Salt extraction device for coking wastewater

Abstract

The salt extraction device comprises a heating box, a crystallizing box, a purifying box, a heating mechanism, a cleaning mechanism, a first driving mechanism and a collecting mechanism, a water inlet pipe is fixedly arranged on the crystallizing box, an air inlet pipe is fixedly arranged between the crystallizing box and the purifying box, and an air outlet pipe is fixedly arranged at the bottom end of the purifying box; the heating mechanism comprises a plurality of heating plates and a metal plate, the metal plate is fixedly arranged in the heating box, the sweeping mechanism comprises a stirring rod, a plurality of first pressing assemblies, a plurality of second pressing assemblies and a brush plate, the stirring rod penetrates through the crystallization box and is rotationally connected with the crystallization box, and each first pressing assembly comprises a first fixing rod, a telescopic rod and a first spring; the telescopic rod comprises a sleeve and an adjusting rod, the other end of the adjusting rod is fixedly arranged on the brush plate, the first spring is arranged in the sleeve and between the sleeve and the adjusting rod and fixed to the sleeve and the adjusting rod, and brush bristles are fixedly arranged on the brush plate. The technical problem that salt collection is affected due to the fact that salt easily crystallizes on the inner wall is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of coking wastewater treatment, and in particular relates to a salt extraction device for coking wastewater. Background Art

[0002] Coking wastewater has always been one of the difficulties in wastewater treatment in the metallurgical industry. With the continuous development of biochemical treatment technology for coking wastewater in recent years, the treated coking wastewater has reached the national first-level emission standards in terms of pollutant indicators such as COD and NH3-N, but it still cannot meet the reuse standards because the wastewater contains a large amount of salt. Long-term use will cause pipeline corrosion and scaling, and even damage the equipment. In addition, in order to save resources and reduce costs, it is also necessary to recycle the salt in the coking wastewater. Therefore, it is imperative to extract the salt in the coking wastewater.

[0003] At present, the existing salt extraction devices for coking wastewater basically adopt evaporation treatment of wastewater, in which the salt-containing water is evaporated in the reaction vessel to extract salt crystals. During the evaporation extraction process, some salt crystals will adhere to the inner wall of the reaction vessel, which will affect the extraction efficiency of salt and the collection of salt. Summary of the invention

[0004] The invention provides a salt extraction device for coking wastewater, which is used to solve the technical problem that salt is easy to crystallize on the inner wall, thus affecting the collection of salt.

[0005] In view of this, the present invention provides a salt extraction device for coking wastewater, comprising a heating box with a hollow interior and an opening at the top end, a crystallization box with a hollow interior and an opening at the bottom end, a purification box arranged on one side of the heating box, a heating mechanism arranged in the heating box, a cleaning mechanism arranged in the crystallization box, a first driving mechanism, and a collecting mechanism arranged at the top end of the heating box, wherein the crystallization box is fixedly arranged on the top surface of the heating box, a water inlet pipe connected to the interior of the crystallization box is fixedly arranged on the top surface of the crystallization box, an air inlet pipe connected to the interior of the crystallization box and the purification box is fixedly arranged between the crystallization box and the purification box, and an air outlet pipe connected to the interior of the purification box is fixedly arranged at the bottom end of the purification box; The heating mechanism includes a plurality of heating plates and a metal plate fixedly arranged at the bottom end of the heating box, the metal plate is fixedly arranged in the heating box above the heating plate, the cleaning mechanism includes a stirring rod arranged along the height direction of the crystallization box, a plurality of groups of first clamping assemblies, a plurality of groups of second clamping assemblies, and a brush plate arranged along the height direction of the crystallization box, the top end of the stirring rod passes through the top wall of the crystallization box and is rotatably connected thereto, a bearing is arranged between the stirring rod and the top wall of the crystallization box, the first driving mechanism drives the stirring rod to rotate, and every two groups of the first clamping assemblies are symmetrically arranged on both sides of the stirring rod, the first clamping assembly includes a first fixed rod, a telescopic rod, and a first spring arranged along the axis direction of the crystallization box, one end of the first fixed rod is fixedly connected to the stirring rod, the telescopic rod includes a sleeve arranged along the axis direction of the crystallization box, an adjusting rod at one end extending into the sleeve and slidably connected thereto, the other end of the adjusting rod is fixedly arranged on the brush plate, the first spring is arranged in the sleeve between the sleeve and the adjusting rod, and is fixedly connected to the two respectively, and a plurality of bristles are fixedly arranged on the side of the brush plate away from the stirring rod.

[0006] Optionally, every two groups of the second clamping assemblies are symmetrically arranged on both sides of the stirring rod, and the second clamping assemblies include a second fixed rod arranged along the axis direction of the crystallization box, a third fixed rod arranged along the axis direction of the crystallization box, and a second spring fixed between the second fixed rod and the third fixed rod, one end of the second fixed rod is fixed on the stirring rod, the third fixed rod is arranged on the side of the second fixed rod close to the brush plate, and one end of the third fixed rod away from the second spring is fixedly connected to the brush plate.

[0007] Optionally, a first magnet block is fixedly disposed along the circumferential surface of the side wall of the crystallization box, and a second magnet block having a magnetic pole opposite to that of the first magnet block is fixedly disposed on the side of the brush plate away from the stirring rod.

[0008] Optionally, a mounting plate is fixedly provided on the top surface of the crystallization box, and the first driving mechanism includes a motor fixedly provided on the mounting plate, a first pulley fixedly provided on the output shaft of the motor, and a second pulley fixedly provided on the end of the stirring rod extending out from the side wall of the crystallization box, and a first belt is sleeved on the first pulley and the second pulley.

[0009] Optionally, an opening arranged along the width direction of the heating box is provided at the top end, and the collecting mechanism includes a collecting plate arranged parallel to the bottom surface of the heating box, a screw arranged along the length direction of the heating box, a scraper threadedly connected to the screw, and a limit rod arranged parallel to the screw. The collecting plate is fixed in the heating box below the opening, and the screw, scraper and limit rod are arranged above the collecting plate. One end of the screw passes through the side wall of the heating box and is rotatably connected thereto, and the other end is rotatably connected to the other opposite side wall. The bottom surface of the scraper abuts against the bottom surface of the collecting plate, the limit rod passes through the scraper and is slidably connected thereto, and both ends are fixed on the side walls of the heating box, and the second driving mechanism drives the screw to rotate.

[0010] Optionally, the second driving mechanism includes a connecting rod arranged along the height direction of the crystallization box, a third pulley fixed on the motor output shaft, a fourth pulley fixed at the top of the connecting rod, a first bevel gear, and a second bevel gear fixed at the end of the screw extending out of the side wall of the heating box. A fixing plate is fixed on the side wall of the crystallization box near the end of the screw extending out of the heating box, the connecting rod passes through the fixing plate and is rotatably connected thereto, the first bevel gear is fixed at the bottom end of the connecting rod and meshes with the second bevel gear, and a second belt is sleeved on the third pulley and the fourth pulley.

[0011] Optionally, a purification mechanism is provided in the purification box.

[0012] Optionally, the purification mechanism includes a filter screen, an activated carbon plate, and a diatomaceous earth plate, all of which are arranged above the air outlet pipe, and the filter screen, activated carbon plate, and diatomaceous earth plate are arranged at intervals in the height direction.

[0013] Optionally, a honeycomb inclined tube is fixedly provided in the water inlet pipe.

[0014] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages: When in use, open the cover plate and pour the wastewater to be treated from the water inlet pipe. The wastewater will first pass through the honeycomb inclined pipe to remove oil stains, and then enter the crystallization box. Start the heating mechanism to heat the wastewater in the crystallization box to evaporate and crystallize the wastewater, and salt will be analyzed. With long-term use, the salt will adhere to the inner wall of the crystallization box. Then start the first driving mechanism to drive the cleaning mechanism to clean the salt on the inner wall. Finally, the salt will fall on the collecting mechanism. Start the second driving mechanism to drive the collecting mechanism to collect the salt. The waste gas generated during the salt extraction process will enter the purification box through the air inlet pipe for purification, and finally be discharged from the air outlet pipe. It is not only convenient for the extraction and collection of salt, but also can protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a cross-sectional view for showing the heating mechanism and the cleaning mechanism.

[0018] Figure 3 It is a partial cross-sectional view to show the honeycomb inclined tube.

[0019] Figure 4 It is a partial cross-sectional view to show the telescopic rod.

[0020] Figure 5It is a schematic diagram for showing the partial structure of the first driving mechanism and the second driving mechanism.

[0021] Description of Reference Numerals 1. Heating box; 11. Baffle; 12. Screw; 2. Crystallization box; 21. Water inlet pipe; 211. Cover plate; 212. Honeycomb inclined pipe; 3. Purification box; 31. Air inlet pipe; 32. Air outlet pipe; 4. Heating mechanism; 41. Heating plate; 42. Metal plate; 5. Cleaning mechanism; 51. Stirring rod; 52. First clamping assembly; 521. First fixed rod; 522. Telescopic rod; 5221. Sleeve; 5222. Adjusting rod; 523. First spring; 53. Second clamping assembly; 531. Second fixed rod; 532. Third fixed rod; 533. Second spring; 534. Telescopic tube; 54. Brush plate; 541, bristles; 55, first magnet block; 56, second magnet block; 6, first driving mechanism; 61, motor; 62, first pulley; 63, second pulley; 64, first belt; 65, mounting plate; 7, collecting mechanism; 71, collecting plate; 72, screw; 73, scraper; 74, limit rod; 8, second driving mechanism; 81, connecting rod; 82, third pulley; 83, fourth pulley; 84, first bevel gear; 85, second bevel gear; 86, fixing plate; 87, second belt; 9, purification mechanism; 91, filter screen; 92, activated carbon board; 93, diatomaceous earth board. DETAILED DESCRIPTION

[0022] In order to make the technical scheme of the present invention better understood by the personnel of the technical field, the technical scheme in the embodiment of the present invention is clearly and completely described below. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiment in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

[0023] Reference Figure 1 and Figure 2 A salt extraction device for coking wastewater includes a heating box 1, a crystallization box 2, a purification box 3, a heating mechanism 4, a cleaning mechanism 5, a first driving mechanism 6, a collecting mechanism 7, a second driving mechanism 8, and a purification mechanism 9. The heating box 1 is in the shape of a rectangular block with a hollow interior and an open top. The crystallization box 2 is in the shape of a cylinder with a hollow interior and an open bottom. The bottom end of the crystallization box 2 is fixedly connected to the top of the heating box 1 and is connected to the interior of the heating box 1. A water inlet pipe 21 is fixedly provided on the top surface of the crystallization box 2. The water inlet pipe 21 is connected to the interior of the crystallization box 2, and a cover plate 211 is hinged on the top of the water inlet pipe 21. Refer to Figure 3A honeycomb inclined tube 212 is fixedly provided in the water inlet pipe 21, which is used to adsorb oil stains in the wastewater. The purification box 3 is arranged on one side of the heating box 1, and is used to purify the exhaust gas generated in the salt extraction process. The heating mechanism 4 is arranged at the bottom end of the heating box 1, and is used to evaporate the wastewater at high temperature. The cleaning mechanism 5 is arranged in the crystallization box 2, and is used to clean the salt on the inner wall of the crystallization box 2. The collecting mechanism 7 is arranged at the top of the heating box 1, and is used to collect the salt. The first driving mechanism 6 is used to provide power for the cleaning mechanism 5, and the second driving mechanism 8 is used to provide power for the collecting mechanism 7. The purification mechanism 9 is arranged in the purification box 3, and is used to purify the exhaust gas generated in the salt extraction process.

[0024] When in use, open the cover 211, pour waste water from the water inlet pipe 21, the waste water passes through the honeycomb inclined tube 212 to remove oil stains, and enters the crystallization box 2, and the heating mechanism 4 is started to heat and heat the waste water to evaporate. After long-term use, start the first drive mechanism 6 and the second drive mechanism 8, and the cleaning mechanism 5 can sweep down the salt remaining on the inner wall of the crystallization box 2, so that the salt falls to the collecting mechanism 7 for collection. During the salt extraction process, the waste gas generated can enter the purification box 3 for purification, which will also protect the environment.

[0025] Reference Figure 2 The heating mechanism 4 includes a heating plate 41 and a metal plate 42. The number of the heating plates 41 is multiple, and in this embodiment, there are three. The three heating plates 41 are arranged at intervals along the height direction of the heating box 1 and fixed at the bottom of the heating box 1. The metal plate 42 is fixed in the heating box 1 above the heating plate 41, and the metal plate 42 is arranged parallel to the heating plate 41. When the heating plate 41 is turned on, the heating plate 41 will emit heat, and the metal plate 42 plays a role of heat conduction, so that the heat can better enter the crystallization box 2, which is convenient for evaporating the wastewater.

[0026] Reference Figure 2 and Figure 4The cleaning mechanism 5 includes a stirring rod 51, a first clamping assembly 52, a second clamping assembly 53, and a brush plate 54. The stirring rod 51 is arranged along the height direction of the crystallization box 2. The top end of the stirring rod 51 passes through the top wall of the crystallization box 2 and is rotatably connected thereto, and a bearing (not shown in the figure) is arranged between the stirring rod 51 and the top wall of the crystallization box 2 to prevent the stirring rod 51 from falling. The first driving mechanism 6 drives the stirring rod 51 to rotate. The number of the first clamping assemblies 52 is multiple groups, four groups in this embodiment, and every two groups are symmetrically arranged on both sides of the stirring rod 51. The first clamping assembly 52 includes a first fixed rod 521, a telescopic rod 522, and a first spring 523. The first fixed rod 521 is arranged along the axial direction of the crystallization box 2, and one end of the first fixed rod 521 is fixed on the stirring rod 51. The telescopic rod 522 includes a sleeve 5221 and an adjusting rod 5222. The sleeve 5221 is arranged along the axis direction of the crystallization box 2, and one end of the sleeve 5221 is fixedly arranged on the end of the first fixed rod 521 away from the stirring rod 51. One end of the adjusting rod 5222 extends into the sleeve 5221 and is slidably connected thereto, and the other end is fixedly connected to the brush plate 54. The first spring 523 is arranged in the sleeve 5221 between the sleeve 5221 and the adjusting rod 5222, and the two ends of the first spring 523 are fixedly connected to the sleeve 5221 and the adjusting rod 5222, respectively. The first spring 523 is always in a compressed state to maintain the elastic force on the adjusting rod 5222.

[0027] Reference Figure 2 and Figure 4, the number of the second clamping assembly 53 is multiple groups, and in this embodiment, there are two groups. Each group of the second clamping assembly 53 is spaced apart from the first clamping assembly 52 along the height direction of the stirring rod 51. Every two groups of the second clamping assembly 53 are symmetrically arranged on both sides of the stirring rod 51. The second clamping assembly 53 includes a second fixed rod 531, a third fixed rod 532, a second spring 533, and a telescopic tube 534. The second fixed rod 531 is arranged along the axis direction of the crystallization box 2, and one end of the second fixed rod 531 is fixed on the stirring rod 51. The third fixed rod 532 is also arranged along the axis direction of the crystallization box 2. The third fixed rod 532 is arranged on the side of the second fixed rod 531 close to the brush plate 54, and one end of the third fixed rod 532 is fixedly connected to the brush plate 54. The second spring 533 is arranged between the second fixed rod 531 and the third fixed rod 532, and is fixedly connected to the two respectively. The second spring 533 is always in a compressed state to maintain the elastic force on the third fixed rod 532. The telescopic tube 534 is sleeved outside the second spring 533, and the two ends of the telescopic tube 534 are fixedly connected to the second fixed rod 531 and the third fixed rod 532 respectively. The brush plate 54 is arranged along the height direction of the crystallization box 2. A plurality of bristles 541 are fixedly arranged on the side of the brush plate 54 away from the stirring rod 51. A first magnet block 55 is fixedly arranged along the circumferential surface of the side wall of the crystallization box 2, and a second magnet block 56 is fixedly arranged between the bristles 541 and the brush plate 54 on the side of the brush plate 54 away from the stirring rod 51. The second magnet block 56 is arranged along the height direction of the brush plate 54, and the first magnet block 55 and the second magnet block 56 are opposite magnetic poles and attract each other.

[0028] When in use, the first driving mechanism 6 is started to drive the stirring rod 51 to rotate, which can also drive the brush plate 54 to rotate. Due to the pressure of the first spring 523 and the second spring 533, and the attraction of the first magnet block 55 and the second magnet block 56, the friction between the bristles 541 and the inner wall of the crystallization box 2 can be increased, which is more conducive to cleaning and collecting the salt attached to the inner wall of the crystallization box 2.

[0029] Reference Figure 5 The first driving mechanism 6 includes a motor 61, a first pulley 62, a second pulley 63, and a first belt 64. A mounting plate 65 is fixedly provided on the top surface of the crystallization box 2, the motor 61 is fixedly provided on the mounting plate 65, the first pulley 62 is sleeved on the output shaft of the motor 61, and is fixedly connected thereto. The second pulley 63 is fixedly provided on one end of the stirring rod 51 extending out of the top wall of the crystallization box 2, and the first belt 64 is sleeved on the first pulley 62 and the second pulley 63.

[0030] Start the motor 61. The output shaft of the motor 61 can drive the first pulley 62 to rotate. Since the first pulley 62 and the second pulley 63 are connected by the first belt 64, the second pulley 63 can also rotate, so that the stirring rod 51 rotates, and finally the bristles 541 clean the inner wall of the crystallization box 2, so that the salt adhering to the inner wall of the crystallization box 2 falls to the collection mechanism 7 for collection.

[0031] Reference Figure 1 and Figure 2 , the heating box 1 has an opening above the metal plate 42 at one end along its length direction, the opening is arranged along the width direction of the heating box 1, and a baffle 11 is hinged at the opening, the baffle 11 is fixed to the heating box 1 by screws 12, and a sealing ring (not shown in the figure) is fixed along the circumferential surface of the side of the baffle 11 close to the metal plate 42. The collecting mechanism 7 includes a collecting plate 71, a screw 72, a scraper 73, and a limiting rod 74. The collecting plate 71 is arranged below the opening parallel to the bottom surface of the heating box 1, and the collecting plate 71 is fixedly connected to the side wall of the heating box 1. The screw 72 and the limiting rod 74 are both arranged on the collecting plate 71 above the opening. The screw 72 is arranged along the length direction of the heating box 1, and one end of the screw 72 passes through the side wall of the heating box 1 and is rotatably connected thereto, and the other end is rotatably connected to the other opposite side wall. The scraper 73 is arranged on the screw 72 and is threadedly connected thereto. The scraper 73 is arranged along the width direction of the heating box 1, and the bottom surface of the scraper 73 abuts against the top surface of the collecting plate 71. The limiting rod 74 is arranged parallel to the screw 72, and the limiting rod 74 passes through the scraper 73 and is slidably connected thereto, and both ends of the limiting rod 74 are respectively fixed on the side walls of the heating box 1. The second driving mechanism 8 drives the screw 72 to rotate.

[0032] When in use, the second driving mechanism 8 is started, and the second driving mechanism 8 drives the screw 72 to rotate. Since the scraper 73 and the screw 72 are threadedly connected, coupled with the limiting effect of the limiting rod 74, the scraper 73 can only move along the length direction of the screw 72, so that the scraper 73 can scrape the salt that falls on the collecting plate 71 to the opening. The operator can collect the salt by opening the screw 12 and the baffle 11.

[0033] Reference Figure 5The second driving mechanism 8 includes a connecting rod 81, a third pulley 82, a fourth pulley 83, a first bevel gear 84, and a second bevel gear 85. Two fixing plates 86 are fixedly provided on the side wall of the crystallization box 2 near the end of the screw 72 extending out of the heating box 1, and the two fixing plates 86 are arranged at intervals along the height direction of the crystallization box 2. The connecting rod 81 is arranged along the height direction of the crystallization box 2, and the bottom end of the connecting rod 81 passes through the two fixing plates 86 and is rotatably connected thereto, so that the connecting rod 81 is always in a vertical state and will not fall off from the two fixing plates 86. The third pulley 82 is also sleeved on the output shaft of the motor 61 above the first pulley 62, and is fixedly connected to the output shaft of the motor 61. The fourth pulley 83 is sleeved on the top of the connecting rod 81 and is fixedly connected thereto. The third pulley 82 and the fourth pulley 83 are sleeved with a second belt 87. The first bevel gear 84 is fixed to the bottom end of the connecting rod 81 , and the second bevel gear 85 is fixed to one end of the screw rod 72 extending out of the side wall of the heating box 1 , and the first bevel gear 84 and the second bevel gear 85 are meshed with each other.

[0034] Start the motor 61. The output shaft of the motor 61 can drive the third pulley 82 to rotate. Since the third pulley 82 and the fourth pulley 83 are connected by the second belt 87, the fourth pulley 83 can also rotate, so that the connecting rod 81 rotates, which can also drive the first bevel gear 84 to rotate. Since the first bevel gear 84 and the second bevel gear 85 are meshed, the second bevel gear 85 rotates, thereby rotating the screw 72, and finally providing power for the scraper 73.

[0035] Reference Figure 1 and Figure 2 An air inlet pipe 31 is fixedly provided between the crystallization box 2 and the purification box 3, and the air inlet pipe 31 is connected to the inside of both. An air outlet pipe 32 is fixedly provided at the bottom end of the purification box 3, and the air outlet pipe 32 is connected to the inside of the purification box 3. The purification mechanism 9 includes a filter screen 91, an activated carbon plate 92, and a diatomaceous earth plate 93, and the filter screen 91 is a HEPA filter screen 91. The filter screen 91, the activated carbon plate 92, and the diatomaceous earth plate 93 are arranged parallel to each other, all arranged above the air outlet pipe 32, and are evenly fixed along the height direction of the purification box 3. The waste gas generated during the salt extraction process will enter the purification box 3 through the air inlet pipe 31, and then be adsorbed by the filter screen 91, the activated carbon plate 92, and the diatomaceous earth plate 93 in turn. After the waste gas is treated, it is discharged from the air outlet pipe 32, which is beneficial to the protection of the environment.

[0036] The use principle of the present invention is as follows: when in use, the cover plate 211 is opened, and the wastewater to be treated is poured in from the water inlet pipe 21. The wastewater will first pass through the honeycomb inclined pipe 212 to remove oil stains, and then enter the crystallization box 2. The heating mechanism 4 is started to heat the wastewater in the crystallization box 2, so that the wastewater evaporates and crystallizes, and salt is precipitated. With long-term use, the salt will adhere to the inner wall of the crystallization box 2, and then the first driving mechanism 6 is started to drive the cleaning mechanism 5 to clean the salt on the inner wall of the crystallization box 2. Finally, the salt will fall on the collecting mechanism 7, and the second driving mechanism 8 is started to drive the collecting mechanism 7 to collect the salt. The waste gas generated during the salt extraction process will enter the purification box 3 through the air inlet pipe 31 for purification, and finally be discharged from the air outlet pipe 32. It is not only convenient for extracting and collecting salt, but also can protect the environment.

[0037] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A salt extraction device for coking wastewater, characterized in that: The invention comprises a heating box (1) which is hollow inside and open at the top, a crystallization box (2) which is hollow inside and open at the bottom, a purification box (3) arranged on one side of the heating box (1), a heating mechanism (4) arranged in the heating box (1), a cleaning mechanism (5) arranged in the crystallization box (2), a first driving mechanism (6), and a collecting mechanism (7) arranged at the top of the heating box (1); the crystallization box (2) is fixedly arranged on the top surface of the heating box (1); a water inlet pipe (21) connected to the inside of the crystallization box (2) is fixedly arranged on the top surface of the crystallization box (2); an air inlet pipe (31) connected to the inside of the crystallization box (2) and the purification box (3) is fixedly arranged between the crystallization box (2) and the purification box (3); and an air outlet pipe (32) connected to the inside of the purification box (3) is fixedly arranged at the bottom end of the purification box (3); The heating mechanism (4) comprises a plurality of heating plates (41) and a metal plate (42) fixed at the bottom end of the heating box (1); the metal plate (42) is fixed in the heating box (1) above the heating plate (41); the cleaning mechanism (5) comprises a stirring rod (51) arranged along the height direction of the crystallization box (2), a plurality of groups of first clamping assemblies (52), a plurality of groups of second clamping assemblies (53), and a brush plate (54) arranged along the height direction of the crystallization box (2); the top end of the stirring rod (51) passes through the top wall of the crystallization box (2) and is rotatably connected thereto; a bearing is arranged between the stirring rod (51) and the top wall of the crystallization box (2); the first driving mechanism (6) drives the stirring rod (51) to rotate; each two groups of the first clamping assemblies (52) are symmetrically arranged on both sides of the stirring rod (51); A clamping assembly (52) comprises a first fixed rod (521), a telescopic rod (522), and a first spring (523) arranged along the axial direction of the crystallization box (2); one end of the first fixed rod (521) is fixedly connected to the stirring rod (51); the telescopic rod (522) comprises a sleeve (5221) arranged along the axial direction of the crystallization box (2); and an adjusting rod (5222) one end of which extends into the sleeve (5221) and is slidably connected thereto; the other end of the adjusting rod (5222) is fixedly arranged on a brush plate (54); the first spring (523) is arranged in the sleeve (5221) between the sleeve (5221) and the adjusting rod (5222), and is fixedly connected to the two respectively; and a plurality of bristles (541) are fixedly arranged on the side of the brush plate (54) away from the stirring rod (51).

2. The salt extraction device for coking wastewater according to claim 1, characterized in that: Each two groups of the second clamping assemblies (53) are symmetrically arranged on both sides of the stirring rod (51), and the second clamping assemblies (53) include a second fixed rod (531) arranged along the axial direction of the crystallization box (2), a third fixed rod (532) arranged along the axial direction of the crystallization box (2), and a second spring (533) fixed between the second fixed rod (531) and the third fixed rod (532), one end of the second fixed rod (531) is fixed on the stirring rod (51), the third fixed rod (532) is arranged on a side of the second fixed rod (531) close to the brush plate (54), and one end of the third fixed rod (532) away from the second spring (533) is fixedly connected to the brush plate (54).

3. The salt extraction device for coking wastewater according to claim 1, characterized in that: A first magnet block (55) is fixedly arranged along the circumferential surface of the side wall of the crystallization box (2), and a second magnet block (56) having a magnetic pole opposite to that of the first magnet block (55) is fixedly arranged on the side of the brush plate (54) away from the stirring rod (51).

4. The salt extraction device for coking wastewater according to claim 1, characterized in that: A mounting plate (65) is fixedly provided on the top surface of the crystallization box (2), and the first driving mechanism (6) comprises a motor (61) fixedly provided on the mounting plate (65), a first pulley (62) fixedly provided on the output shaft of the motor (61), and a second pulley (63) fixedly provided on one end of the stirring rod (51) extending out of the side wall of the crystallization box (2), and a first belt (64) is sleeved on the first pulley (62) and the second pulley (63).

5. The salt extraction device for coking wastewater according to claim 1, characterized in that: The top of the heating box (1) is provided with an opening arranged along its width direction. The collecting mechanism (7) comprises a collecting plate (71) arranged parallel to the bottom surface of the heating box (1), a screw (72) arranged along the length direction of the heating box (1), a scraper (73) threadedly connected to the screw (72), and a limiting rod (74) arranged parallel to the screw (72). The collecting plate (71) is fixedly arranged in the heating box (1) below the opening. The screw (72), the scraper (73) and the limiting rod (74) are arranged above the collecting plate (71). One end of the screw (72) passes through the side wall of the heating box (1) and is rotatably connected thereto, and the other end is rotatably connected to the other opposite side wall. The bottom surface of the scraper (73) abuts against the bottom surface of the collecting plate (71). The limiting rod (74) passes through the scraper (73) and is slidably connected thereto, and both ends are fixedly arranged on the side walls of the heating box (1). The second driving mechanism (8) drives the screw (72) to rotate.

6. The salt extraction device for coking wastewater according to claim 5, characterized in that: The second driving mechanism (8) comprises a connecting rod (81) arranged along the height direction of the crystallization box (2), a third pulley (82) fixed on the output shaft of the motor (61), a fourth pulley (83) fixed on the top of the connecting rod (81), a first bevel gear (84), and a second bevel gear (85) fixed on the end of the screw (72) extending out of the side wall of the heating box (1). A fixing plate (86) is fixed on the side wall of the crystallization box (2) near the end of the screw (72) extending out of the heating box (1). The connecting rod (81) passes through the fixing plate (86) and is rotatably connected thereto. The first bevel gear (84) is fixed on the bottom end of the connecting rod (81) and meshes with the second bevel gear (85). A second belt (87) is sleeved on the third pulley (82) and the fourth pulley (83).

7. The salt extraction device for coking wastewater according to claim 1, characterized in that: A purification mechanism (9) is provided in the purification box (3).

8. The salt extraction device for coking wastewater according to claim 7, characterized in that: The purification mechanism (9) comprises a filter screen (91), an activated carbon plate (92), and a diatomaceous earth plate (93) all arranged above the air outlet pipe (32); the filter screen (91), the activated carbon plate (92), and the diatomaceous earth plate (93) are arranged at intervals along the height direction.

9. The salt extraction device for coking wastewater according to claim 1, characterized in that: A honeycomb inclined tube (212) is fixedly arranged in the water inlet pipe (21).

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