Metal pipe fitting pickling passivation waste liquid treatment device and treatment method

Abstract

The invention discloses a metal pipe fitting pickling passivation waste liquid treatment device and method, and relates to the technical field of pipe fitting production waste liquid treatment.The metal pipe fitting pickling passivation waste liquid treatment device is characterized in that a neutralizing agent is injected into a waste liquid input pipe through a plurality of agent increasing nozzles, the agent and waste liquid are naturally and evenly mixed in the conveying process, and therefore neutralizing treatment can be completed while conveying is conducted; the aim of adding a neutralizing agent into the neutralizing tank and uniformly mixing for reaction is fulfilled, meanwhile, the cost for constructing the neutralizing tank can be saved, and the cost of the metal pipe fitting pickling passivation waste liquid treatment device is reduced; the plurality of settling ponds meet the requirements of continuously inputting neutralized waste liquid and discharging settled waste liquid and solid waste, and can be continuously recycled; the multiple first sedimentation tanks are sequentially switched for use, so that the purpose of continuously treating the waste liquid can be achieved, the continuous waste liquid treatment operation is achieved, the waiting time during sedimentation is saved, and the acid pickling passivation waste liquid treatment efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste liquid treatment in pipe fitting production, and in particular to a device and method for treating waste liquid from pickling and passivation of metal pipe fittings. Background Art

[0002] In order to improve the corrosion resistance of stainless steel pipes, the usual practice is to pickle and passivate the stainless steel pipes after completion, remove the oxide scale produced by welding and high-temperature processing, make it silvery and shiny, and form a layer of oxide film with chromium as the main substance on the surface after treatment, so that no secondary oxidation corrosion will occur, and the purpose of passivation is achieved, thereby improving the surface corrosion resistance of stainless steel pipes and extending the service life of the pipes. At the same time, the stainless steel pipes after pickling and passivation have a uniform color in appearance, and the aesthetic performance of the product is also improved. Therefore, pickling and passivation of stainless steel pipes is a widely used treatment method and process.

[0003] Conventional treatment methods for the waste liquid from pickling and passivation of stainless steel pipes are to discharge it directly or mix it with other production water and then dilute and discharge it or collect it and then simply adjust the pH before discharging it, which is not conducive to environmental protection, comprehensive utilization of water resources, and increases production costs.

[0004] To solve the above problems, a stainless steel pickling and passivation waste liquid treatment device is disclosed in the patent document with the publication number of "CN207918645U", including a pickling and passivation cleaning water recycling device and a pickling and passivation final waste liquid treatment device, the pickling and passivation cleaning water recycling device includes a pickling water collection tank, a pickling water delivery pump, a recovery and dosing regulating water tank, a clean water reuse water tank, and a cleaning water pump, and the pickling and passivation final waste liquid treatment device includes a self-cleaning filter, an MBR membrane tank, a self-priming pump, an MBR backwash pump, an MBR water production tank, a reverse osmosis water supply pump, a security filter, a reverse osmosis high-pressure pump, and a reverse osmosis membrane assembly. The flushing water can be recycled and reused in the stainless steel pickling and passivation production process, and it can be treated after repeated use to concentrate and reduce emissions.

[0005] Based on the above search and in combination with the prior art, it is found that the pickling and passivation waste liquid in the prior art usually needs to be neutralized during the treatment process, and then further adsorbed and filtered after precipitation to meet the corresponding emission standards. During the treatment process, since the neutralization requires the pickling and passivation waste liquid to be evenly mixed with the neutralizer to achieve a good reaction effect, the pickling and passivation waste liquid and the neutralizer need to be disturbed and mixed. This process is carried out in the operating pool and takes a certain amount of time. The neutralized waste liquid enters the sedimentation tank and needs a certain amount of time to precipitate before it can enter the next treatment process. Neutralization and precipitation take up a lot of processing time, which makes the overall processing time longer and the processing efficiency lower. Therefore, a metal pipe pickling and passivation waste liquid treatment device and treatment method are needed. Summary of the invention

[0006] The purpose of the present application is to provide a device and method for treating metal pipe pickling and passivation waste liquid to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solution: a metal pipe pickling passivation waste liquid treatment device, comprising:

[0008] A waste liquid input pipe, which is used to transport waste liquid;

[0009] Sedimentation tanks, where multiple sedimentation tanks are provided, and the multiple sedimentation tanks are connected to the output end of the waste liquid input pipe through multiple pipelines respectively, and the sedimentation tanks are used to store the neutralized waste liquid for sedimentation;

[0010] An adsorption tower, the input end of which is connected to the liquid output ends of the plurality of sedimentation tanks through a pipeline;

[0011] An ultrafiltration membrane separation device, wherein the input end of the ultrafiltration membrane separation device is connected to the output end of the adsorption tower through a pipeline, and the output end of the ultrafiltration membrane separation device is connected to a sewage pipeline;

[0012] A solid waste bin, the input end of which is connected to the solid output ends of a plurality of sedimentation tanks through a pipeline;

[0013] Among them, a mixing tube is arranged in the middle of the waste liquid input pipe, a ring tube is fixedly sleeved on the mixing tube, the input end of the ring tube transports a neutralizing agent for neutralizing the waste liquid into the ring tube through a pipeline, and a plurality of agent-enhancing nozzles are fixed on the ring tube, and the plurality of agent-enhancing nozzles are fixedly penetrated through the mixing tube and extend into the mixing tube, and the plurality of agent-enhancing nozzles are evenly distributed along the circumference of the ring tube;

[0014] Solenoid valves are provided on multiple pipes connecting the waste liquid input pipe and the multiple sedimentation tanks;

[0015] In addition, sewage pumps are installed on the waste liquid input pipe, the pipe connecting the sedimentation tank and the adsorption tower, the pipe connecting the sedimentation tank and the solid waste bin, and the pipe connecting the adsorption tower and the ultrafiltration membrane separation equipment to obtain power for transporting the waste liquid.

[0016] As a further supplement to the present solution, the plurality of agent-enhancing nozzles are all arranged at an angle, and the plurality of agent-enhancing nozzles are all inclined toward the direction in which the wastewater moves.

[0017] As a further supplement to the present solution, the plurality of agent-enhancing nozzles are also tilted and offset from the central axis of the mixing tube, so that the plurality of agent-enhancing nozzles form a spiral scattering distribution on the cross section of the mixing tube.

[0018] As a further supplement to this solution, two annular tubes are provided, and the end of the nozzle of the agent-increasing nozzle on one of the annular tubes is located near the peripheral side of the inner wall of the mixing tube;

[0019] The nozzle end of the agent-increasing nozzle on the other annular tube is located on the inner side close to the central axis of the mixing tube;

[0020] The multiple agent-enhancing nozzles on the two annular tubes are staggeredly distributed in the axial direction.

[0021] As a further improvement of the present application, a guide plate is fixed on the inner wall of the mixing tube on the side of the agent-enhancing nozzle facing the wastewater flow direction, and the guide plate is an arc-shaped plate. A plurality of guide plates are provided and are evenly distributed along the circumference of the inner wall of the mixing tube;

[0022] The plurality of guide plates are scattered and distributed in a spiral shape, and ends of the plurality of guide plates away from the inner wall of the mixing tube all extend toward the central axis of the mixing tube.

[0023] As a further supplement to this solution, a diverter column is fixed in the mixing tube through a support rod, the middle of the diverter column is located between the multiple guide plates, and the diverter column is coaxially arranged with the mixing tube;

[0024] A conical head is formed at one end of the diverter column facing the waste liquid, and the end of the conical head extends between the plurality of agent-enhancing nozzles.

[0025] As a further supplement to the present solution, a spoiler groove is provided on the peripheral surface of the diverter column. There are multiple spoiler grooves and they are distributed in a circular array along the axis of the diverter column. The extension direction of the multiple spoiler grooves is opposite to the offset direction of the agent enhancer nozzle or the guide plate.

[0026] A method for treating waste liquid from pickling and passivation of metal pipe fittings is applied to a device for treating waste liquid from pickling and passivation of metal pipe fittings as described above, and comprises the following steps:

[0027] Step 1: transporting waste liquid through the waste liquid input pipe, and injecting neutralizing agent into the waste liquid input pipe through multiple agent-increasing nozzles during the transportation process, so that the agent and the waste liquid are naturally mixed evenly during the transportation process;

[0028] Step 2: The neutralized waste liquid is transported to a sedimentation tank through one of the pipelines for sedimentation;

[0029] Step 3: At this time, the neutralized waste liquid is continuously transported to another sedimentation tank through the waste liquid input pipe, and multiple pipes between the waste liquid input pipe and the sedimentation tank are opened or cut off in sequence, so that the neutralized waste liquid is injected into multiple sedimentation tanks in sequence;

[0030] Step 4: After the waste liquid in the first sedimentation tank is precipitated, the upper layer of liquid is transported to the adsorption tower through a pipeline, and the adsorption tower is used to adsorb other harmful substances in the waste liquid;

[0031] The solid waste in the lower layer is transported to the solid waste bin through pipelines for storage, and the other sedimentation tanks complete sedimentation in turn and discharge liquid and solid separately;

[0032] Step 5: The waste liquid after adsorption treatment enters the ultrafiltration membrane separation equipment through the adsorption tower through a pipeline for ultrafiltration treatment, so as to meet the emission standards and can be discharged;

[0033] Among them, multiple sedimentation tanks can meet the needs of continuously inputting neutralized waste liquid and discharging precipitated waste liquid and solid waste, and can form continuous recycling.

[0034] In summary, the technical effects and advantages of the present invention are as follows:

[0035] 1. In the present invention, a neutralizing agent is injected into the waste liquid input pipe through multiple agent-increasing nozzles, and the agent and the waste liquid are naturally mixed evenly during the transportation process, so that the neutralization treatment can be completed while being transported, saving the purpose of adding an additional neutralizing agent in the neutralization tank and mixing for reaction, and also saving the cost of building a neutralization tank, thereby reducing the cost of the metal pipe pickling passivation waste liquid treatment device;

[0036] Multiple sedimentation tanks can meet the needs of continuously inputting neutralized waste liquid and discharging precipitated waste liquid and solid waste, and can form continuous recycling; the sequential switching of multiple first sedimentation tanks can achieve the purpose of uninterrupted and continuous treatment of waste liquid, thereby realizing continuous waste liquid treatment operations, saving waiting time during sedimentation, and greatly improving the efficiency of pickling and passivation waste liquid treatment.

[0037] 2. In the present invention, by setting two groups of agent-increasing nozzles, the neutralizing agent can be directly delivered to various areas in the mixing tube, thereby further improving the uniformity of the neutralizing agent in the waste liquid, achieving the purpose of further improving the mixing speed of the neutralizing agent and the waste liquid, which is more conducive to improving the efficiency of the neutralization treatment and at the same time can improve the effect of the neutralization treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 Schematic diagram of the three-dimensional structure of the mixing tube and the ring tube in Example 1;

[0041] Figure 3 This is a schematic diagram of the cross-sectional structure of the mixing tube in Example 1;

[0042] Figure 4 It is a right view structural schematic diagram in Example 1;

[0043] Figure 5 This is a schematic diagram of the cross-sectional structure of the mixing tube in Example 2;

[0044] Figure 6 It is a right view structural schematic diagram in Example 2;

[0045] Figure 7 This is a schematic diagram of the cross-sectional structure of the mixing tube in Example 3.

[0046] In the figure: 1. Waste liquid inlet pipe; 2. Sedimentation tank; 3. Mixing pipe; 4. Adsorption tower; 5. Ultrafiltration membrane separation equipment; 6. Solid waste bin; 7. Ring pipe; 8. Additive nozzle; 9. Guide plate; 10. Diverter column; 11. Disturbing groove; 12. Conical head; 13. Flow-extending swirl plate. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] refer to Figure 1-Figure 2 The device for treating waste liquid from pickling and passivation of metal pipes shown in the figure comprises a waste liquid input pipe 1, a sedimentation tank 2, an adsorption tower 4, an ultrafiltration membrane separation device 5 and a solid waste bin 6;

[0050] The waste liquid input pipe 1 is used to transport waste liquid; a plurality of sedimentation tanks 2 are provided, and the plurality of sedimentation tanks 2 are respectively connected to the output end of the waste liquid input pipe 1 through a plurality of pipes, and the sedimentation tanks 2 are used to store the neutralized waste liquid for sedimentation;

[0051] The input end of the adsorption tower 4 is connected to the liquid output ends of the plurality of sedimentation tanks 2 through a pipeline;

[0052] The input end of the ultrafiltration membrane separation device 5 is connected to the output end of the adsorption tower 4 through a pipeline, and the output end of the ultrafiltration membrane separation device 5 is connected to the sewage pipeline;

[0053] The input end of the solid waste bin 6 is connected to the solid output ends of the plurality of sedimentation tanks 2 through a pipeline;

[0054] Among them, a mixing tube 3 is arranged in the middle of the waste liquid input pipe 1, and a ring tube 7 is fixedly sleeved on the mixing tube 3. The input end of the ring tube 7 transports a neutralizing agent for neutralizing the waste liquid into the ring tube 7 through a pipeline, and a plurality of agent-enhancing nozzles 8 are fixed on the ring tube 7. The plurality of agent-enhancing nozzles 8 are fixedly penetrated through the mixing tube 3 and extend into the mixing tube 3, and the plurality of agent-enhancing nozzles 8 are evenly distributed along the circumference of the ring tube 7;

[0055] Solenoid valves are provided on the multiple pipes connecting the waste liquid input pipe 1 and the multiple sedimentation tanks 2;

[0056] In addition, sewage pumps (not shown in the figure, or other suitable pump bodies commonly used in the prior art may be used) are provided on the waste liquid inlet pipe 1, the pipeline connecting the sedimentation tank 2 and the adsorption tower 4, the pipeline connecting the sedimentation tank 2 and the solid waste bin 6, and the pipeline connecting the adsorption tower 4 and the ultrafiltration membrane separation equipment 5, so as to obtain power for transporting the waste liquid.

[0057] Based on the above structure, waste liquid is transported through the waste liquid input pipe 1, and a neutralizing agent is injected into the waste liquid input pipe 1 through a plurality of agent-increasing nozzles 8 during the transportation process, and the agent and the waste liquid are naturally mixed and uniformly mixed during the transportation process; the neutralized waste liquid is transported to the sedimentation tank 2 through one of the pipes for precipitation; at this time, the neutralized waste liquid is continued to be transported to another sedimentation tank 2 through the waste liquid input pipe 1, and a plurality of pipes between the waste liquid input pipe 1 and the sedimentation tank 2 are opened or cut off in turn, so that the neutralized waste liquid is injected into a plurality of sedimentation tanks 2 in turn; wherein, the plurality of sedimentation tanks 2 meet the requirement of continuous input of the neutralized waste liquid The waste liquid and solid waste after the precipitation are discharged, and continuous recycling can be formed, so that the neutralization treatment can be completed while conveying, saving the purpose of adding an additional neutralizing agent in the neutralization tank and mixing for reaction, and at the same time, it can also save the cost of building a neutralization tank, and reduce the cost of the metal pipe pickling passivation waste liquid treatment device. In addition, by switching and using multiple first sedimentation tanks 2 in sequence, the purpose of continuous treatment of waste liquid can be achieved without interruption, thereby realizing continuous waste liquid treatment operations, saving waiting time during precipitation, and greatly improving the efficiency of pickling passivation waste liquid treatment;

[0058] After the waste liquid in the first sedimentation tank 2 is precipitated, the upper layer of liquid is transported to the adsorption tower 4 through a pipeline, and the adsorption tower 4 is used to adsorb other harmful substances in the waste liquid; the lower layer of solid waste is transported to the solid waste bin 6 through a pipeline for storage, and the other sedimentation tanks 2 complete the precipitation in turn and discharge the liquid and solid respectively; the waste liquid after adsorption treatment enters the ultrafiltration membrane separation equipment 5 from the adsorption tower 4 through a pipeline for ultrafiltration treatment, thereby completing the treatment of the pickling passivation waste liquid, so that the waste liquid meets the discharge standard and can be discharged.

[0059] like Figure 2-Figure 3 As shown, the multiple agent-enhancing nozzles 8 are all arranged obliquely, and the multiple agent-enhancing nozzles 8 are all inclined toward the direction of wastewater movement;

[0060] The multiple agent-enhancing nozzles 8 are also offset and tilted from the central axis of the mixing tube 3 , and the multiple agent-enhancing nozzles 8 form a spiral scattering distribution on the cross section of the mixing tube 3 .

[0061] After being tilted, multiple agent-increasing nozzles 8 can inject neutralizing agent into the flowing waste liquid with less interference, and can make the neutralizing agent blend into the waste liquid in an inclined flow direction, and mix more evenly with the waste liquid during the flow process, so as to achieve the purpose of quickly and evenly adding neutralizing agent to the waste liquid during the transportation of the waste liquid, and can make the neutralizing agent quickly and evenly mix with the waste liquid to complete the neutralization treatment, improve the efficiency of the neutralization treatment, and thus improve the efficiency of the overall pickling and passivation waste liquid treatment.

[0062] A method for treating waste liquid from pickling and passivation of metal pipe fittings is applied to a device for treating waste liquid from pickling and passivation of metal pipe fittings as described above, and comprises the following steps:

[0063] Step 1: transporting waste liquid through the waste liquid input pipe 1, and injecting a neutralizing agent into the waste liquid input pipe 1 through a plurality of agent-increasing nozzles 8 during the transport process, so that the agent and the waste liquid are naturally mixed evenly during the transport process;

[0064] Step 2: The neutralized waste liquid is transported to the sedimentation tank 2 through one of the pipelines for sedimentation;

[0065] Step 3: At this time, the neutralized waste liquid is continuously transported to another sedimentation tank 2 through the waste liquid input pipe 1, and multiple pipes between the waste liquid input pipe 1 and the sedimentation tank 2 are opened or cut off in sequence, so that the neutralized waste liquid is injected into multiple sedimentation tanks 2 in sequence;

[0066] Step 4: After the waste liquid in the first sedimentation tank 2 is precipitated, the upper layer of liquid is transported to the adsorption tower 4 through a pipeline, and the adsorption tower 4 is used to adsorb other harmful substances in the waste liquid;

[0067] The solid waste in the lower layer is transported to the solid waste bin 6 through a pipeline for storage, and the other sedimentation tanks 2 complete sedimentation in turn and discharge liquid and solid respectively;

[0068] Step 5: The waste liquid after adsorption treatment enters the ultrafiltration membrane separation device 5 through the adsorption tower 4 through a pipeline for ultrafiltration treatment, so as to meet the emission standards and can be discharged;

[0069] Among them, multiple sedimentation tanks 2 meet the needs of continuously inputting neutralized waste liquid and discharging precipitated waste liquid and solid waste, and can form continuous recycling.

[0070] like Figure 2 As shown, two ring tubes 7 are provided, and the nozzle end of the agent-increasing nozzle 8 on one of the ring tubes 7 is located near the peripheral side of the inner wall of the mixing tube 3;

[0071] The nozzle end of the agent-increasing nozzle 8 on the other annular tube 7 is located on the inner side close to the central axis of the mixing tube 3;

[0072] The multiple agent-enhancing nozzles 8 on the two annular tubes 7 are staggeredly distributed in the axial direction.

[0073] By setting up two groups (or more groups) of agent-enhancing nozzles 8, the neutralizing agent can be directly transported to various areas in the mixing tube 3 (i.e., multiple areas between the center and the circumference of the cross section), thereby further improving the uniformity of the neutralizing agent in the waste liquid, thereby achieving the purpose of further improving the mixing speed of the neutralizing agent and the waste liquid, which is more conducive to improving the efficiency of the neutralization treatment and at the same time can improve the effect of the neutralization treatment.

[0074] Example 2

[0075] refer to Figure 1-Figure 2 The device for treating waste liquid from pickling and passivation of metal pipes shown in the figure has a guide plate 9 fixed on the inner wall of the mixing tube 3 on the side of the agent-enhancing nozzle 8 facing the flow direction of the wastewater. The guide plate 9 is an arc-shaped plate. A plurality of guide plates 9 are provided and are evenly distributed along the circumference of the inner wall of the mixing tube 3.

[0076] The plurality of guide plates 9 are scattered and distributed in a spiral shape, and the ends of the plurality of guide plates 9 away from the inner wall of the mixing tube 3 all extend toward the central axis of the mixing tube 3 .

[0077] By setting the guide plate 9, the waste liquid in the mixing tube 3 can be guided, so that the waste liquid in the mixing tube 3 forms a rotating flow, so that the waste liquid and the neutralizing agent can be evenly mixed, which can also achieve the purpose of improving the mixing efficiency and thus improving the neutralization treatment efficiency. In addition, eliminating a group of agent-enhancing nozzles 8 can reduce the number of openings in the mixing tube 3, and the process is simpler when processing the mixing tube 3, and the sealing requirements are lower, which can also reduce the processing and manufacturing requirements.

[0078] like Figure 2-Figure 3As shown, a diverter column 10 is fixed in the mixing tube 3 through a support rod, the middle of the diverter column 10 is located between the multiple guide plates 9, and the diverter column 10 is coaxially arranged with the mixing tube 3;

[0079] A conical head 12 is formed at one end of the diverter column 10 facing the waste liquid, and the end of the conical head 12 extends between the multiple agent-enhancing nozzles 8;

[0080] By setting the diverter column 10, the waste liquid and the neutralizing agent mixed in the waste liquid can be diverted, so that the mixed liquid of the waste liquid and the neutralizing agent is more closely attached to the multiple guide plates 9, thereby enhancing the turbulence effect of the guide plates 9. In addition, the flow cross-section at this location is reduced, so the flow rate is accelerated, so that the waste liquid and the neutralizing agent can be evenly mixed in a short time, and the mixing effect is further improved.

[0081] like Figure 2-Figure 3 As shown, the peripheral surface of the diverter column 10 is provided with a spoiler groove 11, and a plurality of spoiler grooves 11 are provided and distributed in a circular array along the axis of the diverter column 10, and the extension direction of the plurality of spoiler grooves 11 is opposite to the offset direction of the agent-enhancing nozzle 8 or the guide plate 9;

[0082] By setting the spoiler groove 11, the waste liquid in the rotating flow can be slightly disturbed, so that a small convection is formed between the inner and outer layers of the waste liquid, thereby making the mixing of the waste liquid and the neutralizing agent more uniform, further improving the efficiency and effect of the neutralization treatment, and facilitating better neutralization treatment of the pickling passivation waste liquid.

[0083] Example 3

[0084] The staff can also set the homogenization structure in the mixing tube 3 to other forms according to the actual use requirements to achieve the purpose of uniformly mixing the neutralizing agent and the waste liquid, such as:

[0085] refer to Figure 7 The device for treating waste liquid from pickling and passivation of metal pipes shown in the figure is different from that of Examples 1 and 2 in that the ring tube 7 is eliminated, and a plurality of agent-enhancing nozzles 8 are directly fixed and penetrate the upper end of the mixing tube 3, and are arranged in sequence along the axial direction of the mixing tube 3. A diverter column 10 coaxially arranged with the mixing tube 3 is arranged inside the mixing tube 3, and a flow-extending vortex plate 13 is arranged between the diverter column 10 and the inner side of the mixing tube 3. The inner and outer side walls of the flow-extending vortex plate 13 are respectively fixed to the diverter column 10 and the mixing tube 3, so that a spirally extending pipeline is formed between the diverter column 10 and the mixing tube 3. At this time, the agent-enhancing nozzles 8 are arranged at intervals between the spiral gaps of the flow-extending vortex plate 13, so that the neutralizing agent can flow and mix with the spirally flowing waste liquid after being injected into the mixing tube 3, and the purpose of mixing can also be achieved, thereby meeting the needs of improving the efficiency and effect of the neutralization treatment.

[0086] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal pipe pickling passivation waste liquid treatment device, characterized in that: include: A waste liquid input pipe (1), wherein the waste liquid input pipe (1) is used to transport waste liquid; A sedimentation tank (2), wherein a plurality of the sedimentation tanks (2) are provided, and the plurality of sedimentation tanks (2) are respectively connected to the output end of the waste liquid input pipe (1) through a plurality of pipelines, and the sedimentation tank (2) is used to store the neutralized waste liquid for sedimentation; An adsorption tower (4), wherein an input end of the adsorption tower (4) is connected to liquid output ends of a plurality of sedimentation tanks (2) via a pipeline; An ultrafiltration membrane separation device (5), wherein the input end of the ultrafiltration membrane separation device (5) is connected to the output end of the adsorption tower (4) through a pipeline, and the output end of the ultrafiltration membrane separation device (5) is connected to a sewage discharge pipeline; A solid waste bin (6), the input end of which is connected to the solid output ends of the plurality of sedimentation tanks (2) via a pipeline; A mixing tube (3) is arranged in the middle of the waste liquid input pipe (1), a ring tube (7) is fixedly sleeved on the mixing tube (3), a neutralizing agent for neutralizing the waste liquid is transported into the ring tube (7) through a pipeline at the input end of the ring tube (7), a plurality of agent-increasing nozzles (8) are fixed on the ring tube (7), the plurality of agent-increasing nozzles (8) are fixedly passed through the mixing tube (3) and extend into the mixing tube (3), and the plurality of agent-increasing nozzles (8) are evenly distributed along the circumference of the ring tube (7); Solenoid valves are provided on the multiple pipes connecting the waste liquid input pipe (1) and the multiple sedimentation tanks (2); In addition, sewage pumps are provided on the waste liquid input pipe (1), the pipe connecting the sedimentation tank (2) and the adsorption tower (4), the pipe connecting the sedimentation tank (2) and the solid waste bin (6), and the pipe connecting the adsorption tower (4) and the ultrafiltration membrane separation device (5), so as to obtain power for transporting the waste liquid.

2. A metal pipe pickling passivation waste liquid treatment device according to claim 1, characterized in that: The plurality of agent-enhancing nozzles (8) are all arranged at an inclination, and the plurality of agent-enhancing nozzles (8) are all inclined towards the direction in which the wastewater moves.

3. A metal pipe pickling passivation waste liquid treatment device according to claim 2, characterized in that: The plurality of agent-enhancing nozzles (8) are also offset and tilted from the central axis of the mixing tube (3), and the plurality of agent-enhancing nozzles (8) form a spiral scattering distribution on the cross section of the mixing tube (3).

4. A metal pipe pickling passivation waste liquid treatment device according to claim 3, characterized in that: Two annular tubes (7) are provided, and the nozzle end of the agent-increasing nozzle (8) on one of the annular tubes (7) is located near the circumferential side of the inner wall of the mixing tube (3); The nozzle end of the agent-increasing nozzle (8) on the other annular tube (7) is located on the inner side close to the central axis of the mixing tube (3); The multiple agent-enhancing nozzles (8) on the two annular tubes (7) are staggeredly distributed in the axial direction.

5. A metal pipe pickling passivation waste liquid treatment device according to claim 3, characterized in that: A guide plate (9) is fixed on the inner wall of the mixing tube (3) at the side of the agent-enhancing nozzle (8) facing the flow direction of the wastewater, and the guide plate (9) is an arc-shaped plate. A plurality of guide plates (9) are provided and are evenly distributed along the circumference of the inner wall of the mixing tube (3); The plurality of guide plates (9) are scattered and distributed in a spiral shape, and the ends of the plurality of guide plates (9) away from the inner wall of the mixing tube (3) all extend towards the central axis of the mixing tube (3).

6. A metal pipe pickling passivation waste liquid treatment device according to claim 5, characterized in that: A flow dividing column (10) is fixed in the mixing tube (3) via a support rod, the middle of the flow dividing column (10) is located between the plurality of guide plates (9), and the flow dividing column (10) is coaxially arranged with the mixing tube (3); A conical head (12) is formed at one end of the diverter column (10) facing the waste liquid, and the end of the conical head (12) extends between the plurality of agent-enhancing nozzles (8).

7. A metal pipe pickling passivation waste liquid treatment device according to claim 6, characterized in that: The peripheral surface of the diverter column (10) is provided with a flow disturbance groove (11), and the flow disturbance groove (11) is provided in plurality and distributed in a circular array along the axis of the diverter column (10), and the extension direction of the plurality of flow disturbance grooves (11) is opposite to the offset direction of the agent-enhancing nozzle (8) or the guide plate (9).

8. A method for treating waste liquid from pickling and passivation of metal pipe fittings, applied to a device for treating waste liquid from pickling and passivation of metal pipe fittings as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: transporting waste liquid through the waste liquid input pipe (1), and injecting a neutralizing agent into the waste liquid input pipe (1) through a plurality of agent-increasing nozzles (8) during the transport process, so that the agent and the waste liquid are naturally mixed and uniformly mixed during the transport process; Step 2: The neutralized waste liquid is transported to a sedimentation tank (2) through one of the pipelines for sedimentation; Step 3: At this time, the neutralized waste liquid continues to be transported to another sedimentation tank (2) through the waste liquid input pipe (1), and multiple pipes between the waste liquid input pipe (1) and the sedimentation tank (2) are opened or cut off in sequence, so that the neutralized waste liquid is injected into multiple sedimentation tanks (2) in sequence; Step 4: After the waste liquid in the first sedimentation tank (2) is precipitated, the upper layer of liquid is transported to the adsorption tower (4) through a pipeline, and the adsorption tower (4) is used to adsorb other harmful substances in the waste liquid; The solid waste in the lower layer is transported to the solid waste bin (6) through a pipeline for storage, and the other sedimentation tanks (2) complete sedimentation in turn and discharge liquid and solid respectively; Step 5: The waste liquid after adsorption treatment enters the ultrafiltration membrane separation device (5) through the pipeline from the adsorption tower (4) for ultrafiltration treatment, so as to meet the emission standards and can be discharged; The plurality of sedimentation tanks (2) can meet the requirements of continuously inputting neutralized waste liquid and discharging precipitated waste liquid and solid waste, and can form a continuous cycle.

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