A dosing device for steel plant wastewater recovery

Abstract

The utility model belongs to wastewater recovery technical field especially relates to a dosing device for steel plant wastewater recovery, including preprocessing box, the right side of preprocessing box is fixed with collection tank, and the left side of preprocessing box is provided with flocculation tank, through setting guide mechanism, utilize the guide plate to carry out the speed reduction guidance to wastewater, again through horizontal board no.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater recycling technology, and in particular relates to a dosing device for wastewater recycling in steel plants. Background Technology

[0002] As a high water-consuming industry, the steel industry generates wastewater with complex composition and high pollutant concentrations, encompassing suspended solids (SS), oils, heavy metals, organic matter, cyanides, phenols, and high salinity. For example, the SS concentration in blast furnace gas washing wastewater can reach 1000-3000 mg / L, containing trace amounts of toxic substances such as phenols, cyanides, and zinc; the SS concentration in converter dust removal wastewater in steelmaking is as high as 10 g / L or more, mainly composed of iron oxide and calcium oxide; cold rolling wastewater involves complex pollutants such as acids, alkalis, emulsions, and chromium ions. If this wastewater is discharged directly without effective treatment, it will lead to eutrophication of water bodies, accumulation of heavy metals, and damage to ecosystems. At the same time, high-salinity wastewater easily causes pipe scaling and corrosion, exacerbating the difficulty of reuse.

[0003] Existing wastewater treatment processes typically employ multi-stage combined processes, including sedimentation, oxidation reactions, membrane filtration, and reverse osmosis. Among these, chemical dosing is a key step, used for neutralizing acids and alkalis, demulsifying and removing oil, flocculating and settling, and inhibiting scale.

[0004] For example, Chinese patent CN216472567U discloses a wastewater recycling and cleaning device, including a filter chamber with an opening at the upper right end. A partition is fixedly installed on the lower wall of the opening. A filtration mechanism is provided at the upper part of the filter chamber. A ramp is fixedly installed on the upper right side of the partition. A water outlet pipe and a sewage drain pipe are installed sequentially from top to bottom at the left end of the filter chamber. The water outlet pipe is located below the partition. A waste bin is fixedly installed at the right end of the filter chamber. A dosing bin is fixedly installed at the left end of the water outlet pipe. A dosing mechanism is provided at the upper end of the dosing bin. A clean water pipe is installed at the lower left end of the dosing bin. This wastewater recycling and cleaning device achieves circulating filtration through a filtration mechanism and has an automatic waste cleaning function, extending the service life of the filter screen. By collecting the upper wastewater in the filter chamber into the dosing bin through the water outlet pipe, the amount of solid waste entering the dosing bin from the wastewater is reduced at the source, improving the effectiveness of the chemicals.

[0005] This patent has several drawbacks in its use, such as: First, although the device filters the wastewater before adding chemicals to reduce the adverse effects of solid impurities on the dosing process, in practice, some solid impurities may be missed due to insufficient filtration. Because of the height difference, the upper layer of filtered wastewater in the filter chamber is constantly impacted by the downward-flowing wastewater, preventing sufficient and effective sedimentation. This results in solid impurities of a certain size still floating on the upper side of the filter chamber, which then enters the dosing chamber through the outlet pipe, thus affecting the flocculation effect of the chemicals on the wastewater. Second, the device only uses spraying to add chemicals to the wastewater, preventing sufficient mixing between the lower layer of wastewater and the chemicals. This reduces the actual effectiveness of the chemicals and results in poor overall wastewater treatment. Therefore, we propose a dosing device for wastewater recovery in steel plants. Utility Model Content

[0006] The purpose of this invention is to provide a dosing device for wastewater recovery in steel plants, so as to solve the problems mentioned in the background art.

[0007] In view of this, the present invention provides a dosing device for wastewater recovery in steel plants, comprising: A pretreatment tank is provided, with a collection tank fixed on the right side and a flocculation tank on the left side. A filter assembly for filtering large particulate impurities in wastewater is provided in the upper part of the inner cavity of the pretreatment tank. A guide mechanism for guiding wastewater is provided in the inner cavity of the pretreatment tank and directly below the filter assembly. A connecting pipe is fixedly installed between the pretreatment tank and the flocculation tank. A drain pipe is fixedly installed on the front side wall of the pretreatment tank near the lower edge. A water injection hopper is fixed on the top of the pretreatment tank near the left edge. A stirring mechanism is provided, which is located in the middle of the inner cavity of the flocculation box and is used to mix and stir the wastewater in the flocculation box. Two sets of dosing components are symmetrically arranged on both sides of the stirring mechanism and are used to add chemical agents into the inner cavity of the flocculation box.

[0008] In the above technical solution, the filtering component further includes: A rotating rod is rotatably mounted on the upper part of the inner cavity of the pretreatment box. Three fixed frames are fixedly mounted on the rotating rod at equal intervals around the circumference. Filter screens are snapped onto the fixed frames. A motor is fixedly mounted on the outer wall of the pretreatment box, and the output shaft of the motor passes through the pretreatment box and is coaxially connected to the rotating rod.

[0009] In the above technical solution, a discharge port is further provided on the right side wall of the pretreatment box and on the left edge near the top opening of the collection box, and a guide plate is fixedly installed in the inner cavity of the pretreatment box near the discharge port.

[0010] In the above technical solution, the guiding mechanism further includes: The guide plate has a W-shaped structure and is fixedly installed inside the pretreatment tank. The guide plate is located directly below the rotating rod. A vertical plate is fixed to the bottom of the guide plate, and the two sides of the vertical plate are fixed to the inner wall of the pretreatment tank. A horizontal plate is fixed to the inner wall of the pretreatment tank at the bottom left side of the vertical plate. The horizontal plate is perpendicular to the vertical plate. A second horizontal plate is fixed to the inner wall of the pretreatment tank at the position between the first horizontal plate and the guide plate. The first and second horizontal plates are arranged in parallel and staggered. The inlet end of the connecting pipe is located between the second horizontal plate and the guide plate. The drain pipe is located below the first horizontal plate.

[0011] In the above technical solution, the dosing assembly further includes: A reagent tank is fixedly installed on the outer wall of a flocculation box. A water pump is fixedly installed inside the reagent tank. A water pipe is fixedly installed inside the flocculation box, and multiple evenly distributed nozzles are fixedly installed on the water pipe. One end of the water pipe passes through the inner wall of the flocculation box and extends into the reagent tank to connect with the water pump.

[0012] In the above technical solution, the stirring mechanism further includes: A support plate is fixedly installed at the center of the top opening of the flocculation box. A support frame one is fixed at the center of the upper surface of the support plate. Support frames two, fixed to the support plate, are symmetrically arranged on both sides of support frame one. A drive rod is rotatably mounted on the lower surface of support frame one, with its bottom end penetrating the support plate and extending into the inner cavity of the flocculation box. Two drive wheels are fixedly installed on the upper part of the support plate. A bearing seat is fixedly mounted on the lower surface of support frame two, and a driven rod is coaxially connected to the bearing seat, with its bottom end penetrating the support plate and extending into the flocculation box. Inside the cavity, a driven wheel is fixedly installed on the driven rod at the upper part of the support plate. The driven wheels on the two driven rods correspond one-to-one with the two driven wheels on the driving rod. A belt is provided between the driving wheel and the corresponding driven wheel, and the driving wheel and the corresponding driven wheel are driven by the belt. Multiple evenly distributed stirring blades are fixedly installed on the driven rod at the position inside the flocculation box cavity. A spiral blade is fixedly installed on the driving rod at the position inside the flocculation box cavity. A motor is fixedly installed on the upper surface of the support frame one, and the output shaft of the motor two passes through the support frame one and is coaxially connected to the driving rod.

[0013] In the above technical solution, a discharge pipe is further fixed on the right side wall of the flocculation box near the bottom.

[0014] The beneficial effects of this utility model are: 1. This dosing device for steel plant wastewater recycling uses a guiding mechanism to slow down and guide the wastewater through a guide plate. Then, horizontal plates one and two block the settling impurities in the wastewater, ensuring that the content of settling impurities in the wastewater entering the upper part of horizontal plate two is low, thereby improving the flocculation efficiency and flocculation effect of the wastewater in the flocculation tank during the flocculation stage.

[0015] 2. This dosing device for steel plant wastewater recycling uses a stirring mechanism to mix the wastewater and chemicals in the flocculation tank cavity with two driven rods and multiple stirring blades on the driven rods. The spiral blades churn the mixed solution in the middle of the flocculation tank cavity, which greatly increases the effective contact area between the chemicals and wastewater, improves the flocculation efficiency of the chemicals on the wastewater, and enhances the wastewater treatment effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the collection box in this utility model; Figure 3 This is a cross-sectional schematic diagram of the flocculation box in this utility model; Figure 4 This is a schematic diagram of the stirring mechanism in this utility model.

[0017] The markings in the diagram are as follows: 1. Pretreatment box; 2. Collection box; 3. Flocculation box; 4. Rotating rod; 5. Fixing frame; 6. Filter screen; 7. Motor 1; 8. Discharge port; 9. Guide plate; 10. Guide plate; 11. Vertical plate; 12. Horizontal plate 1; 13. Horizontal plate 2; 14. Connecting pipe; 15. Sewage pipe; 16. Water injection hopper; 17. Support plate; 18. Chemical tank; 19. Water pipe; 20. Nozzle; 21. Support frame 1; 22. Support frame 2; 23. Driving rod; 24. Driving wheel; 25. Bearing seat; 26. Driven rod; 27. Driven wheel; 28. Belt; 29. ​​Stirring blade; 30. Spiral blade; 31. Motor 2; 32. Discharge pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] In the description of this application, 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. 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, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0020] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character "" generally indicates that the preceding and following objects have an "or" relationship.

[0021] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0022] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples. Example 1

[0023] Please see Figure 1 - Figure 4 As shown, this embodiment provides a dosing device for steel plant wastewater recovery, comprising: A pretreatment box 1 is provided. A collection box 2 is fixed on the right side of the pretreatment box 1. A flocculation box 3 is provided on the left side of the pretreatment box 1. A filter assembly for filtering large particulate impurities in wastewater is provided in the upper part of the inner cavity of the pretreatment box 1. A guide mechanism for guiding wastewater is provided in the inner cavity of the pretreatment box 1 and directly below the filter mechanism. A connecting pipe 14 is fixedly installed between the pretreatment box 1 and the flocculation box 3. A drain pipe 15 is fixedly installed on the front side wall of the pretreatment box 1 near the lower edge. A water injection hopper 16 is fixed on the top of the pretreatment box 1 near the left edge. A stirring mechanism is located in the middle of the inner cavity of the flocculation box 3 and is used to mix and stir the wastewater in the flocculation box 3. Two sets of dosing components are symmetrically arranged on both sides of the stirring mechanism and are used to add chemical agents into the inner cavity of the flocculation box 3.

[0024] Wastewater enters the inner cavity of the pretreatment tank 1 through the water inlet 16 and is filtered by the filter assembly. Large particles of impurities settle on the upper surface of the filter screen 6. The wastewater then flows downwards to the bottom of the pretreatment tank 1 under the action of the guide mechanism, and gradually converges to the bottom of the pretreatment tank 1 under the action of the vertical plate 11 and the first horizontal plate 12. The second horizontal plate 13 obstructs the flow of newly falling wastewater into the inner cavity of the pretreatment tank 1, preventing impurities settled at the bottom from being agitated and suspended due to impact during the fall. Ensure that the wastewater at the inlet of connecting pipe 14 contains few impurities and suspended solids. Then, the wastewater enters the inner cavity of flocculation tank 3. Start the dosing component to add flocculants, coagulants, and other chemicals into the inner cavity of flocculation tank 3. Then, start the stirring mechanism again to ensure that the chemicals fully contact and react with the wastewater, thereby accelerating the flocculation speed and improving the wastewater treatment efficiency. A slag discharge port is provided on one side of collection tank 2. When it is necessary to remove slag from the inner cavity of collection tank 2, large particulate impurities can be centrally treated through the slag discharge port. Example 2

[0025] This embodiment provides a dosing device for steel plant wastewater recovery. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the filter assembly includes: Rotating rod 4 is rotatably installed on the upper part of the inner cavity of pretreatment box 1. Three fixed frames 5 are fixedly installed on rotating rod 4 at equal intervals around the circumference. Filter screens 6 are snapped onto fixed frames 5. Motor 7 is fixedly installed on the outer wall of pretreatment box 1, and the output shaft of motor 7 passes through pretreatment box 1 and is coaxially connected to rotating rod 4.

[0026] The included angle between the three fixed frames 5 is 120°. In the initial state, the leftmost fixed frame 5 is horizontally positioned and located directly below the water injection hopper 16, ensuring that the wastewater falling from the water injection hopper 16 can be completely filtered by the filter screen 6 on the fixed frame 5. When it is necessary to remove impurities from the fixed frame 5, the motor 7 is started. The output shaft of the motor 7 rotates and drives the rotating rod 4 to rotate clockwise. At this time, large particles of impurities on the fixed frame 5 gradually enter the right side from the left side of the pretreatment box 1 cavity and gradually slide off the filter screen 6 under the action of gravity. Guided by the guide plate 9, they fall from the discharge port 8 into the cavity of the collection box 2. (Refer to the attached instruction manual for details.) Figure 2 It is worth noting that the gap between the edge of the fixing frame 5 on the left and the inner wall of the pretreatment box 1 is small, and they are almost touching. The edge of the fixing frame 5 can be rounded, as not shown in the attached drawings of this application. The fixing frame 5 will not rub against the inner wall of the pretreatment box 1 when it rotates. This is hereby declared.

[0027] By setting up a filtration system, large particulate impurities in wastewater can be effectively filtered out, reducing the impact of large particulate impurities on the flocculation stage in subsequent processes. Example 3

[0028] This embodiment provides a dosing device for steel plant wastewater recycling. In addition to the technical solution of the above embodiment, it also has the following technical features: a discharge port 8 is provided on the right side wall of the pretreatment tank 1 and on the left edge near the top opening of the collection tank 2; a guide plate 9 is fixedly installed in the inner cavity of the pretreatment tank 1 near the discharge port 8.

[0029] The upper edge of the guide plate 9 is flush with the bottom edge of one of the fixed frames 5.

[0030] By setting the guide plate 9, large particles of impurities falling from the filter screen 6 can be guided, so that the large particles of impurities can smoothly slide into the inner cavity of the collection box 2. Example 4

[0031] This embodiment provides a dosing device for steel plant wastewater recovery. In addition to the technical solutions described in the above embodiments, it also has the following technical features, including a guiding mechanism: The guide plate 10 has a W-shaped structure and is fixedly installed in the inner cavity of the pretreatment tank 1. The guide plate 10 is located directly below the rotating rod 4. A vertical plate 11 is fixed to the bottom of the guide plate 10, and the two sides of the vertical plate 11 are fixed to the inner wall of the pretreatment tank 1. A horizontal plate 12 fixed to the inner wall of the pretreatment tank 1 is provided at the bottom left of the vertical plate 11. The horizontal plate 12 is perpendicular to the vertical plate 11. A horizontal plate 13 fixed to the inner wall of the pretreatment tank 1 is provided between the horizontal plate 12 and the guide plate 10. The horizontal plate 12 and the horizontal plate 13 are arranged in parallel and staggered. The inlet end of the connecting pipe 14 is located between the horizontal plate 13 and the guide plate 10. The drain pipe 15 is located below the horizontal plate 12.

[0032] The reference manual is attached. Figure 2 The diagram shows the distribution structure of guide plate 10, vertical plate 11, horizontal plate 12 and horizontal plate 2 13. When wastewater falls from the filter screen 6, it slides down the upper inclined surface of guide plate 10 in sequence and gradually slows down under the action of the inclined surface with a multi-level decreasing slope. Finally, it falls into the bottom of the inner cavity of pretreatment tank 1 at the gap between vertical plate 11 and the inner wall of the right side of pretreatment tank 1. When the wastewater flows into the bottom of pretreatment tank 1, the suspended solids generated can be separated and blocked by horizontal plate 12 and horizontal plate 2 13 in sequence, reducing the height of the suspended solids floating, thereby ensuring that the content of settleable impurities in the wastewater that finally enters above horizontal plate 2 13 is low.

[0033] By setting up a guiding mechanism, the wastewater is slowed down and guided by the guide plate 10. Then, the sedimentable impurities in the wastewater are blocked by the first horizontal plate 12 and the second horizontal plate 13, ensuring that the content of sedimentable impurities in the wastewater that finally enters the second horizontal plate 13 is low, thereby improving the flocculation efficiency and flocculation effect of the wastewater in the flocculation box 3 during the flocculation stage. Example 5

[0034] This embodiment provides a dosing device for steel plant wastewater recovery. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the dosing components include: A reagent tank 18 is fixedly installed on the outer wall of the flocculation box 3. A water pump is fixedly installed inside the reagent tank 18. A water pipe 19 is fixedly installed inside the flocculation box 3, and multiple evenly distributed nozzles 20 are fixedly installed on the water pipe 19. One end of the water pipe 19 passes through the inner wall of the flocculation box 3 and extends into the reagent tank 18 to connect with the water pump.

[0035] When the wastewater enters the flocculation tank 3, the water pumps in the two reagent tanks 18 are started. The two reagent tanks 18 are respectively filled with coagulant and polymeric flocculant. The water pumps can deliver the coagulant and polymeric flocculant to the corresponding water pipes 19, and spray them out by multiple nozzles 20. The reagents enter the inner cavity of the flocculation tank 3 through the nozzles 20 and come into contact with the wastewater.

[0036] By setting up a dosing assembly and spraying through multiple nozzles 20, the contact area between the agent and the wastewater is increased, and the agent can be sprayed more evenly. Example 6

[0037] This embodiment provides a dosing device for steel plant wastewater recovery. In addition to the technical solutions described in the above embodiments, it also has the following technical features: the stirring mechanism includes: A support plate 17 is fixedly installed at the center of the top opening of the flocculation box 3. A support frame 21 is fixed at the center of the upper surface of the support plate 17. Support frames 22, which are fixed to the support plate 17, are symmetrically arranged on both sides of the support frame 21. An active rod 23 is rotatably installed on the lower surface of the support frame 21, and the bottom end of the active rod 23 passes through the support plate 17 and extends into the inner cavity of the flocculation box 3. Two active wheels 24 are fixedly installed on the upper part of the active rod 23. A bearing seat 25 is fixedly installed on the lower surface of the support frame 22. A driven rod 26 is coaxially connected to the bearing seat 25, and the bottom end of the driven rod 26 passes through the support plate 17 and extends into the inner cavity of the flocculation box 3. A driven wheel 27 is fixedly installed on the upper part of the support plate 17 on the driven rod 26. The driven wheels 27 on the two driven rods 26 correspond one-to-one with the two driving wheels 24 on the driving rod 23. A belt 28 is provided between the driving wheel 24 and the corresponding driven wheel 27. The driving wheel 24 and the corresponding driven wheel 27 are driven by the belt 28. Multiple uniformly distributed stirring blades 29 are fixedly installed on the driven rod 26 in the inner cavity of the flocculation box 3. A spiral blade 30 is fixedly installed on the driving rod 23 in the inner cavity of the flocculation box 3. A motor 31 is fixedly installed on the upper surface of the support frame 21. The output shaft of the motor 31 passes through the support frame 21 and is coaxially connected to the driving rod 23.

[0038] After the reagent is added, motor 21 is started. At this time, the output shaft of motor 21 rotates, which drives the drive rod 23 to rotate. The two drive wheels 24 on the drive rod 23 rotate accordingly. The two drive wheels 24 drive the driven wheels 27 on both sides to rotate through the corresponding belts 28. The driven wheels 27 drive the driven rod 26 to rotate. At this time, the multiple stirring blades 29 located in the inner cavity of the flocculation box 3 stir and mix the wastewater on both sides of the flocculation box 3, thereby accelerating the contact between the reagent and the wastewater and improving the flocculation efficiency of suspended solids and impurities in the wastewater. Meanwhile, the spiral blades 30, while rotating with the drive rod 23, can churn the wastewater in the middle of the inner cavity of the flocculation box 3 upward, thereby further improving the mixing efficiency of wastewater and reagent.

[0039] By setting up a stirring mechanism, the wastewater and reagents in the inner cavity of the flocculation box 3 are mixed and stirred by two driven rods 26 and multiple stirring blades 29 on the driven rods 26. The mixed solution in the middle of the inner cavity of the flocculation box 3 is churned by the spiral blades 30, which greatly increases the effective contact area between the reagents and the wastewater, improves the flocculation efficiency of the reagents on the wastewater, and increases the treatment effect of the wastewater. Example 7

[0040] This embodiment provides a dosing device for steel plant wastewater recycling. In addition to the technical solutions of the above embodiments, it also has the following technical features: a discharge pipe 32 is fixed on the right side wall of the flocculation tank 3 near the bottom.

[0041] The treated wastewater is discharged to subsequent processes through discharge pipe 32.

[0042] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A dosing device for wastewater recovery in steel plants, characterized in that, include: A pretreatment box (1) is provided with a collection box (2) fixed on the right side of the pretreatment box (1) and a flocculation box (3) on the left side of the pretreatment box (1). A filter assembly for filtering large particulate impurities in wastewater is provided in the upper part of the inner cavity of the pretreatment box (1). A guide mechanism for guiding wastewater is provided in the inner cavity of the pretreatment box (1) and directly below the filter mechanism. A connecting pipe (14) is fixedly installed between the pretreatment box (1) and the flocculation box (3). A drain pipe (15) is fixedly installed on the front side wall of the pretreatment box (1) near the lower edge. A water injection hopper (16) is fixed on the top of the pretreatment box (1) near the left edge. A stirring mechanism is provided in the middle of the inner cavity of the flocculation box (3) and is used to mix and stir the wastewater in the flocculation box (3). Two sets of dosing components are symmetrically arranged on both sides of the stirring mechanism and are used to add chemical agents into the inner cavity of the flocculation box (3).

2. The dosing device for steel plant wastewater recovery according to claim 1, characterized in that, The filtering component includes: Rotating rod (4) is rotatably installed on the upper part of the inner cavity of the pretreatment box (1). Three fixed frames (5) are fixedly installed on the rotating rod (4) and are evenly distributed in a circle. A filter screen (6) is snapped onto the fixed frame (5). A motor (7) is fixedly installed on the outer wall of the pretreatment box (1), and the output shaft of the motor (7) passes through the pretreatment box (1) and is coaxially connected with the rotating rod (4).

3. A dosing device for steel plant wastewater recovery according to claim 2, characterized in that, The pretreatment box (1) has a discharge port (8) on the right side wall and near the left edge of the top opening of the collection box (2). A guide plate (9) is fixedly installed in the inner cavity of the pretreatment box (1) near the discharge port (8).

4. A dosing device for steel plant wastewater recovery according to claim 3, characterized in that, The guiding mechanism includes: A guide plate (10) is W-shaped and is fixedly installed in the inner cavity of the pretreatment box (1). The guide plate (10) is located directly below the rotating rod (4). A vertical plate (11) is fixed to the bottom of the guide plate (10), and the two sides of the vertical plate (11) are fixed to the inner wall of the pretreatment box (1). A horizontal plate (11) is provided at the bottom left side of the vertical plate (11) and is fixed to the inner wall of the pretreatment box (1). 2) The first horizontal plate (12) is set vertically to the first vertical plate (11). The second horizontal plate (13) is fixed to the inner wall of the pretreatment box (1) at the position between the first horizontal plate (12) and the guide plate (10). The first horizontal plate (12) and the second horizontal plate (13) are set in parallel and staggered. The inlet end of the connecting pipe (14) is located between the second horizontal plate (13) and the guide plate (10). The drain pipe (15) is located below the first horizontal plate (12).

5. A dosing device for steel plant wastewater recovery according to claim 1, characterized in that, The dosing assembly includes: A reagent tank (18) is fixedly installed on the outer wall of the flocculation box (3). A water pump is fixedly installed inside the reagent tank (18). A water pipe (19) is fixedly installed in the inner cavity of the flocculation box (3), and multiple evenly distributed nozzles (20) are fixedly installed on the water pipe (19). One end of the water pipe (19) penetrates the inner wall of the flocculation box (3) and extends into the reagent tank (18) to communicate with the water pump.

6. A dosing device for steel plant wastewater recovery according to claim 1, characterized in that, The stirring mechanism includes: A support plate (17) is fixedly installed at the center of the top opening of the flocculation box (3). A support frame (21) is fixed at the center of the upper surface of the support plate (17). Support frames (22) are symmetrically arranged on both sides of the support frame (21) and fixed to the support plate (17). An active rod (23) is rotatably installed on the lower surface of the support frame (21). The bottom end of the active rod (23) passes through the support plate (17) and extends into the inner cavity of the flocculation box (3). Two active wheels (24) are fixedly installed on the upper part of the support plate (17) of the active rod (23). A bearing seat (25) is fixedly installed on the lower surface of the support frame (22). A driven rod (26) is coaxially connected to the bearing seat (25). The bottom end of the driven rod (26) passes through the support plate (17) and extends into the inner cavity of the flocculation box (3). The driven rod (26) is fixedly installed with a driven wheel (27) at the upper position of the support plate (17). The driven wheels (27) on the two driven rods (26) correspond one-to-one with the two driving wheels (24) on the driving rod (23). A belt (28) is provided between the driving wheel (24) and the corresponding driven wheel (27). The driving wheel (24) and the corresponding driven wheel (27) are driven by the belt (28). The driven rod (26) is fixedly installed with a plurality of uniformly distributed stirring blades (29) at the position of the inner cavity of the flocculation box (3). The driving rod (23) is fixedly installed with a spiral blade (30) at the position of the inner cavity of the flocculation box (3). The upper surface of the support frame (21) is fixedly installed with a motor (31), and the output shaft of the motor (31) passes through the support frame (21) and is coaxially connected with the driving rod (23).

7. A dosing device for steel plant wastewater recovery according to claim 1, characterized in that, A discharge pipe (32) is fixed on the right side wall of the flocculation box (3) near the bottom.

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