Large-flux uranyl nitrate solution backwashing and filtering device and method

Abstract

A large-flux uranyl nitrate solution backwashing filtering device comprises a filtering shell and a base, and the filtering shell comprises a lower end shell, a middle shell and an upper end shell; the barrel-shaped filter element is located in the filter shell, a hollow backwashing rotating shaft is arranged in the center of the interior of the barrel-shaped filter element, and the hollow backwashing rotating shaft penetrates through the barrel-shaped filter element upper end cover and the upper end shell and extends to the position above the upper end shell; a large-flux uranyl nitrate solution backwashing filtering method comprises the following steps that S1, a uranyl nitrate solution is guided into a filtering shell through a material inlet, and filtered materials are guided out from a liquid guiding-out pipe; s2, judging whether the barrel-shaped filter element is blocked or not through a differential pressure gauge, and backwashing the barrel-shaped filter element by connecting an inlet joint with an outlet of an external cleaning infusion pump; s3, the cleaning liquid obtained after back flushing of the barrel-shaped filter element is guided out from a waste outlet and a liquid guide-out pipe.

Description

Technical Field

[0001] This patent relates to the field of uranium purification and conversion technology, and specifically to a high-throughput uranyl nitrate solution backwash filtration device. Background Art

[0002] In the domestic uranium purification production line, natural uranium ore concentrate is reacted with dilute nitric acid to prepare uranyl nitrate solution. During the dissolution process, a large number of insoluble solid particles that can pass through small filtering devices such as Y-type filters and blue filters will be produced. The solid content of the solution is about 3% to 5%, of which the highest silicon content is 7‰. The delivery flow rate of uranyl nitrate solution is 4m 3 / h-6m 3 / h, and the high-concentration uranyl nitrate solution has the characteristics of high density, high viscosity and easy crystallization. If the solid particles in the solution are not removed in time, the accumulated solid matter will carry the uranyl nitrate solid and deposit inside the equipment, making it difficult to clean the equipment and increasing the failure rate, thus affecting the stable operation of the production line. Therefore, a filtering device is required to filter and purify the uranyl nitrate solution. When using traditional filters for solid-liquid separation, it is found that there is a serious adhesion phenomenon. Solid impurities will adhere to the filter element of the filtering device, causing the filter to be blocked and the filtering efficiency to be reduced. After the filter element is blocked, the filter needs to be disassembled and the filter element is taken out for cleaning, resulting in the shutdown of the production line and inevitable environmental pollution at the disassembly and cleaning site. In order to keep the production from stopping, a bypass pipeline must be set up and two filters must be used, one for operation and one for standby. Although the parking problem is solved, the investment in equipment is increased, and the pollution on site cannot be solved; the existing backwashing filter, especially the high-pressure backwashing filter, only transports the cleaning liquid into the filter element through a large flow rate to perform backwashing, but the filter element is cleaned as a whole, which not only has a slow cleaning efficiency, but also requires a large amount of cleaning liquid, generating more waste liquid. Therefore, it is necessary to design a precision filter for filtering uranyl nitrate solution, which can realize backwashing function and has the ability of continuous operation. Summary of the invention

[0003] The purpose of the present invention is to provide a large-flux uranyl nitrate solution backwash filter device, which overcomes the problem of filter clogging caused by impurities in the uranyl nitrate solution adhering to the filter element. The structure is simple, the operation is simple, the frequency of dismantling and cleaning the filter device is reduced, and the manpower consumption is reduced.

[0004] The technical scheme of the present invention is as follows: a large-flux uranyl nitrate solution backwashing filter device comprises a filter housing and a base, wherein the filter housing comprises a lower end housing, a middle end housing and an upper end housing; the upper surface of the base is connected to the lower end housing through a foot column, the upper end of the lower end housing is sealedly connected to the middle end housing, the top end of the middle end housing is sealedly connected to the upper end housing, a support ring is provided at the lower end of the inner part of the filter housing, a barrel-shaped filter element is fixed to the upper end of the support ring through a flange, the barrel-shaped filter element is located inside the filter housing, a hollow backwashing shaft is provided at the inner center of the barrel-shaped filter element, the hollow backwashing shaft passes through the upper end cover of the barrel-shaped filter element and the upper end housing and extends to the top of the upper end housing, a flushing liquid inlet part connected to the hollow backwashing shaft is provided on the upper surface of the upper end housing, and a driving motor for driving the hollow backwashing shaft to rotate is provided at the upper end of the flushing liquid inlet part; flushing parts are evenly provided on the outer side of the hollow backwashing shaft;

[0005] A material inlet is provided in the middle of the side of the middle shell, a slag outlet is provided on one side of the lower shell, a liquid outlet pipe is provided in the middle of the lower end of the lower shell, a connecting joint 1 is provided on the side of the lower shell, and a connecting joint 2 is provided at the upper end of the side of the middle shell. Both connecting joint 2 and connecting joint 1 are connected to the differential pressure gauge through a conduit.

[0006] The flushing component comprises a connecting pipe fixed to the hollow backwashing rotating shaft, and a flushing head is fixed on the connecting pipe.

[0007] The flushing liquid inlet part includes an inlet joint and a barrel-shaped shell. The side of the barrel-shaped shell is provided with an inlet joint. The barrel-shaped shell is located at the upper end of the upper end shell, and the barrel-shaped shell is sealed and connected to the upper end shell and the hollow backwashing shaft. The interior of the barrel-shaped shell is connected to the hollow backwashing shaft.

[0008] The slag outlet is located at the upper end of the support ring.

[0009] A high-flux uranyl nitrate solution backwash filtration method comprises the following steps:

[0010] S1: introducing the uranyl nitrate solution into the filter housing through the material inlet, filtering the uranyl nitrate solution through the barrel filter element, and the filtered material is discharged from the liquid outlet pipe;

[0011] S2: Use the differential pressure gauge to determine whether the barrel filter element is blocked. When the pressure difference of the differential pressure gauge reaches 10kPa, it is determined that the barrel filter element is blocked. The inlet joint is connected to the outlet of the external cleaning pump to allow the cleaning liquid to enter the inside of the hollow backwashing shaft and then enter the flushing part to backwash the barrel filter element.

[0012] S3: The cleaning liquid after backwashing the barrel filter element is discharged from the waste outlet and the liquid outlet pipe.

[0013] In S1, a uranyl nitrate solution with a uranium concentration of 400 g / L to 500 g / L is introduced into the filter housing through the material inlet, and the material in the filter housing is filtered out by the barrel-shaped filter element 5 to filter out the material with a particle size greater than 20 μm.

[0014] In S2, the cleaning liquid is dilute nitric acid with a temperature of 20°C to 30°C, a pressure of 0.3MPa to 0.5MPa, and a concentration of 0.5mol / L to 2mol / L.

[0015] In S2, the hollow backwashing shaft is driven to rotate by the driving motor while flushing, and the flushing member is driven to rotate by the rotation of the hollow backwashing shaft.

[0016] In S2, the filter element 5 is disassembled and regenerated.

[0017] The remarkable effect of the present invention is that the device can detect the pressure difference between the material inlet and the liquid outlet pipe through the pressure differential gauge, so as to judge whether the barrel filter element is blocked, and can be connected to the outlet of the external cleaning liquid pump through the inlet joint, and the cleaning liquid is transported to the inside of the hollow backwashing shaft, and then enters the flushing part. While flushing, the driving motor can drive the hollow backwashing shaft to rotate, and the hollow backwashing shaft can drive the flushing part to rotate. The flushing liquid inside the hollow backwashing shaft can backwash the barrel filter element through the connecting pipe and the flushing head, so that the flushing is more comprehensive. The filter with backwashing function has a simple structure and is easy to operate. It not only makes monitoring more convenient, but also can backwash the filter, and the cleaning effect is better, reducing manpower consumption. The uranium-containing waste liquid generated by cleaning can also be collected and returned to the production line for continued use. The dissolved liquid after filtration reduces the impact on subsequent devices, reduces the equipment failure rate, and ensures the long-term safe and stable operation of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a high-flux uranyl nitrate solution backwash filtration device;

[0019] Figure 2 It is a magnified schematic diagram of the middle part;

[0020] In the figure: 1 base, 2 lower end shell, 3 middle shell, 4 upper end shell, 5 barrel filter element, 6 flushing part, 61 connecting pipe, 62 flushing head, 7 flushing liquid inlet part, 71 inlet joint, 72 barrel shell, 8 hollow backwashing shaft, 9 driving motor, 10 material inlet, 11 slag outlet, 12 liquid lead-out pipe, 13 support ring, 14 connecting joint 1, 15 connecting joint 2. DETAILED DESCRIPTION

[0021] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0022] The terms used in one or more embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of the present application. The singular forms of "a", "said" and "the" used in one or more embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of the present application refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that, although the terms first, second, etc. may be used to describe various information in one or more embodiments of the present application, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0024] A high-flux uranyl nitrate solution backwashing filter device comprises a filter housing and a base 1, wherein the filter housing comprises an end housing 2, a middle housing 3 and an upper housing 4; the upper surface of the base 1 is connected to the lower housing 2 via a foot column, the upper end of the lower housing 2 is sealedly connected to the middle housing 3, and the top of the middle housing 3 is sealedly connected to the upper housing 4; a support ring 13 is provided at the lower end of the filter housing, a barrel-shaped filter element 5 is fixed to the upper end of the support ring 13 via a flange, the barrel-shaped filter element 5 is located inside the filter housing, and the barrel-shaped filter element 5 comprises an upper end cover, a lower end cover and filter element structures around; a hollow backwashing rotating shaft 8 is provided at the inner center of the barrel-shaped filter element 5, and the hollow backwashing rotating shaft 8 passes through the upper end cover of the barrel-shaped filter element 5 and the upper housing 4 and The upper surface of the upper shell 4 is provided with a flushing liquid inlet 7 connected to the hollow backwashing shaft 8, and the upper end of the flushing liquid inlet 7 is provided with a driving motor 9 for driving the hollow backwashing shaft 8 to rotate. The outer side of the hollow backwashing shaft 8 is evenly provided with flushing parts 6. A material inlet 10 is provided in the middle of the side of the middle shell 3, and a slag outlet 11 is provided on one side of the lower shell 2. The slag outlet 11 is located at the upper end of the support ring 13. A liquid outlet pipe 12 is provided in the middle of the lower end of the lower shell 2. A connecting joint 14 is provided on the side of the lower shell 2, and a connecting joint 2 15 is provided on the upper end of the side of the middle shell 3. The connecting joint 2 15 and the connecting joint 1 14 are connected by a conduit. The differential pressure gauge can detect the pressure difference between the connecting joint 2 15 and the connecting joint 1 14 to determine whether the barrel-shaped filter element 5 is blocked. The flushing member 6 includes a connecting pipe 61 fixed to the hollow backwashing shaft 8. A flushing head 62 is fixed to the end of the connecting pipe 61 away from the hollow backwashing shaft 8. The flushing liquid inside the hollow backwashing shaft 8 can backwash the barrel-shaped filter element 5 through the connecting pipe 61 and the flushing head 62. The flushing liquid inlet member 7 includes a barrel-shaped shell 72 arranged at the upper end of the upper shell 4. The barrel-shaped shell 72 is sealed and connected to the upper shell 4 and the hollow backwashing shaft 8. The interior of the barrel-shaped shell 72 is connected to the interior of the hollow backwashing shaft 8, and the barrel-shaped shell 72 is sealed and connected to the upper shell 4 and the hollow backwashing shaft 8. An inlet joint 71 is provided on the side, through which the inlet joint 71 can be connected to the outlet of an external cleaning liquid pump. The external cleaning liquid pump can draw liquid into the interior of the barrel-shaped shell 72 through a catheter, and then the cleaning liquid enters the interior of the hollow backwash shaft 8, and the cleaning liquid inside the hollow backwash shaft 8 enters the flushing part 6. While flushing, the hollow backwash shaft 8 can be driven to rotate by rotating the driving motor 9, and the flushing part 6 can be driven to rotate by rotating the hollow backwash shaft 8, so that flushing is more comprehensive. The precision filter with backwashing function has a simple structure and is easy to operate. It not only makes monitoring more convenient, but also can backwash the filter, and the cleaning effect is better, providing convenience for people.

[0025] The flushing part 6, the hollow backwashing shaft 8, and the flushing liquid inlet part 7 are connected internally, and can be connected to the outlet of the external cleaning liquid pump through the inlet joint 71. The cleaning liquid enters from the flushing liquid inlet part 7, passes through the hollow backwashing shaft 8, and reaches the flushing part 6, and then backwashes the barrel-shaped filter element 5.

[0026] In use: During filtration, a uranyl nitrate solution with a uranium concentration of 400g / L to 500g / L can be introduced into the filter housing through the material inlet 10, and the material in the filter housing is filtered out through the barrel filter element 5 to filter out the material with a particle size greater than 20μm, and the filtered material is discharged from the liquid outlet pipe 12. The barrel filter element 5 is judged to be blocked by the pressure difference gauge. When the pressure difference reaches 10kPa, the inlet joint 71 can be connected to the outlet of the external cleaning liquid pump, and the external cleaning liquid pump can be drawn into the barrel shell 72 through the catheter, and then the temperature is 20℃ to 30℃, the pressure is 0.3MPa to 0.5MPa, and the concentration is 0.5mol / L to 2mol / L of dilute nitric acid cleaning liquid enters the interior of the hollow backwash shaft 8, and the cleaning liquid inside the hollow backwash shaft 8 enters the flushing part 6. While flushing, the hollow backwash shaft 8 can be driven to rotate by the driving motor 9, and the flushing part 6 can be driven to rotate by the rotation of the hollow backwash shaft 8. The flushing liquid inside the hollow backwash shaft 8 can backwash the barrel filter element 5 through the connecting pipe 61 and the flushing head 62. The flushing head 62 adopts a nozzle structure, which saves the use of cleaning liquid and reduces the amount of waste liquid generated. The cleaning liquid after flushing the barrel filter element 5 is discharged from the waste outlet 11 and the liquid outlet pipe 12 to complete the cleaning. The filter element 5 can be disassembled for regeneration, which further reduces the cost. The turbidity of the filtered material is reduced by 70% to 90%, and the silicon content is reduced by 95%, which has a positive impact on the stable operation of subsequent processes;

[0027] The above description is only a preferred embodiment of this patent and is not intended to limit this patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this patent should be included in the scope of protection of this patent.

[0028] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0029] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0030] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The optional embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the present application. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can understand and use the present application well.

Claims

1. A high-throughput uranyl nitrate solution backwash filtration device, characterized in that: The filter housing comprises a filter housing and a base (1), wherein the filter housing comprises a lower housing (2), a middle housing (3) and an upper housing (4); the upper surface of the base (1) is connected to the lower housing (2) via a foot column, the upper end of the lower housing (2) is sealedly connected to the middle housing (3), the top end of the middle housing (3) is sealedly connected to the upper housing (4), a support ring (13) is provided at the lower end of the filter housing, a barrel-shaped filter element (5) is fixed to the upper end of the support ring (13) via a flange, and the barrel-shaped filter element (5) is located inside the filter housing. A hollow backwashing shaft (8) is provided at the center of the barrel-shaped filter element (5), the hollow backwashing shaft (8) penetrates the upper end cover and the upper end shell (4) of the barrel-shaped filter element (5) and extends to the upper end of the upper end shell (4), a flushing liquid inlet (7) connected to the hollow backwashing shaft (8) is provided on the upper surface of the upper end shell (4), and a driving motor (9) for driving the hollow backwashing shaft (8) to rotate is provided at the upper end of the flushing liquid inlet (7); flushing parts (6) are evenly provided on the outer side of the hollow backwashing shaft (8); A material inlet (10) is provided in the middle of the side of the middle shell (3), a slag outlet (11) is provided on one side of the lower shell (2), a liquid outlet pipe (12) is provided in the middle of the lower end of the lower shell (2), a connecting joint 1 (14) is provided on the side of the lower shell (2), and a connecting joint 2 (15) is provided at the upper end of the side of the middle shell (3), and both the connecting joint 2 (15) and the connecting joint 1 (14) are connected to a differential pressure gauge through a conduit.

2. A high-flux uranyl nitrate solution backwashing filter device according to claim 1, characterized in that: The flushing member (6) comprises a connecting pipe (61) fixed to the hollow backwashing rotating shaft (8), and a flushing head (62) is fixed on the connecting pipe (61).

3. A high-flux uranyl nitrate solution backwashing filter device according to claim 1, characterized in that: The flushing liquid inlet member (7) comprises an inlet joint (71) and a barrel-shaped shell (72). The inlet joint (71) is provided on the side of the barrel-shaped shell (72). The barrel-shaped shell (72) is located at the upper end of the upper outer shell (4). The barrel-shaped shell (72) is sealedly connected to the upper outer shell (4) and the hollow backwashing rotating shaft (8). The interior of the barrel-shaped shell (72) is communicated with the hollow backwashing rotating shaft (8).

4. A high-flux uranyl nitrate solution backwashing filter device according to claim 1, characterized in that: The slag outlet (11) is located at the upper end of the support ring (13).

5. A high-flux uranyl nitrate solution backwash filtration method, using a high-flux uranyl nitrate solution backwash filtration device as claimed in claim 3, characterized in that: The following steps are involved: S1: introducing the uranyl nitrate solution into the filter housing through the material inlet (10), filtering the uranyl nitrate solution through the barrel filter element (5), and discharging the filtered material from the liquid outlet pipe (12); S2: judging whether the barrel-shaped filter element (5) is clogged by means of a differential pressure gauge. When the pressure difference of the differential pressure gauge reaches 10 kPa, it is judged that the barrel-shaped filter element (5) is clogged. The inlet joint (71) is connected to the outlet of the external cleaning pump so that the cleaning liquid enters the interior of the hollow backwashing shaft (8) and then enters the flushing part (6) to backwash the barrel-shaped filter element (5); S3: The cleaning liquid after backwashing the barrel-shaped filter element (5) is discharged from the waste outlet (11) and the liquid outlet pipe (12).

6. A high-flux uranyl nitrate solution backwash filtration method according to claim 5, characterized in that: In S1, a uranyl nitrate solution with a uranium concentration of 400 g / L to 500 g / L is introduced into the interior of the filter housing through the material inlet (10), and the material in the filter housing is filtered out through the barrel-shaped filter element (5) to filter out the material with a particle size greater than 20 μm.

7. A high-flux uranyl nitrate solution backwash filtration method according to claim 5, characterized in that: In S2, the cleaning liquid is dilute nitric acid with a temperature of 20°C to 30°C, a pressure of 0.3MPa to 0.5MPa, and a concentration of 0.5mol / L to 2mol / L.

8. A high-flux uranyl nitrate solution backwash filtration method according to claim 5, characterized in that: In S2, while flushing, the driving motor (9) drives the hollow backwashing shaft (8) to rotate, and the rotation of the hollow backwashing shaft (8) drives the flushing member (6) to rotate.

9. A high-flux uranyl nitrate solution backwash filtration method according to claim 5, characterized in that: In S2, the filter element (5) is disassembled and regenerated.

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