A method for recovering o-phenylenediamine from wastewater

Abstract

The present application relates to o-phenylenediamine recovery technical field, specifically to a kind of method for recycling o-phenylenediamine in wastewater, comprising the following steps: step one, wastewater is entered into evaporation tank inside by the feed pipe in recovery device, and evaporation is carried out in evaporation tank inside, water vapor generated by evaporation carries o-phenylenediamine into recovery box inside by through groove, inorganic salt generated in evaporation process is precipitated and adhered on evaporation tank inner wall, and by rotating motor control rotation shaft rotation to drive stirring plate rotation to stir wastewater;Step two, inorganic salt in evaporation tank inner wall is cleaned by cleaning mechanism;Step three, resin particles are stirred by mixing mechanism;It is solved in the prior art, although the inorganic salt particles in evaporation tank inner wall can be removed, when evaporation tank inner wall is uneven, inorganic salt particles cannot be cleaned completely, and in the prior art, resin particles are not uniformly contacted with steam, leading to insufficient absorption of o-phenylenediamine and other problems.

Description

Technical Field

[0001] This invention relates to the field of o-phenylenediamine recovery technology, specifically a method for recovering o-phenylenediamine from wastewater. Background Technology

[0002] Chinese patent discloses an o-phenylenediamine wastewater recovery device (publication number: CN215403598U). This patent includes an evaporator, with a condensation adsorption tank connected to one side. A tank cover is installed at the top of the evaporator, and a power mechanism is installed above the tank cover. A shoveling mechanism is installed below the power mechanism. The shoveling mechanism includes a shoveling shaft, the bottom end of which penetrates the tank cover and is fixedly fitted with a shoveling frame. A shoveling plate is installed on the side of the shoveling frame away from the shoveling shaft, and the shoveling plate is in contact with the inner wall of the evaporator. By setting a shoveling mechanism inside the evaporator, the phenomenon of inorganic salts adhering to the wall during wastewater evaporation and crystallization can be effectively avoided. The inorganic salt particles formed inside the evaporator are small and can flow smoothly out of the evaporator outlet, avoiding the problem of outlet blockage. By installing a torsion spring, the edge of the shoveling plate can fit well against the inner wall of the evaporator, while preventing the shoveling plate from jamming with the inner wall, thus improving the reliability of the device.

[0003] Although the aforementioned patent can remove inorganic salt particles from the inner wall of the evaporator, the inorganic salt particles cannot be completely removed when the inner wall of the evaporator is uneven. Furthermore, the resin particles in the device do not come into uniform contact with the steam, resulting in insufficient absorption of o-phenylenediamine.

[0004] To address the aforementioned shortcomings, a technical solution is provided. Summary of the Invention

[0005] The technical problem to be solved by this invention is as follows:

[0006] In the prior art, although inorganic salt particles can be removed from the inner wall of the evaporator, the inorganic salt particles cannot be completely removed when the inner wall of the evaporator is uneven. In addition, the resin particles in the prior art do not come into uniform contact with the steam, resulting in insufficient absorption of o-phenylenediamine.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A method for recovering o-phenylenediamine from wastewater includes the following steps:

[0009] Step 1: Wastewater enters the evaporator through the feed pipe in the recovery device and evaporates inside the evaporator. The water vapor generated by evaporation carries o-phenylenediamine into the recovery tank through the trough. Inorganic salts generated during evaporation precipitate out and adhere to the inner wall of the evaporator. The rotating shaft is controlled by a rotating motor to rotate the stirring plate and stir the wastewater.

[0010] Step 2: When inorganic salts need to be cleaned, the rotating shaft is controlled by rotating the motor, so that the telescopic plate extends against the action of the telescopic spring and the cleaning shaft abuts against the inner wall of the evaporator for cleaning. When the telescopic plate extends, the drive gear and the drive rack move relative to each other, so that the rotation of the drive gear drives the rotation of the eccentric cam. The eccentric cam squeezes the extrusion plate, so that the air bag is squeezed and thus squeezes several cleaning shafts. The air bag and several cleaning shafts can make the cleaning shaft abut against the uneven inner wall of the evaporator.

[0011] Step 3: The rotation of the rotating shaft drives the rotating plate to rotate, causing the mixing shaft at the bottom of the rotating plate to rotate with the rotating plate in the annular groove, stirring the resin particles inside the recycling box. Through the relative rotation of the mixing gear and the annular gear, the mixing gear is driven to rotate, so that the spiral blades on the mixing shaft rotate synchronously on their own axis while rotating in a circular motion. The spiral blades can transfer the resin particles at the bottom of the recycling box to the top.

[0012] Furthermore, the recycling device includes an evaporator, an internal rotating shaft, and a plurality of stirring plates for stirring wastewater symmetrically fixed on the outer surface of the rotating shaft. A plurality of cleaning mechanisms for cleaning the inner wall of the evaporator are evenly arranged on the side of the stirring plates away from the rotating shaft. A recycling box is fixedly installed on the outer surface of the evaporator, and the evaporator and the recycling box are connected by a through groove located near the bottom of the recycling box. The inside of the recycling box contains resin particles for adsorbing o-phenylenediamine in the wastewater, and a mixing mechanism for mixing the resin particles is provided on the recycling box.

[0013] Furthermore, a fixing plate is fixedly installed on one side of the evaporator, and a rotating motor is fixedly installed at the top and bottom of the fixing plate. The top end of the rotating shaft passes through the evaporator and is fixedly connected to the output end of the rotating motor.

[0014] Furthermore, a feed pipe is fixedly installed on one side of the evaporator, and one end of the feed pipe extends into the interior of the evaporator.

[0015] Furthermore, the cleaning mechanism includes a telescopic groove formed on the mixing plate, a telescopic plate slidably disposed inside the telescopic groove, a telescopic spring fixedly disposed between the telescopic groove and the telescopic plate, and a plurality of cleaning shafts passing through and slidably disposed on the side of the telescopic plate away from the telescopic spring.

[0016] Furthermore, the telescopic plate has a cleaning groove inside, and an airbag is installed inside the cleaning groove. One end of several cleaning shafts abuts against the side of the airbag, and a return spring is sleeved on the outer surface of the cleaning shaft. The two ends of the return spring are fixedly connected to the cleaning shaft and the telescopic plate, respectively.

[0017] Furthermore, a squeezing plate is slidably arranged inside the cleaning groove, with one side of the squeezing plate abutting against the side of the airbag away from the cleaning shaft. An eccentric cam is rotatably arranged inside the cleaning groove via a drive shaft, with one side of the eccentric cam abutting against the side of the squeezing plate away from the airbag.

[0018] Furthermore, one end of the drive shaft extends into the telescopic groove and is fixedly provided with a drive gear, and a drive rack that meshes with the drive gear is fixedly provided inside the cleaning groove.

[0019] Furthermore, the mixing mechanism includes an annular groove formed on the top of the recycling tank, the annular groove extending into the interior of the recycling tank, the top end of the rotating shaft penetrating the evaporator and fixedly mounted with a rotating plate, a mixing shaft rotatably mounted at the bottom end of the rotating plate away from the rotating shaft, and a spiral blade fixedly mounted on the outer surface of the mixing shaft.

[0020] Furthermore, a ring gear is fixedly installed on the top of the recycling bin, and a mixing gear that meshes with the ring gear is fixedly installed on the outer surface of the mixing shaft.

[0021] The beneficial effects of this invention are:

[0022] In this invention, the cleaning mechanism allows wastewater to enter the evaporator for evaporation. The resulting water vapor carries o-phenylenediamine through a channel into the recovery tank. Inorganic salts produced during evaporation precipitate and adhere to the inner wall of the evaporator. A rotating motor controls the rotation of the rotating shaft, which in turn drives the stirring plate to agitate the wastewater, improving evaporation efficiency. When the inorganic salts need to be cleaned, the rotating motor controls the rotating shaft to rotate at a higher speed, causing the telescopic plate to extend against the telescopic spring and the cleaning shaft to abut against the inner wall of the evaporator for cleaning. When the telescopic plate extends, the drive gear and drive rack move relative to each other, causing the drive gear to rotate and drive the eccentric cam to rotate. The eccentric cam then squeezes the extrusion plate, causing the airbag to be squeezed, which in turn squeezes several cleaning shafts. The airbag and several cleaning shafts together allow the cleaning shafts to meet the cleaning needs of uneven inner walls of the evaporator, thus improving the applicability of the cleaning mechanism.

[0023] The mixing mechanism, through its rotating shaft, drives the rotating plate to rotate. The mixing shaft at the bottom of the rotating plate rotates within the annular groove, agitating the resin particles inside the recovery tank. This increases the contact area between the resin particles and o-phenylenediamine in the water vapor, improving the recovery efficiency. The relative rotation of the mixing gear and the annular gear further drives the mixing gear to rotate, causing the spiral blades on the mixing shaft to rotate simultaneously on their own axis. These spiral blades transport the resin particles from the bottom of the recovery tank to the top, facilitating thorough mixing and further enhancing the recovery efficiency of o-phenylenediamine from the water vapor. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the evaporator in this invention;

[0027] Figure 3 This is a top view of the overall structure in this invention;

[0028] Figure 4 In this invention Figure 2 Enlarged view of the structure at point A in the middle;

[0029] Figure 5 This is a schematic diagram of the internal structure of the telescopic plate in this invention;

[0030] Figure 6 This is a top view of the internal structure of the recycling bin in this invention;

[0031] Figure 7 This is a partial structural schematic diagram of the mixing mechanism in this invention.

[0032] In the diagram: 1. Evaporator; 2. Rotating shaft; 3. Cleaning mechanism; 4. Recovery box; 5. Mixing mechanism; 11. Fixed plate; 12. Rotating motor; 13. Feed pipe; 21. Stirring plate; 31. Telescopic groove; 32. Telescopic plate; 33. Telescopic spring; 34. Cleaning shaft; 321. Cleaning groove; 322. Airbag; 323. Return spring; 324. Extrusion plate; 325. Eccentric cam; 326. Drive gear; 327. Drive rack; 51. Annular groove; 52. Rotating plate; 53. Mixing shaft; 54. Spiral blade; 55. Ring gear; 56. Mixing gear. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1-7 The present invention provides a technical solution:

[0035] A method for recovering o-phenylenediamine from wastewater includes the following steps:

[0036] Step 1: Wastewater enters the evaporator 1 through the feed pipe 13 in the recovery device and evaporates inside the evaporator 1. The water vapor generated by evaporation carries o-phenylenediamine into the recovery box 4 through the channel. Inorganic salts generated during evaporation precipitate out and adhere to the inner wall of the evaporator 1. The rotating shaft 2 is controlled by the rotating motor 12 to rotate, thereby driving the stirring plate 21 to rotate and stir the wastewater.

[0037] Step 2: When inorganic salts need to be cleaned, the rotating shaft 2 is rotated by rotating the motor 12, so that the telescopic plate 32 extends against the action of the telescopic spring 33, and the cleaning shaft 34 abuts against the inner wall of the evaporator 1 for cleaning. When the telescopic plate 32 extends, the drive gear 326 and the drive rack 327 move relative to each other, so that the rotation of the drive gear 326 drives the rotation of the eccentric cam 325. The eccentric cam 325 squeezes the extrusion plate 324, so that the air bag 322 is squeezed, thereby squeezing several cleaning shafts 34. The air bag 322 and several cleaning shafts 34 can make the cleaning shafts 34 abut against the uneven inner wall of the evaporator 1.

[0038] Step 3: The rotation of the rotating shaft 2 drives the rotating plate 52 to rotate, so that the mixing shaft 53 at the bottom of the rotating plate 52 rotates with the rotating plate 52 in the annular groove 51, agitating the resin particles inside the recycling box 4. Through the relative rotation of the mixing gear 56 and the annular gear 55, the mixing gear 56 is driven to rotate, so that the spiral blades 54 on the mixing shaft 53 rotate synchronously on their own axis while rotating in a circular motion. The spiral blades 54 can transfer the resin particles at the bottom of the recycling box 4 to the top.

[0039] The recycling device includes an evaporator 1, with a rotating shaft 2 rotatably mounted inside the evaporator 1. Several stirring plates 21 for stirring wastewater are symmetrically fixed on the outer surface of the rotating shaft 2. Several cleaning mechanisms 3 for cleaning the inner wall of the evaporator 1 are evenly arranged on the side of the stirring plates 21 away from the rotating shaft 2. A recycling box 4 is fixedly mounted on the outer surface of the evaporator 1. The evaporator 1 and the recycling box 4 are connected by a through groove located near the bottom of the recycling box 4. Resin particles for adsorbing o-phenylenediamine in the wastewater are installed inside the recycling box 4. A mixing mechanism 5 for mixing the resin particles is installed on the recycling box 4.

[0040] A fixing plate 11 is fixedly installed on one side of the outside of the evaporator 1. A rotating motor 12 is fixedly installed at the top and bottom of the fixing plate 11. The top end of the rotating shaft 2 passes through the evaporator 1 and is fixedly connected to the output end of the rotating motor 12.

[0041] A feed pipe 13 is fixedly installed on one side of the evaporator 1, and one end of the feed pipe 13 extends into the interior of the evaporator 1.

[0042] The cleaning mechanism 3 includes a telescopic groove 31 formed on the stirring plate 21. A telescopic plate 32 is slidably arranged inside the telescopic groove 31. A telescopic spring 33 is fixedly arranged between the telescopic groove 31 and the telescopic plate 32. Several cleaning shafts 34 are slidably arranged through the side of the telescopic plate 32 away from the telescopic spring 33.

[0043] The telescopic plate 32 has a cleaning groove 321 inside, and an airbag 322 is provided inside the cleaning groove 321. One end of several cleaning shafts 34 abuts against the side of the airbag 322. A return spring 323 is sleeved on the outer surface of the cleaning shaft 34. The two ends of the return spring 323 are fixedly connected to the cleaning shaft 34 and the telescopic plate 32, respectively.

[0044] An extrusion plate 324 is slidably disposed inside the cleaning groove 321. One side of the extrusion plate 324 abuts against the side of the airbag 322 away from the cleaning shaft 34. An eccentric cam 325 is rotatably disposed inside the cleaning groove 321 via a drive shaft. One side of the eccentric cam 325 abuts against the side of the extrusion plate 324 away from the airbag 322.

[0045] One end of the drive shaft extends into the telescopic groove 31 and is fixedly provided with a drive gear 326. The cleaning groove 321 is fixedly provided with a drive rack 327 that meshes with the drive gear 326.

[0046] The cleaning mechanism 3 allows wastewater to enter the evaporator 1 for evaporation. The resulting water vapor carries o-phenylenediamine through a trough into the recovery tank 4. Inorganic salts produced during evaporation precipitate and adhere to the inner wall of the evaporator 1. The rotating shaft 2 is controlled by the rotating motor 12 to rotate, thereby driving the stirring plate 21 to stir the wastewater and improve evaporation efficiency. When it is necessary to clean the inorganic salts, the rotating shaft 2 is controlled by the rotating motor 12 to rotate at a higher speed, causing the telescopic plate 32 to extend beyond the action of the telescopic spring 33. The cleaning shaft 34 abuts against the inner wall of the evaporator 1 to perform cleaning. When the telescopic plate 32 extends, the drive gear 326 and the drive rack 327 move relative to each other. The drive gear 326 rotates, which drives the eccentric cam 325 to rotate. The eccentric cam 325 squeezes the extrusion plate 324, which in turn squeezes the airbag 322, thereby squeezing the cleaning shafts 34. The airbag 322, together with the cleaning shafts 34, can make the cleaning shafts 34 meet the cleaning needs of the uneven inner wall of the evaporator 1, thus improving the applicability of the cleaning mechanism 3.

[0047] The top view of the recycling box 4 is circular, and the recycling box 4 is fitted onto the top of the outer surface of the evaporator 1.

[0048] The mixing mechanism 5 includes an annular groove 51 formed on the top of the recycling tank 4, the annular groove 51 extending into the interior of the recycling tank 4, the top end of the rotating shaft 2 penetrating the evaporator 1 and fixedly provided with a rotating plate 52, a mixing shaft 53 rotatably provided at the bottom of the rotating plate 52 away from the rotating shaft 2, and a spiral blade 54 fixedly provided on the outer surface of the mixing shaft 53.

[0049] A ring gear 55 is fixedly installed on the top of the recycling bin 4, and a mixing gear 56 that meshes with the ring gear 55 is fixedly installed on the outer surface of the mixing shaft 53.

[0050] The mixing mechanism 5 causes the rotating shaft 2 to rotate, which in turn drives the rotating plate 52 to rotate. The mixing shaft 53 at the bottom of the rotating plate 52 rotates with the rotating plate 52 in the annular groove 51, agitating the resin particles inside the recovery box 4. This increases the contact area between the resin particles and o-phenylenediamine in the water vapor, improving the recovery effect. The relative rotation of the mixing gear 56 and the annular gear 55 drives the mixing gear 56 to rotate, causing the spiral blades 54 on the mixing shaft 53 to rotate synchronously while rotating in a circular motion. The spiral blades 54 can transfer the resin particles at the bottom of the recovery box 4 to the top, facilitating thorough mixing of the resin particles inside the recovery box 4 and further improving the recovery effect of the resin particles on o-phenylenediamine in the water vapor.

[0051] Working principle:

[0052] In use, wastewater enters the evaporator 1 through the feed pipe 13 and evaporates inside. The water vapor generated during evaporation carries o-phenylenediamine into the recovery tank 4 through a channel. Inorganic salts generated during evaporation precipitate and adhere to the inner wall of the evaporator 1. The rotating shaft 2 is controlled by the rotating motor 12 to rotate, thereby driving the stirring plate 21 to rotate and stir the wastewater, improving evaporation efficiency. When it is necessary to clean the inorganic salts, the rotating shaft 2 is controlled by the rotating motor 12 to rotate at a higher speed, so that the telescopic plate 32 overcomes the telescopic spring 33. The extension plate 32 extends and the cleaning shaft 34 abuts against the inner wall of the evaporator 1 to perform cleaning. When the extension plate 32 extends, the drive gear 326 and the drive rack 327 move relative to each other. The drive gear 326 rotates and drives the eccentric cam 325 to rotate. The eccentric cam 325 squeezes the extrusion plate 324, which in turn squeezes the airbag 322 and squeezes the cleaning shafts 34. The airbag 322 and the cleaning shafts 34 can make the cleaning shafts 34 meet the cleaning needs of the uneven inner wall of the evaporator 1, thus improving the applicability of the cleaning mechanism 3.

[0053] The rotation of the rotating shaft 2 drives the rotating plate 52 to rotate, causing the mixing shaft 53 at the bottom of the rotating plate 52 to rotate in the annular groove 51 along with the rotating plate 52. This agitates the resin particles inside the recovery box 4, increasing the contact area between the resin particles and o-phenylenediamine in the water vapor and improving the recovery effect. The relative rotation of the mixing gear 56 and the annular gear 55 drives the mixing gear 56 to rotate, causing the spiral blades 54 on the mixing shaft 53 to rotate synchronously on their own axis while rotating in a circular motion. The spiral blades 54 can transfer the resin particles at the bottom of the recovery box 4 to the top, facilitating thorough mixing of the resin particles inside the recovery box 4 and further improving the recovery effect of the resin particles on o-phenylenediamine in the water vapor.

[0054] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for recovering o-phenylenediamine from wastewater, characterized in that, Includes the following steps: Step 1: Wastewater enters the evaporator (1) through the feed pipe (13) in the recycling device and evaporates inside the evaporator (1). The water vapor generated by evaporation carries o-phenylenediamine into the recycling tank (4) through the channel. The inorganic salts generated during evaporation precipitate out and adhere to the inner wall of the evaporator (1). The rotating shaft (2) is controlled by the rotating motor (12) to rotate, thereby driving the stirring plate (21) to rotate and stir the wastewater. Step 2: When it is necessary to clean the inorganic salt, the rotating shaft (2) is controlled to rotate at a higher speed by rotating the motor (12), so that the telescopic plate (32) extends against the action of the telescopic spring (33) and the cleaning shaft (34) abuts against the inner wall of the evaporator (1) for cleaning. When the telescopic plate (32) extends, the drive gear (326) and the drive rack (327) move relative to each other, so that the rotation of the drive gear (326) drives the rotation of the eccentric cam (325), and the eccentric cam (325) squeezes the extrusion plate (324), so that the air bag (322) is squeezed and squeezes several cleaning shafts (34). The air bag (322) cooperates with several cleaning shafts (34) to make the cleaning shaft (34) abut against the uneven inner wall of the evaporator (1); Step 3: The rotating shaft (2) rotates while driving the rotating plate (52) to rotate, so that the mixing shaft (53) at the bottom of the rotating plate (52) rotates with the rotating plate (52) in the annular groove (51), stirring the resin particles inside the recycling box (4). Through the relative rotation of the mixing gear (56) and the annular gear (55), the mixing gear (56) is driven to rotate, so that the spiral blades (54) on the mixing shaft (53) rotate synchronously while rotating in a circle, and the resin particles at the bottom of the recycling box (4) are transferred to the top through the spiral blades (54). The top view of the recycling box (4) is circular, and the recycling box (4) is fitted onto the top of the outer surface of the evaporator (1); The recycling device includes an evaporator (1), a rotating shaft (2) is rotatably arranged inside the evaporator (1), and several stirring plates (21) for stirring wastewater are symmetrically fixed on the outer surface of the rotating shaft (2). Several cleaning mechanisms (3) for cleaning the inner wall of the evaporator (1) are evenly arranged on the side of the stirring plate (21) away from the rotating shaft (2). A recycling box (4) is fixedly arranged on the outer surface of the evaporator (1). The evaporator (1) and the recycling box (4) are connected by a through groove. The through groove is located near the bottom of the recycling box (4). Resin particles for adsorbing o-phenylenediamine in wastewater are arranged inside the recycling box (4). A mixing mechanism (5) for mixing the resin particles is arranged on the recycling box (4). The cleaning mechanism (3) includes a telescopic groove (31) opened on the stirring plate (21), a telescopic plate (32) is slidably arranged inside the telescopic groove (31), a telescopic spring (33) is fixedly arranged between the telescopic groove (31) and the telescopic plate (32), and a plurality of cleaning shafts (34) are slidably arranged through the side of the telescopic plate (32) away from the telescopic spring (33). The telescopic plate (32) has a cleaning groove (321) inside, and an airbag (322) is provided inside the cleaning groove (321). One end of several cleaning shafts (34) abuts against the side of the airbag (322). A return spring (323) is sleeved on the outer surface of the cleaning shaft (34). The two ends of the return spring (323) are fixedly connected to the cleaning shaft (34) and the telescopic plate (32) respectively. An extrusion plate (324) is slidably disposed inside the cleaning groove (321). One side of the extrusion plate (324) abuts against the side of the airbag (322) away from the cleaning shaft (34). An eccentric cam (325) is rotatably disposed inside the cleaning groove (321) via a drive shaft. One side of the eccentric cam (325) abuts against the side of the extrusion plate (324) away from the airbag (322). One end of the drive shaft extends into the telescopic groove (31) and is fixedly provided with a drive gear (326). The cleaning groove (321) is fixedly provided with a drive rack (327) that meshes with the drive gear (326).

2. The method for recovering o-phenylenediamine from wastewater according to claim 1, characterized in that, A fixing plate (11) is fixedly installed on one side of the evaporator (1). A rotating motor (12) is fixedly installed at the top and bottom of the fixing plate (11). The top end of the rotating shaft (2) passes through the evaporator (1) and is fixedly connected to the output end of the rotating motor (12).

3. The method for recovering o-phenylenediamine from wastewater according to claim 1, characterized in that, A feed pipe (13) is fixedly provided on one side of the evaporator (1), and one end of the feed pipe (13) extends into the interior of the evaporator (1).

4. The method for recovering o-phenylenediamine from wastewater according to claim 1, characterized in that, The mixing mechanism (5) includes an annular groove (51) opened on the top of the recycling tank (4), the annular groove (51) extends into the inside of the recycling tank (4), the top end of the rotating shaft (2) passes through the evaporator (1) and is fixedly provided with a rotating plate (52), a mixing shaft (53) is rotatably provided at the bottom of the end of the rotating plate (52) away from the rotating shaft (2), and a spiral blade (54) is fixedly provided on the outer surface of the mixing shaft (53).

5. The method for recovering o-phenylenediamine from wastewater according to claim 4, characterized in that... The top of the recycling bin (4) is fixedly provided with a ring gear (55), and the outer surface of the mixing shaft (53) is fixedly provided with a mixing gear (56) that meshes with the ring gear (55).

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