Segmented crystallization system for high-salinity wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a high-salinity wastewater sectional crystallization system which comprises a first filter, the first filter comprises a filter box, a liquid outlet and a liquid inlet are formed in the filter box, a filter screen is installed in the filter box, a motor is installed at the bottom of the filter box, and the output end of the motor is connected with a transmission rod; the transmission rod is connected with the cleaning assembly; the cleaning assembly comprises a sliding box, a sliding table is slidably installed on the sliding box, a sliding roller and a cleaning cylinder are installed on the sliding table, a corrugated ring is installed on the inner wall of the filter box, the sliding roller is in sliding fit with the corrugated ring, and an arc-shaped brush plate is installed on the cleaning cylinder; the motor drives the transmission rod and the supporting rod to rotate, the supporting rod drives the sliding box to rotate along the filter screen, under sliding fit of the sliding roller and the corrugated ring, the brushes on the arc-shaped brush plate are inserted into holes of the filter screen, crystal substances are flushed out of the holes of the filter screen, and cleaning of the holes of the filter screen is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-salt wastewater segmented crystallization system. Background Art

[0002] High-salinity wastewater is generated during industrial production. This wastewater undergoes staged evaporation, crystallization, and filtration to produce sodium carbonate, a mixed salt of sodium bicarbonate (trona), sodium nitrate, and sodium acetate. The specific process is as follows: the high-salinity wastewater is first passed through a cooling crystallizer to precipitate crystals. A filter then separates the crystals from the mother liquor. The mother liquor is then adsorbed on activated carbon and passed back into the cooling crystallizer. These steps are repeated to precipitate sodium carbonate, a mixed salt of sodium bicarbonate (trona), sodium nitrate, and sodium acetate from the mother liquor.

[0003] During the solid-liquid separation process of the mother liquor, both the outer surface and the pores of the filter can become clogged. For example, larger solid crystals are more likely to clog the outer surface of the filter, while smaller solid crystals are more likely to clog the pores. Existing methods for cleaning filter screens often use brushes, such as those described in patent publication number CN217220408U. However, this method only cleans the outer surface of the filter, and crystals clogged in the pores of the filter are difficult to remove. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-salt wastewater segmented crystallization system to address the shortcomings of the existing technology and solve the technical problems in the existing technology.

[0005] The object of the present invention can be achieved through the following technical scheme: a high-salt wastewater segmented crystallization system, which includes a cooling crystallization kettle, the cooling crystallization kettle is connected to a low-temperature evaporator through filter one and activated carbon, the low-temperature evaporator is connected to crystallization kettle one through filter two, crystallization kettle one is connected to evaporator one through filter three, evaporator one is connected to crystallization kettle two through filter four, and crystallization kettle two is connected to evaporator one through filter five; the filter one includes a filter box, a drain port and a liquid inlet are respectively provided on the filter box, a filter screen is installed in the filter box, a motor is installed at the bottom of the filter box, the output end of the motor is connected to a transmission rod, and the transmission rod is connected to a cleaning component through a support rod; the cleaning component includes a slide box, a slide table is slidably installed on the slide box, a sliding roller and a cleaning cylinder are respectively installed on the slide table, a corrugated ring is installed on the inner wall of the filter box, the sliding roller and the corrugated ring are slidably matched, and an arc brush plate is installed on the cleaning cylinder; the transmission rod and the support rod are driven by the motor to rotate, and the support rod drives the slide box to rotate along the filter screen, and under the sliding cooperation of the sliding roller and the corrugated ring, the brush on the arc brush plate is inserted into the pores of the filter screen; The system uses a high-salt wastewater segmented crystallization method, which includes the following steps: Step S1: Passing high-salt wastewater into a cooling crystallization kettle for cooling and crystallization, so that sodium carbonate and sodium bicarbonate in the high-salt wastewater are crystallized and precipitated, then passing the mother liquor from the liquid inlet into filter 1, filtered through the filter screen and discharged from the liquid outlet, the filtered mother liquor is adsorbed by activated carbon and then transported to a low-temperature evaporator; Step S2: The mother liquor is evaporated and concentrated in the low-temperature evaporator in the first stage to crystallize sodium nitrate. After the slurry is separated into solid and liquid by filter 2, the mother liquor is passed into crystallization kettle 1; Step S3: Sodium acetate crystallizes out of the mother liquor in the crystallization kettle 1, and after the crystal slurry is separated into solid and liquid by filter 3, the mother liquor is passed into evaporator 1, and the mother liquor undergoes a second stage of evaporation and concentration in evaporator 1 to crystallize sodium nitrate. After the crystal slurry is separated into solid and liquid by filter 4, the mother liquor is passed into crystallization kettle 2; sodium acetate crystallizes out in crystallization kettle 2; after the crystal slurry is separated into solid and liquid by filter 5, the mother liquor is refluxed into evaporator 1.

[0006] As a further optimization or improvement of this solution, step S1 specifically includes the following steps: Step S11: The motor is running, and the motor rotates through the transmission rod and the support rod. The support rod drives the slide box to rotate along the filter screen. Under the action of the sliding roller and the corrugated ring, the cleaning cylinder moves closer to the filter screen. Step S12: When the cleaning cylinder moves closer to the filter, the slide at the bottom of the cleaning cylinder slides along the horizontal slide groove in the slide box, and spring 1 is compressed. At the same time, the upper slider on the top slide slides in the upper slide groove and compresses spring 2, so that the brush on the arc-shaped brush plate is inserted into the pores of the filter to flush out the crystals from the pores of the filter.

[0007] As a further optimization or improvement of this solution, a lower slider is installed at the bottom of the slide, strip sliders are installed on both sides of the lower slider, a horizontal slide groove is opened in the slide box, the strip slider slides with the horizontal slide groove, and the inner wall of the slide box is connected to the lower slider through a spring.

[0008] As a further optimization or improvement of this solution, an annular groove is installed in the filter box, a top plate is slidably installed in the annular groove, an upper slider is installed on the slide, an upper slide groove is opened in the top plate, the upper slider slides in the upper slide groove, and the upper slider is connected to the inner wall of the upper slide groove through spring 2.

[0009] As a further optimization or improvement of this solution, a convex roller is rotatably installed in the cleaning cylinder, the convex roller is coaxially connected to the gear, a rack is installed at the bottom of the slide box, and the gear is meshed with the rack.

[0010] As a further optimization or improvement of this solution, a resettable arc-shaped brush plate is installed on the cleaning cylinder, and a convex surface is provided on the arc-shaped brush plate, and the convex roller lifts the arc-shaped brush plate through the convex surface.

[0011] As a further optimization or improvement of this solution, the convex roller is embedded with a magnetic block 1, a reset groove is provided in the arc-shaped brush plate, a magnetic block 2 is slidably installed in the reset groove, a striker is installed on the magnetic block 2, a resonance plate is installed in the inner cavity of the arc-shaped brush plate, the striker strikes the resonance plate, and the magnetic block 1 and the magnetic block 2 repel each other.

[0012] As a further optimization or improvement of this solution, a folding plate is installed on the sliding box, the folding plate is connected to the lower sliding block, and a base is installed at the bottom of the filter box.

[0013] Beneficial effects of the present invention: (1) When the pores of the filter screen inside the filter 1 are clogged, the motor starts to run, and the motor rotates through the transmission rod and the support rod. The support rod drives the slide box to rotate along the filter screen. Under the action of the sliding roller and the corrugated ring, the cleaning cylinder moves closer to the filter screen. The slide at the bottom of the cleaning cylinder slides along the horizontal slide groove in the slide box. The spring 1 is compressed, so that the brush on the arc-shaped brush plate is inserted into the pores of the filter screen, and the crystals are flushed out of the pores of the filter screen, thereby cleaning the pores of the filter screen.

[0014] (2) When the lower slider of the present invention slides in the slide box, the cleaning cylinder moves toward the filter screen. When the brush on the arc-shaped brush plate is inserted into the pores of the filter screen, the gear and the rack engage. As the brush on the arc-shaped brush plate extends into the pores of the filter screen, the gear rotates, and the gear drives the convex roller to rotate synchronously. As the convex roller continues to rotate, the convex roller intermittently lifts the arc-shaped brush plate, so that the brush on the arc-shaped brush plate continuously impacts the thickened crystals in the pores of the filter screen along the pores, thereby increasing the cleaning force of the crystals and removing the thickened crystals.

[0015] (3) When the convex part of the convex roller approaches the arc-shaped brush plate, under the action of the repulsion between magnetic block 1 and magnetic block 2, magnetic block 2 slides along the reset groove, causing the striker on magnetic block 2 to strike the resonance plate, causing the resonance plate to vibrate. The vibration is transmitted to the brush on the arc-shaped brush plate through the resonance plate, causing the brush to vibrate in the pores, so that the brush cleans the scale in the pores, ensuring the pore size of the filter screen, and avoiding the increase of internal pressure of filter 1 due to the reduction of pores. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is the overall structural process diagram of the present invention.

[0018] Figure 2 Schematic diagram of the overall structure of the filter.

[0019] Figure 3 It is a cross-sectional view of the overall structure of the filter.

[0020] Figure 4 Schematic diagram of the internal structure of filter 1.

[0021] Figure 5 This is the matching diagram of the sliding roller and the corrugated ring.

[0022] Figure 6 Schematic diagram of the sliding box structure.

[0023] Figure 7 Schematic diagram of the connection between slide boxes.

[0024] Figure 8 This is the diagram of the slide box and the lower slider.

[0025] Figure 9 Schematic diagram of the internal structure of the cleaning cylinder.

[0026] Figure 10 Schematic diagram of the convex roller structure.

[0027] Figure 11 Schematic diagram of the internal structure of the curved brush plate.

[0028] The following are marked in the figure: 1. Cooling crystallization kettle; 2. Filter 1; 201. Filter box; 202. Drain port; 203. Liquid inlet; 204. Base; 205. Motor; 206. Filter screen; 207. Transmission rod; 208. Support rod; 209. Ring groove; 3. Activated carbon; 4. Low-temperature evaporator; 5. Cleaning assembly; 501. Slide box; 502. Folding plate; 503. Spring 1; 504. Rack; 505. Horizontal slide; 506. Gear; 507. Lower slide; 508. Strip slide ; 509, slide; 510, cleaning cylinder; 511, slide roller; 512, top plate; 513, upper slide; 514, spring two; 515, upper slider; 516, convex roller; 517, arc-shaped brush plate; 518, magnetic block one; 519, magnetic block two; 520, resonance plate; 521, striker; 522, reset slide; 6, corrugated ring; 7, filter two; 8, crystallization kettle one; 9, filter three; 10, evaporator one; 11, filter four; 12, crystallization kettle two; 13, filter five. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figures 1-8A high-salt wastewater segmented crystallization system includes a cooling crystallization kettle 1, the cooling crystallization kettle 1 is connected to a low-temperature evaporator 4 through a filter 2 and activated carbon 3, the low-temperature evaporator 4 is connected to a crystallization kettle 8 through a filter 2 7, the crystallization kettle 8 is connected to an evaporator 10 through a filter 3 9, the evaporator 10 is connected to a crystallization kettle 2 12 through a filter 4 11, and the crystallization kettle 2 12 is connected to an evaporator 10 through a filter 5 13; the filter 2 includes a filter box 201, a drain port 202 and a liquid inlet 203 are respectively provided on the filter box 201, a filter screen 206 is installed in the filter box 201, a motor 205 is installed at the bottom of the filter box 201, and the motor 205 outputs The output end is connected to the transmission rod 207, and the transmission rod 207 is connected to the cleaning assembly 5 through the support rod 208; the cleaning assembly 5 includes a slide box 501, a slide table 509 is slidably installed on the slide box 501, and a sliding roller 511 and a cleaning cylinder 510 are respectively installed on the slide table 509. A corrugated ring 6 is installed on the inner wall of the filter box 201, and the sliding roller 511 slides with the corrugated ring 6. An arc-shaped brush plate 517 is installed on the cleaning cylinder 510; the transmission rod 207 and the support rod 208 are driven to rotate by the motor 205, and the support rod 208 drives the slide box 501 to rotate along the filter screen 206. Under the sliding cooperation of the sliding roller 511 and the corrugated ring 6, the brush on the arc-shaped brush plate 517 is inserted into the pores of the filter screen 206; The system uses a high-salt wastewater segmented crystallization method, which includes the following steps: Step S1: Passing high-salt wastewater into a cooling crystallization kettle 1 for cooling and crystallization, so that sodium carbonate and sodium bicarbonate in the high-salt wastewater are crystallized and precipitated, then passing the mother liquor from the liquid inlet 203 into the filter 2, filtered through the filter 206 and discharged from the drain port 202, the filtered mother liquor is adsorbed by the activated carbon 3 and then transported to the low-temperature evaporator 4; Step S2: The mother liquor is evaporated and concentrated in the low-temperature evaporator 4 to crystallize sodium nitrate. After the slurry is separated into solid and liquid by the filter 7, the mother liquor is passed into the crystallization kettle 8; Step S3: Sodium acetate crystallizes out of the mother liquor in the crystallization kettle 8. After the crystal slurry is separated into solid and liquid through the filter 3 9, the mother liquor is passed into the evaporator 10. The mother liquor undergoes a second stage of evaporation and concentration in the evaporator 10 to crystallize sodium nitrate. After the crystal slurry is separated into solid and liquid through the filter 4 11, the mother liquor is passed into the crystallization kettle 2 12; sodium acetate crystallizes out in the crystallization kettle 2 12; after the crystal slurry is separated into solid and liquid through the filter 5 13, the mother liquor is refluxed into the evaporator 10.

[0031] Specifically, a lower slider 507 is installed at the bottom of the slide 509, and strip sliders 508 are installed on both sides of the lower slider 507. A horizontal slide groove 505 is opened in the slide box 501, and the strip slider 508 slides with the horizontal slide groove 505. The inner wall of the slide box 501 is connected to the lower slider 507 through a spring 503.

[0032] Specifically, an annular groove 209 is installed in the filter box 201, a top plate 512 is slidably installed in the annular groove 209, an upper slider 515 is installed on the slide 509, an upper slide groove 513 is opened in the top plate 512, the upper slider 515 is located in the upper slide groove 513 and slides, and the upper slider 515 is connected to the inner wall of the upper slide groove 513 through a spring 2 514.

[0033] It should be noted that, through the above process, Filter 1 2, Filter 2 7, Filter 3 9, Filter 4 11, and Filter 5 13 are capable of separating sodium carbonate, sodium bicarbonate mixed salt (trona), sodium nitrate, and sodium acetate from high-salinity wastewater, respectively. Filter 1 2, Filter 2 7, Filter 3 9, Filter 4 11, and Filter 5 13 are filters of the same specifications; cooling crystallization kettle 1, Crystallization kettle 1 8, and Crystallization kettle 2 12 are crystallization kettles of the same specifications; low-temperature evaporator 4 and evaporator 10 are evaporators of the same specifications.

[0034] It should be noted that when the filter 2 is in use, the mother liquid to be filtered is connected to the liquid inlet 203, and the mother liquid is filtered through the filter 206 and then discharged from the liquid outlet 202.

[0035] When the pores of the filter screen 206 inside the filter 2 are clogged, the motor 205 runs, and the motor 205 rotates through the transmission rod 207 and the support rod 208, and the support rod 208 drives the slide box 501 to rotate along the filter screen 206. Under the action of the sliding roller 511 and the corrugated ring 6, the cleaning cylinder 510 moves close to the filter screen 206, and the slide 509 at the bottom of the cleaning cylinder 510 slides along the horizontal slide groove 505 in the slide box 501, and the spring 1 503 is compressed. At the same time, the upper slider 515 on the top slide 509 slides in the upper slide groove 513 and compresses the spring 2 514, so that the brush on the arc brush plate 517 is inserted into the pores of the filter screen 206, and the crystals are flushed out from the pores of the filter screen 206, thereby cleaning the pores of the filter screen 206.

[0036] See also Figure 2-Figure 9 , the step S1 specifically includes the following steps: Step S11: The motor 205 is running, and the motor 205 rotates through the transmission rod 207 and the support rod 208. The support rod 208 drives the slide box 501 to rotate along the filter screen 206. Under the action of the sliding roller 511 and the corrugated ring 6, the cleaning cylinder 510 moves toward the filter screen 206. Step S12: When the cleaning cylinder 510 moves closer to the filter 206, the slide 509 at the bottom of the cleaning cylinder 510 slides along the horizontal slide 505 in the slide box 501, and the spring 1 503 is compressed. At the same time, the upper slider 515 on the top slide 509 slides in the upper slide 513 and compresses the spring 2 514, so that the brush on the arc-shaped brush plate 517 is inserted into the pores of the filter 206, flushing the crystals out of the pores of the filter 206.

[0037] See also Figures 6-11 A convex roller 516 is rotatably installed in the cleaning cylinder 510, and the convex roller 516 is coaxially connected to the gear 506. A rack 504 is installed at the bottom of the sliding box 501, and the gear 506 is engaged with the rack 504.

[0038] Specifically, a resettable arc-shaped brush plate 517 is installed on the cleaning cylinder 510 , and a convex surface is provided on the arc-shaped brush plate 517 , and the convex roller 516 lifts the arc-shaped brush plate 517 through the convex surface.

[0039] Specifically, the convex roller 516 is embedded with a magnetic block 1 518, a reset groove 522 is provided in the arc-shaped brush plate 517, a magnetic block 2 519 is slidably installed in the reset groove 522, a striker 521 is installed on the magnetic block 2 519, a resonance plate 520 is installed in the inner cavity of the arc-shaped brush plate 517, the striker 521 strikes the resonance plate 520, and the magnetic block 1 518 and the magnetic block 2 519 repel each other.

[0040] It should be noted that after the mother liquor is passed from the cooling crystallization kettle 1 into the filter 2, the pressure and temperature of the mother liquor remain basically unchanged. Therefore, the mother liquor may continue to crystallize in the filter 2, causing the crystals blocked inside the pores to continue to crystallize, resulting in the crystals thickening and crystallizing along the inner wall of the pores. The thickening of the crystals will increase the difficulty of cleaning, and the crystallization of the inner wall of the pores will cause the pores to decrease.

[0041] Therefore, when the lower slider 507 of the present invention slides in the sliding box 501, the cleaning cylinder 510 moves toward the filter screen 206. When the brush on the arc-shaped brush plate 517 is inserted into the pores of the filter screen 206, the cleaning cylinder 510 moves toward the filter screen 206. Figure 7 The gear 506 is meshed with the rack 504. As the brush on the arc-shaped brush plate 517 extends into the pores of the filter screen 206, the gear 506 rotates, and the gear 506 drives the convex roller 516 to rotate synchronously. As the convex roller 516 continues to rotate, the convex roller 516 intermittently lifts the arc-shaped brush plate 517, so that the brush on the arc-shaped brush plate 517 continuously impacts the thickened crystals in the pores of the filter screen 206 along the pores, thereby increasing the cleaning force of the crystals and removing the thickened crystals.

[0042] For details, see Figure 10-11 When the convex portion of the convex roller 516 approaches the arc-shaped brush plate 517, under the repulsive effect of the magnetic block 1 518 and the magnetic block 2 519, the magnetic block 2 519 slides along the reset chute 522, causing the striker 521 on the magnetic block 2 519 to strike the resonance plate 520, causing the resonance plate 520 to vibrate. The vibration is transmitted to the brush on the arc-shaped brush plate 517 through the resonance plate 520, causing the brush to vibrate in the pores, so that the brush cleans the scale in the pores, ensuring the pore size of the filter 206, and avoiding the increase of the internal pressure of the filter 2 due to the reduction of the pores.

[0043] See also Figure 2 and Figure 8 A folding plate 502 is installed on the sliding box 501, and the folding plate 502 is connected to the lower sliding block 507. A base 204 is installed at the bottom of the filter box 201.

[0044] It should be noted that the purpose of the folding plate 502 is to protect the internal structure of the slide box 501 and prevent the mother liquid from corroding.

[0045] The working principle of the present invention is as follows: when the filter 2 is in use, the mother liquid to be filtered is connected to the liquid inlet 203, and the mother liquid is filtered through the filter 206 and then discharged from the liquid outlet 202.

[0046] When the pores of the filter screen 206 inside the filter 2 are clogged, the motor 205 runs, and the motor 205 rotates through the transmission rod 207 and the support rod 208, and the support rod 208 drives the slide box 501 to rotate along the filter screen 206. Under the action of the sliding roller 511 and the corrugated ring 6, the cleaning cylinder 510 moves close to the filter screen 206, and the slide 509 at the bottom of the cleaning cylinder 510 slides along the horizontal slide groove 505 in the slide box 501, and the spring 1 503 is compressed. At the same time, the upper slider 515 on the top slide 509 slides in the upper slide groove 513 and compresses the spring 2 514, so that the brush on the arc brush plate 517 is inserted into the pores of the filter screen 206, and the crystals are flushed out from the pores of the filter screen 206, thereby cleaning the pores of the filter screen 206.

[0047] It should be noted that after the mother liquor is passed from the cooling crystallization kettle 1 into the filter 2, the pressure and temperature of the mother liquor remain basically unchanged. Therefore, the mother liquor may continue to crystallize in the filter 2, causing the crystals blocked inside the pores to continue to crystallize, resulting in the crystals thickening and crystallizing along the inner wall of the pores. The thickening of the crystals will increase the difficulty of cleaning, and the crystallization of the inner wall of the pores will cause the pores to decrease.

[0048] Therefore, when the lower slider 507 of the present invention slides in the sliding box 501, the cleaning cylinder 510 moves toward the filter screen 206. When the brush on the arc-shaped brush plate 517 is inserted into the pores of the filter screen 206, the cleaning cylinder 510 moves toward the filter screen 206. Figure 7 The gear 506 is meshed with the rack 504. As the brush on the arc-shaped brush plate 517 extends into the pores of the filter screen 206, the gear 506 rotates, and the gear 506 drives the convex roller 516 to rotate synchronously. As the convex roller 516 continues to rotate, the convex roller 516 intermittently lifts the arc-shaped brush plate 517, so that the brush on the arc-shaped brush plate 517 continuously impacts the thickened crystals in the pores of the filter screen 206 along the pores, thereby increasing the cleaning force of the crystals and removing the thickened crystals.

[0049] For details, see Figure 10-11When the convex portion of the convex roller 516 approaches the arc-shaped brush plate 517, under the repulsive effect of the magnetic block 1 518 and the magnetic block 2 519, the magnetic block 2 519 slides along the reset chute 522, causing the striker 521 on the magnetic block 2 519 to strike the resonance plate 520, causing the resonance plate 520 to vibrate. The vibration is transmitted to the brush on the arc-shaped brush plate 517 through the resonance plate 520, causing the brush to vibrate in the pores, so that the brush cleans the scale in the pores, ensuring the pore size of the filter 206, and avoiding the increase of the internal pressure of the filter 2 due to the reduction of the pores.

[0050] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A high-salt wastewater segmented crystallization system, characterized in that: The invention comprises a cooling crystallization kettle (1), wherein the cooling crystallization kettle (1) is connected to a low-temperature evaporator (4) via a filter (2) and activated carbon (3), the low-temperature evaporator (4) is connected to a crystallization kettle (8) via a filter (7), the crystallization kettle (8) is connected to an evaporator (10) via a filter (9), the evaporator (10) is connected to a crystallization kettle (2) (12) via a filter (11), and the crystallization kettle (12) is connected to an evaporator (10) via a filter (13); The filter 1 (2) comprises a filter box (201), a liquid discharge port (202) and a liquid inlet (203) are respectively provided on the filter box (201), a filter screen (206) is installed in the filter box (201), a motor (205) is installed at the bottom of the filter box (201), an output end of the motor (205) is connected to a transmission rod (207), and the transmission rod (207) is connected to the cleaning component (5) via a support rod (208); The cleaning assembly (5) comprises a sliding box (501), a sliding platform (509) is slidably mounted on the sliding box (501), a sliding roller (511) and a cleaning cylinder (510) are respectively mounted on the sliding platform (509), a corrugated ring (6) is mounted on the inner wall of the filter box (201), the sliding roller (511) and the corrugated ring (6) are slidably matched, and an arc-shaped brush plate (517) is mounted on the cleaning cylinder (510); The motor (205) drives the transmission rod (207) and the support rod (208) to rotate, and the support rod (208) drives the slide box (501) to rotate along the filter screen (206). Under the sliding cooperation between the sliding roller (511) and the corrugated ring (6), the brush on the arc-shaped brush plate (517) is inserted into the pores of the filter screen (206); The system uses a high-salt wastewater segmented crystallization method, which includes the following steps: Step S1: passing high-salt wastewater into a cooling crystallization kettle (1) for cooling and crystallization, so that sodium carbonate and sodium bicarbonate in the high-salt wastewater are crystallized and precipitated, and then the mother liquor is passed through the liquid inlet (203) into the filter 1 (2), filtered through the filter (206) and discharged from the liquid outlet (202), and the filtered mother liquor is adsorbed by activated carbon (3) and then transported to the low-temperature evaporator (4); Step S2: The mother liquor is evaporated and concentrated in the low-temperature evaporator (4) to crystallize sodium nitrate. After the slurry is separated into solid and liquid by the second filter (7), the mother liquor is passed into the first crystallization kettle (8); Step S3: Sodium acetate crystallizes out from the mother liquor in the crystallization kettle 1 (8). After the crystal slurry is separated from the solid and liquid by the filter 3 (9), the mother liquor is passed into the evaporator 1 (10). The mother liquor undergoes a second stage of evaporation and concentration in the evaporator 1 (10) to crystallize out sodium nitrate. After the crystal slurry is separated from the solid and liquid by the filter 4 (11), the mother liquor is passed into the crystallization kettle 2 (12); sodium acetate crystallizes out in the crystallization kettle 2 (12); after the crystal slurry is separated from the solid and liquid by the filter 5 (13), the mother liquor is refluxed into the evaporator 1 (10).

2. A high-salt wastewater segmented crystallization system according to claim 1, characterized in that: The step S1 specifically includes the following steps: Step S11: The motor (205) is running, and the motor (205) rotates through the transmission rod (207) and the support rod (208). The support rod (208) drives the slide box (501) to rotate along the filter screen (206). Under the action of the sliding roller (511) and the corrugated ring (6), the cleaning cylinder (510) moves toward the filter screen (206); Step S12: When the cleaning cylinder (510) moves closer to the filter (206), the slide (509) at the bottom of the cleaning cylinder (510) slides along the horizontal slide groove (505) in the slide box (501), and the spring 1 (503) is compressed. At the same time, the upper slider (515) on the top slide (509) slides in the upper slide groove (513) and compresses the spring 2 (514), so that the brush on the arc-shaped brush plate (517) is inserted into the pores of the filter (206), and the crystals are flushed out of the pores of the filter (206).

3. The high-salt wastewater segmented crystallization system according to claim 1, characterized in that: A lower slider (507) is installed at the bottom of the slide (509), and strip sliders (508) are installed on both sides of the lower slider (507). A transverse slide groove (505) is opened in the slide box (501), and the strip slider (508) slides with the transverse slide groove (505). The inner wall of the slide box (501) is connected to the lower slider (507) through a spring (503).

4. A high-salt wastewater segmented crystallization system according to claim 3, characterized in that: An annular groove (209) is installed in the filter box (201), a top plate (512) is slidably installed in the annular groove (209), an upper slider (515) is installed on the slide (509), an upper slide groove (513) is provided in the top plate (512), the upper slider (515) is located in the upper slide groove (513) and slides, and the upper slider (515) is connected to the inner wall of the upper slide groove (513) through a second spring (514).

5. A high-salt wastewater segmented crystallization system according to claim 4, characterized in that: A convex roller (516) is rotatably installed in the cleaning cylinder (510), and the convex roller (516) is coaxially connected to the gear (506). A rack (504) is installed at the bottom of the sliding box (501), and the gear (506) is meshed with the rack (504).

6. A high-salt wastewater segmented crystallization system according to claim 5, characterized in that: The cleaning cylinder (510) is provided with a resetting arc-shaped brush plate (517), the arc-shaped brush plate (517) having a convex surface, and the convex roller (516) lifts the arc-shaped brush plate (517) via the convex surface.

7. A high-salt wastewater segmented crystallization system according to claim 6, characterized in that: The convex roller (516) is embedded with a magnetic block 1 (518), a reset chute (522) is provided in the arc-shaped brush plate (517), a magnetic block 2 (519) is slidably installed in the reset chute (522), a striker (521) is installed on the magnetic block 2 (519), a resonance plate (520) is installed in the inner cavity of the arc-shaped brush plate (517), and the striker (521) strikes the resonance plate (520), and the magnetic block 1 (518) and the magnetic block 2 (519) repel each other.

8. A high-salt wastewater segmented crystallization system according to claim 7, characterized in that: A folding plate (502) is installed on the sliding box (501), and the folding plate (502) is connected to the lower sliding block (507). A base (204) is installed at the bottom of the filter box (201).

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