A multi-stage wastewater treatment device for arsine production

Abstract

The present application relates to wastewater treatment field, specifically is related to a kind of arsenic alkane production wastewater multistage processing device, including treatment tank and be set in stirring unit in treatment tank;Discharge port is opened on the lateral wall of treatment tank, treatment tank is cylindrical structure, slidingly arranged with bottom plate in the axial direction of treatment tank in treatment tank, multiple filter holes are evenly vertically penetrated and arranged on the bottom plate, bottom plate has lowest position and highest position when moving in vertical direction, bottom plate is located at the bottom of treatment tank when bottom plate is located at lowest position, the upper end surface of bottom plate is coplanar with the lower end surface of discharge port when bottom plate is located at highest position, scraper is arranged in the radial direction of treatment tank in the bottom of stirring unit, scraper rotates synchronously with stirring unit, the upper portion of bottom plate is in non-contact state with scraper when bottom plate is located at lowest position.The present application realizes self-cleaning and guarantees wastewater treatment efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the field of wastewater treatment, in particular to a multi-stage wastewater treatment device for arsenic production. BACKGROUND

[0002] In the preparation process of arsenic, a reaction kettle is needed for preparation, and arsenic salt solution is generated in the preparation process. The arsenic salt as the residual liquid of the reaction kettle 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, so that the arsenic in the arsenic salt solution is separated by distillation, and the separated arsenic is blown away by nitrogen. Then, the residual liquid is discharged as waste liquid after passing through an adsorption tower and a rectifying tower. The waste liquid contains zinc sulfate, sulfuric acid, zinc oxide, arsenic and water, and needs 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 when the arsenic-containing wastewater in the first water tank reaches a set liquid level, a first stirrer starts to stir, and at the same time, an iron chelating agent, a flocculant and an alkaline pH value regulator are added, the flocculant is used for flocculation, and the alkaline pH value regulator is used for adjusting the pH value of the arsenic-containing wastewater to a set value, and after sufficient reaction, the waste liquid is obtained after preliminary treatment; step 2, the waste liquid after preliminary treatment is pumped into a first filter for filtration, and the filtrate after filtration is introduced into a second water tank, and the filter residue is intercepted in the first filter; step 3, when the filtrate in the second water tank reaches a set liquid level, a second stirrer is started, and at the same time, an iron chelating agent, a flocculant and an alkaline pH value regulator are added, the flocculant is used for flocculation, and the alkaline pH value regulator is used for adjusting the pH value of the arsenic-containing wastewater to a set value, and the filtrate after secondary treatment is obtained; step 4, the filtrate after secondary treatment is pumped into a second filter for filtration, and the filtrate after filtration is introduced into a third water tank, and the filter residue is intercepted 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 returned to step 1 for re-execution, otherwise, the pH value is adjusted to a set value and discharged.

[0004] The above scheme gives a method for treating wastewater containing arsenic, but a device for discharging the corresponding precipitate in each process is not provided. The traditional multi-stage wastewater treatment is formed by connecting a plurality of wastewater treatment tanks in series. The precipitate after reaction is accumulated at the bottom of the wastewater treatment tank and cannot be discharged. After a long time of use, a large amount of precipitate is inevitably accumulated at the bottom of the wastewater treatment tank. At the same time, the tank body needs to be stirred during the treatment of wastewater. The excessive precipitate at the bottom of the tank body is stirred and raised, which seriously affects the treatment effect of the waste liquid. In order to avoid the above situation, the tank body needs to be manually cleaned, which is difficult and laborious. SUMMARY

[0005] In order to solve the above problems, the application provides a multi-stage wastewater treatment device for arsine production, which comprises a treatment tank and a stirring unit arranged in the treatment tank; a discharge port is arranged on the side wall of the treatment tank, the treatment tank is in a cylindrical structure, a bottom plate is arranged in the treatment tank and slides along the axis of the treatment tank, a plurality of filter holes are vertically and uniformly arranged 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 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 arranged at the bottom of the stirring unit and rotates along the radial direction of the treatment tank, the upper part of the bottom plate is in a non-contact state with the scraper when the bottom plate is at the lowest position, the bottom plate is in contact with the scraper when the bottom plate rises from the lowest position to the highest position, and the scraper is driven to rise synchronously until the bottom plate stops moving when reaching the highest position.

[0006] In order to solve the above problems, the application provides a multi-stage wastewater treatment device for arsine production, which comprises a treatment tank and a stirring unit arranged in the treatment tank; a discharge port is arranged on the side wall of the treatment tank, the treatment tank is in a cylindrical structure, a bottom plate is arranged in the treatment tank and slides along the axis of the treatment tank, a plurality of filter holes are vertically and uniformly arranged 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 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 arranged at the bottom of the stirring unit and rotates along the radial direction of the treatment tank, the upper part of the bottom plate is in a non-contact state with the scraper when the bottom plate is at the lowest position, the bottom plate is in contact with the scraper when the bottom plate rises from the lowest position to the highest position, and the scraper is driven to rise synchronously until the bottom plate stops moving when reaching the highest position.

[0007] Preferably, the bottom plate is in a rotary body structure, the horizontal cross-sectional area of the upper part of the bottom plate is smaller than that of the lower part of the bottom plate, the upper end surface of the bottom plate is in an inclined structure, and the inclined structure inclines downward from one side of the axis of the bottom plate to the outer periphery of the bottom plate, and the lower part of the scraper is in engagement with the upper end surface of the bottom plate.

[0008] Preferably, the bottom plate reciprocally moves along the axis of the treatment tank, the time for the bottom plate to stay at the lowest position is preset as a first rated time, the time for the bottom plate to stay at the highest position is preset as a second rated time, the bottom plate starts to rise when staying at the lowest position for the first rated time, and the bottom plate starts to descend when staying at the highest position for the second rated time.

[0009] Preferably, a feeding unit is arranged at the upper part of the treatment tank, the feeding unit comprises a temporary storage bin, the temporary storage bin is used for pre-storing the waste liquid discharged into the treatment tank, and a switch valve is arranged at the bottom of the temporary storage bin, the switch valve is opened when the bottom plate descends from the highest position.

[0010] Preferably, a float is arranged in the temporary storage bin and moves in the vertical direction, a trigger button is arranged directly above the float, the float rises in the vertical direction when the waste liquid is injected into the temporary storage bin, the trigger button is triggered after the float rises, the switch valve is activated and opened by one quarter, and the activation command of the trigger button to the switch valve is in the highest priority.

[0011] Preferably, the stirring unit comprises a plurality of telescopic rods arranged in the processing tank along the axis of the processing tank, and the adjacent telescopic rods are sleeved with each other and are slidingly connected in the vertical direction, and the adjacent telescopic rods are connected, the stirring rod is arranged on each telescopic rod, the plurality of telescopic rods in the processing tank form a driving part, the upper part of the driving part is provided with a first driving unit, the first driving unit is used for driving the telescopic rod to rotate, the bottom plate is lifted to push the telescopic rod to shrink, and after the bottom plate reaches the highest position, all the telescopic rods are shrunk to the shortest state.

[0012] Preferably, the driving part formed by the telescopic rods is provided with a ventilation groove in the vertical direction, and the upper part of the ventilation groove is provided with an air pump, the air pump is inflated in the ventilation groove when the bottom plate is lowered, and the air pump is disconnected with the ventilation groove when the bottom plate is lowered to the lowest position.

[0013] Preferably, the collecting unit is arranged on the periphery of the processing tank, the collecting unit is used for collecting the precipitate discharged from the discharge port, the collecting unit comprises a shell sleeved on the periphery of the processing tank, and an annular gap is arranged between the shell and the processing tank, a collecting box is slidingly arranged in the annular gap in the vertical direction, a second driving unit is arranged on the lower part of the collecting box and is used for driving the collecting box to move in the vertical direction, and the collecting box and the shell jointly form a collecting groove.

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

[0015] Preferably, the fan is arranged on the upper part of the shell, and the air filter is communicated with one side of the fan, and the fan is used for extracting the waste gas in the processing tank.

[0016] The beneficial effects of the present application compared with the prior art are:

[0017] 1. A measured amount of waste liquid and a corresponding proportion of chemical reagents are added to the treatment tank. At this point, the bottom plate is in its lowest position. The stirring unit inside the tank then begins stirring. The scraper located at the bottom of the stirring unit rotates synchronously with the stirring unit. The lower part of the scraper is not in contact with the upper part of the bottom plate, thus preventing the scraper from stirring up the sediment on the bottom plate as it rotates with the stirring unit. A first preset time is allowed when the bottom plate is in its lowest position. When the bottom plate has remained in this position for the first preset time, it begins to rise. During this rising process, the bottom plate scrapes off any solid matter adhering to the inner wall of the treatment tank. Furthermore, during the rising process, the bottom plate stirs the... The scraper at the bottom of the mixing unit rises together with the bottom plate, with the lower part of the scraper completely fitting the upper surface of the bottom plate. When the bottom plate rises to its highest position, the upper surface of the bottom plate is coplanar with the lower surface of the discharge port. At the same time, the mixing unit continues to rotate, driving the scraper to rotate. The rotating scraper sweeps the upper surface of the bottom plate at its highest position, so that the sediment accumulated on the bottom plate can be discharged through the discharge port. The bottom plate has a preset second rated time when it is at its highest position. After the bottom plate stays at the highest position for the second rated time, it begins to descend. This realizes the function of the treatment tank to self-clean the sediment at its bottom.

[0018] 2. During the cleaning process, the feeding unit has a waste liquid storage function. 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 the waste liquid in. Therefore, the wastewater treatment device does not need to be stopped during self-cleaning, which achieves both self-cleaning and wastewater treatment efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a multi-stage wastewater treatment device for arsine production.

[0020] Figure 2 This is a side view of a multi-stage wastewater treatment device for arsine production.

[0021] Figure 3 A multi-stage wastewater treatment device for arsine production. Figure 2 Schematic diagram of cross-section at point AA.

[0022] Figure 4 A cross-sectional three-dimensional schematic diagram of a multi-stage wastewater treatment device for arsine production. Figure 1 .

[0023] Figure 5 A multi-stage wastewater treatment device for arsine production. Figure 4 A magnified view of a portion of point B in the middle.

[0024] Figure 6 A multi-stage wastewater treatment device for arsine production.Figure 4 Partial enlarged view at C.

[0025] Figure 7 A multi-stage wastewater treatment device for arsine production Figure 4 Partial enlarged view at D.

[0026] Figure 8 A cutaway perspective view of a multi-stage wastewater treatment device for arsine production Figure 2 .

[0027] Figure 9 A multi-stage wastewater treatment device for arsine production Figure 8 Partial enlarged view at E.

[0028] Figure 10 A cutaway perspective view of a multi-stage wastewater treatment device for arsine production when the bottom plate is in a cleaning state

[0029] Reference numerals in the figure are:

[0030] 1, treatment tank; 11, discharge port; 2, stirring unit; 21, scraper; 22, telescopic rod; 23, stirring rod; 24, first driving unit; 241, first tooth ring; 242, first gear; 243, first rotary driver; 25, air passage; 26, air pump; 3, bottom plate; 31, winder; 32, traction rope; 4, feeding unit; 41, temporary storage bin; 42, on-off valve; 43, float; 44, trigger button; 5, collection unit; 51, collection box; 52, outer shell; 53, second driving unit; 531, second rotary driver; 532, second gear; 533, second tooth ring; 534, third tooth ring; 535, fixing frame; 536, lead screw; 54, discharge port; 55, fan; 56, reversing valve. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in conjunction with the drawings and specific embodiments.

[0032] Reference is made to Figures 1-4 , Figure 8 and Figure 9The application discloses a multi-stage wastewater treatment device for arsine production, which comprises a treatment tank 1 and a stirring unit 2 arranged in the treatment tank 1; a discharge port 11 is formed in the side wall of the treatment tank 1, the treatment tank 1 has a cylindrical structure, a bottom plate 3 is arranged in the treatment tank 1 and slides along the axial direction of the treatment tank 1, a plurality of filter holes are vertically and uniformly formed in 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 located at the lowest position, the bottom plate 3 is located at the bottom of the treatment tank 1, when the bottom plate 3 is located 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 arranged at the bottom of the stirring unit 2 and in the radial direction of the treatment tank 1, the scraper 21 rotates synchronously with the stirring unit 2, when the bottom plate 3 is located 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 is in contact with the scraper 21 and can drive the scraper 21 to synchronously rise until the bottom plate 3 stops moving when reaching the highest position.

[0033] The common multi-stage wastewater treatment method is to arrange a plurality of treatment tanks 1 and connect all the treatment tanks 1 in series, when treating wastewater, the wastewater for producing arsine sequentially passes through the treatment tanks 1 arranged in series, a plurality of discharge ports 11 are arranged on the side wall of the treatment tank 1 and uniformly distributed around the axial line of the treatment tank 1, a feeding unit 4 is arranged at the upper part of the treatment tank 1 and used for feeding waste liquid into the treatment tank 1 from the upper part of the treatment tank 1 for treatment, a liquid discharge port is arranged 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 meeting the discharge standard is discharged, in the above treatment process, different chemical agents need to be fed into 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 harmful substances, some of the harmful substances are discharged in the form of gas, and some are converted into precipitates and precipitated at the bottom of the treatment tank 1, the precipitates precipitated at the bottom of the treatment tank 1 cannot be discharged by the device itself, but need to be cleaned by human beings regularly, so the work is heavy, and the wastewater treatment efficiency is low because the treatment tank 1 needs to be in a stop running state during cleaning.

[0034] In order to avoid the above problems, the inside of the treatment tank 1 is redesigned, and the specific structure and working principle are as follows: a winding device 31 is arranged on the upper part of the bottom plate 3, and a traction rope 32 is wound in the winding device 31. The traction rope 32 is fixedly connected with the upper part of the bottom plate 3 after being unwound from the winding device 31. The bottom plate 3 is in a vertical sliding fit with the treatment tank 1. A certain amount of waste liquid and a corresponding proportion of chemical agent are poured 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. 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. In this way, the scraper 21 will not lift the precipitate on the bottom plate 3 when it rotates 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, the scraper 21 will not lift the precipitate on the bottom plate 3 when it is in the lowest position. In this way, it is ensured that the precipitate can be stably precipitated to the bottom of the treatment tank 1 and be received by the bottom plate 3.

[0035] The bottom plate 3 is preset with a first rated time when it is in the lowest position. When the time that the bottom plate 3 stays in the lowest position reaches the first rated time, the bottom plate 3 starts to rise. The bottom plate 3 can also scrape off the solid substances attached to the inner wall of the treatment tank 1 during the rising process of the bottom plate 3. During the rising process of the bottom plate 3, the bottom plate 3 lifts the scraper 21 at the bottom of the stirring unit 2 together. The lower part of the scraper 21 is completely fitted 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 this time. At the same time, the stirring unit 2 continues to be in a rotating state. The stirring unit 2 drives the scraper 21 to rotate. The scraper 21 in rotation sweeps the upper end surface of the bottom plate 3 in the highest position. In this way, the precipitate accumulated on the bottom plate 3 can be discharged through the discharge port 11. The bottom plate 3 is preset with a second rated time when it is in the highest position. When the time that the bottom plate 3 stays in the highest position reaches the second rated time, the bottom plate 3 starts to descend. In this way, the function that the treatment tank 1 can self-clean the precipitate at the bottom of the treatment tank 1 is realized. At the same time, since the cleaning time is relatively short, the feeding unit 4 has the function of waste liquid storage while cleaning. The feeding unit 4 can store in advance when the treatment tank 1 is self-cleaning. After cleaning, the bottom plate 3 descends, and the feeding unit 4 pours the waste liquid. Therefore, it is not necessary to suspend the waste water treatment device when self-cleaning. Both self-cleaning and waste water treatment efficiency are ensured.

[0036] Referring to Figures 1-10 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 that of the lower part of the bottom plate 3. The upper end surface of the bottom plate 3 is in an inclined structure. The inclined structure inclines downward from the axis of the bottom plate 3 to the outer periphery of the bottom plate 3. The lower part of the scraper 21 is fitted with the upper end surface of the bottom plate 3.

[0037] Due to the inclined structure of the upper portion of the bottom plate 3, when the bottom plate 3 is lifted along the vertical direction in the treatment tank 1, the precipitate accumulated on the bottom plate 3 can be discharged along the inclined direction of the upper portion of the bottom plate 3 after the bottom plate 3 reaches the highest position. Meanwhile, the scraper 21 on the bottom plate 3 can also rotate around the axis of the treatment tank 1 under the driving of the stirring unit 2 after the bottom plate 3 reaches the highest position. The scraper 21 completely sweeps the upper end face of the bottom plate 3 during the rotation, so that the scraper 21 forms a sweeping area during the rotation, which completely covers the upper portion of the bottom plate 3. Thus, the precipitate accumulated on the bottom plate 3 can be cleaned out, realizing the self-cleaning function of the wastewater treatment device.

[0038] Referring to Figures 1-10 : The bottom plate 3 reciprocates along the axis direction of the treatment tank 1. The time for the bottom plate 3 to stay at the lowest position is preset as a first rated time, and the time for the bottom plate 3 to stay at the highest position is preset as 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.

[0039] The time for the first rated time of the bottom plate 3 to start counting is calculated from the time when the bottom plate 3 descends to the lowest position, and the time for the second rated time of the bottom plate 3 to start counting is 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, because the treatment tank 1 is in the state of treating waste liquid when the bottom plate 3 is at the lowest position, and the reaction time of the waste liquid is obviously longer than the time for cleaning the upper end face of the bottom plate 3. Therefore, the first rated time is set to be greater than the second rated time, so as to ensure that the waste liquid is fully reacted in the treatment tank 1.

[0040] Referring to Figures 3-5 : A feeding unit 4 is arranged at the upper portion of the treatment tank 1. The feeding unit 4 includes a temporary storage bin 41 for pre-storing the waste liquid discharged into the treatment tank 1. A switch valve 42 is arranged at the bottom of the temporary storage bin 41. The switch valve 42 is opened when the bottom plate 3 descends from the highest position.

[0041] Therefore, when the scraper 21 cleans the bottom plate 3, the waste liquid still continuously flows into the treatment tank 1. In order to avoid the accidental discharge of the waste liquid from the discharge port 11, the switch valve 42 is not opened when the bottom plate 3 is at the highest position. Of course, there are exceptions, which will be described below. When the bottom plate 3 stays at the highest position for the second rated time, the bottom plate 3 starts to descend, and the switch valve 42 is opened.

[0042] Referring to Figure 5: The float 43 is arranged in the temporary storage bin 41 to move in the vertical direction, and the trigger button 44 is arranged directly above the float 43. When the waste liquid is injected into the temporary storage bin 41, the float 43 rises in the vertical direction, and after the float 43 rises, the trigger button 44 can be triggered, the switch valve 42 is activated and opened by one quarter, and the activation command of the trigger button 44 to the switch valve 42 is in the highest priority.

[0043] In the process of arsine production, the generated waste liquid cannot be kept at a constant value, so that the volume of the temporary storage bin 41 will be insufficient. In order to avoid the temporary storage bin 41 being full, the float 43 and the trigger button 44 are arranged in the temporary storage bin 41. When the trigger button 44 is pressed by the float 43, because the float 43 floats on the surface of the waste liquid in the temporary storage bin 41, the temporary storage bin 41 is not completely full 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 triggers the switch valve 42 to open, which leaves operation time. It is worth noting that the switch valve 42 activated by the trigger button 44 can only be opened by one quarter, and will be opened regardless of whether the bottom plate 3 is in the highest position. The opened switch valve 42 can slow down the pressure of the pre-stored waste liquid in the temporary storage bin 41, and the switch valve 42 opened by one quarter can avoid more waste liquid falling on the bottom plate 3 when the bottom plate 3 is in the highest position, so that the precipitate on the bottom plate 3 is not cleaned in time, and the waste liquid is discharged through the discharge port 11.

[0044] Referring to Figure 2 , Figure 5 and Figure 6 : The stirring unit 2 includes a plurality of telescopic rods 22 arranged in the processing tank 1 along the axis of the processing tank 1, and the adjacent telescopic rods 22 are sleeved and slidably connected in the vertical direction, and the adjacent telescopic rods 22 are key connected. Each telescopic rod 22 is provided with a stirring rod 23, and the plurality of telescopic rods 22 in the processing tank 1 form a driving part. The upper part of the driving part is provided with a first driving unit 24 for driving the telescopic rod 22 to rotate. When the bottom plate 3 rises, the telescopic rod 22 is pushed to shrink, and after the bottom plate 3 reaches the highest position, all the telescopic rods 22 are shrunk to the shortest state.

[0045] The first driving unit 24 comprises a first tooth ring 241, a first gear 242 and a first rotary driver 243. The first tooth ring 241 is fixedly sleeved on the upper portion of the driving portion, and the first gear 242 is rotatably arranged on one side of the first tooth ring 241. The first tooth ring 241 and the first gear 242 are in mesh with each other. The first rotary driver 243 is arranged at the end of the first gear 242, and is used to drive the first gear 242 to rotate. The first rotary driver 243 is preferably a servo motor. The scraper 21 is fixedly arranged at the bottom of the telescopic rod 22 located at the lowermost layer. When stirring is needed, the first rotary driver 243 is started, and drives the first tooth ring 241 to rotate through the first gear 242, so that the driving portion rotates, that is, all the telescopic rods 22 rotate. When the processing tank 1 is self-cleaning, the driving portion is continuously in a rotating state, and at this time the telescopic rods 22 are completely retracted, and the scraper 21 is in contact with the upper portion of the bottom plate 3, so that the scraper 21 continuously cleans the upper end face of the bottom plate 3.

[0046] With reference to Figure 2 and Figure 3 The driving portion formed by the telescopic rods 22 is provided with a ventilation groove 25 in the vertical direction. The ventilation groove 25 is provided with an air pump 26 at the upper portion. The air pump 26 fills the ventilation groove 25 with air when the bottom plate 3 is lowered, and is disconnected from the ventilation groove 25 when the bottom plate 3 is lowered to the lowest position.

[0047] The ventilation groove 25 is filled with air by the air pump 26 when the bottom plate 3 is lowered, so that the bottom of the telescopic rod 22 is completely pressed on the bottom plate 3, ensuring that the telescopic rod 22 is continuously in a stretched state. When the bottom of the telescopic rod 22 located at the lowermost layer is separated from the bottom plate 3 under the action of the air pump 26, the telescopic rods 22 arranged in the processing tank 1 are elongated to the longest state. Then the air pump 26 is disconnected from the ventilation groove 25, so that the ventilation groove 25 realizes air locking. In this way, it can be ensured that the adjacent telescopic rods 22 do not slide relative to each other during stirring. During the process that the bottom plate 3 rises from the lowest position, the air pump 26 connects the ventilation groove 25 with the outside, and the bottom plate 3 can smoothly drive the telescopic rods 22 to contract.

[0048] With reference to Figure 3 , Figure 4 and Figure 7 A collecting unit 5 is arranged on the periphery of the processing tank 1, and is used to collect the precipitate discharged from the discharge port 11. The collecting unit 5 comprises an outer shell 52 sleeved on the periphery of the processing tank 1. There is an annular gap between the outer shell 52 and the processing tank 1. A collecting box 51 is slidably arranged on the annular gap in the vertical direction. A second driving unit 53 for driving the collecting box 51 to move in the vertical direction is arranged at the lower portion of the collecting box 51. The collecting box 51 and the outer shell 52 jointly form a collecting groove.

[0049] The collecting groove collects the precipitate, the second driving unit 53 comprises a second rotary driver 531, a second gear 532, a second tooth ring 533, a third tooth ring 534, a fixing frame 535 and a lead screw 536, the fixing frame 535 is arranged at the lower part of the collecting box 51, the discharge port 54 is formed in the side wall of the shell 52, the fixing frame 535 is located below the discharge port 54, the fixing frame 535 is fixedly connected with the shell 52, the lead screw 536 penetrates through the fixing frame 535 in the vertical direction and is in key connection with the fixing frame 535, and the lead screw 536 is in sliding fit with the fixing frame 535 in the vertical direction, a plurality of lead screws 536 are arranged on the fixing frame 535 and are uniformly distributed around the axis of the treatment tank 1, the second tooth ring 533 is sleeved on the lead screw 536 and is in screw fit with the lead screw 536, the third tooth ring 534 is sleeved on the outer periphery of the second tooth ring 533, the inner ring and the outer ring of the third tooth ring 534 are provided with meshing teeth, the second gear 532 is arranged on the outer periphery of the third tooth ring 534, the second rotary driver 531 is arranged at the end of the second gear 532, and the second rotary driver 531 is used for driving the second gear 532 to rotate, the upper part of the lead screw 536 is connected with the bottom of the collecting box 51, the second tooth ring 533 is rotationally arranged at the lower part of the fixing frame 535 and cannot move in the vertical direction, since the second tooth ring 533 is in screw fit with the lead screw 536 and the fixing frame 535 restricts the lead screw 536, that is, when the second tooth ring 533 rotates, the lead screw 536 can only move in the vertical direction, so that the lifting of the collecting box 51 is realized.

[0050] With reference to Figure 8 The discharge port 54 is formed in the side wall of the shell 52 and is lower than the discharge port 11, the collecting box 51 has a first stop position and a second stop position when moving in the vertical direction, 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 at the horizontal side of the discharge port 11 and forms the collecting groove with the shell 52, and when the collecting box 51 is located at the second stop position, the collecting box 51 is located at the horizontal side of the discharge port 54 and the collecting groove disappears.

[0051] That is, the collecting groove is formed by the collecting box 51 and the inner wall of the shell 52, when the collecting box 51 descends to the second stop position, the collecting groove disappears, and when the collecting box 51 descends to the second stop position, the precipitate on the collecting box 51 can be removed by the worker or a mechanical hand, and the stopping time of the collecting groove at the first stop position can be preset according to the actual situation.

[0052] With reference to Figure 3 and Figure 4 The fan 55 is arranged at the upper part of the shell 52, one side of the fan 55 is communicated with an air filter, and the fan 55 is used for extracting the waste gas in the treatment tank 1.

[0053] The reversing valve 56 is provided on the side wall of the treatment tank 1, and is a two-position two-way valve, which is communicated with the outside air and the chemical agent to be put into the treatment tank 1 respectively. When the waste liquid is put into the treatment tank 1, the reversing valve 56 is switched to the position communicated with the chemical agent, and the chemical agent is put into the treatment tank 1. After the chemical agent is put in, the reversing valve 56 is switched, and the fan 55 is started to draw the gas in the treatment tank 1, and the reversing valve 56 supplies the outside air into the treatment tank 1. Thus, the waste gas generated in the treatment tank 1 due to the chemical reaction can be discharged into the air filter in time, and the situation that the waste gas leaks from the discharge port 54 when the collecting box 51 is lowered to the position of the discharge port 54, i.e. when the collecting box 51 is located at the second stop position, is avoided.

[0054] Working principle: a certain amount of waste liquid and a corresponding proportion of chemical agent are put into the treatment tank 1, and at this time, the bottom plate 3 is at the lowest position. Then, the stirring unit 2 in the treatment tank 1 starts to stir, and the scraper 21 provided 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 the precipitate on the bottom plate 3 when it rotates 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 the actual situation, i.e. the precipitate on the bottom plate 3 at the lowest position will not be lifted when the scraper 21 rotates, so as to ensure that the precipitate can be stably precipitated to the bottom of the treatment tank 1 and be received by the bottom plate 3.

[0055] The bottom plate 3 is preset with a first rated time when in the lowest position, and when the time of the bottom plate 3 staying in the lowest position reaches the first rated time, the bottom plate 3 starts to rise, and the bottom plate 3 can also scrape off the solid adhered to the inner wall of the treatment tank 1 in the process of rising, and in the rising process of the bottom plate 3, the bottom plate 3 will lift the scraper 21 at the bottom of the stirring unit 2 together, the lower part of the scraper 21 is completely fitted with the upper end surface of the bottom plate 3, and 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, and at the same time, the stirring unit 2 continuously stays in the rotating state, the stirring unit 2 drives the scraper 21 to rotate, and the scraper 21 in rotation sweeps the upper end surface of the bottom plate 3 in the highest position, so that the precipitate 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 in the highest position, and when the time of the bottom plate 3 staying in the highest position reaches the second rated time, the bottom plate 3 starts to descend, so that the function of the treatment tank 1 being able to self-clean the precipitate at the bottom of the treatment tank 1 is realized, and at the same time, due to the short cleaning time, the feeding unit 4 has the waste liquid storage function, the feeding unit 4 can store in advance when the treatment tank 1 is self-cleaning, and after cleaning, the bottom plate 3 descends, and the feeding unit 4 feeds the waste liquid, so that the waste water treatment device does not need to be paused when self-cleaning, and both self-cleaning and waste water treatment efficiency are ensured.

[0056] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A multi-stage wastewater treatment device for arsine production, comprising a treatment tank (1) and a stirring unit (2) arranged in the treatment tank (1); characterized in that A discharge port (11) is formed in the side wall of the treatment tank (1), the treatment tank (1) has a cylindrical structure, a bottom plate (3) is arranged in the treatment tank (1) and slides along the axis of the treatment tank (1), a plurality of filter holes are vertically and uniformly formed in 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 arranged at the bottom of the stirring unit (2) and extends in 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) is in contact with the scraper (21) and can drive the scraper (21) to rise synchronously until the bottom plate (3) stops moving when reaching the highest position; The bottom plate (3) has a rotary body structure, the horizontal cross-sectional area of the upper part of the bottom plate (3) is smaller than that of the lower part of the bottom plate (3), the upper end surface of the bottom plate (3) has an inclined structure, and the inclined structure inclines downward from the axis of the bottom plate (3) to the outer periphery of the bottom plate (3), the lower part of the scraper (21) is fitted with the upper end surface of the bottom plate (3); The scraper (21) completely sweeps the upper end surface of the bottom plate (3) during rotation, so that the scraper (21) forms a sweeping area during rotation, and the sweeping area completely covers the upper part of the bottom plate (3); The stirring unit (2) comprises a plurality of telescopic rods (22), the telescopic rods (22) are arranged in the treatment tank (1) along the axis of the treatment tank (1), and adjacent telescopic rods (22) are sleeved with each other and are in sliding fit in the vertical direction; A ventilation groove (25) is formed in the driving part of the telescopic rod (22) and extends in the vertical direction, a gas pump (26) is arranged at the upper part of the ventilation groove (25), the gas pump (26) inflates the ventilation groove (25) when the bottom plate (3) descends, and the gas pump (26) is disconnected from the ventilation groove (25) when the bottom plate (3) descends to the lowest position; During the rising of the bottom plate (3) from the lowest position, the gas pump (26) connects the ventilation groove (25) with the outside, and the bottom plate (3) can smoothly push the telescopic rod (22) to contract; A feeding unit (4) is arranged at the upper part of the treatment tank (1), the feeding unit (4) comprises a temporary storage bin (41), the temporary storage bin (41) is used for pre-storing waste liquid discharged into the treatment tank (1), and a switch valve (42) is arranged at the bottom of the temporary storage bin (41), the switch valve (42) is opened when the bottom plate (3) descends from the highest position. A float (43) is arranged in the temporary storage bin (41) to move vertically, and a trigger button (44) is arranged above the float (43). When the temporary storage bin (41) is filled with waste liquid, the float (43) rises vertically, and the trigger button (44) is triggered after the float (43) rises, the switch valve (42) is activated and opened by one quarter, and the activation command of the trigger button (44) to the switch valve (42) has the highest priority.

2. The multi-stage wastewater treatment device for arsine production according to claim 1, characterized by, The bottom plate (3) reciprocates along the axis direction of the treatment tank (1), the time when the bottom plate (3) stays at the lowest position is preset as a first rated time, and the time when the bottom plate (3) stays at the highest position is preset as 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.

3. The multi-stage wastewater treatment device for arsine production according to claim 1, characterized in that, The adjacent telescopic rods (22) are connected, each telescopic rod (22) is provided with a stirring rod (23), and a plurality of telescopic rods (22) in the treatment tank (1) form a driving part. The upper part of the driving part is provided with a first driving unit (24) for driving the telescopic rod (22) to rotate. When the bottom plate (3) rises, it can push the telescopic rod (22) to shrink, and after the bottom plate (3) reaches the highest position, all telescopic rods (22) are shrunk to the shortest state.

4. The multi-stage wastewater treatment device for arsine production according to claim 1, characterized by, A collection unit (5) is arranged on the periphery of the treatment tank (1), which is used to collect the precipitate discharged from the discharge port (11). The collection unit (5) includes a shell (52) sleeved on the periphery of the treatment tank (1), and an annular gap is formed between the shell (52) and the treatment tank (1). The collection box (51) is arranged to slide vertically in the annular gap. A second driving unit (53) is arranged at the lower part of the collection box (51) to drive the collection box (51) to move vertically. The collection box (51) and the shell (52) jointly form a collection groove.

5. The multi-stage wastewater treatment device for arsine production according to claim 4, characterized in that, A discharge port (54) is formed in the side wall of the shell (52), which is lower than the discharge port (11). The collection box (51) has a first stop position and a second stop position when moving vertically. The first stop position and the second stop position are distributed from top to bottom along the vertical direction. When the collection box (51) is located at the first stop position, the collection box (51) is located at the horizontal side of the discharge port (11) and forms a collection groove with the shell (52). When the collection box (51) is located at the second stop position, the collection box (51) is located at the horizontal side of the discharge port (54), and the collection groove disappears.

6. The multi-stage wastewater treatment apparatus for arsine production according to claim 4, characterized by A fan (55) is arranged at the upper part of the shell (52), and one side of the fan (55) is communicated with an air filter. The fan (55) is used to extract waste gas in the treatment tank (1).

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