Equipment and method for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology

Abstract

The present invention discloses a device and method for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, relates to the technical field of fly ash water treatment, and aims to solve the technical problem of low treatment efficiency of fly ash water washing liquid, including a reaction tank and a membrane separation mechanism. The present invention sets a spiral filter membrane for filtering fly ash water washing liquid, sets a movable component to move on a horizontal axis component to drive the filter membrane to deform, so that the filter membrane can form a fly ash water washing liquid filtering form in which the spiral surfaces are in contact with each other and a spiral backwashing form in which the two ends are relatively far away. When filtering the suspended matter of the fly ash water washing liquid, the fly ash water washing liquid enters the reaction tank after being filtered by the membrane separation mechanism in the filtering form. During backwashing, the blockage of the filter pores is easily flushed out and guided out through the spiral surface of the filter membrane, thereby improving the backwashing effect, thereby improving the treatment efficiency of the fly ash water washing liquid, and solving the technical problem of low treatment efficiency of the fly ash water washing liquid.

Description

Technical Field

[0001] The invention relates to the technical field of fly ash water treatment, and more specifically to a device and a method for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology. Background Art

[0002] The resource recovery process of fly ash washing liquid involves fly ash washing and dechlorination. The fly ash washing liquid produced in this process needs to be treated to remove weight and hardness before evaporation to make salt. In the process of removing hardness, the fly ash washing liquid mainly uses sodium carbonate to produce calcium carbonate in the reaction tank. The calcium carbonate is washed, dried, and then ground and crushed to obtain ultrafine calcium carbonate.

[0003] The fly ash washing liquid produced by the existing fly ash washing and dechlorination process is subjected to membrane separation technology to remove suspended matter such as fine particles of fly ash, magnesium compounds, and macromolecular colloids to improve the purity and particle distribution of the subsequently produced calcium carbonate. The suspended matter in the fly ash washing liquid is easy to clog the filter pores of the filter membrane. Once the membrane is clogged, its separation efficiency will be greatly reduced, and the processing speed will also be seriously affected. In order to solve this problem, backwashing technology is usually used to clean the membrane surface. However, the suspended matter is difficult to be completely washed away during the backwashing process, and a tight clogging layer may be formed, which further aggravates the clogging of the filter pores, thereby affecting the processing efficiency of the fly ash washing liquid. In view of this, we propose a device and method for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology. Summary of the invention

[0004] The object of the present invention is to provide a device and method for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, so as to solve the technical problem of low treatment efficiency of fly ash water washing liquid.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a device and method for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, comprising a reaction tank, a membrane separation mechanism is arranged at the input end of the reaction tank, the membrane separation mechanism comprises an outer tube, the outer tube and the input end of the reaction tank are fixedly installed by a flange, an inner tube is movably arranged in the outer tube, a horizontal axis component is arranged in the inner tube, a movable component is movably arranged on the horizontal axis component, a filter membrane is arranged on the movable component, the filter membrane is spiral, and both ends of the filter membrane are respectively fixedly connected to the horizontal axis component and the movable component. The present invention provides a spiral filter membrane for filtering fly ash water washing liquid, and provides a movable component to move on the horizontal axis component to drive the filter membrane to deform, so that the filter membrane can form a fly ash water washing liquid filtering form in which the spiral surfaces are in contact with each other and a spiral backwashing form in which the two ends are relatively far away. When filtering suspended matter in the fly ash water washing liquid, the fly ash water washing liquid enters the reaction tank after being filtered by the membrane separation mechanism in the filtering form. During backwashing, the blockage in the filter pores is easily flushed out and guided out through the spiral surface of the filter membrane, thereby improving the backwashing effect, thereby improving the treatment efficiency of the fly ash water washing liquid, and solving the technical problem of low treatment efficiency of the fly ash water washing liquid.

[0006] Preferably, the inner surface of the outer tube is annularly arranged with a plurality of unidirectional rotating grooves in an evenly spaced structure, the depth of the unidirectional rotating grooves gradually increases in the counterclockwise direction, the gap between the unidirectional rotating grooves and the outer edge surface of the inner tube constitutes a forward limiting cavity, a limiting column is movably arranged in the forward limiting cavity, both ends of the limiting column are spherical head structures, and the limiting column and the forward limiting cavity are elastically connected by a spring A.

[0007] Preferably, the inner tube is rotatably arranged in the outer tube, and a plurality of thread guide grooves are provided in a circular equidistant structure on the inner surface of the inner tube, and a plurality of plug-in grooves are provided on the outer surface of the inner tube, and the plurality of plug-in grooves are respectively connected with the plurality of thread guide grooves, and the plurality of plug-in grooves are connected through a rotating ring groove.

[0008] Preferably, the inner surface of the outer tube is provided with a plurality of slide grooves in a circular equidistant structure relative to the rotating ring groove, and a slide column is movably connected to the slide groove, and the slide column and the slide groove are elastically connected by a spring B, and a plug-in column is fixed to the centripetal end of the slide column, and the plurality of plug-in columns are respectively plugged into and matched with the plurality of plug-in grooves, and the plug-in column is movably matched with the rotating ring groove.

[0009] Preferably, the transverse axis assembly includes an axis body, which is disposed in the inner tube. The axis body and the inner tube are fixedly connected via a plurality of connecting rods A arranged in an annular equidistant structure, and a limiting annular groove is provided on the axis body.

[0010] Preferably, the movable component includes an inner ring and an outer ring arranged in an inner and outer structure, the inner ring is sleeved on the shaft body, the inner ring and the outer ring are fixedly connected by a plurality of connecting rods B arranged in a circular equidistant structure, and a plurality of guide ball blocks are movably provided on the outer ring in a circular equidistant structure, and the plurality of guide ball blocks are movably connected to a plurality of the threaded guide grooves respectively, and the guide ball blocks are movably matched with the plug-in columns.

[0011] Preferably, the filter membrane is sleeved on the shaft body, one end of the filter membrane is fixedly connected to one of the connecting rods A, and the other end of the filter membrane is fixedly connected to one of the connecting rods B.

[0012] Preferably, a collar is fixedly provided at one end of the inner ring away from the connecting rod A, the collar is movably connected to the shaft body, and a plurality of vortex blades are fixedly provided on the surface of the collar in an annular structure with equal spacing.

[0013] Preferably, a plurality of limiting column grooves are provided in an annular equidistant structure on the inner edge surface of the collar, a movable column is movably connected in the limiting column groove, the movable column is elastically connected to the limiting column groove by a spring C, and the movable column is movably connected to the limiting ring groove by a hemispherical block.

[0014] A method for using a device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, comprising the following steps:

[0015] S1: Filtration of suspended matter in fly ash water wash;

[0016] First, the fly ash washing liquid is made to flow quickly so that the vortex blade drives the sleeve ring to rotate, and the inner ring drives the outer ring to rotate through the connecting rod B. Since the outer tube is fixed to the inner tube in one direction by the limiting column, the guide ball block moves on the threaded guide groove, so that the sleeve ring and the inner ring move on the shaft body, and the two ends of the filter membrane are relatively close until the spiral surfaces of the filter membrane contact each other. At this time, the hemispherical block moves along the surface of the shaft body to the limiting ring groove to form a clamping connection, so that the filter membrane maintains a filtering form in which the spiral surfaces contact each other. The flow rate of the fly ash washing liquid can be controlled according to actual production needs. The fly ash washing liquid is filtered by the membrane separation mechanism in the filtering form, and the fine particles of fly ash, magnesium compounds, macromolecular colloids and other suspended matter in the fly ash washing liquid are intercepted and enter the reaction tank;

[0017] S2: backwashing of membrane separation mechanism;

[0018] First, the backwashing liquid is reversely flushed into the membrane separation mechanism, so that the inner ring drives the outer ring to rotate in the opposite direction through the connecting rod B. At this time, the inner tube can rotate in the opposite direction relative to the outer tube, so that the guide ball block drives the inner tube to rotate through the threaded guide groove, and the plug-in column moves in the rotating ring groove until the plug-in column is inserted into the plug-in groove, so that the inner tube cannot rotate. The guide ball block moves in the opposite direction in the threaded guide groove, so that the two ends of the filter membrane are relatively far away from each other to form a spiral backwashing shape, and the filter pore block is easily flushed out and guided out through the spiral surface of the filter membrane. When the guide ball block moves to the tail end of the threaded guide groove, that is, the plug-in groove, the plug-in column is pushed out of the plug-in groove. At this time, the guide ball block drives the inner tube, the horizontal axis assembly and the spiral filter membrane to rotate as a whole. The movement of the filter membrane relative to the backwashing liquid further makes it easier to flush out the filter pore blockage.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention provides a spiral filter membrane for filtering fly ash water washing liquid, and provides a movable component to move on the horizontal axis component to drive the filter membrane to deform, so that the filter membrane can form a fly ash water washing liquid filtering form in which the spiral surfaces are in contact with each other and a spiral backwashing form in which the two ends are relatively far away. When filtering the suspended matter of the fly ash water washing liquid, the fly ash water washing liquid enters the reaction tank after being filtered by the membrane separation mechanism in the filtering form. During backwashing, the blockage in the filter pores is easily flushed out and guided out through the spiral surface of the filter membrane, thereby improving the backwashing effect, thereby improving the treatment efficiency of the fly ash water washing liquid, and solving the technical problem of low treatment efficiency of the fly ash water washing liquid.

[0021] 2. The present invention provides a threaded guide groove so that the filter membrane forms a filtering shape or a backwashing shape instead of a direct pull-up and folding change, so that the deformation of the filter membrane matches the movement trajectory of the corresponding connecting rod B, so that one end of the filter membrane moves spirally along the threaded guide groove relative to the other end, thereby preventing the filter membrane from being torn and damaged during the deformation process, thereby further ensuring the treatment efficiency of the fly ash water washing liquid.

[0022] 3. The present invention also designs the structure of the membrane separation mechanism. During backwashing, the backwashing liquid reversely flushes into the membrane separation mechanism, so that the inner ring drives the outer ring to rotate in the opposite direction through the connecting rod B. At this time, the inner tube can rotate in the opposite direction relative to the outer tube, so that the guide ball block drives the inner tube to rotate through the threaded guide groove, so that the plug-in column moves in the rotating ring groove until the plug-in column is inserted into the plug-in groove, so that the inner tube cannot rotate. The guide ball block moves in the opposite direction in the threaded guide groove, so that the two ends of the filter membrane are relatively far away from each other to form a spiral backwashing shape, so that the filter pore blockage is easily flushed out and guided out through the spiral surface of the filter membrane, and when the guide ball block moves to the tail end of the threaded guide groove, that is, the plug-in groove, the plug-in column is pushed out of the plug-in groove. At this time, the guide ball block drives the inner tube, the horizontal axis assembly and the spiral filter membrane to rotate as a whole, and the movement of the filter membrane relative to the backwashing liquid further makes it easier to flush out the filter pore blockage.

[0023] 4. The present invention further designs the sleeve ring so that when the filter membrane is maintained in a filtering shape with the spiral surfaces contacting each other, the hemispherical block moves along the surface of the shaft body to the limiting ring groove to form a snap connection, so that the filter membrane is maintained in a filtering shape with the spiral surfaces contacting each other, and the flow rate of the fly ash water washing liquid can be controlled according to actual production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the membrane separation mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall structure disassembly of the membrane separation mechanism of the present invention in the filtering form;

[0027] Figure 4 It is a schematic diagram of the overall structure disassembly of the membrane separation mechanism of the present invention in the backwashing state;

[0028] Figure 5 It is a schematic diagram of the filter membrane structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the outer tube and the inner tube of the present invention;

[0030] Figure 7 It is a partial structural cross-sectional schematic diagram of the membrane separation mechanism of the present invention;

[0031] Figure 8 for Figure 7 A schematic diagram of the enlarged structure of part A;

[0032] Fig. 9 It is a schematic diagram of the split structure of the inner tube, the horizontal axis component, the movable component and the filter membrane of the present invention;

[0033] Fig.10 for Fig. 9 An enlarged schematic diagram of the structure of part B.

[0034] Description of the numbers in the figure:

[0035] 1. Reaction tank; 2. Membrane separation mechanism; 3. Inner tube; 4. Horizontal axis assembly; 5. Movable assembly; 6. Filter membrane;

[0036] 21. Outer tube; 22. Flange; 23. One-way rotation groove; 24. Limiting column; 25. Spring A; 26. Slide groove; 27. Slide column; 28. Spring B; 29. ​​Connecting column;

[0037] 31. Thread guide groove; 32. Insertion groove; 33. Rotating ring groove;

[0038] 41. shaft body; 42. connecting rod A; 43. limiting ring groove;

[0039] 51. Inner ring; 52. Outer ring; 53. Connecting rod B; 54. Guide ball block; 55. Ring; 56. Vortex blade; 57. Limiting column groove; 58. Movable column; 59. Spring C; 510. Hemispherical block. DETAILED DESCRIPTION

[0040] like Figures 1 to 10 As shown, the present invention relates to an apparatus and method for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, comprising a reaction tank 1, a calcium carbonate post-processing system is arranged at the output end of the reaction tank 1, the post-processing system comprises a plate and frame separator, a washing tank, a centrifuge, a dryer and a fine grinder arranged in sequence, a membrane separation mechanism 2 is arranged at the input end of the reaction tank 1, the membrane separation mechanism 2 comprises an outer tube 21, the outer tube 21 and the input end of the reaction tank 1 are fixedly installed through a flange 22, an inner tube 3 is movably arranged in the outer tube 21, a transverse axis component 4 is arranged in the inner tube 3, a movable component 5 is movably arranged on the transverse axis component 4, a filter membrane 6 is arranged on the movable component 5, the filter membrane 6 is spiral, and both ends of the filter membrane 6 are respectively fixedly connected to the transverse axis component 4 and the movable component 5.

[0041] Reaction process control: The fly ash water washing liquid is filtered through the membrane separation mechanism 2 in the filtering form, and the fine particles of fly ash, magnesium compounds, macromolecular colloids and other suspended substances in the fly ash water washing liquid are intercepted and enter the reaction tank 1. The agitator and the bottom circulation pump are started to homogenize the fly ash water washing liquid in the reaction tank, so that the materials are fully reacted and then discharged from the reaction tank;

[0042] Plate and frame separation: After the material is discharged from the reaction tank, it enters the plate and frame separator for separation to obtain a solid phase containing calcium carbonate;

[0043] Washing: The separated solid phase is broken up and put into the washing tank, where the solid phase is fully washed to remove the chloride ions;

[0044] Centrifugal separation: The washed material enters the centrifuge for separation to further improve the purity of calcium carbonate;

[0045] Drying: The solid phase obtained after separation enters the dryer for drying.

[0046] Grinding: Use a fine grinder to grind and crush the solid phase obtained after drying to obtain ultrafine calcium carbonate.

[0047] In an embodiment of the present invention, the inner surface of the outer tube 21 is annular and evenly spaced structure with a plurality of one-way rotating grooves 23, the depth of the one-way rotating grooves 23 gradually increases along the counterclockwise direction, and the gap between the one-way rotating grooves 23 and the outer edge surface of the inner tube 3 constitutes a forward limiting cavity, and a limiting column 24 is movably provided in the forward limiting cavity, and both ends of the limiting column 24 are ball head structures, and the limiting column 24 is elastically connected to the forward limiting cavity by a spring A25. Through the above-mentioned arrangement, the present invention enables, in the initial state, the limit column 24 is located in the middle position of the forward limit cavity under the elastic force of the spring A25, and the two ends of the limit column 24 are respectively in contact with the outer surface of the inner tube 3 and the unidirectional rotation groove 23, so that when the inner tube 3 rotates in the reverse direction, the friction force drives the limit column 24 to have a force to move toward the deep part of the forward limit cavity, and the influence of the limit column 24 on the rotation of the inner tube 3 is relatively small. When the inner tube 3 rotates in the forward direction, the friction force drives the limit column 24 to have a force to move toward the shallow part of the forward limit cavity, so that the outer tube 21 locks the inner tube 3 through the limit column 24, so that the inner tube 3 can only rotate in the reverse direction relative to the outer tube 21.

[0048] In an embodiment of the present invention, the inner tube 3 is rotatably disposed in the outer tube 21, and a plurality of thread guide grooves 31 are provided in a ring-shaped evenly spaced structure on the inner surface of the inner tube 3, and a plurality of plug-in grooves 32 are provided on the outer surface of the inner tube 3, and the plurality of plug-in grooves 32 are respectively connected to the plurality of thread guide grooves 31, and the plurality of plug-in grooves 32 are connected through a rotating ring groove 33.

[0049] In an embodiment of the present invention, a plurality of slide grooves 26 are provided on the inner surface of the outer tube 21 in an annular structure with equal spacing relative to the rotating annular groove 33. A slide column 27 is movably connected to the slide groove 26. The slide column 27 is elastically connected to the slide groove 26 through a spring B28. A plug-in column 29 is fixed to the centripetal end of the slide column 27. The plurality of plug-in columns 29 are respectively plugged into the plurality of plug-in grooves 32, and the plug-in column 29 is movably matched with the rotating annular groove 33.

[0050] In an embodiment of the present invention, the transverse axis assembly 4 includes an axis body 41, which is disposed in the inner tube 3. The axis body 41 and the inner tube 3 are fixedly connected by a plurality of connecting rods A42 arranged in a ring-shaped equidistant structure, and a limiting annular groove 43 is provided on the axis body 41.

[0051] In an embodiment of the present invention, the movable component 5 includes an inner ring 51 and an outer ring 52 arranged in an inner and outer structure. The inner ring 51 is sleeved on the shaft body 41. The inner ring 51 and the outer ring 52 are fixedly connected by a plurality of connecting rods B53 arranged in a ring-shaped evenly spaced structure. A plurality of guide ball blocks 54 are movably provided in a ring-shaped evenly spaced structure on the outer ring 52. The plurality of guide ball blocks 54 are movably connected to a plurality of threaded guide grooves 31 respectively, and the guide ball blocks 54 are movably matched with the plug-in column 29.

[0052] In the embodiment of the present invention, the filter membrane 6 is sleeved on the shaft body 41, one end of the filter membrane 6 is fixedly connected to one of the connecting rods A42, and the other end of the filter membrane 6 is fixedly connected to one of the connecting rods B53.

[0053] In the embodiment of the present invention, a collar 55 is fixedly provided at one end of the inner ring 51 away from the connecting rod A42. The collar 55 is movably connected to the shaft body 41. A plurality of vortex blades 56 are fixedly provided on the surface of the collar 55 in an annular structure with equal spacing. Through the above arrangement, the present invention enables the flow of water to cause the vortex blades 56 to drive the collar 55 to rotate, so that the inner ring 51 drives the outer ring 52 to rotate through the connecting rod B53. When the fly ash washing liquid flows rapidly and causes the vortex blades 56 to drive the collar 55 to rotate, since the outer tube 21 fixes the inner tube 3 in one direction through the limiting column 24, the guide ball block 54 moves on the threaded guide groove 31, so that the collar 55 and the inner ring 51 move on the shaft body 41, and the two ends of the filter membrane 6 are relatively close until the spiral surfaces of the filter membrane 6 contact each other. By setting the threaded guide groove 31, the filter membrane 6 forms a filtering shape or a backwashing shape instead of a direct pull-up and folding change, so that the deformation of the filter membrane 6 is consistent with the movement trajectory of the corresponding connecting rod B53, thereby preventing the filter membrane 6 from being torn and damaged during the deformation process, thereby further ensuring the treatment efficiency of the fly ash washing liquid, and during backwashing, the backwashing liquid reversely rushes into the membrane separator The guide ball block 54 drives the inner tube 3, the horizontal axis assembly 4 and the spiral filter membrane 6 to rotate as a whole, and the movement of the filter membrane 6 relative to the backwashing liquid further makes it easier to flush out the blockage in the filter pores.

[0054] In the embodiment of the present invention, a plurality of limiting column grooves 57 are provided in an annular structure with equal spacing on the inner edge surface of the collar 55, and a movable column 58 is movably connected in the limiting column groove 57. The movable column 58 is elastically connected to the limiting column groove 57 through a spring C59, and the movable column 58 is movably connected to the limiting ring groove 43 through a hemispherical block 510. The present invention further designs the collar 55, so that when the filter membrane 6 is maintained in a filtering form in which the spiral surfaces are in contact with each other, the hemispherical block 510 moves along the surface of the shaft body 41 to the limiting ring groove 43 to form a snap connection, so that the filter membrane 6 is maintained in a filtering form in which the spiral surfaces are in contact with each other, and the flow rate of the fly ash washing liquid can be controlled according to actual production needs.

[0055] A method for using a device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, comprising the following steps:

[0056] S1: Filtration of suspended matter in fly ash water wash;

[0057] First, the fly ash washing liquid is made to flow quickly so that the vortex blades 56 drive the collar 55 to rotate, and the inner ring 51 drives the outer ring 52 to rotate through the connecting rod B53. Since the outer tube 21 fixes the inner tube 3 in one direction through the limiting column 24, the guide ball block 54 moves on the threaded guide groove 31, so that the collar 55 and the inner ring 51 move on the shaft body 41, and the two ends of the filter membrane 6 are relatively close until the spiral surfaces of the filter membrane 6 contact each other. At this time, the hemispherical block 510 moves along the surface of the shaft body 41 to the limiting ring groove 43 to form a snap connection, so that the filter membrane 6 maintains a filtering form in which the spiral surfaces contact each other. The flow rate of the fly ash washing liquid can be controlled according to actual production needs. The fly ash washing liquid is filtered by the membrane separation mechanism 2 in the filtering form, and the fine particles of fly ash, magnesium compounds, macromolecular colloids and other suspended matter in the fly ash washing liquid are intercepted and enter the reaction tank 1;

[0058] S2: backwashing of membrane separation mechanism 2;

[0059] First, the backwashing liquid is reversely flushed into the membrane separation mechanism 2, so that the inner ring 51 drives the outer ring 52 to rotate in the opposite direction through the connecting rod B53. At this time, the inner tube 3 can rotate in the opposite direction relative to the outer tube 21, so that the guide ball block 54 drives the inner tube 3 to rotate through the threaded guide groove 31, so that the plug-in column 29 moves in the rotating ring groove 33 until the plug-in column 29 is inserted into the plug-in groove 32, so that the inner tube 3 cannot rotate. The guide ball block 54 moves in the opposite direction in the threaded guide groove 31, so that the two ends of the filter membrane 6 are relatively far away from each other to form a spiral backwashing shape, and the filter pore blockage is easily flushed out and guided out through the spiral surface of the filter membrane 6. When the guide ball block 54 moves to the tail end of the threaded guide groove 31, that is, the plug-in groove 32, the plug-in column 29 is pushed out from the plug-in groove 32. At this time, the guide ball block 54 drives the inner tube 3, the horizontal axis assembly 4 and the spiral filter membrane 6 to rotate as a whole, and the movement of the filter membrane 6 relative to the backwashing liquid further makes it easier to flush out the filter pore blockage.

[0060] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, comprising a reaction tank (1), wherein a membrane separation mechanism (2) is arranged at the input end of the reaction tank (1), characterized in that: The membrane separation mechanism (2) comprises an outer tube (21), the outer tube (21) and the input end of the reaction tank (1) are fixedly mounted via a flange (22), an inner tube (3) is movably arranged inside the outer tube (21), a transverse axis component (4) is arranged inside the inner tube (3), a movable component (5) is movably arranged on the transverse axis component (4), a filter membrane (6) is arranged on the movable component (5), the filter membrane (6) is spiral-shaped, and two ends of the filter membrane (6) are respectively fixedly connected to the transverse axis component (4) and the movable component (5); The inner surface of the inner tube (3) is provided with a plurality of thread guide grooves (31) in an annular structure with equal spacing; The transverse axis assembly (4) comprises an axis body (41), the axis body (41) being arranged in the inner tube (3), the axis body (41) being fixedly connected to the inner tube (3) via a plurality of connecting rods A (42) arranged in an annular structure with equal spacing; The movable component (5) comprises an inner ring (51) and an outer ring (52) arranged in an inner-outer structure, the inner ring (51) is sleeved on the shaft body (41), the inner ring (51) and the outer ring (52) are fixedly connected via a plurality of connecting rods B (53) arranged in an annular structure with equal spacing, and a plurality of guide ball blocks (54) are movably provided on the outer ring (52) in an annular structure with equal spacing, and the plurality of guide ball blocks (54) are movably connected to the plurality of threaded guide grooves (31) respectively; The filter membrane (6) is sleeved on the shaft (41), one end of the filter membrane (6) is fixedly connected to one of the connecting rods A (42), and the other end of the filter membrane (6) is fixedly connected to one of the connecting rods B (53); A collar (55) is fixedly provided at one end of the inner ring (51) away from the connecting rod A (42), the collar (55) being movably connected to the shaft body (41), and a plurality of vortex blades (56) are fixedly provided on the surface of the collar (55) in an annular structure with equal spacing.

2. The equipment for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology according to claim 1, characterized in that: The inner surface of the outer tube (21) is provided with a plurality of one-way rotation grooves (23) in an annular structure with equal spacing. The depth of the one-way rotation grooves (23) gradually increases in the counterclockwise direction. The gap between the one-way rotation grooves (23) and the outer edge surface of the inner tube (3) forms a forward limiting cavity. A limiting column (24) is movably provided in the forward limiting cavity. Both ends of the limiting column (24) are ball head structures. The limiting column (24) and the forward limiting cavity are elastically connected via a spring A (25).

3. The device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology according to claim 2, characterized in that: The inner tube (3) is rotatably arranged in the outer tube (21), and a plurality of insertion grooves (32) are provided on the outer surface of the inner tube (3). The plurality of insertion grooves (32) are respectively connected to the plurality of thread guide grooves (31), and the plurality of insertion grooves (32) are connected via a rotating ring groove (33).

4. The equipment for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology according to claim 3, characterized in that: The inner surface of the outer tube (21) is provided with a plurality of slide grooves (26) in an annular structure with equal spacing relative to the rotating annular groove (33). A slide column (27) is movably connected to the slide groove (26). The slide column (27) and the slide groove (26) are elastically connected via a spring B (28). A plug-in column (29) is fixed to the centripetal end of the slide column (27). The plurality of plug-in columns (29) are respectively plugged into the plurality of plug-in grooves (32). The plug-in column (29) is movably matched with the rotating annular groove (33), and the guide ball block (54) is movably matched with the plug-in column (29).

5. The equipment for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology according to claim 4, characterized in that: A limiting annular groove (43) is provided on the shaft body (41).

6. The equipment for preparing ultrafine calcium carbonate from fly ash washing liquid based on membrane separation technology according to claim 5, characterized in that: A plurality of limiting column grooves (57) are formed in an annular structure with equal spacing on the inner edge surface of the collar (55), and a movable column (58) is movably connected in the limiting column groove (57). The movable column (58) is elastically connected to the limiting column groove (57) via a spring C (59), and the movable column (58) is movably connected to the limiting ring groove (43) via a hemispherical block (510).

7. A method for using a device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology, which is applicable to the device for preparing ultrafine calcium carbonate from fly ash water washing liquid based on membrane separation technology as claimed in claim 6, characterized in that: The following steps are involved: S1: Filtration of suspended matter in fly ash water wash; First, the fly ash washing liquid is made to flow rapidly so that the vortex blades (56) drive the collar (55) to rotate, so that the inner ring (51) drives the outer ring (52) to rotate through the connecting rod B (53). Since the outer tube (21) is fixed to the inner tube (3) in one direction through the limiting column (24), the guide ball block (54) moves on the threaded guide groove (31), so that the collar (55) and the inner ring (51) move on the shaft (41), and the two ends of the filter membrane (6) are relatively close to each other until the filter membrane (6) is moved. ) the spiral surfaces are in contact with each other, at which time the hemispherical block (510) moves along the surface of the shaft body (41) to the limiting ring groove (43) to form a snap connection, so that the filter membrane (6) is maintained in a filtering form in which the spiral surfaces are in contact with each other. The flow rate of the fly ash water washing liquid can be controlled according to actual production needs. The fly ash water washing liquid is filtered by the membrane separation mechanism (2) in the filtering form, and suspended matter such as fine particles of fly ash, magnesium compounds, and macromolecular colloids in the fly ash water washing liquid is intercepted and enters the reaction tank (1); S2: backwashing of the membrane separation mechanism (2); First, the backwashing liquid is reversely flushed into the membrane separation mechanism (2), so that the inner ring (51) drives the outer ring (52) to rotate in the opposite direction through the connecting rod B (53). At this time, the inner tube (3) can rotate in the opposite direction relative to the outer tube (21), so that the guide ball block (54) drives the inner tube (3) to rotate through the threaded guide groove (31), so that the plug-in column (29) moves in the rotating ring groove (33) until the plug-in column (29) is inserted into the plug-in groove (32), so that the inner tube (3) cannot rotate, and the guide ball block (54) moves in the opposite direction in the threaded guide groove (31). The two ends of the filter membrane (6) are relatively far apart to form a spiral backwashing shape, and the filter hole blockage is easily flushed out and guided out through the spiral surface of the filter membrane (6). When the guide ball block (54) moves to the tail end of the threaded guide groove (31), that is, the plug-in groove (32), the plug-in column (29) is pushed out from the plug-in groove (32). At this time, the guide ball block (54) drives the inner tube (3), the horizontal axis component (4) and the spiral filter membrane (6) to rotate as a whole. The movement of the filter membrane (6) relative to the backwashing liquid further makes it easier to flush out the filter hole blockage.

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