Pretreatment device and pretreatment method for silver powder wastewater

Abstract

The present application discloses a pretreatment device and a pretreatment method for silver powder wastewater, and relates to the field of treatment of silver powder wastewater. A pretreatment device for silver powder wastewater of the present application comprises a treatment tank, an electrode assembly and a cleaning assembly, wherein the electrode assembly comprises a mounting shell, an electrode cavity provided in the mounting shell, and a plurality of electrode sheets accommodated in the electrode cavity, wherein the electrode cavity is connected to the treatment tank, and the cleaning assembly comprises a cleaning cavity for passing and storing liquid, a cleaning pump provided in the cleaning cavity, and a cleaning tube connected to the cleaning pump at one end, wherein the other end of the cleaning tube is connected to the electrode cavity. In the pretreatment device of the present application, the liquid stored in the cleaning cavity can be flushed into the electrode cavity with the cooperation of the cleaning pump and the cleaning tube, and the flushing liquid can flush out the hydroxide in the electrode cavity and the hydroxide adhered to the electrode sheet, thereby preventing the hydroxide from remaining on the electrode sheet and improving the use efficiency of the electrode assembly.

Description

Technical Field

[0001] The present application relates to the field of silver powder wastewater treatment, and in particular to a silver powder wastewater pretreatment device and pretreatment method. Background Art

[0002] In the industrial production process of silver powder, a large amount of high-concentration silver powder wastewater will be generated. The composition of these silver powder wastewaters is complex and needs to be subjected to multiple chemical treatments before discharge to ensure that the treated wastewater meets the recycling standards. Before treating the silver powder wastewater, it is usually necessary to pre-treat the silver powder wastewater. The pre-treatment can remove solid impurities in the silver powder wastewater and recover the trace silver powder in the silver powder wastewater.

[0003] In the prior art, an electrocoagulation flotation device is usually used to pre-treat silver powder wastewater. The electrocoagulation flotation device is equipped with a group of wide special electrode sheets, which electrolyze the silver powder wastewater and produce hydroxides, and then flocculate the silver powder wastewater through the hydroxide to remove solid impurities and recover trace silver powder.

[0004] However, the hydroxide produced by the electrode sheet needs to float upward and away from the electrode sheet before it can flocculate the silver powder wastewater. Not only is the flocculation efficiency low, but some hydroxides are easily adhered to the electrode sheet during the upward floating process, resulting in a reduction in the contact area between the electrode sheet and the silver powder wastewater. This greatly affects the electrolysis performance of the electrode sheet for silver powder wastewater and reduces the utilization efficiency of the electrode sheet. Summary of the invention

[0005] One object of the present application is to overcome the deficiencies of the prior art and to provide a pretreatment device for silver powder wastewater that can prevent hydroxide from adhering to electrode sheets.

[0006] A pretreatment device provided in this application adopts the following technical solution:

[0007] A pretreatment device for silver powder wastewater, comprising a treatment tank, an electrode assembly arranged in the treatment tank, the electrode assembly comprising a mounting shell, an electrode cavity opened in the mounting shell, and a plurality of electrode sheets accommodated in the electrode cavity, the electrode cavity being connected to the treatment tank, the pretreatment device further comprising a cleaning assembly arranged in the treatment tank and below the mounting shell, the cleaning assembly comprising a cleaning cavity for passing and storing liquid, a cleaning pump arranged in the cleaning cavity, a cleaning pipe having one end connected to the cleaning pump, and the other end of the cleaning pipe being connected to the electrode cavity;

[0008] The electrode assembly further comprises a liquid inlet cavity opened at the bottom of the mounting shell, and a plurality of guide plates arranged at intervals in the liquid inlet cavity and distributed in a fan shape, one end of the liquid inlet cavity is connected to the cleaning pipe, and the other end is connected to the electrode cavity, and the arrangement direction of the plurality of guide plates is perpendicular to the direction from one end to the other end of the liquid inlet cavity;

[0009] The electrode assembly also includes a liquid outlet groove opened on the bottom wall of the electrode cavity and connected to the liquid inlet cavity, the liquid outlet groove extends along the arrangement direction of the multiple guide plates, the multiple electrode sheets are upright, and the lower end of each electrode sheet is respectively provided with a conical first guide block, and the multiple first guide blocks are inserted into the liquid outlet groove at intervals along the extension direction of the liquid outlet groove, and a second guide block is also provided between each two adjacent electrode sheets, and the lower ends of the second guide blocks are respectively provided with arc-shaped guide surfaces on both sides.

[0010] By adopting the above technical scheme, the liquid stored in the cleaning chamber can be flushed into the electrode chamber under the cooperation of the cleaning pump and the cleaning tube, and the flushing liquid can flush out the hydroxide in the electrode chamber and the hydroxide adhered to the electrode sheet, which can not only increase the movement speed of the hydroxide and improve the flocculation efficiency, but also avoid the hydroxide remaining on the electrode sheet, thereby improving the use efficiency of the electrode assembly; at the same time, the liquid entering the electrode chamber can be uniformly flushed toward the surrounding side of the electrode chamber under the guidance of multiple fan-shaped guide plates, effectively eliminating the flushing dead corners in the electrode chamber and on the electrode sheet, thereby further avoiding hydroxide residue; and the liquid output from the liquid outlet trough can be flushed upward along the surface of the electrode sheet under the guidance of the first guide block, and then flushed toward the two sides of the electrode sheet under the guidance of the two guide surfaces, which can not only avoid the liquid from directly vertically impacting the bottom of the electrode sheet and the top of the electrode chamber to generate eddy current retention area, but also improve the flushing uniformity of the liquid on the electrode sheet and in the electrode chamber, thereby further avoiding hydroxide residue.

[0011] Preferably, the mounting shell comprises a plurality of shells stacked up and down, each of the shells is provided with the electrode cavity, at least one side of the shell is provided with a through hole for connecting the electrode cavity and the treatment pool, a guide plate is provided on the shell on the side of the through hole, and the guide plate is inclined outward in a bottom-up direction.

[0012] By adopting the above technical solution, multiple electrode sheets can be reduced in size and packaged in multiple shells, effectively reducing the probability of hydroxide adhesion on the electrode sheets; at the same time, the guide plate can guide the liquid and hydroxide to prevent the liquid and hydroxide output from the lower electrode cavity from flowing into the upper electrode cavity again.

[0013] Preferably, the treatment pool includes a first pool body and a second pool body arranged side by side, the upper end of the first pool body and the upper end of the second pool body are connected to each other, the electrode assembly is accommodated in the first pool body, and a stirring assembly is arranged in the second pool body. The pretreatment device also includes an infusion assembly, and the infusion assembly includes a plurality of infusion tubes, each end of the infusion tube has a first tube end and a second tube end, respectively, the first tube end is located in the second pool body and is covered with a filter, and the second tube end is connected to the cleaning chamber.

[0014] By adopting the above technical solution, the silver powder wastewater in the second pool body can form a pretreated liquid after stirring and flocculation. The pretreated liquid can flow into the cleaning chamber through the infusion tube after being filtered through the filter to achieve wastewater reuse, effectively reducing the cleaning component's dependence on external liquid and saving costs.

[0015] Preferably, the treatment pool also includes a third pool body connected to the second pool body, the liquid infusion tube includes a first tube body and a second tube body, the first tube end is located on the first tube body, the second tube end is located on the second tube body, the first tube body is provided with a liquid outlet at one end away from the first tube end, the liquid outlet has a partition, the partition divides the liquid outlet into an outlet a and an outlet b, the outlet a is connected to the second tube body, and the outlet b is connected to the third pool body.

[0016] By adopting the above technical solution, only a part of the pretreatment liquid entering the infusion tube enters the cleaning chamber through outlet a, and the remaining pretreatment liquid can be normally output to the third pool body through outlet b, preventing excessive pretreatment liquid from entering the cleaning chamber and affecting the treatment efficiency of the pretreatment device.

[0017] Preferably, the liquid outlet is arranged toward the third pool body, and an extrusion portion is provided on at least one side wall of the outlet b, and the extrusion portion is inclined inwardly along the opening direction of the liquid outlet.

[0018] By adopting the above technical solution, the extrusion part can reduce the cross-sectional area of ​​the outlet b through the inclined surface thereon, thereby increasing the flow rate of the pre-treated liquid when it is output from the outlet b and preventing the pre-treated liquid output from the outlet b from flowing back.

[0019] Preferably, the pretreatment device also includes a plurality of liquid outlet channels opened on the second pool body and connected to the third pool body, and a plurality of the first tube bodies are respectively and correspondingly arranged in the plurality of liquid outlet channels. The stirring assembly includes a plurality of stirring paddles rotatably arranged around their own axial direction and a power module for driving the stirring paddles to rotate. The plurality of stirring paddles correspond one-to-one to the plurality of first tube bodies, and one end of each of the stirring paddles has a connecting end rotatably connected to the first tube end, and the connecting end is located in the liquid outlet channel. A plurality of fan blades are arranged at intervals on the circumferential side of the connecting end, and the fan blades are curved, and the bending directions of the plurality of fan blades are the same.

[0020] By adopting the above technical solution, multiple curved fan blades can generate huge centrifugal force during rotation, so that impurities in the pretreatment liquid can be thrown to the surrounding side of the liquid outlet channel by the centrifugal force, effectively reducing the impurity content in the pretreatment liquid entering the cleaning chamber, thereby preventing the pretreatment liquid from attaching too many impurities to the electrode sheet during the process of flushing the electrode sheet.

[0021] Preferably, the pretreatment device also includes a scum assembly arranged in the third pool body, the scum assembly includes a first partition and a second partition arranged in a direction away from the second pool body, the first partition and the second partition are both upright, a scum cavity is formed between the first partition and the second partition, the upper end surface of the first partition is inclined downward in a direction close to the second partition, a scum plate is provided at the upper end of the second partition, the scum plate is suspended above the scum cavity and inclined upward in a direction from the first partition to the second partition.

[0022] By adopting the above technical solution, the pretreatment liquid continuously discharged into the third tank body can gradually flow into the scum cavity along the upper end surface of the first partition plate, and the impurities in the pretreatment liquid in the scum cavity can float to the liquid surface and gradually adhere to the scum plate, making it easier for staff to clean the impurities.

[0023] Another object of the present application is to provide a method for pretreating silver powder wastewater.

[0024] A pretreatment method provided in this application adopts the following technical solution:

[0025] A pretreatment method for silver powder wastewater, the pretreatment method is based on the above-mentioned pretreatment device, and comprises the following steps:

[0026] Step 1, introducing silver powder wastewater into the treatment pool, the silver powder wastewater is divided into two streams, one of which enters the first pool body, and multiple electrode sheets in the electrode cavity electrolyze the silver powder wastewater entering the first pool body to generate hydroxide;

[0027] Step 2, part of the generated hydroxide floats upward to the liquid surface of the silver powder wastewater, and the part of the hydroxide merges with another stream of the silver powder wastewater and enters the second tank body, and the stirring component stirs and flocculates the silver powder wastewater and the hydroxide entering the second tank body to obtain a pretreated liquid;

[0028] Step 3, the pre-treated liquid is filtered through the filter screen and then passed into the first tube body, the pre-treated liquid reaches the liquid outlet and is divided into two streams under the action of the partition, one of which enters the second tube body through the outlet a, and the other pre-treated liquid is discharged into the third tank body through the outlet b;

[0029] Step 4, the pretreatment liquid entering the second tube body flows into the cleaning chamber, and then the cleaning pump pumps the pretreatment liquid in the cleaning chamber upward into the electrode chamber. The pretreatment liquid flushes the electrode chamber and multiple electrode sheets during the flow, and flushes the remaining hydroxide in the electrode chamber and the hydroxide adhering to the multiple electrode sheets into the second cell body;

[0030] Step 5, repeat steps 2-4 until all the silver powder wastewater is treated.

[0031] By adopting the above technical scheme, the pre-treated liquid in the second tank body after stirring and flocculation can flow into the cleaning cavity through the infusion tube, and then be flushed into the electrode cavity with the cooperation of the cleaning pump and the cleaning tube. The flushed pre-treated liquid can flush out the hydroxide in the electrode cavity and the hydroxide adhered to the electrode sheet, which can not only increase the movement speed of the hydroxide and improve the flocculation efficiency, but also avoid the hydroxide remaining on the electrode sheet, thereby improving the use efficiency of the electrode assembly, while also realizing the reuse of wastewater and saving costs.

[0032] In summary, the present invention includes at least one of the following beneficial technical effects:

[0033] The liquid stored in the cleaning chamber can be flushed into the electrode chamber with the cooperation of the cleaning pump and the cleaning tube. The flushing liquid can flush out the hydroxide in the electrode chamber and the hydroxide adhered to the electrode sheet, which can not only increase the movement speed of the hydroxide and improve the flocculation efficiency, but also avoid the hydroxide from remaining on the electrode sheet, thereby improving the use efficiency of the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the structure of the pretreatment device in Example 1 of the present application;

[0035] Figure 2 yes Figure 1 Overall cross-sectional view;

[0036] Figure 3 yes Figure 2A partial cross-sectional view of the first tank body and the second tank body;

[0037] Figure 4 yes Figure 2 Another partial cross-sectional view of the first cell body and the second cell body;

[0038] Figure 5 is a partial cross-sectional view of the electrode assembly in Example 1 of the present application;

[0039] Figure 6 yes Figure 5 Exploded diagram of

[0040] Figure 7 yes Figure 2 A partial cross-sectional view of the second tank body;

[0041] Figure 8 yes Figure 2 Another partial cross-sectional view of the second tank body.

[0042] Markings in the accompanying drawings:

[0043] 1. Treatment tank; 11. First tank body; 12. Second tank body; 13. Third tank body; 14. Liquid outlet channel; 15. Diverter; 16. Liquid outlet; 2. Electrode assembly; 21. Mounting shell; 211. Shell; 212. Through hole; 22. Electrode cavity; 23. Electrode sheet; 24. Liquid inlet cavity; 25. Guide plate; 26. Liquid outlet trough; 27. First guide block; 28. Second guide block; 29. ​​Guide plate; 3. Cleaning assembly; 31. Cleaning cavity; 32. Cleaning pump; 33. Cleaning pipe; 331. Main pipe; 332. Branch pipe; 4. Stirring group Parts; 41, stirring paddle; 411, rotating shaft; 412, stirring part; 4121, paddle; 42, power module; 421, motor; 43, fan blade; 5, infusion component; 51, infusion tube; 511, first tube body; 512, second tube body; 513, liquid outlet; 5131, outlet a; 5132, outlet b; 52, filter; 53, partition; 54, extrusion part; 6, scum component; 61, first partition; 62, second partition; 63, scum chamber; 64, scum plate; 7, water pump; 8, adsorption component; 9, scraping component. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-8 The present invention is described in further detail.

[0045] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] Example 1: See Figure 1-Figure 8 As shown, a pretreatment device for silver powder wastewater is shown, including a treatment pool 1, a water pump 7 for inputting silver powder wastewater into the treatment pool 1 is arranged on the upper part of the treatment pool 1, an electrode assembly 2 and a cleaning assembly 3 are arranged in the treatment pool 1, and a drain port 16 for discharging the pretreatment liquid is opened on the side of the treatment pool 1. Among them, there are multiple electrode assemblies 2 and they are arranged in the horizontal direction. Each electrode assembly 2 includes a mounting shell 21, an electrode cavity 22 opened in the mounting shell 21, and multiple electrode sheets 23 accommodated in the electrode cavity 22. The electrode cavity 22 is connected with the treatment pool 1. The cleaning assembly 3 is located below the mounting shell 21, which includes a cleaning cavity 31 for passing and storing liquid, a cleaning pump 32 arranged in the cleaning cavity 31, and a cleaning pipe 33 whose one end is connected to the cleaning pump 32, and the other end of the cleaning pipe 33 is connected to the electrode cavity 22.

[0047] When pre-treating the silver powder wastewater, the silver powder wastewater is first input into the treatment tank 1 through the pump 7, and then the multiple electrodes in the electrode cavity 22 electrolyze the silver powder wastewater to generate hydroxides, and the hydroxides flocculate the silver powder wastewater in the treatment tank 1 and separate large particles of impurities, and then the treated pre-treated liquid is output from the drain port 16; at the same time, the liquid introduced into and stored in the cleaning cavity 31 can be flushed into the electrode cavity 22 with the cooperation of the cleaning pump 32 and the cleaning tube 33, and the flushing liquid can flush out the hydroxide in the electrode cavity 22 and the hydroxide adhered to the electrode sheet 23, which can not only increase the movement speed of the hydroxide and improve the flocculation efficiency, but also avoid the hydroxide from remaining on the electrode sheet 23, thereby improving the use efficiency of the electrode assembly 2.

[0048] In this embodiment, combined with Figure 3-Figure 4 As shown, the mounting shell 21 is a square tube arranged upright, which is convenient for installing the mass-produced electrode sheet 23 in the electrode cavity 22; the material of the electrode sheet 23 is mainly iron or aluminum, and the hydroxides produced during the electrolysis of water are mainly iron hydroxide and aluminum hydroxide; the cleaning cavity 31 can be connected to an external water source to input external clean liquid into the cleaning cavity 31 through the external water source.

[0049] In this embodiment, combined with Figure 5-Figure 6As shown, the electrode assembly 2 also includes a liquid inlet cavity 24 opened at the bottom of the mounting shell 21, a plurality of guide plates 25 arranged at intervals in the liquid inlet cavity 24 and distributed in a fan shape, the liquid inlet cavity 24 is arranged horizontally, the guide plates 25 are arranged upright in the liquid inlet cavity 24, one end of the liquid inlet cavity 24 is connected with the cleaning tube 33, and the other end is connected with the electrode cavity 22, and the arrangement direction of the plurality of guide plates 25 is perpendicular to the direction from one end to the other end of the liquid inlet cavity 24. After the liquid in the cleaning cavity 31 enters the electrode cavity 22 through the cleaning tube 33, it can be uniformly flushed toward the peripheral side of the electrode cavity 22 under the guidance of the plurality of fan-shaped guide plates 25, effectively eliminating the flushing dead angles in the electrode cavity 22 and on the electrode sheet 23, thereby further avoiding hydroxide residue.

[0050] In this embodiment, the electrode assembly 2 further includes a liquid outlet groove 26 which is provided on the bottom wall of the electrode cavity 22 and communicates with the liquid inlet cavity 24. The upper end of the liquid outlet groove 26 is open and extends along the arrangement direction of the plurality of guide plates 25, and is used to output the liquid in the liquid inlet cavity 24 toward the electrode cavity 22. Among them, the plurality of electrode sheets 23 are all arranged upright, and the lower end of each electrode sheet 23 is respectively provided with a conical first guide block 27, and the plurality of first guide blocks 27 are inserted into the liquid outlet groove 26 at intervals along the extension direction of the liquid outlet groove 26, and a second guide block 28 is further provided between each two adjacent electrode sheets 23, and the lower ends of the second guide blocks 28 have arc-shaped guide surfaces on both sides.

[0051] In this way, after the liquid rushes upward from the liquid outlet trough 26, it can be flushed toward the two side surfaces of the electrode sheet 23 under the guidance of the two side slopes of the first guide block 27, and then when it approaches the second guide block 28, it is guided by the two guide surfaces to flush toward the two sides of the electrode sheet 23, which can avoid the liquid from directly vertically impacting the bottom of the electrode sheet 23 and the top of the electrode cavity 22, thereby preventing the formation of eddy current retention areas in the liquid outlet trough 26 and the electrode cavity 22; at the same time, through the guidance of the first guide block 27 and the second guide block 28, the flushing uniformity of the liquid on the electrode sheet 23 and in the electrode cavity 22 can also be improved, thereby further avoiding hydroxide residue.

[0052] In this embodiment, again combined Figure 3-Figure 4As shown, the mounting shell 21 includes a plurality of shells 211 stacked up and down, each shell 211 has an electrode cavity 22, and the left and right sides of the shell 211 are respectively provided with through-holes 212 for penetrating the electrode cavity 22 and the treatment tank 1, and the shell 211 on the side of each through-hole 212 is respectively provided with a guide plate 29, and the guide plate 29 is tilted outward from bottom to top. Among them, the cleaning pipe 33 includes a main pipe 331 connected to the cleaning pump 32, and a plurality of branch pipes 332 connected to the main pipe 331 and arranged in the vertical direction, and the plurality of branch pipes 332 are respectively connected to the plurality of electrode cavities 22. Reducing the volume of multiple electrode sheets 23 and packaging them in multiple shells 211 can effectively reduce the probability of hydroxide adhesion on the electrode sheets 23; at the same time, the guide plate 29 can guide the liquid and hydroxide to prevent the liquid and hydroxide output from the lower electrode cavity 22 from flowing into the upper electrode cavity 22 again, so as to ensure that the electrode sheets 23 in each electrode cavity 22 can have a higher electrolysis efficiency.

[0053] Combination Figure 2 As shown, the treatment tank 1 includes a first tank body 11, a second tank body 12 and a third tank body 13 arranged side by side in the horizontal direction, the electrode assembly 2 is accommodated in the first tank body 11, the upper end of the first tank body 11 and the upper end of the second tank body 12 are connected to each other, the second tank body 12 is provided with a stirring assembly 4, the second tank body 12 is connected to the third tank body 13, and the drain port 16 is opened on the third tank body 13. After the silver powder wastewater is input into the treatment tank 1, the silver powder wastewater can enter the first tank body 11 and the second tank body 12 respectively, the electrode assembly 2 electrolyzes the silver powder wastewater entering the first tank body 11 and generates hydroxide, and then the hydroxide flows into the second tank body 12, the stirring assembly 4 stirs and mixes the silver powder wastewater and the hydroxide entering the second tank body 12, the hydroxide flocculates the silver powder wastewater during the mixing process and obtains the pre-treated liquid, the pre-treated liquid flows into the third tank body 13 and is discharged through the drain port 16.

[0054] In this embodiment, combined with Figure 7-Figure 8As shown, the pretreatment device also includes an infusion component 5, which includes a plurality of infusion tubes 51, and the two ends of the infusion tubes 51 have a first tube end and a second tube end, respectively. The first tube end is located in the second pool body 12 and is covered with a filter screen 52, which is conical, and the second tube end is connected to the cleaning chamber 31. Among them, the first tube end is arranged along the vertical direction, and the filter screen 52 is covered on the top tube mouth of the first tube end. In this way, the silver powder wastewater and hydroxide in the second pool body 12 can flocculate and form a pretreatment liquid after being stirred by the stirring component 4. The pretreatment liquid flows into the cleaning chamber 31 through the infusion tube 51 after being filtered by the filter screen 52 to realize wastewater reuse. In this way, the silver powder wastewater itself can support the cleaning operation of the cleaning component 3 on the electrode sheet 23, and there is no need to input external liquid into the cleaning chamber 31, which effectively reduces the dependence of the cleaning component 3 on the external liquid and also saves costs.

[0055] In this embodiment, the infusion tube 51 includes a first tube body 511 and a second tube body 512. The first tube body 511 is L-shaped. The first tube end is located on the first tube body 511, which is a vertical section of the first tube body 511. The second tube body 512 is buried at the bottom of the second tank body 12 along the horizontal direction, and the second tube end is located at the end of the second tube body 512. The end of the first tube body 511 away from the first tube end is a horizontal section, and the end of the horizontal section is provided with a liquid outlet 513. The liquid outlet 513 has a partition 53 in it. The partition 53 is in an inverted L shape, which divides the liquid outlet 513 into an outlet b5132 and an outlet a5131 arranged up and down. The outlet a5131 is connected to the second tube body 512, and the outlet b5132 is connected to the third tank body 13. Under the cover of the partition 53, only a portion of the pretreatment liquid entering the infusion tube 51 enters the cleaning chamber 31 through the outlet a5131, and the remaining pretreatment liquid can be normally output to the third cell body 13 through the outlet b5132, preventing excessive pretreatment liquid from entering the cleaning chamber 31 and affecting the treatment efficiency of the pretreatment device.

[0056] In this embodiment, the liquid outlet 513 is disposed toward the third cell body 13, and an extrusion portion 54 is disposed on at least one side wall of the outlet b5132, and the extrusion portion 54 is inclined inwardly along the opening direction of the liquid outlet 513. The extrusion portion 54 can reduce the cross-sectional area of ​​the outlet b5132 through the inclined surface thereon, thereby increasing the flow rate of the pre-treated liquid when it is output from the outlet b5132, and preventing the pre-treated liquid output from the outlet b5132 from flowing back.

[0057] In this embodiment, combined with Figure 3-Figure 4 and Figure 7-Figure 8As shown, the pretreatment device also includes a plurality of liquid outlet channels 14 opened at the bottom of the second tank body 12 and connected to the third tank body 13, and a plurality of first tubes 511 are respectively and correspondingly arranged in the plurality of liquid outlet channels 14. The stirring assembly 4 includes a plurality of stirring paddles 41 rotatably arranged around the axis direction thereof, and a power module 42 for driving the stirring paddles 41 to rotate. The stirring paddle 41 includes a rotating shaft 411 extending in a vertical direction, and a plurality of stirring parts 412 arranged at intervals along the extending direction of the rotating shaft 411. The power module 42 includes a plurality of motors 421, and the plurality of motors 421 are connected to the upper ends of the plurality of rotating shafts 411 in a one-to-one correspondence. Among them, the stirring part 412 includes a plurality of paddles 4121 arranged circumferentially around the rotating shaft 411, and the plurality of paddles 4121 are all arranged in a curved manner, and the curvature direction of at least one paddle 4121 is opposite to the curvature direction of the other paddles 4121.

[0058] After the silver powder wastewater and hydroxide enter the second tank body 12, the two can gradually flocculate under the stirring and mixing action of multiple stirring paddles 41, and most of the pretreated liquid obtained after flocculation can flow into the third tank body 13 through the liquid outlet channel 14, and the pretreated liquid with a higher flow rate output from the outlet b5132 can push the pretreated liquid entering the third tank body 13, so that impurities in the pretreated liquid float upward; at the same time, by setting the bending direction of at least one blade 4121 to be opposite to the bending direction of other blades 4121, the opposite blade 4121 can create a flow path in the opposite direction, thereby increasing the mixing efficiency of the silver powder wastewater and the hydroxide, and improving the flocculation effect of the silver powder wastewater.

[0059] In this embodiment, combined with Figure 7-Figure 8 As shown, a conical diversion portion 15 is also provided between each two adjacent liquid outlet channels 14 , and the diversion portion 15 is arranged toward the second cell body 12 , and is used to divert the pretreated liquid in the second cell body 12 to two adjacent liquid outlet channels 14 to avoid the pretreated liquid remaining between the two adjacent liquid outlet channels 14 .

[0060] In this embodiment, the plurality of rotating shafts 411 correspond to the plurality of first tube bodies 511 one by one, and the lower end of each rotating shaft 411 has a connecting end rotatably connected to the first tube end, the connecting end is coaxially connected to the first tube end, and the connecting end is located in the liquid outlet channel 14, and the peripheral side of the connecting end is provided with a plurality of blades 43 at intervals, and the blades 43 are curved, and the bending directions of the plurality of blades 43 are the same. The plurality of curved blades 43 can generate a huge centrifugal force during the rotation process, so that the impurities in the pre-treated liquid can be thrown to the peripheral side of the liquid outlet channel 14 by the centrifugal force, effectively reducing the impurity content in the pre-treated liquid passed into the cleaning chamber 31, thereby preventing the pre-treated liquid from attaching too many impurities to the electrode sheet 23 during the process of flushing the electrode sheet 23.

[0061] Further, combined with Figure 3-Figure 4 As shown, an adsorption component 8 is also provided in the cleaning chamber 31, and the adsorption component 8 is used to perform adsorption treatment on the pre-treated liquid entering the cleaning chamber 31, so as to further remove impurities in the pre-treated liquid and prevent the impurities from adhering to the electrode sheet 23. Among them, the adsorption component 8 is an electrolysis device in the prior art, and the specific structure and principle are not repeated here.

[0062] In this embodiment, combined with Figure 1-Figure 2 As shown, the pretreatment device also includes a scum assembly 6 arranged in the third pool body 13, and the scum assembly 6 includes a first partition 61 and a second partition 62 arranged in a direction away from the second pool body 12, the first partition 61 and the second partition 62 are both upright, and a scum cavity 63 is formed between the first partition 61 and the second partition 62, the upper end surface of the first partition 61 is inclined downward in a direction close to the second partition 62, and a scum plate 64 is provided at the upper end of the second partition 62, and the scum plate 64 is suspended above the scum cavity 63 and inclined upward in a direction from the first partition 61 to the second partition 62.

[0063] After the pretreatment liquid flows into the third tank body 13 from the liquid outlet channel 14, it can gradually accumulate in the chamber between the first partition 61 and the second tank body 12, and then flow into the scum chamber 63 along the upper end surface of the first partition 61. The impurities in the pretreatment liquid in the scum chamber 63 can float to the liquid surface and gradually adhere to the scum plate 64, making it convenient for the staff to clean the impurities.

[0064] In this embodiment, a scraper assembly 9 is further provided at the upper end of the third tank body 13, and the scraper assembly 9 can reciprocate to scrape the scum on the scum plate 64. The scraper assembly 9 is a prior art, and the specific structure and principle are not described in detail.

[0065] Embodiment 2: This embodiment discloses a pretreatment method for silver powder wastewater, which is based on the pretreatment device of embodiment 1 and includes the following steps:

[0066] Step 1, introducing silver powder wastewater into the treatment pool 1, the silver powder wastewater is divided into two streams, one of which enters the first pool body 11, and the plurality of electrode sheets 23 in the electrode cavity 22 electrolyze the silver powder wastewater entering the first pool body 11 to generate hydroxide;

[0067] Step 2, part of the generated hydroxide floats upward to the liquid surface of the silver powder wastewater, and the part of the hydroxide merges with another stream of the silver powder wastewater and enters the second tank body 12, and the stirring component 4 stirs and flocculates the silver powder wastewater and the hydroxide entering the second tank body 12 to obtain a pretreated liquid;

[0068] Step 3, the pre-treated liquid is filtered through the filter screen 52 and then passed into the first tube body 511. The pre-treated liquid reaches the liquid outlet 513 and is divided into two streams under the action of the partition 53, one of which enters the second tube body 512 through the outlet a5131, and the other pre-treated liquid is discharged into the third pool body 13 through the outlet b5132;

[0069] Step 4, the pretreatment liquid entering the second tube body 512 flows into the cleaning chamber 31, and then the cleaning pump 32 pumps the pretreatment liquid in the cleaning chamber 31 upward into the electrode chamber 22. The pretreatment liquid flushes the electrode chamber 22 and the plurality of electrode sheets 23 during the flow, and the hydroxide in the electrode chamber 22 and the hydroxide adhered to the plurality of electrode sheets 23 are flushed into the second cell body 12;

[0070] Step 5, repeat steps 2-4 until all the silver powder wastewater is treated.

[0071] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pretreatment device for silver powder wastewater, comprising a treatment tank (1) and an electrode assembly (2) arranged in the treatment tank (1), characterized in that: The electrode assembly (2) comprises a mounting shell (21), an electrode cavity (22) opened in the mounting shell (21), and a plurality of electrode sheets (23) accommodated in the electrode cavity (22), wherein the electrode cavity (22) is connected to the treatment tank (1), and the pretreatment device further comprises a cleaning assembly (3) arranged in the treatment tank (1) and below the mounting shell (21), wherein the cleaning assembly (3) comprises a cleaning cavity (31) for introducing and storing liquid, a cleaning pump (32) arranged in the cleaning cavity (31), and a cleaning pipe (33) one end of which is connected to the cleaning pump (32), and the other end of the cleaning pipe (33) is connected to the electrode cavity (22); The electrode assembly (2) further comprises a liquid inlet cavity (24) opened at the bottom of the mounting shell (21), and a plurality of guide plates (25) arranged at intervals in the liquid inlet cavity (24) and distributed in a fan shape, one end of the liquid inlet cavity (24) is connected to the cleaning pipe (33), and the other end is connected to the electrode cavity (22), and the arrangement direction of the plurality of guide plates (25) is perpendicular to the direction from one end to the other end of the liquid inlet cavity (24); The electrode assembly (2) further comprises a liquid outlet groove (26) which is provided on the bottom wall of the electrode cavity (22) and is connected to the liquid inlet cavity (24); the liquid outlet groove (26) extends along the arrangement direction of the plurality of guide plates (25); the plurality of electrode sheets (23) are all arranged upright; a conical first guide block (27) is respectively arranged at the lower end of each electrode sheet (23); the plurality of first guide blocks (27) are inserted into the liquid outlet groove (26) at intervals along the extension direction of the liquid outlet groove (26); a second guide block (28) is further arranged between each two adjacent electrode sheets (23); and both sides of the lower end of the second guide block (28) respectively have arc-shaped guide surfaces; The treatment pool (1) comprises a first pool body (11) and a second pool body (12) arranged side by side, the upper end of the first pool body (11) and the upper end of the second pool body (12) are connected to each other, the electrode assembly (2) is accommodated in the first pool body (11), and a stirring assembly (4) is arranged in the second pool body (12). The pretreatment device also comprises an infusion assembly (5), and the infusion assembly (5) comprises a plurality of infusion tubes (51), and the two ends of the infusion tubes (51) respectively have a first tube end and a second tube end, the first tube end is located in the second pool body (12) and a filter screen (52) is provided on the first tube end, and the second tube end is connected to the cleaning chamber (31).

2. The pretreatment device for silver powder wastewater according to claim 1, characterized in that: The mounting shell (21) comprises a plurality of shells (211) stacked up and down, each of the shells (211) being provided with the electrode cavity (22), at least one side of the shell (211) being provided with a through opening (212) for connecting the electrode cavity (22) and the treatment pool (1), a guide plate (29) being provided on the shell (211) on the side of the through opening (212), and the guide plate (29) being inclined outwardly in a bottom-up direction.

3. The pretreatment device for silver powder wastewater according to claim 1, characterized in that: The treatment pool (1) further comprises a third pool body (13) connected to the second pool body (12); the liquid delivery tube (51) comprises a first tube body (511) and a second tube body (512); the first tube end is located on the first tube body (511); the second tube end is located on the second tube body (512); a liquid outlet (513) is provided at one end of the first tube body (511) away from the first tube end; a partition (53) is provided inside the liquid outlet (513); the partition (53) divides the liquid outlet (513) into an outlet a (5131) and an outlet b (5132); the outlet a (5131) is connected to the second tube body (512); and the outlet b (5132) is connected to the third pool body (13).

4. The pretreatment device for silver powder wastewater according to claim 3, characterized in that: The liquid outlet (513) is arranged toward the third tank body (13), and an extrusion portion (54) is arranged on at least one side wall of the outlet b (5132), and the extrusion portion (54) is inclined inwardly along the opening direction of the liquid outlet (513).

5. The pretreatment device for silver powder wastewater according to claim 3, characterized in that: The pretreatment device also includes a plurality of liquid outlet channels (14) opened on the second pool body (12) and connected to the third pool body (13); a plurality of the first tube bodies (511) are respectively and correspondingly arranged in the plurality of liquid outlet channels (14); the stirring assembly (4) includes a plurality of stirring paddles (41) rotatably arranged around their own axial centerline directions, and a power module (42) for driving the stirring paddles (41) to rotate; the plurality of stirring paddles (41) correspond one-to-one to the plurality of first tube bodies (511); one end of each of the stirring paddles (41) has a connecting end rotatably connected to the first tube end; the connecting end is located in the liquid outlet channel (14); a plurality of blades (43) are arranged at intervals on the peripheral side of the connecting end; the blades (43) are curved, and the bending directions of the plurality of blades (43) are the same.

6. The pretreatment device for silver powder wastewater according to claim 3, characterized in that: The pretreatment device also includes a scum assembly (6) arranged in the third tank body (13), the scum assembly (6) including a first baffle (61) and a second baffle (62) arranged in a direction away from the second tank body (12), the first baffle (61) and the second baffle (62) are both arranged upright, a scum cavity (63) is formed between the first baffle (61) and the second baffle (62), the upper end surface of the first baffle (61) is inclined downward in a direction close to the second baffle (62), a scum plate (64) is provided at the upper end of the second baffle (62), the scum plate (64) is suspended above the scum cavity (63) and is inclined upward in a direction from the first baffle (61) to the second baffle (62).

7. A method for pretreating silver powder wastewater, characterized in that: The pretreatment method is based on the pretreatment device according to any one of claims 3 to 6, and comprises the following steps: Step 1, introducing silver powder wastewater into a treatment pool (1), wherein the silver powder wastewater is divided into two streams, one of which enters a first pool body (11), and a plurality of electrode sheets (23) in an electrode cavity (22) electrolyze the silver powder wastewater entering the first pool body (11) to generate hydroxide; Step 2, the generated part of the hydroxide floats upward to the liquid surface of the silver powder wastewater, and the part of the hydroxide merges with another stream of the silver powder wastewater and enters the second tank body (12), and the stirring component (4) stirs and flocculates the silver powder wastewater and the hydroxide entering the second tank body (12) to obtain a pretreated liquid; Step 3, filtering the pre-treated liquid through the filter screen (52) and passing it into the first tube body (511), the pre-treated liquid reaches the liquid outlet (513) and is divided into two streams under the action of the partition (53), one of which enters the second tube body (512) through the outlet a (5131), and the other pre-treated liquid is discharged into the third pool body (13) through the outlet b (5132); Step 4, the pretreatment liquid entering the second tube body (512) flows into the cleaning chamber (31), and then the cleaning pump (32) pumps the pretreatment liquid in the cleaning chamber (31) upward into the electrode chamber (22). During the flow of the pretreatment liquid, the electrode chamber (22) and the plurality of electrode sheets (23) are flushed, and the remaining hydroxide in the electrode chamber (22) and the hydroxide adhering to the plurality of electrode sheets (23) are flushed into the second cell body (12); Step 5, repeat steps 2-4 until all the silver powder wastewater is treated.

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