Wastewater multi-stage treatment device for arsine production

Abstract

The invention relates to the field of wastewater treatment, in particular to a wastewater multi-stage treatment device for arsine production, which comprises a treatment tank and a stirring unit arranged in the treatment tank, a discharging port is formed in the side wall of the treatment tank, the treatment tank is of a cylindrical structure, a bottom plate is arranged in the treatment tank in the axis direction of the treatment tank in a sliding mode, a plurality of filtering holes are evenly and vertically formed in the bottom plate in a penetrating mode, the bottom plate has the lowest position and the highest position when moving in the vertical direction, and when the bottom plate is located at the lowest position, the filtering holes penetrate through the bottom plate. The bottom plate is located at the bottom of the treatment tank, when the bottom plate is located at the highest position, the upper end face of the bottom plate and the lower end face of the discharging port are coplanar, a scraper is arranged at the bottom of the stirring unit in the radial direction of the treatment tank and synchronously rotates along with the stirring unit, and when the bottom plate is located at the lowest position, the upper portion of the bottom plate and the scraper are in a non-contact state. According to the invention, self-cleaning is realized, and the wastewater treatment efficiency is ensured.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment, and in particular to a multi-stage wastewater treatment device for arsine production. Background Art

[0002] In the preparation process of arsine, a reactor is required for preparation. At the same time, arsine salt solution will be produced in the preparation process. The arsine salt as the residual liquid of the reactor needs to be discharged into a purification kettle for purification treatment. During the treatment, zinc oxide is added and the residual liquid is heated by steam to separate the arsine in the arsine salt solution by distillation. At the same time, the separated arsine is blown away by nitrogen. Then the residual liquid is discharged as waste liquid after passing through an adsorption tower and a distillation tower. The waste liquid contains substances such as zinc sulfate, sulfuric acid, zinc oxide, arsine and water, which need to be treated before being discharged.

[0003] Chinese patent CN103408162B discloses a method for treating arsenic-containing wastewater, which is characterized by the following steps: step 1, the arsenic-containing wastewater is introduced into a first water tank, and after the arsenic-containing wastewater in the first water tank reaches a set liquid level, a first stirrer starts stirring, and at the same time, an iron chelating agent, a flocculant and an alkaline pH value regulator are added, flocculation is performed using the flocculant, and the pH value of the arsenic-containing wastewater is adjusted to a set value using the alkaline pH value regulator, and after sufficient reaction, a preliminarily treated waste liquid is obtained; step 2, the preliminarily treated waste liquid is pumped into a first filter for filtration, and the filtered filtrate is introduced into a second water tank, and the filter residue is trapped in the first filter. device; step 3, when the filtrate in the second water tank reaches the set liquid level, the second agitator is started, and at the same time, an iron chelating agent, a flocculant and an alkaline pH value adjusting agent are added, flocculation is performed using the flocculant, and the pH value of the arsenic-containing wastewater is adjusted to the set value using the alkaline pH value adjusting agent to obtain the filtrate after secondary treatment; step 4, the filtrate after secondary treatment is pumped into the second filter for filtration, and the filtered filtrate is introduced into the third water tank, and the filter residue is retained in the second filter. If the arsenic content of the filtrate in the third water tank does not meet the standard, it is introduced into the first water tank and then returns to step 1 and is executed again, otherwise, its pH value is adjusted to the set value and then discharged.

[0004] The above scheme provides a method for treating wastewater containing arsenic, but precipitates are generated in each step, and there is no device for discharging the corresponding precipitates in each process. The traditional multi-stage wastewater treatment is composed of multiple wastewater treatment tanks connected in series. The precipitates after the reaction will accumulate at the bottom of the wastewater treatment tank and cannot be discharged. After long-term use, a large amount of precipitates will inevitably accumulate at the bottom of the wastewater treatment tank. At the same time, the tank body needs to be stirred when treating the wastewater. Excessive precipitates at the bottom of the tank body will be lifted up during stirring, seriously affecting the treatment effect of the waste liquid. In order to avoid the above situation, it is often necessary to manually clean the tank body, but the cleaning is difficult and labor-intensive. Summary of the invention

[0005] In view of the above problems, a multi-stage treatment device for wastewater from arsine production is provided. By arranging a bottom plate that can be lifted and lowered in a vertical direction in the treatment tank and cleaning the upper end surface of the raised bottom plate by a scraper, the sediment accumulated at the bottom of the treatment tank can be self-cleaned, thereby achieving self-cleaning and ensuring the wastewater treatment efficiency.

[0006] In order to solve the problems of the prior art, the present invention provides a multi-stage treatment device for wastewater used in arsine production, comprising a treatment tank and a stirring unit arranged in the treatment tank; a discharge port is provided on the side wall of the treatment tank, the treatment tank is a cylindrical structure, a bottom plate is slidably provided in the treatment tank along the axial direction of the treatment tank, a plurality of filter holes are evenly and vertically penetrated on the bottom plate, the bottom plate has a lowest position and a highest position when moving in the vertical direction, when the bottom plate is at the lowest position, the bottom plate is located at the bottom of the treatment tank, when the bottom plate is at the highest position, the upper end surface of the bottom plate is coplanar with the lower end surface of the discharge port, a scraper is provided at the bottom of the stirring unit along the radial direction of the treatment tank, the scraper rotates synchronously with the stirring unit, when the bottom plate is at the lowest position, the upper part of the bottom plate is in a non-contact state with the scraper, when the bottom plate rises from the lowest position to the highest position, the bottom plate contacts with the scraper, and can drive the scraper to rise synchronously until the bottom plate reaches the highest position and stops moving.

[0007] Preferably, the bottom plate is a rotating body structure, the horizontal cross-sectional area of ​​the upper part of the bottom plate is smaller than the horizontal cross-sectional area of ​​the lower part of the bottom plate, the upper end face of the bottom plate is an inclined structure, and the inclined structure is inclined downward from one side of the axis of the bottom plate toward the outer periphery of the bottom plate, and the lower part of the scraper is matched with the upper end face of the bottom plate.

[0008] Preferably, the bottom plate reciprocates along the axial direction of the processing tank, the time the bottom plate is maintained at the lowest position is preset to a first rated time, and the time the bottom plate is maintained at the highest position is preset to a second rated time. The bottom plate starts to rise when it stays at the lowest position for the first rated time, and starts to descend when it stays at the highest position for the second rated time.

[0009] Preferably, a feeding unit is provided at the upper part of the processing tank, and the feeding unit includes a temporary storage bin for pre-storing the waste liquid discharged into the processing tank. A switch valve is provided at the bottom of the temporary storage bin, and the switch valve opens when the bottom plate descends from the highest position.

[0010] Preferably, a float is provided in the temporary storage bin for movement in the vertical direction, and a trigger button is provided directly above the float. When waste liquid is injected into the temporary storage bin, the float rises in the vertical direction. After the float rises, the trigger button can be triggered, and the switch valve is activated and opened by one quarter. The activation command of the trigger button to the switch valve has the highest priority.

[0011] Preferably, the stirring unit includes a plurality of telescopic rods, which are arranged in the processing tank along the axis of the processing tank, and adjacent telescopic rods are mutually sleeved and slidably matched in the vertical direction, and adjacent telescopic rods are connected, and each telescopic rod is provided with a stirring rod. The plurality of telescopic rods located in the processing tank form a driving part, and a first driving unit is provided on the upper part of the driving part. The first driving unit is used to drive the telescopic rods to rotate, and can push the telescopic rods to retract when the bottom plate rises, and after the bottom plate reaches the highest position, all the telescopic rods retract to the shortest state.

[0012] Preferably, a ventilation groove is provided in the vertical direction on the driving part formed by the telescopic rod, and an air pump is arranged on the upper part of the ventilation groove. The air pump inflates the ventilation groove when the base plate descends, and disconnects from the ventilation groove when the base plate descends to the lowest position.

[0013] Preferably, a collecting unit is provided on the periphery of the processing tank, and the collecting unit is used to collect the sediment discharged from the discharge port. The collecting unit includes an outer shell which is sleeved on the periphery of the processing tank, and there is an annular gap between the outer shell and the processing tank. A collecting box is slidably provided in the vertical direction on the annular gap, and a second driving unit for driving the collecting box to move in the vertical direction is provided at the lower part of the collecting box. The collecting box and the outer shell together form a collecting trough.

[0014] Preferably, a discharge port is provided on the side wall of the shell, the discharge port is lower than the discharge port, and the collecting box has a first stop position and a second stop position when moving in the vertical direction, and the first stop position and the second stop position are distributed from top to bottom in the vertical direction. When the collecting box is located at the first stop position, the collecting box is located on the horizontal side of the discharge port and forms a collecting groove with the shell, and when the collecting box is located at the second stop position, the collecting box is located on the horizontal side of the discharge port and the collecting groove disappears.

[0015] Preferably, a fan is provided at the upper portion of the housing, one side of the fan is connected to an air filter, and the fan is used to extract the exhaust gas in the treatment tank.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Put a certain amount of waste liquid and a corresponding proportion of chemical agents into the treatment tank. At this time, the bottom plate is at the lowest position. Then the stirring unit in the treatment tank starts stirring. The scraper arranged at the bottom of the stirring unit rotates synchronously with the stirring unit. At this time, the lower part of the scraper is in a non-contact state with the upper part of the bottom plate. In this way, the scraper will not lift up the sediment deposited on the bottom plate when rotating with the stirring unit. When the bottom plate is at the lowest position, a first rated time is preset. When the bottom plate stays at the lowest position for the first rated time, the bottom plate starts to rise. During the rising process, the bottom plate can also scrape off the solids attached to the inner wall of the treatment tank, and during the rising process of the bottom plate, the bottom plate will stir The scraper at the bottom of the mixing unit rises together, and the lower part of the scraper is completely matched with the upper end surface of the bottom plate. When the bottom plate rises to the highest position, the upper end surface of the bottom plate is coplanar with the lower end surface of the discharge port. At the same time, the mixing unit is continuously in a rotating state, and the mixing unit drives the scraper to rotate. The rotating scraper sweeps the upper end surface of the bottom plate at the highest position, so that the sediment accumulated on the bottom plate can be discharged through the discharge port. When the bottom plate is at the highest position, a second rated time is preset. When the bottom plate stays at the highest position for the second rated time, the bottom plate begins to descend, thereby realizing the function of the treatment tank to self-clean the sediment at its bottom.

[0017] 2. During cleaning, the feeding unit has the function of storing waste liquid. The feeding unit can store waste liquid in advance when the treatment tank is self-cleaning. After cleaning, the bottom plate drops and the feeding unit puts waste liquid in. Therefore, there is no need to suspend the wastewater treatment device during self-cleaning, which not only realizes self-cleaning but also ensures wastewater treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of a multi-stage treatment device for wastewater used in arsine production.

[0019] Figure 2 It is a side view of a multi-stage treatment device for wastewater used in arsine production.

[0020] Figure 3 It is a multi-stage treatment device for wastewater from arsine production. Figure 2 Schematic cross-sectional view at AA in the middle.

[0021] Figure 4 A cutaway perspective view of a multi-stage treatment plant for wastewater from arsine production Figure 1 .

[0022] Figure 5 It is a multi-stage treatment device for wastewater from arsine production. Figure 4 A local enlarged schematic diagram of point B in the middle.

[0023] Figure 6 It is a multi-stage treatment device for wastewater from arsine production. Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0024] Figure 7 It is a multi-stage treatment device for wastewater from arsine production. Figure 4 A local enlarged schematic diagram of point D in the middle.

[0025] Figure 8 A cutaway perspective view of a multi-stage treatment plant for wastewater from arsine production Figure 2 .

[0026] Fig. 9 It is a multi-stage treatment device for wastewater from arsine production. Figure 8 A partial enlarged schematic diagram of point E in the middle.

[0027] Fig.10 The present invention is a cutaway stereoscopic schematic diagram of a multi-stage treatment device for wastewater used in arsine production when the bottom plate is in a clean state.

[0028] The numbers in the figure are: 1. Processing tank; 11. Discharge port; 2. Stirring unit; 21. Scraper; 22. Telescopic rod; 23. Stirring rod; 24. First drive unit; 241. First gear ring; 242. First gear; 243. First rotary driver; 25. Ventilation groove; 26. Air pump; 3. Bottom plate; 31. Winder; 32. Towing rope; 4. Feeding unit; 41. Temporary storage bin; 42. Switch valve; 43. Float; 44. Trigger button; 5. Collecting unit; 51. Collecting box; 52. Casing; 53. Second drive unit; 531. Second rotary driver; 532. Second gear; 533. Second gear ring; 534. Third gear ring; 535. Fixed bracket; 536. Screw rod; 54. Discharge port; 55. Fan; 56. Reversing valve. DETAILED DESCRIPTION

[0029] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figure 1-Figure 4 , Figure 8 and Fig. 9A multi-stage treatment device for wastewater from arsine production comprises a treatment tank 1 and a stirring unit 2 arranged in the treatment tank 1; a discharge port 11 is provided on the side wall of the treatment tank 1, the treatment tank 1 is a cylindrical structure, a bottom plate 3 is slidably provided in the treatment tank 1 along the axial direction of the treatment tank 1, a plurality of filter holes are evenly and vertically penetrated on the bottom plate 3, the bottom plate 3 has a lowest position and a highest position when moving in the vertical direction, when the bottom plate 3 is at the lowest position, the bottom plate 3 is located at the bottom of the treatment tank 1, when the bottom plate 3 is at the highest position, the upper end surface of the bottom plate 3 is coplanar with the lower end surface of the discharge port 11, a scraper 21 is provided at the bottom of the stirring unit 2 along the radial direction of the treatment tank 1, the scraper 21 rotates synchronously with the stirring unit 2, when the bottom plate 3 is at the lowest position, the upper part of the bottom plate 3 is in a non-contact state with the scraper 21, when the bottom plate 3 rises from the lowest position to the highest position, the bottom plate 3 contacts the scraper 21, and can drive the scraper 21 to rise synchronously until the bottom plate 3 reaches the highest position and stops moving.

[0031] A common multi-stage wastewater treatment method is to set up multiple treatment tanks 1, and all the treatment tanks 1 are connected in series. When treating the wastewater, the wastewater produced by arsine is sequentially passed through the treatment tanks 1 arranged in series. A plurality of discharge ports 11 are provided, and the discharge ports 11 are evenly distributed on the side wall of the treatment tank 1 around the axis of the treatment tank 1. A feeding unit 4 is provided at the upper part of the treatment tank 1. The feeding unit 4 is used to feed the waste liquid from the upper part of the treatment tank 1 into the treatment tank 1 for treatment. A liquid discharge port is provided at the lower part of the treatment tank 1. The treated waste liquid is discharged from the liquid discharge port and then enters the next treatment tank 1 for secondary treatment. After multiple treatments, the treated liquid that meets the emission standards can be discharged. In the above-mentioned treatment process, different chemical agents need to be added to the treatment tank 1 during the treatment of the waste liquid, so that the chemical agents react with different substances in the waste liquid, thereby separating the harmful substances. Some of the harmful substances are discharged in the form of gas, and some are converted into precipitates and precipitated to the bottom of the treatment tank 1. The precipitates precipitated to the bottom of the treatment tank 1 cannot be discharged by the device itself, but need to be cleaned manually regularly, which requires a large workload. At the same time, the treatment tank 1 needs to be in a stopped state during cleaning, and the wastewater treatment efficiency is low.

[0032] In order to avoid the above problems, the interior of the treatment tank 1 is redesigned. The specific structure and working principle are as follows: a reel 31 is arranged on the upper part of the bottom plate 3, and a traction rope 32 is wound in the reel 31. After the traction rope 32 is released from the reel 31, it is fixedly connected to the upper part of the bottom plate 3. The bottom plate 3 and the treatment tank 1 can only slide together in the vertical direction. A certain amount of waste liquid and a corresponding proportion of chemical agents are put into the treatment tank 1. At this time, the bottom plate 3 is in the lowest position, and then the stirring unit 2 in the treatment tank 1 starts to stir. The stirring unit 2 arranged at the bottom of the stirring unit 2 The scraper 21 at the bottom rotates synchronously with the stirring unit 2. At this time, the lower part of the scraper 21 is in a non-contact state with the upper part of the bottom plate 3. In this way, the scraper 21 will not lift up the sediment deposited on the bottom plate 3 when rotating with the stirring unit 2. When the bottom plate 3 is at the lowest position, the straight-line distance between the scraper 21 and the bottom plate 3 in the vertical direction needs to be determined according to actual conditions, that is, when the scraper 21 rotates, it will not lift up the sediment on the bottom plate 3 at the lowest position. This ensures that the sediment can stably settle to the bottom of the processing tank 1 and be received by the bottom plate 3.

[0033] When the bottom plate 3 is at the lowest position, a first rated time is preset. When the bottom plate 3 stays at the lowest position for the first rated time, the bottom plate 3 starts to rise. During the rising process, the bottom plate 3 can also scrape off the solids attached to the inner wall of the processing tank 1. During the rising process of the bottom plate 3, the bottom plate 3 pushes the scraper 21 at the bottom of the stirring unit 2 to rise together. The lower part of the scraper 21 is completely matched with the upper end surface of the bottom plate 3. When the bottom plate 3 rises to the highest position, the upper end surface of the bottom plate 3 is coplanar with the lower end surface of the discharge port 11. At the same time, the stirring unit 2 is continuously in a rotating state. The stirring unit 2 drives the scraper 21 to rotate. The rotating scraper 21 scrapes the upper end surface of the bottom plate 3 at the highest position. Sweep, so that the sediment accumulated on the bottom plate 3 can be discharged through the discharge port 11, and the bottom plate 3 is preset with a second rated time when it is at the highest position. When the bottom plate 3 stays at the highest position for the second rated time, the bottom plate 3 begins to descend, so that the processing tank 1 can realize the function of self-cleaning the sediment at the bottom of itself. At the same time, since the cleaning time is short, the feeding unit 4 has the function of storing waste liquid during cleaning. The feeding unit 4 can store in advance when the processing tank 1 is self-cleaning. After cleaning, the bottom plate 3 descends, and the feeding unit 4 feeds the waste liquid. Therefore, there is no need to suspend the wastewater treatment device during self-cleaning, which not only realizes self-cleaning but also ensures the wastewater treatment efficiency.

[0034] Reference Figure 1-Figure 10 : The bottom plate 3 is a rotating body structure, the horizontal cross-sectional area of ​​the upper part of the bottom plate 3 is smaller than the horizontal cross-sectional area of ​​the lower part of the bottom plate 3, the upper end face of the bottom plate 3 is an inclined structure, and the inclined structure is inclined downward from the axis side of the bottom plate 3 toward the outer periphery of the bottom plate 3, and the lower part of the scraper 21 fits with the upper end face of the bottom plate 3.

[0035] Since the upper part of the bottom plate 3 is an inclined structure, when the bottom plate 3 is lifted and lowered in the treatment tank 1 along the vertical direction, after the bottom plate 3 reaches the highest position, the sediment accumulated on the bottom plate 3 can be discharged along the inclined direction of the upper part of the bottom plate 3. At the same time, after the bottom plate 3 reaches the highest position, the scraper 21 located on the bottom plate 3 can also rotate around the axis of the treatment tank 1 driven by the stirring unit 2. The scraper 21 completely sweeps the upper end surface of the bottom plate 3 during the rotation. In this way, the scraper 21 forms a sweeping area during the rotation, and the sweeping area completely covers the upper part of the bottom plate 3. In this way, the sediment accumulated on the bottom plate 3 can be cleaned out, thereby realizing the self-cleaning function of the wastewater treatment device.

[0036] Reference Figure 1-Figure 10 : The bottom plate 3 moves back and forth along the axial direction of the processing tank 1. The time when the bottom plate 3 is at the lowest position is preset to a first rated time, and the time when the bottom plate 3 is at the highest position is preset to a second rated time. The bottom plate 3 starts to rise when it stays at the lowest position for the first rated time, and starts to descend when the bottom plate 3 stays at the highest position for the second rated time.

[0037] The first rated time preset for the bottom plate 3 starts to be calculated from the time when the bottom plate 3 drops to the lowest position. At the same time, the second rated time preset for the bottom plate 3 starts to be calculated from the time when the bottom plate 3 rises to the highest position. The first rated time is greater than the second rated time. This is because when the bottom plate 3 is at the lowest position, the processing tank 1 is in a waste liquid processing state, and the reaction time of the waste liquid will obviously be longer than the time for cleaning the upper end surface of the bottom plate 3. In this way, setting the first rated time greater than the second rated time can ensure that the waste liquid reacts fully in the processing tank 1.

[0038] Reference Figure 3-Figure 5 A feeding unit 4 is arranged at the upper part of the processing tank 1, and the feeding unit 4 includes a temporary storage bin 41, which is used to pre-store the waste liquid discharged into the processing tank 1. A switch valve 42 is arranged at the bottom of the temporary storage bin 41. When the bottom plate 3 descends from the highest position, the switch valve 42 opens.

[0039] In this way, when the scraper 21 cleans the bottom plate 3, the waste liquid still flows continuously to the treatment tank 1. In order to avoid the accidental discharge of the waste liquid from the discharge port 11, when the bottom plate 3 is at the highest position, the switch valve 42 is not opened. Of course, there are still exceptions, which will be explained below. When the bottom plate 3 stays at the highest position for the second rated time, the bottom plate 3 begins to descend and the switch valve 42 is opened.

[0040] Reference Figure 5A float 43 is provided in the temporary storage bin 41 for movement in the vertical direction, and a trigger button 44 is provided directly above the float 43. When waste liquid is injected into the temporary storage bin 41, the float 43 rises in the vertical direction. After the float 43 rises, the trigger button 44 can be triggered, and the switch valve 42 is activated and opened by one quarter. The activation command of the trigger button 44 to the switch valve 42 has the highest priority.

[0041] In the process of arsine production, the waste liquid generated cannot be maintained at a constant value, which will lead to insufficient volume of the temporary storage bin 41. In order to avoid the temporary storage bin 41 being full, a float 43 and a trigger button 44 are provided in the temporary storage bin 41. When the float 43 presses the trigger button 44, the float 43 floats on the surface of the waste liquid in the temporary storage bin 41. Thus, the temporary storage bin 41 is not fully filled at this time, and there is still a certain distance between the liquid level in the temporary storage bin 41 and the top of the temporary storage bin 41. The trigger button 44 is opened to allow operating time for the switch valve 42 to open. It is worth noting that the switch valve 42 activated by the trigger button 44 can only be opened by a quarter, and will be opened regardless of whether the bottom plate 3 is in the highest position at this time. The opened switch valve 42 can reduce the pressure of the waste liquid pre-stored in the temporary storage bin 41. At the same time, the switch valve 42 is only opened by a quarter to avoid more waste liquid falling on the bottom plate 3 when the bottom plate 3 is in the highest position, thereby preventing the sediment on the bottom plate 3 from being cleaned up in time and the waste liquid from being discharged through the discharge port 11.

[0042] Reference Figure 2 , Figure 5 and Figure 6 The stirring unit 2 includes a plurality of telescopic rods 22, which are arranged in the processing tank 1 along the axis of the processing tank 1, and adjacent telescopic rods 22 are mutually sleeved and slidably matched in the vertical direction, and adjacent telescopic rods 22 are key-connected, and each telescopic rod 22 is provided with a stirring rod 23. The plurality of telescopic rods 22 located in the processing tank 1 form a driving part, and a first driving unit 24 is provided on the upper part of the driving part. The first driving unit 24 is used to drive the telescopic rods 22 to rotate, and can push the telescopic rods 22 to retract when the bottom plate 3 rises, and after the bottom plate 3 reaches the highest position, all the telescopic rods 22 are retracted to the shortest state.

[0043] The first driving unit 24 includes a first gear ring 241, a first gear 242 and a first rotation driver 243. The first gear ring 241 is fixedly sleeved on the upper part of the driving part. The first gear 242 is rotatably provided on one side of the first gear ring 241. The first gear ring 241 and the first gear 242 are meshed with each other. The first rotation driver 243 is provided at the end of the first gear 242. The first rotation driver 243 is used to drive the first gear 242 to rotate. The first rotation driver 243 is preferably a servo motor. The scraper 21 is fixedly provided at the bottom of the telescopic rod 22 located at the lowest layer. When stirring is required, the first rotation driver 243 is started and drives the first gear ring 241 to rotate through the first gear 242, thereby rotating the driving part, that is, rotating all the telescopic rods 22. When the processing tank 1 is self-cleaning, the driving part is continuously in a rotating state, and at this time the telescopic rod 22 is fully retracted, and the scraper 21 contacts the upper part of the bottom plate 3, so that the scraper 21 can continuously clean the upper end surface of the bottom plate 3.

[0044] Reference Figure 2 and Figure 3 A ventilation groove 25 is provided in the vertical direction on the driving part formed by the telescopic rod 22, and an air pump 26 is provided on the upper part of the ventilation groove 25. The air pump 26 inflates the ventilation groove 25 when the base plate 3 descends, and disconnects from the ventilation groove 25 when the base plate 3 descends to the lowest position.

[0045] When the bottom plate 3 descends, the ventilation groove 25 is inflated by the air pump 26, so that the bottom of the telescopic rod 22 can be completely pressed on the bottom plate 3, ensuring that the telescopic rod 22 is continuously in a stretched state. Under the action of the air pump 26, when the bottom of the telescopic rod 22 located at the bottom layer is separated from the bottom plate 3, the telescopic rod 22 arranged in the processing tank 1 is extended to the longest state, and then the air pump 26 is disconnected from the ventilation groove 25, so that the ventilation groove 25 is air-locked, so that the adjacent telescopic rods 22 will not slide relative to each other during the stirring process of the telescopic rods 22. When the bottom plate 3 rises from the lowest position, the air pump 26 connects the ventilation groove 25 with the outside world, and the bottom plate 3 can smoothly push the telescopic rod 22 to retract.

[0046] Reference Figure 3 , Figure 4 and Figure 7 A collecting unit 5 is arranged on the periphery of the processing tank 1, and the collecting unit 5 is used for collecting the sediment discharged from the discharge port 11. The collecting unit 5 includes an outer shell 52 which is sleeved on the periphery of the processing tank 1, and there is an annular gap between the outer shell 52 and the processing tank 1. A collecting box 51 is slidably arranged in the vertical direction on the annular gap, and a second driving unit 53 for driving the collecting box 51 to move in the vertical direction is arranged at the lower part of the collecting box 51. The collecting box 51 and the outer shell 52 together form a collecting trough.

[0047] The collecting tank collects the sediment. The second driving unit 53 includes a second rotating driver 531, a second gear 532, a second gear ring 533, a third gear ring 534, a fixing frame 535 and a screw rod 536. A fixing frame 535 is arranged at the lower part of the collecting box 51. A discharge port 54 is provided on the side wall of the outer shell 52. The fixing frame 535 is located below the discharge port 54. The fixing frame 535 is fixedly connected to the outer shell 52. The screw rod 536 passes through the fixing frame 535 in the vertical direction and is key-connected to the fixing frame 535. The screw rod 536 and the fixing frame 535 are slidably matched in the vertical direction. A plurality of screw rods 536 are arranged. The screw rods 536 are evenly distributed on the fixing frame 535 around the axis of the processing tank 1. A second gear ring 533 is sleeved on the screw rod 536. The second gear ring 533 and the screw rod 536 are connected to the screw rod 536. The third gear ring 534 is threadedly matched, and the outer ring of the second gear ring 533 is sleeved with a third gear ring 534. The inner ring and the outer ring of the third gear ring 534 are distributed with meshing teeth. A second gear 532 is arranged on one side of the outer periphery of the third gear ring 534. The second rotation driver 531 is arranged at the end of the second gear 532. The second rotation driver 531 is used to drive the second gear 532 to rotate. The upper part of the screw rod 536 is connected to the bottom of the collecting box 51. The second gear ring 533 is rotatably set at the lower part of the fixing frame 535, and the second gear ring 533 will not move in the vertical direction. Since the second gear ring 533 is threadedly matched with the screw rod 536, and the fixing frame 535 has a limiting effect on the screw rod 536, that is, when the second gear ring 533 rotates, the screw rod 536 can only move in the vertical direction, thereby realizing the driving of the collecting box 51 to rise and fall.

[0048] Reference Figure 8 : A discharge port 54 is provided on the side wall of the outer shell 52, and the discharge port 54 is lower than the discharge port 11. When the collecting box 51 moves in the vertical direction, it has a first stop position and a second stop position, and the first stop position and the second stop position are distributed from top to bottom in the vertical direction. When the collecting box 51 is located at the first stop position, the collecting box 51 is located on the horizontal side of the discharge port 11 and forms a collecting groove with the outer shell 52. When the collecting box 51 is located at the second stop position, the collecting box 51 is located on the horizontal side of the discharge port 54, and the collecting groove disappears.

[0049] That is, the collecting trough is composed of the collecting box 51 and the inner wall of the outer shell 52. When the collecting box 51 descends to the second stop position, the collecting trough disappears. When the collecting box 51 descends to the second stop position, the staff can remove the sediment on the collecting box 51, or the sediment on the collecting box 51 can be removed by a manipulator. The stop time of the collecting trough at the first stop position can be preset according to actual conditions.

[0050] Reference Figure 3 and Figure 4 A fan 55 is provided at the upper portion of the housing 52 , one side of the fan 55 is connected to an air filter, and the fan 55 is used to extract the exhaust gas in the treatment tank 1 .

[0051] A reversing valve 56 is arranged on the side wall of the treatment tank 1. The reversing valve 56 is a two-position two-way type, which is connected to the outside air and the chemical agent to be put into the treatment tank 1 respectively. When the waste liquid is just put into the treatment tank 1, the reversing valve 56 is switched to a position connected with the chemical agent, and the chemical agent is put into the treatment tank 1. After the chemical agent is put into, the reversing valve 56 is reversed, and the fan 55 is started at the same time. The fan 55 extracts the gas in the treatment tank 1, and the reversing valve 56 supplies the outside air into the treatment tank 1, so that the waste gas generated by the chemical reaction in the treatment tank 1 can be discharged into the air filter in time, avoiding the waste gas leakage from the discharge port 54 when the collecting box 51 descends to the position of the discharge port 54, that is, when the collecting box 51 is located at the second stop position.

[0052] Working principle: a fixed amount of waste liquid and a corresponding proportion of chemical agents are put into the treatment tank 1. At this time, the bottom plate 3 is in the lowest position. Then the stirring unit 2 in the treatment tank 1 starts to stir, and the scraper 21 arranged at the bottom of the stirring unit 2 rotates synchronously with the stirring unit 2. At this time, the lower part of the scraper 21 is in a non-contact state with the upper part of the bottom plate 3, so that the scraper 21 will not lift up the sediment deposited on the bottom plate 3 when rotating with the stirring unit 2. When the bottom plate 3 is in the lowest position, the straight-line distance between the scraper 21 and the bottom plate 3 in the vertical direction needs to be determined according to the actual situation, that is, when the scraper 21 rotates, it will not lift up the sediment on the bottom plate 3 when it is in the lowest position. In this way, it is ensured that the sediment can be stably settled to the bottom of the treatment tank 1 and be received by the bottom plate 3.

[0053] When the bottom plate 3 is at the lowest position, a first rated time is preset. When the bottom plate 3 stays at the lowest position for the first rated time, the bottom plate 3 starts to rise. During the rising process, the bottom plate 3 can also scrape off the solids attached to the inner wall of the processing tank 1. During the rising process of the bottom plate 3, the bottom plate 3 pushes the scraper 21 at the bottom of the stirring unit 2 to rise together. The lower part of the scraper 21 is completely matched with the upper end surface of the bottom plate 3. When the bottom plate 3 rises to the highest position, the upper end surface of the bottom plate 3 is coplanar with the lower end surface of the discharge port 11. At the same time, the stirring unit 2 is continuously in a rotating state. The stirring unit 2 drives the scraper 21 to rotate. The rotating scraper 21 scrapes the upper end surface of the bottom plate 3 at the highest position. Sweep, so that the sediment accumulated on the bottom plate 3 can be discharged through the discharge port 11, and the bottom plate 3 is preset with a second rated time when it is at the highest position. When the bottom plate 3 stays at the highest position for the second rated time, the bottom plate 3 begins to descend, so that the processing tank 1 can realize the function of self-cleaning the sediment at the bottom of itself. At the same time, since the cleaning time is short, the feeding unit 4 has the function of storing waste liquid during cleaning. The feeding unit 4 can store in advance when the processing tank 1 is self-cleaning. After cleaning, the bottom plate 3 descends, and the feeding unit 4 feeds the waste liquid. Therefore, there is no need to suspend the wastewater treatment device during self-cleaning, which not only realizes self-cleaning but also ensures the wastewater treatment efficiency.

[0054] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A multi-stage treatment device for wastewater used in arsine production, comprising a treatment tank (1) and a stirring unit (2) arranged in the treatment tank (1); It is characterized in that A discharge port (11) is provided on the side wall of the processing tank (1). The processing tank (1) is of a cylindrical structure. A bottom plate (3) is slidably arranged in the processing tank (1) along the axial direction of the processing tank (1). A plurality of filter holes are evenly and vertically penetrated on the bottom plate (3). The bottom plate (3) has a lowest position and a highest position when moving in the vertical direction. When the bottom plate (3) is at the lowest position, the bottom plate (3) is located at the bottom of the processing tank (1). When the bottom plate (3) is at the highest position, the upper end of the bottom plate (3) is The bottom plate (3) is coplanar with the lower end surface of the discharge port (11); a scraper (21) is provided at the bottom of the stirring unit (2) along the radial direction of the processing tank (1); the scraper (21) rotates synchronously with the stirring unit (2); when the bottom plate (3) is at the lowest position, the upper part of the bottom plate (3) and the scraper (21) are in a non-contact state; when the bottom plate (3) rises from the lowest position to the highest position, the bottom plate (3) contacts the scraper (21) and can drive the scraper (21) to rise synchronously until the bottom plate (3) reaches the highest position and stops moving.

2. The multi-stage treatment device for wastewater from arsine production according to claim 1, characterized in that: The bottom plate (3) is a rotating body structure, the horizontal cross-sectional area of ​​the upper portion of the bottom plate (3) is smaller than the horizontal cross-sectional area of ​​the lower portion of the bottom plate (3), the upper end surface of the bottom plate (3) is an inclined structure, and the inclined structure is inclined downward from one side of the axis of the bottom plate (3) toward the outer periphery of the bottom plate (3), and the lower portion of the scraper (21) is in contact with the upper end surface of the bottom plate (3).

3. The multi-stage treatment device for wastewater from arsine production according to claim 1, characterized in that: The bottom plate (3) reciprocates along the axial direction of the processing tank (1); the time the bottom plate (3) is at the lowest position is preset to a first rated time, and the time the bottom plate (3) is at the highest position is preset to a second rated time; the bottom plate (3) starts to rise when it stays at the lowest position for the first rated time, and starts to descend when it stays at the highest position for the second rated time.

4. The multi-stage treatment device for wastewater from arsine production according to claim 1, characterized in that: A feeding unit (4) is arranged at the upper part of the processing tank (1), and the feeding unit (4) comprises a temporary storage bin (41). The temporary storage bin (41) is used to pre-store waste liquid discharged into the processing tank (1). A switch valve (42) is arranged at the bottom of the temporary storage bin (41). When the bottom plate (3) descends from the highest position, the switch valve (42) opens.

5. The multi-stage treatment device for wastewater from arsine production according to claim 4, characterized in that: A float (43) is arranged to move in the temporary storage bin (41) in a vertical direction, and a trigger button (44) is arranged directly above the float (43). When waste liquid is injected into the temporary storage bin (41), the float (43) rises in the vertical direction. After the float (43) rises, the trigger button (44) can be triggered, and the switch valve (42) is activated and opened by one quarter. The activation command of the trigger button (44) to the switch valve (42) has the highest priority.

6. The multi-stage treatment device for wastewater from arsine production according to claim 1, characterized in that: The stirring unit (2) comprises a plurality of telescopic rods (22), the telescopic rods (22) being arranged in the processing tank (1) along the axis of the processing tank (1), and adjacent telescopic rods (22) being mutually sleeved and slidingly matched in the vertical direction, and adjacent telescopic rods (22) being connected, and each telescopic rod (22) being provided with a stirring rod (23), and the plurality of telescopic rods (22) located in the processing tank (1) forming a driving part, and a first driving unit (24) being provided on the upper part of the driving part, and the first driving unit (24) being used for driving the telescopic rods (22) to rotate, and being able to push the telescopic rods (22) to retract when the bottom plate (3) rises, and after the bottom plate (3) reaches the highest position, all the telescopic rods (22) are retracted to the shortest state.

7. The multi-stage treatment device for wastewater from arsine production according to claim 6, characterized in that: A ventilation groove (25) is provided in the vertical direction on the driving portion formed by the telescopic rod (22), and an air pump (26) is provided on the upper part of the ventilation groove (25). The air pump (26) inflates the ventilation groove (25) when the bottom plate (3) descends, and disconnects from the ventilation groove (25) when the bottom plate (3) descends to the lowest position.

8. The multi-stage treatment device for wastewater from arsine production according to claim 1, characterized in that: A collecting unit (5) is arranged on the periphery of the processing tank (1), and the collecting unit (5) is used to collect sediment discharged from the discharge port (11). The collecting unit (5) comprises an outer shell (52) sleeved on the periphery of the processing tank (1), an annular gap is present between the outer shell (52) and the processing tank (1), a collecting box (51) is slidably arranged in a vertical direction on the annular gap, and a second driving unit (53) is arranged at the bottom of the collecting box (51) for driving the collecting box (51) to move in a vertical direction, and the collecting box (51) and the outer shell (52) together form a collecting tank.

9. The multi-stage treatment device for wastewater from arsine production according to claim 8, characterized in that: A discharge port (54) is provided on the side wall of the outer shell (52), the discharge port (54) being lower than the discharge port (11), and the collection box (51) having a first stop position and a second stop position when moving in the vertical direction, the first stop position and the second stop position being distributed from top to bottom in the vertical direction, when the collection box (51) is located at the first stop position, the collection box (51) is located at a horizontal side of the discharge port (11) and forms a collection groove with the outer shell (52), and when the collection box (51) is located at the second stop position, the collection box (51) is located at a horizontal side of the discharge port (54) and the collection groove disappears.

10. The multi-stage treatment device for wastewater from arsine production according to claim 8, characterized in that: A fan (55) is arranged on the upper part of the housing (52), and one side of the fan (55) is connected to an air filter. The fan (55) is used to extract the waste gas in the treatment tank (1).

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