achieve a better filtering effect.

[0033] Furthermore, the sealed storage tank 11 is also provided with a second feed pipe 13, which is mainly used to replenish high-temperature molten salt into the sealed storage tank 11. In order to maintain the better fluidity of the high-temperature molten salt, the second feed pipe 13 is provided with a heating device that can be used to heat the pipe, and the outer surface of the second feed pipe 13 can also be provided with an insulation layer. Among them, one end of the second feed pipe 13 extends vertically to the interior of the sealed storage tank 11, and extends to the bottom of the sealed storage tank 11 as much as possible to better maintain the temperature of the high-temperature molten salt and make it have better fluidity. It should be noted that in order to better control the filtration of the high-temperature molten salt, the second feed pipe 13 is provided with a feeding control valve 131, which can control the amount of high-temperature molten salt entering the storage tank.

[0034] Furthermore, since the molten salt has a high density and contains large particles, if it is simply naturally transported into the first feed pipe 12 under gravity, on the one hand, the transport power is insufficient, and on the other hand, the molten salt is not easy to pass through the filtering mechanism 20, which is prone to blockage.

[0035] Therefore, a pressurizing assembly 14 is provided to provide power for the filtration of the molten salt and reduce the risk of clogging. The pressurizing assembly 14 includes a pressurizing pipe 141, a pressure pump 142, and a pressure gauge 143. One end of the pressurizing pipe 141 is connected to the sealed storage tank 11, and the other end is connected to the pressure pump 142. The pressurizing pipe 141 is provided with a pressure gauge 143. The pressure pump 142 can pump air into the pressurizing pipe 141, and then into the sealed storage tank 11, and form a certain pressure in the sealed storage tank 11. The second pressure gauge 143 can be used to observe whether the pressure in the sealed storage tank 11 reaches the preset pressure. That is, the power of the high-temperature molten salt passing through the filtering mechanism 20 is effectively enhanced by pressurization, thereby improving the filtration efficiency.

[0036] It should be noted that in other embodiments, the pressurizing component 14 may not be provided, and the delivery power of the high-temperature molten salt may be enhanced by other means, for example, a power delivery pump may be installed on the first feed pipe 12, and an unsealed storage tank may be used to enhance the delivery power of the high-temperature molten salt in other ways.

[0037] Further, see Figure 1 The end of the first feed pipe 12 away from the sealed storage tank 11 is connected to the filtering mechanism 20. Specifically, in this embodiment, the end of the first feed pipe 12 connected to the filtering mechanism 20 is a vertical end, and the horizontal position of the sealed storage tank 11 is higher than the filtering mechanism 20, so that the high-temperature molten salt can be better filtered through the filtering mechanism 20 under the action of gravity.

[0038] See also Figure 2 The filter mechanism 20 includes a rotating brush assembly 23 and a filter connector 24. A filter chamber is provided within the filter connector 24. The top of the filter connector 24 is connected to the discharge end of the first feed pipe 12. A filter screen 25 is provided at the bottom of the filter connector 24. The high-temperature molten salt in the first feed pipe 12 enters the filter connector 24 and is further filtered through the filter screen 25. It should be noted that the filter screen 25 needs to be a high-temperature resistant filter screen 25.

[0039] Furthermore, in this embodiment, the rotary cleaning assembly 23 includes an arc-shaped fan blade 231, a rotating support shaft 232 and a cleaning member 233 in contact with the filter screen 25. The arc-shaped fan blade 231 is fixedly connected to the rotating support shaft 232. The arc-shaped fan blade 231 is divided into multiple pieces, and multiple arc-shaped fan blades 231 are evenly fixed on the axial surface of the rotating support shaft 232. The arc-shaped fan blade 231 can rotate under the flow of molten salt fluid, thereby driving the rotating support shaft 232 to rotate, and then driving the cleaning member 233 to rotate. Since the cleaning member 233 and the filter screen 25 are in contact, the selection of the cleaning member 233 can rotate and clean the filter screen 25, effectively reducing the blockage of the filter screen 25. In this embodiment, the curved blades 231 are located inside the first feed pipe 12. The outer diameter of the curved blades 231 is 3 / 4 to 4 / 5 of the inner diameter of the discharge end of the first feed pipe 12. The rotary support shaft 232 extends downward from the first feed pipe 12 to the interior of the filter joint 24. The bottom of the rotary support shaft 232 is fixedly connected to the cleaning brush assembly. Under the natural gravity, the cleaning brush member 233 of the entire rotary cleaning brush assembly 23 is placed on the filter screen 25. Therefore, the entire rotary cleaning brush assembly 23 is confined to the connection between the filter joint 24 and the first feed pipe 12, and the curved blades 231 will not be deflected by the molten salt and affect its rotational power.

[0040] The high-temperature molten salt fluid enters the filter joint 24 through the gaps between the arc-shaped fan blades 231 and the gaps between the arc-shaped fan blades 231 and the inner wall of the first feed pipe 12, and then passes through the filter mesh 25 for filtration. During the filtration process, the cleaning member 233 continuously cleans the filter mesh 25, thereby improving the filtration efficiency and avoiding clogging.

[0041] Furthermore, to maintain optimal filtering effectiveness, the filter connector 24 is tubular, with an inner diameter larger than that of the outlet end of the first feed pipe 12. This means that the filter connector 24 provides a larger filter cavity, allowing impurities that cannot pass through the filter screen 25 to settle. In this embodiment, the filter connector 24 and the first feed pipe 12 can be connected via a threaded or flanged connection, facilitating cleaning, repair, or replacement of the filter screen 25 in the event of severe clogging or damage to the rotary brush assembly 23. Of course, in other embodiments, the filter connector 24 and the first feed pipe 12 can also be welded.

[0042] In addition, in order to achieve a better self-cleaning effect, the cleaning range of the cleaning brush 233 covers the entire filter 25. Specifically, in this embodiment, the cleaning brush 233 is a wire brush that covers the entire filter 25. The wire brush can achieve a better cleaning effect and is also conducive to the high-temperature molten salt directly passing through the pores of the wire brush and further filtering through the filter 25. In order to enable the wire brush to have a better fixed support effect, in this embodiment, the wire brush is fixedly connected to the rotating support shaft 232 through a fixed support member, that is, the bottom of the rotating support shaft 232 is fixedly connected to a fixed support member (such as a plurality of evenly distributed support rods) perpendicular to the rotating support shaft 232, and the wire brush is fixedly connected to the fixed support member.

[0043] Furthermore, the bottom of the filter joint 24 is connected to the material receiving container 30, and the high-temperature molten salt is directly discharged into the material receiving container 30 after filtration. It should be noted that the bottom of the filter joint 24 can be directly connected to the feed port of the material receiving container 30, or it can be directly located above the feed port of the material receiving container 30, as long as the filtered molten salt can enter the material receiving container 30 for storage.

[0044] Furthermore, although the rotating brush assembly 23 can achieve a self-cleaning effect, that is, continuously clean the filter 25, the filtered impurity particles will continue to accumulate above the filter 25. When the impurity concentration accumulates to a certain level, it will still affect the filtering effect and even cause blockage. Therefore, in this embodiment, the filter joint 24 is also provided with a waste discharge pipe connected to its interior, and the waste discharge pipe is provided with a second control valve 211. When impurities accumulate to a certain level and block the filter 25, the pressure in the storage tank increases. At this time, the second control valve 211 can be opened, and the molten salt containing a high impurity concentration is discharged through the waste discharge pipe 21. When the molten salt is introduced again, the filter 25 is cleaned again under the action of the wire brush. Of course, in some other embodiments, a suction pump can also be provided on the waste discharge pipe 21 to perform timed auxiliary pressure component 14 suction when the impurity concentration has not completely accumulated to block the filter 25, so as to maintain long-term effective filtration efficiency.

[0045] In this embodiment, a waste storage tank 22 is further provided at the outlet end of the waste discharge pipe 21, through which the discharged waste can be stored and further transferred for processing.

[0046] Based on the above description of the structure of the self-cleaning molten salt filter device 1 of this embodiment, the specific implementation process is as follows:

[0047] 1. Open the feeding control valve 131 , and the impurity-containing molten salt enters the sealed storage tank 11 through the second feeding pipe 13 .

[0048] 2. Close the feeding control valve 131 , start the pressure pump 142 , open the first control valve 121 , and close the second control valve 211 .

[0049] 3. Under the action of air pressure and its own gravity, the impurity molten salt enters the filter mechanism 20, and the impurity molten salt enters the filter joint 24 from the gaps between the curved fan blades 231 and the gaps between the curved fan blades 231 and the inner wall of the first feed pipe 12, and then passes through the filter screen 25 for filtration. During this process, the curved fan blades 231 rotate due to the flow of molten salt, driving the wire brush below to rotate, cleaning the insoluble particles on the filter screen and keeping the insoluble particles suspended.

[0050] 4. As the filtration proceeds, the concentration of insoluble particles becomes higher and higher, the filtration flow rate decreases, the speed of the wire brush also decreases, the filter screen 25 begins to be clogged, and the pressure in the sealed storage tank 11 begins to increase.

[0051] 5. Open the second control valve 211, and the molten salt flows out of the waste discharge pipe 21 into the waste storage tank 22. As the flow rate of the molten salt increases, the brush is driven to clean the filter screen 25. The filter screen 25 continues to filter, and the pressure in the sealed storage tank 11 begins to decrease.

[0052] 6. Close the second control valve 211, the pressure in the sealed storage tank 11 begins to increase, and filtration proceeds normally.

[0053] Second embodiment

[0054] This embodiment provides a multi-stage filtration system 2, which includes two self-cleaning molten salt filtration devices 1 of the first embodiment connected in series through a pipeline, and the pore size of the filter mesh 25 of the front self-cleaning molten salt filtration device 1 is larger than the pore size of the filter mesh 25 of the rear self-cleaning molten salt filtration device 1.

[0055] It should be noted that, generally speaking, one self-cleaning molten salt filter device 1 is arranged above another self-cleaning molten salt filter device 1 so as to utilize gravity-assisted transportation of the molten salt.

[0056] The multi-stage filtration system 2 of this embodiment can be used to filter insoluble matter from electrolyte molten salt during electrolyte electrolysis. The insoluble impurities generated during electrolyte electrolysis include some insoluble impurities present in the raw materials, as well as corrosion products of the electrode materials and sloughed materials from the electrolytic cell lining. These impurities are complex in composition and have a wide particle size distribution. Using a single filtration step can easily lead to clogging of the filter pores, preventing optimal filtration performance and effectiveness. Therefore, to meet these requirements, this embodiment employs a two-stage filtration process.

[0057] Furthermore, in this embodiment, the pore size of the filter mesh 25 of the first-stage self-cleaning molten salt filter device 1 is 30μm~100μm, and preferably can also be selected as 30μm~50μm, and the pore size of the filter mesh 25 of the second-stage self-cleaning molten salt filter device 1 is 1μm~30μm, and preferably can also be selected as 50μm~15μm.

[0058] It should be noted that, in other embodiments, the second-stage self-cleaning molten salt filter device 1 may be configured to include a sealed material storage tank 11 and a pressurizing component 14, depending on actual conditions. That is, in some embodiments, when the secondary filtration is not blocked, the second-stage self-cleaning molten salt filter device 1 may not include a sealed material storage tank 11 and a pressurizing component 14, and the receiving container 30 of the first-stage self-cleaning molten salt filter device 1 and the receiving container 30 of the second-stage self-cleaning molten salt filter device 1 may be directly connected through a pipeline, and the receiving container 30 of the upper stage may be arranged above the receiving container 30 of the lower stage.

[0059] To sum up, the embodiment of the present invention utilizes the flow of molten salt in the pipeline to drive the wire brush to clean the filter screen 25 while filtering, and at the same time pressurizes the filter mechanism 20, thereby increasing the flow rate during filtration, which not only increases the filtration efficiency, but also increases the effect of cleaning the filter screen 25.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A self-cleaning molten salt filter device, characterized in that: It includes: Feeding mechanism, filtering mechanism and material receiving container; The feeding mechanism includes a first feeding pipe, the filtering mechanism includes a rotating brush assembly and a filter joint, the top of the filter joint is connected to the discharge end of the first feeding pipe, the bottom of the filter joint is provided with a filter screen, and the bottom of the filter joint is connected to the material receiving container, the rotating brush assembly includes an arc-shaped fan blade, a rotating support shaft and a cleaning member in contact with the filter screen, the arc-shaped fan blade is fixedly connected to the rotating support shaft, and the arc-shaped fan blade is at least partially located inside the discharge end of the first feeding pipe, one end of the rotating support shaft is fixedly connected to the cleaning member, and the rotating brush assembly is configured so that the arc-shaped fan blade drives the cleaning member to rotate and clean the filter screen under the action of the molten salt fluid.

2. The self-cleaning molten salt filtration device according to claim 1, characterized in that: The outer diameter of the arc-shaped fan blade is 3 / 4 to 4 / 5 of the inner diameter of the discharge end of the first feed pipe.

3. The self-cleaning molten salt filtering device according to claim 1, characterized in that: The filter joint is tubular, and its inner diameter is larger than the inner diameter of the discharge end of the first feed pipe, and the cleaning range of the cleaning member covers the entire filter screen.

4. The self-cleaning molten salt filtering device according to claim 3, characterized in that: The cleaning brush is a wire brush that covers the entire filter screen, and the wire brush is fixedly connected to the rotating support shaft through a fixed support member.

5. The self-cleaning molten salt filtration device according to any one of claims 1 to 4, characterized in that: The feeding mechanism also includes a sealed storage tank and a pressurizing component. The sealed storage tank is provided with a second feeding pipe. The bottom of the sealed storage tank is connected to the first feeding pipe, and the first feeding pipe is provided with a first control valve. The pressurizing component includes a pressurizing pipe, a pressurizing pump and a pressure gauge. One end of the pressurizing pipe is connected to the sealed storage tank, and the other end is connected to the pressurizing pump. The pressure gauge is provided on the pressurizing pipe.

6. The self-cleaning molten salt filtering device according to claim 5, characterized in that: The second feed pipe is also provided with a heating device.

7. The self-cleaning molten salt filtration device according to any one of claims 1 to 4, characterized in that: The filter joint is further provided with a waste discharge pipe communicated with the interior thereof, and the waste discharge pipe is provided with a second control valve.

8. The self-cleaning molten salt filtering device according to claim 7, characterized in that: A waste storage tank is also provided at the outlet end of the waste discharge pipe.

9. A multi-stage filtration system, characterized in that: It comprises at least two self-cleaning molten salt filter devices according to any one of claims 1 to 8 connected in series through a pipeline, and the pore size of the filter screen of the front self-cleaning molten salt filter device is larger than the pore size of the filter screen of the rear self-cleaning molten salt filter device.

10. The multi-stage filtration system according to claim 9, characterized in that: The pore size of the filter screen of the first-stage self-cleaning molten salt filter device is 30 μm to 100 μm, and the pore size of the filter screen of the second-stage self-cleaning molten salt filter device is 1 μm to 30 μm.

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