Treatment and recycling method and treatment and recycling device for metal surface treatment liquid

Abstract

The invention relates to a method and a device for treating and recycling metal surface treatment liquid. The treatment and reuse method of the metal surface treatment liquid comprises the following steps: S1, adding hydrogen peroxide into the metal surface treatment liquid to carry out oxidation reaction for a set duration, and then adjusting the pH value to a set value; s2, a PAM flocculating agent is added into the metal surface treatment liquid; and S3, solid-liquid separation is conducted on the metal surface treatment liquid. According to the treatment and recycling method and device for the metal surface treatment liquid, the concentration of iron ions in the metal surface treatment liquid can be reduced, the service cycle of the metal surface treatment liquid is prolonged, and the surface treatment effect of the metal surface treatment liquid is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental engineering, and in particular to a treatment and recycling method of metal surface treatment liquid and a treatment and recycling device thereof. BACKGROUND

[0002] Before coating, metal materials are usually treated by chromate passivation or phosphating to improve the corrosion resistance of the substrate and the adhesion of the coating film. Currently, both phosphating and chromate passivation have become obsolete processes, and the application of new environmentally friendly pretreatment processes such as zirconium, silane, and silane-zirconium salt composite is increasing. However, as the use time of the new treatment agent increases, the concentration of iron ions in the treatment liquid increases and gradually exists in the form of particulate matter, affecting the surface treatment effect. Currently, there are two widely used methods, one is to scrap the treatment liquid, but the treatment liquid of individual manufacturers is scrapped too frequently, resulting in high economic cost. The second method is to use a filter for filtration, but due to the presence of colloidal substances, the filter membrane is easily clogged, and there is also a loss of effective components.

[0003] Therefore, it is urgent to develop a new type of metal surface treatment liquid treatment and recycling technology that is effective and feasible, to study the mechanism and separation behavior of the impurity removal technology, to lay a foundation for the popularization and application of new metal surface treatment liquid, and to provide help for the development of metal surface corrosion prevention technology towards green and environmentally friendly direction. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a treatment and recycling method of metal surface treatment liquid and a treatment and recycling device thereof, which can reduce the concentration of iron ions in the metal surface treatment liquid, prolong the service life of the metal surface treatment liquid, and ensure the surface treatment effect.

[0005] Specifically, the present application provides a treatment and recycling method of metal surface treatment liquid, comprising the steps of:

[0006] S1, adding hydrogen peroxide to the metal surface treatment liquid for a set period of oxidation reaction, and adjusting the pH to a set value;

[0007] S2, adding PAM flocculant to the metal surface treatment liquid;

[0008] S3, solid-liquid separation of the metal surface treatment liquid.

[0009] According to an embodiment of the present application, in step S1, the hydrogen peroxide is stirred uniformly after being added to the metal surface treatment liquid, and the set period is 5-60 min.

[0010] According to an embodiment of the present application, in step S1, the set value is 4-7.

[0011] According to one embodiment of the present application, in step S3, the metal surface treatment agent is subjected to solid-liquid separation by precipitation or filtration.

[0012] According to one embodiment of the present application, step S4 is further included, in which acid is added to the metal surface treatment liquid after the solid-liquid separation.

[0013] The present application further provides a metal surface treatment liquid treatment and recycling device, which is suitable for the treatment and recycling method described above, and comprises:

[0014] a water inlet pool for containing the metal surface treatment liquid to be treated;

[0015] a reaction pool in communication with the water inlet pool, a stirrer being arranged in the reaction pool, and the reaction pool being used to introduce the metal surface treatment liquid from the water inlet pool;

[0016] a precipitation pool in communication with the reaction pool, and the precipitation pool being used to introduce the metal surface treatment liquid from the reaction pool;

[0017] a first, second and third feeding port, the first feeding port being used to add the hydrogen peroxide to the reaction pool, the second feeding port being used to add alkali to the reaction pool to adjust the pH of the metal surface treatment liquid, and the third feeding port being used to add PAM flocculant to the reaction pool;

[0018] a control unit electrically connected to the first to third feeding ports, and the control unit being used to control the first to third feeding ports to add the hydrogen peroxide, alkali and PAM flocculant respectively.

[0019] According to one embodiment of the present application, the control unit is electrically connected to the stirrer, and the control unit is used to control the stirrer to perform stirring operation to make the metal surface treatment liquid fully react with the hydrogen peroxide.

[0020] According to one embodiment of the present application, the treatment and recycling device further comprises:

[0021] a water inlet pump arranged in the water inlet pool and a first pipeline in communication with the water inlet pool and reaction pool, and the water inlet pump being used to pump the metal surface treatment liquid in the water inlet pool into the reaction pool through the first pipeline;

[0022] a first water outlet pump arranged in the reaction pool and a second pipeline in communication with the reaction pool and precipitation pool, and the first water outlet pump being used to pump the metal surface treatment liquid treated in the reaction pool into the precipitation pool through the second pipeline;

[0023] The control unit is electrically connected to the inlet pump and the first outlet pump, and the control unit is used to control the operation of the inlet pump and the first outlet pump.

[0024] According to one embodiment of the present invention, the processing and reuse device further includes:

[0025] An effluent tank is connected to the sedimentation tank, and the effluent tank is used to introduce the metal surface treatment liquid from the reaction tank;

[0026] The fourth inlet is used to add acid solution to the outlet pool.

[0027] According to one embodiment of the present invention, the processing and reuse device further includes:

[0028] The second water pump and the third pipeline are provided. The second water pump is installed in the sedimentation tank and the third pipeline connects the sedimentation tank and the effluent tank. The second water pump is used to pump the metal surface treatment liquid after being treated in the sedimentation tank into the effluent tank through the third pipeline.

[0029] The control unit is electrically connected to the second water pump, and the control unit is used to control the operation of the second water pump.

[0030] The present invention provides a method and apparatus for treating and reusing a metal surface treatment solution. The method uses an oxidation-flocculation approach to reduce the iron ion concentration in the metal surface treatment solution while retaining zinc ions and / or aluminum ions, thereby extending the service life of the treatment solution and ensuring the metal surface treatment effect.

[0031] It should be understood that the above general description and the following detailed description of the invention are exemplary and illustrative, and are intended to provide further explanation of the invention as described in the claims. Attached Figure Description

[0032] The accompanying drawings are included to provide further explanation of the invention. They are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention.

[0033] In the attached image:

[0034] Figure 1 A flowchart illustrating a method for treating and reusing a metal surface treatment liquid according to an embodiment of the present invention is shown.

[0035] Figure 2 A schematic diagram of a metal surface treatment liquid treatment and recycling device according to an embodiment of the present invention is shown.

[0036] Figure 3 A schematic diagram of a metal surface treatment liquid treatment and recycling device according to another embodiment of the present invention is shown.

[0037] The above figures include the following reference numerals:

[0038] Processing and reuse device 100

[0039] Inlet Pool 101

[0040] Reaction tank 102

[0041] Mixer 103

[0042] Sedimentation tank 104

[0043] First delivery point 105

[0044] Second delivery port 106

[0045] Third delivery port 107

[0046] Inlet pump 108

[0047] First pipeline 109

[0048] First water pump 110

[0049] Second pipe 111

[0050] Water outlet pool 112

[0051] Fourth delivery port 113

[0052] Second water pump 114

[0053] Third pipeline 115 Detailed Implementation

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0061] Figure 1 A flowchart illustrating a method for treating and reusing a metal surface treatment liquid according to an embodiment of the present invention is shown. As shown, a method for treating and reusing a metal surface treatment liquid includes the following steps:

[0062] S1. After adding hydrogen peroxide to the metal surface treatment solution and performing an oxidation reaction for a set time, the pH is adjusted to the set value. The purpose of adding hydrogen peroxide is to oxidize ferrous iron (Fe2+) in the metal surface treatment solution to ferric iron (Fe3+), and also to break up the complexed iron. Since ferric iron precipitates within the pH range of 1.5 to 4.1, precipitation can be completed at pH 4.1. Zinc ions begin to precipitate above pH 7, and aluminum ions precipitate within the pH range of 5.5 to 8.0. By utilizing the different pH ranges for metal hydroxide precipitation, ferric ions are removed within a specific pH range, while aluminum and / or zinc are retained.

[0063] S2, PAM flocculant is added to the metal surface treatment solution. The PAM flocculant molecular chain contains a certain amount of polar groups, which adsorb solid particles suspended in the water, forming large clumps between the particle bridges, thus accelerating sedimentation.

[0064] S3 performs solid-liquid separation on the metal surface treatment liquid.

[0065] The present invention provides a method for treating and reusing metal surface treatment liquid, which uses hydrogen peroxide for oxidation and combines it with PAM flocculant to effectively reduce the iron ion concentration in the metal surface treatment liquid while retaining zinc and aluminum ions, thereby extending the service life of the metal surface treatment liquid.

[0066] Preferably, in step S1, hydrogen peroxide is added to the metal surface treatment solution and then stirred until homogeneous. Stirring not only accelerates the dissolution rate but also ensures uniform distribution of reactants, preventing excessively high or low concentrations in certain areas, which could affect reaction efficiency and product quality. The oxidation reaction process is set to last 5–60 minutes.

[0067] Preferably, in step S1, the pH value is set to 4–7. When the pH range is 4–7, ferric ions can precipitate, while zinc ions and / or aluminum ions are retained.

[0068] Preferably, in step S3, the metal surface treatment agent is separated into solid and liquid components by precipitation or filtration. The solidified component is a precipitated iron ion condensate, and the liquid component is the treated metal surface treatment agent.

[0069] Preferably, the method for treating and reusing metal surface treatment solution further includes step S4, which involves adding acid to the metal surface treatment solution after solid-liquid separation to make the metal surface treatment solution meet the reuse requirements.

[0070] Figure 2 A schematic diagram of a metal surface treatment liquid treatment and reuse device according to an embodiment of the present invention is shown. As shown, the present invention also provides a metal surface treatment liquid treatment and reuse device 100, applicable to the aforementioned treatment and reuse method. The treatment and reuse device 100 includes:

[0071] The inlet tank 101 is used to contain the surface treatment liquid for the metal to be treated.

[0072] The reaction tank 102 is connected to the inlet tank 101. A stirrer 103 for performing stirring operations is provided in the reaction tank 102. The reaction tank 102 is used to introduce metal surface treatment liquid from the inlet tank 101.

[0073] Sedimentation tank 104 is connected to reaction tank 102. Sedimentation tank 104 is used to introduce metal surface treatment liquid from reaction tank 102 and realize solid-liquid separation of metal surface treatment liquid.

[0074] The first inlet 105, the second inlet 106, and the third inlet 107 are located above the reaction tank 102. The first inlet 105 is used to add hydrogen peroxide into the reaction tank 102; the second inlet 106 is used to add alkaline solution to the reaction tank 102 to adjust the pH of the metal surface treatment solution; and the third inlet 107 is used to add PAM flocculant to the reaction tank 102.

[0075] The control unit (not shown in the figure) is electrically connected to the first to third inlet ports 105-107. The control unit is used to control the operation of the first to third inlet ports 105-107 to add hydrogen peroxide, alkali solution and PAM flocculant respectively.

[0076] Preferably, the control unit is electrically connected to the stirrer 103. The control unit is used to control the stirrer 103 to perform stirring operations to ensure that the metal surface treatment solution reacts fully with the hydrogen peroxide. During the oxidation reaction, the stirrer 103 continuously stirs to improve the reaction efficiency.

[0077] It should be noted that in step S3, the solid-liquid separation of the metal surface treatment agent can be achieved through precipitation or filtration. Figure 2 In the illustrated embodiment, the sedimentation tank 104 employs sedimentation to achieve solid-liquid separation of the metal surface treatment agent. In this embodiment, the treatment and reuse device 100 uses a continuous liquid transport method between the inlet tank 101, the reaction tank 102, and the sedimentation tank 104, that is, the liquid is transported along the direction indicated by the arrow by relying on the hydraulic difference between each treatment tank.

[0078] Figure 3 A schematic diagram of a metal surface treatment liquid treatment and reuse device according to another embodiment of the present invention is shown. As shown, an intermittent liquid transport method is used between the inlet tank 101, the reaction tank 102, and the sedimentation tank 104, that is, the liquid is transported by a water pump in the direction indicated by the arrow. Specifically, the treatment and reuse device 100 further includes:

[0079] The water inlet pump 108 and the first pipeline 109 are provided. The water inlet pump 108 is installed in the water inlet tank 101. The first pipeline 109 connects the water inlet tank 101 and the reaction tank 102. The water inlet pump 108 is used to pump the metal surface treatment liquid in the water inlet tank 101 into the reaction tank 102 through the first pipeline 109.

[0080] A first water pump 110 and a second pipeline 111 are installed in the reaction tank 102. The second pipeline 111 connects the reaction tank 102 and the sedimentation tank 104. The first water pump 110 is used to pump the metal surface treatment liquid after being treated in the reaction tank 102 into the sedimentation tank 104 through the second pipeline 111.

[0081] The control unit is electrically connected to the inlet pump 108 and the first outlet pump 110, and is used to control the operation of the inlet pump 108 and the first outlet pump 110.

[0082] Better, refer to Figure 2 and Figure 3 The treatment and reuse device 100 also includes an effluent tank 112 and a fourth inlet 113. The effluent tank 112 is connected to the sedimentation tank 104 and is used to introduce the metal surface treatment solution from the reaction tank 102. The fourth inlet 113 is located substantially above the effluent tank 112 and is used to add acid to the effluent tank 112 to ensure the metal surface treatment solution meets reuse requirements.

[0083] Better, refer to Figure 3 The treatment and reuse device 100, which employs an intermittent liquid transport method, further includes:

[0084] The second water pump 114 and the third pipeline 115 are installed in the sedimentation tank 104. The third pipeline 115 connects the sedimentation tank 104 and the water outlet tank 112. The second water pump 114 is used to pump the metal surface treatment liquid after being treated in the sedimentation tank 104 into the water outlet tank 112 through the third pipeline 115.

[0085] The control unit is electrically connected to the second water pump 114, and the control unit is used to control the operation of the second water pump 114.

[0086] The following combination Figure 1 and Figure 3 The embodiments provide a detailed explanation of the method for treating and reusing the metal surface treatment liquid provided by the present invention.

[0087] Example 1

[0088] An aging surface treatment solution containing zinc and aluminum (a surface treatment solution for metals to be treated containing iron ions) from an electroplating plant is taken. The concentration of iron ions in the solution is 86.4 mg / L, zinc concentration is 1520 mg / L, aluminum concentration is 171 mg / L, and pH value is 4.2. The control unit starts the inlet pump 108, and the aging surface treatment solution is pumped from the inlet tank 101 into the reaction tank 102 through the first pipeline 109.

[0089] The control unit opens the first inlet 105 and adds 0.5 ml / L of hydrogen peroxide (30%) to the reaction tank 102. The stirrer 103 is then started to accelerate the dissolution process and ensure uniform distribution of the reactants. The reaction time is set to 30 minutes. After 30 minutes, the control unit opens the second inlet 106 and adds alkaline solution to the reaction tank 102 to adjust the pH to 5.7.

[0090] The control unit opens the third inlet 107 to add PAM flocculant to the reaction tank 102. The control unit starts the first effluent pump 110 to pump the aged surface treatment solution into the sedimentation tank 104 through the second pipeline 111. Ideally, the PAM flocculant should be added near the outlet of the reaction tank 102, which is equivalent to being close to the inlet of the first effluent pump. In the sedimentation tank 104, the solid particles adsorbed by the PAM flocculant form large clumps of coagulated material, which settle under gravity. It should be noted that the bottom of the sedimentation tank 104 is conical, allowing a large amount of coagulated material to settle to the bottom. A valve is located at the bottom of the sedimentation tank 104; opening the valve releases the coagulated material. At this point, the treated surface treatment solution contains 0.28 mg / L iron ions, 1120 mg / L zinc ions, and 148 mg / L aluminum ions.

[0091] The control unit starts the second effluent pump 114, and the surface treatment solution, after being treated in the sedimentation tank 104, is pumped into the effluent tank 112 through the third pipeline 115. The control unit opens the fourth inlet 113 to add acid solution into the effluent tank 112, and the obtained metal surface treatment solution can be sent back to the production line for use.

[0092] Example 2

[0093] An aging surface treatment solution containing zinc (a surface treatment solution for metals containing iron ions) from an electroplating plant is taken. The concentration of iron ions in the solution is 52.6 mg / L, the concentration of zinc is 1220 mg / L, and the pH value is 3.6. The control unit starts the inlet pump 108, and the aging surface treatment solution is pumped from the inlet tank 101 into the reaction tank 102 through the first pipeline 109.

[0094] The control unit opens the first inlet 105 and adds 0.25 ml / L of hydrogen peroxide (30%) to the reaction tank 102. The stirrer 103 is then started to accelerate the dissolution process and ensure uniform distribution of the reactants. The reaction time is set to 20 minutes. After the reaction is complete, the control unit opens the second inlet 106 and adds alkaline solution to the reaction tank 102 to adjust the pH to 6.0.

[0095] The control unit opens the third inlet 107 to add PAM flocculant to the reaction tank 102. The control unit starts the first effluent pump 110 to pump the aged surface treatment solution containing PAM flocculant into the sedimentation tank 104 through the second pipeline 111. In the sedimentation tank 104, the solid particles adsorbed by the PAM flocculant form large clumps of coagulated material, which settle under gravity. The valve at the bottom of the sedimentation tank 104 is opened to release the coagulated material. At this point, the iron ion concentration in the treated surface treatment solution is 0.05 mg / L, and the zinc ion concentration is 1170 mg / L.

[0096] The control unit starts the second effluent pump 114, and the surface treatment solution, after being treated in the sedimentation tank 104, is pumped into the effluent tank 112 through the third pipeline 115. The control unit opens the fourth inlet 113 to add acid solution into the effluent tank 112, and the obtained metal surface treatment solution can be sent back to the production line for use.

[0097] This invention provides a method and apparatus for treating and reusing a metal surface treatment solution, which can remove iron ions from the solution, making it reusable and extending its service life. It has the following advantages:

[0098] (1) It has a good treatment effect, while reducing the iron ion concentration, it retains the effective components of aluminum ions and / or zinc ions.

[0099] (2) The iron ion concentration after treatment is less than 1 mg / L, and the retention rates of aluminum and zinc ions are high, reaching more than 80% respectively.

[0100] (3) Hydrogen peroxide can decompose into water and oxygen in water, without introducing new substances into the treatment solution, and has little impact on the reuse of the treatment solution.

[0101] (4) The process is simple and easy to operate and implement.

[0102] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A method for treating and reusing a metal surface treatment liquid, comprising the following steps: S1, after adding hydrogen peroxide to the metal surface treatment solution and performing an oxidation reaction for a set time, adjust the pH to a set value. S2, PAM flocculant is added to the metal surface treatment liquid; S3, perform solid-liquid separation on the metal surface treatment liquid.

2. The method for treating and reusing the metal surface treatment liquid as described in claim 1, characterized in that, In step S1, hydrogen peroxide is added to the metal surface treatment solution and stirred until homogeneous. The set time is 5 to 60 minutes.

3. The method for treating and reusing the metal surface treatment liquid as described in claim 1, characterized in that, In step S1, the set value is 4 to 7.

4. The method for treating and reusing the metal surface treatment liquid as described in claim 1, characterized in that, In step S3, the metal surface treatment agent is separated into solid and liquid phases by precipitation or filtration.

5. The method for treating and reusing the metal surface treatment liquid as described in claim 1, characterized in that, It also includes step S4, which involves adding acid to the metal surface treatment solution after solid-liquid separation.

6. A device for treating and reusing a metal surface treatment liquid, applicable to the treatment and reuse method described in claim 1, wherein the device comprises: The inlet tank is used to hold the surface treatment liquid for the metal to be treated. A reaction tank, connected to the inlet tank, is equipped with a stirrer, and the reaction tank is used to introduce the metal surface treatment liquid from the inlet tank; A sedimentation tank, connected to the reaction tank, is used to introduce the metal surface treatment liquid from the reaction tank; The system includes a first inlet, a second inlet, and a third inlet. The first inlet is used to add hydrogen peroxide to the reaction tank, the second inlet is used to add alkaline solution to the reaction tank to adjust the pH of the metal surface treatment solution, and the third inlet is used to add PAM flocculant to the reaction tank. The control unit is electrically connected to the first to third dispensing ports. The control unit is used to control the operation of the first to third dispensing ports to dispense the hydrogen peroxide, alkaline solution and PAM flocculant respectively.

7. The processing and reuse device as described in claim 6, characterized in that, The control unit is electrically connected to the stirrer, and the control unit is used to control the stirrer to perform a stirring operation so that the metal surface treatment liquid reacts fully with the hydrogen peroxide.

8. The processing and reuse device as described in claim 6, characterized in that, The processing and reuse device further includes: The system includes an inlet pump and a first pipeline. The inlet pump is installed in the inlet pool, and the first pipeline connects the inlet pool and the reaction pool. The inlet pump is used to pump the metal surface treatment liquid in the inlet pool into the reaction pool through the first pipeline. A first water pump and a second pipeline are provided. The first water pump is installed in the reaction tank, and the second pipeline connects the reaction tank and the sedimentation tank. The first water pump is used to pump the metal surface treatment liquid after it has been treated in the reaction tank into the sedimentation tank through the second pipeline. The control unit is electrically connected to the inlet pump and the first outlet pump, and the control unit is used to control the operation of the inlet pump and the first outlet pump.

9. The processing and reuse device as described in claim 8, characterized in that, The processing and reuse device further includes: An effluent tank is connected to the sedimentation tank, and the effluent tank is used to introduce the metal surface treatment liquid from the reaction tank; The fourth inlet is used to add acid solution to the outlet pool.

10. The processing and reuse apparatus as described in claim 9, characterized in that, The processing and reuse device further includes: The second water pump and the third pipeline are provided. The second water pump is installed in the sedimentation tank and the third pipeline connects the sedimentation tank and the effluent tank. The second water pump is used to pump the metal surface treatment liquid after being treated in the sedimentation tank into the effluent tank through the third pipeline. The control unit is electrically connected to the second water pump, and the control unit is used to control the operation of the second water pump.

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