Wastewater treatment device for cold-rolled stainless steel annealing and pickling line

Abstract

The utility model relates to a cold-rolled stainless steel annealing and pickling line wastewater treatment device, which belongs to the technical field of wastewater treatment devices and comprises a treatment box, a treatment mechanism is arranged on the lower surface of the treatment box, a filter component is arranged on the left side of the treatment box, and the lower side of the left side of the treatment box is communicated with a first pollution discharge structure. According to the cold-rolled stainless steel annealing and pickling line wastewater treatment device, a motor, an aeration machine, a first electromagnetic valve and two electric flocculation devices can be started, no less than two stirring paddles rotate, pickling wastewater in the treatment box can be stirred, no less than two gas outlet nozzles are used for discharging oxygen, and the treatment effect is good. Iron and manganese ions in sewage are converted into high-valence oxides and hydroxides, OH ions are generated in the sewage in the power-up reaction process of the left electric flocculation device and the right electric flocculation device, the OH ions and the iron and manganese ions are combined to form insoluble substances to be separated out, electric flocculation and aeration are combined together, integrated treatment equipment is formed, and the size of the equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment devices, specifically a wastewater treatment device for a cold-rolled stainless steel annealing and pickling line. Background Technology

[0002] In the steel processing industry, hydrochloric acid is often used to clean the surface of cold-rolled stainless steel parts to remove surface oxides. During the pickling process, hydrochloric acid is continuously consumed, and the ferrous ions in the acid solution also increase until the hydrochloric acid solution no longer has a cleaning effect on the steel. The resulting wastewater is hydrochloric acid pickling wastewater. Wastewater from the cold-rolled stainless steel annealing pickling line can be treated by a wastewater treatment device and then recycled.

[0003] For example, Chinese patent CN218404415U discloses a wastewater treatment system for a cold-rolled stainless steel annealing and pickling line. The system includes a treatment tank containing interconnected filter chambers, aeration chambers, flocculation chambers, and acid addition chambers. A first spiral conveyor is rotatably mounted at the bottom of the filter chamber. An aerator is fixedly mounted at the top of the aeration chamber. An electrocoagulation device is fixedly mounted at the bottom of the flocculation chamber. A pH meter is fixedly mounted at the top of the acid addition chamber, and a sludge discharge mechanism is installed at the bottom of the sludge discharge mechanism. A reflux device is installed at the bottom of the sludge discharge mechanism. When the first spiral conveyor is activated, it discharges sludge from the sludge discharge cylinder. Oxygen is supplied by the aerator. During the electrocoagulation reaction, OH ions are generated in the wastewater, which combine with iron and manganese ions to form insoluble precipitates. These insoluble precipitates are then discharged by the sludge discharge mechanism, and the reflux device returns the water from the insoluble precipitates to the flocculation chamber, ensuring efficient wastewater recovery.

[0004] While the aforementioned patent can guarantee the recycling efficiency of pickling wastewater, the separate aeration treatment and electrocoagulation treatment of pickling wastewater in this patent will increase the size of the equipment and thus reduce its practicality. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a wastewater treatment device for cold-rolled stainless steel annealing and pickling lines. It has the advantages of combining electrocoagulation and aeration into an integrated treatment device, reducing the size of the equipment, and solving the problem that separating aeration treatment and electrocoagulation treatment of pickling wastewater would increase the size of the equipment and reduce its practicality.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a wastewater treatment device for a cold-rolled stainless steel annealing and pickling line, comprising a treatment tank, a treatment mechanism on the lower surface of the treatment tank, a filter assembly on the left side of the treatment tank, and a first sewage discharge structure connected to the lower side of the left side of the treatment tank.

[0007] The processing mechanism includes a motor mounted on the lower surface of the processing box. A rotating rod is rotatably connected to the bottom wall of the inner cavity of the processing box via a sealed bearing. The bottom end of the rotating rod rotatably passes through the processing box and is fixedly connected to the outside of the motor output shaft. At least two stirring paddles are provided on the outside of the rotating rod. A support plate is provided inside the processing box. At least two flow holes are provided through the lower surface of the support plate. A first filter screen is fixed to the upper surface of the support plate by bolts. A reflux structure is connected to the upper right side of the processing box.

[0008] The treatment mechanism also includes an aerator located on the right side of the treatment box. The aerator has a first connecting pipe fixed to its outlet end. The outer side of the first connecting pipe away from the aerator is connected to a first solenoid valve. The inside of the first solenoid valve is connected to a second connecting pipe. The lower surface of the support plate is provided with an annular air outlet pipe. The lower surface of the annular air outlet pipe is connected to at least two air outlets. The left side of the second connecting pipe passes through the treatment box and connects to the right side of the annular air outlet pipe. Electrocoagulation devices are provided on both the left and right sides of the lower surface of the support plate.

[0009] Furthermore, the reflux structure includes a first reflux pipe, a second solenoid valve is connected to the outer side of the right side of the first reflux pipe, and a second reflux pipe is connected to the inside of the second solenoid valve.

[0010] Furthermore, the filtration assembly includes a filter frame disposed on the left side of the processing tank, a second sewage discharge structure connected to the lower left side of the filter frame, a frame body disposed on the right side wall of the inner cavity of the filter frame, a filter port being provided through the left side of the frame body, a second filter screen being disposed inside the filter port, a connecting pipe being connected to the right side of the filter frame, the right side of the connecting pipe penetrating the processing tank and extending into the interior, and a liquid inlet structure being connected to the upper left side of the filter frame.

[0011] Furthermore, the first sewage discharge structure includes a first sewage discharge pipe, a first valve is connected to the outer side of the left side of the first sewage discharge pipe, and a second sewage discharge pipe is connected to the inside of the first valve.

[0012] Furthermore, the second sewage discharge structure includes a third sewage discharge pipe, with a second valve connected to the outer side of the left side of the third sewage discharge pipe, and a fourth sewage discharge pipe connected to the inside of the second valve.

[0013] Furthermore, the liquid inlet structure includes a first liquid inlet pipe, a third solenoid valve is connected to the outer side of the left side of the first liquid inlet pipe, and a second liquid inlet pipe is connected to the inside of the third solenoid valve.

[0014] Furthermore, at least two of the air outlets are evenly distributed on the lower surface of the annular air outlet pipe.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] 1. This wastewater treatment device for cold-rolled stainless steel annealing and pickling line can turn on the motor, aerator, first solenoid valve and two electrocoagulation devices, and rotate no less than two agitators to stir the pickling wastewater inside the treatment tank. No less than two air outlets can output oxygen, converting iron and manganese ions in the wastewater into high-valence oxides and hydroxides. During the electrocoagulation process, the left and right electrocoagulation devices generate OH ions in the wastewater, which combine with iron and manganese ions to form insoluble substances that precipitate out. By combining electrocoagulation and aeration, an integrated treatment device is formed, reducing the size of the equipment.

[0017] 2. The wastewater treatment device for the cold-rolled stainless steel annealing and pickling line connects the left side of the second inlet pipe to the pipe that discharges the pickling wastewater. Then, the third solenoid valve in the inlet structure is opened, and the pickling wastewater flows into the interior of the filter frame. After passing through the second filter screen to filter out large particles and impurities in the wastewater, it flows into the interior of the treatment tank through the connecting pipe. The upper side of the frame is open to facilitate the unblocking and cleaning of the clogged second filter screen and improve the flowability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the processing mechanism of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the support plate and the first filter screen of this utility model;

[0021] Figure 4 This is a schematic diagram of the filter assembly of this utility model.

[0022] In the diagram: 1. Processing box; 2. Processing mechanism; 201. Motor; 202. Rotating rod; 203. Stirring paddle; 204. Support plate; 205. Flow hole; 206. First filter screen; 207. Return structure; 208. Aerator; 209. First connecting pipe; 210. First solenoid valve; 211. Second connecting pipe; 212. Annular air outlet pipe; 213. Air outlet; 214. Electrocoagulation device; 3. Filter assembly; 301. Filter frame; 302. Second sewage discharge structure; 303. Frame; 304. Second filter screen; 305. Connecting pipe; 306. Liquid inlet structure; 4. First sewage discharge structure. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 This embodiment of a wastewater treatment device for a cold-rolled stainless steel annealing and pickling line includes a treatment tank 1. The lower surface of the treatment tank 1 is provided with a treatment mechanism 2. The treatment mechanism 2 combines electrocoagulation and aeration to form an integrated treatment device, reducing the size of the device. A filter assembly 3 is provided on the left side of the treatment tank 1. The filter assembly 3 is used to unclog and clean the blocked second filter screen 304, improving the flowability. The lower left side of the treatment tank 1 is connected to a first sewage discharge structure 4.

[0025] In this embodiment, the first sewage discharge structure 4 includes a first sewage discharge pipe, a first valve is connected to the outer side of the left side of the first sewage discharge pipe, and a second sewage discharge pipe is connected to the inside of the first valve.

[0026] Please see Figures 2 to 3 In order to combine electrocoagulation and aeration to form an integrated treatment device and reduce the size of the device, in this embodiment, the treatment mechanism 2 includes a motor 201 disposed on the lower surface of the treatment box 1. The bottom wall of the inner cavity of the treatment box 1 is rotatably connected to a rotating rod 202 through a sealed bearing. The bottom end of the rotating rod 202 rotatably passes through the treatment box 1 and is fixedly connected to the outside of the output shaft of the motor 201. At least two stirring paddles 203 are disposed on the outside of the rotating rod 202. A support plate 204 is disposed inside the treatment box 1. At least two flow holes 205 are opened through the lower surface of the support plate 204. A first filter screen 206 is fixed to the upper surface of the support plate 204 by bolts. A return structure 207 is connected to the upper right side of the treatment box 1.

[0027] In this embodiment, in the steel processing industry, hydrochloric acid is often used to clean the surface of cold-rolled stainless steel parts to remove surface oxides. During the pickling process, hydrochloric acid is continuously consumed, and the ferrous ions in the acid solution also increase continuously until the hydrochloric acid solution no longer has a cleaning effect on the steel and needs to be treated.

[0028] In this embodiment, the treatment mechanism 2 also includes an aerator 208 located on the right side of the treatment tank 1. A first connecting pipe 209 is fixed to the air outlet end of the aerator 208. A first solenoid valve 210 is connected to the outer side of the end of the first connecting pipe 209 away from the aerator 208. A second connecting pipe 211 is connected to the inside of the first solenoid valve 210. An annular air outlet pipe 212 is provided on the lower surface of the support plate 204. At least two air outlets 213 are connected to the lower surface of the annular air outlet pipe 212. The motor 201, aerator 208, first solenoid valve 210 and two electrocoagulation devices 214 can be turned on, and at least two stirring paddles 203 can be rotated to agitate the acid washing wastewater inside the treatment tank 1. At least two air outlets 213 can release oxygen to convert iron and manganese ions in the wastewater into high-valence oxides and hydroxides.

[0029] In this embodiment, the left side of the second connecting pipe 211 passes through the treatment box 1 and is connected to the right side of the annular air outlet pipe 212. Electrocoagulation devices 214 are provided on both the left and right sides of the lower surface of the support plate 204. The reflux structure 207 includes a first reflux pipe. A second solenoid valve is connected to the outer side of the right side of the first reflux pipe. The second reflux pipe is connected to the inside of the second solenoid valve. At least two air outlets 213 are evenly distributed on the lower surface of the annular air outlet pipe 212.

[0030] It should be noted that during the electrocoagulation process, the left and right electrocoagulation devices 214 generate OH ions in the wastewater, which combine with iron and manganese ions to form insoluble substances that precipitate out. Hydrochloric acid can be added to the treatment tank 1 to ensure that the pH value of the acid water remains normal. Afterwards, the treated pickling wastewater is returned by opening the second solenoid valve in the reflux structure 207 for subsequent pickling work.

[0031] Please see Figure 4 In order to facilitate the unblocking and cleaning of the clogged second filter screen 304 and improve the flowability, in this embodiment, the filter assembly 3 includes a filter frame 301 disposed on the left side of the processing box 1. The lower left side of the filter frame 301 is connected to a second sewage discharge structure 302. A frame body 303 is disposed on the right side wall of the inner cavity of the filter frame 301. A filter port is provided through the left side of the frame body 303. The second filter screen 304 is disposed inside the filter port. A connecting pipe 305 is connected to the right side of the filter frame 301. The right side of the connecting pipe 305 passes through the processing box 1 and extends into the interior. A liquid inlet structure 306 is connected to the upper left side of the filter frame 301.

[0032] In this embodiment, the liquid inlet structure 306 includes a first liquid inlet pipe, a third solenoid valve is connected to the outer side of the left side of the first liquid inlet pipe, and a second liquid inlet pipe is connected to the inside of the third solenoid valve. The second sewage discharge structure 302 includes a third sewage discharge pipe, a second valve is connected to the outer side of the left side of the third sewage discharge pipe, and a fourth sewage discharge pipe is connected to the inside of the second valve.

[0033] It should be noted that the left side of the second inlet pipe is connected to the pipe for discharging pickling wastewater. Then, the third solenoid valve in the inlet structure 306 is opened, and the pickling wastewater flows into the interior of the filter frame 301. After passing through the second filter screen 304 to filter out large particles of impurities in the wastewater, it flows into the interior of the treatment tank 1 through the connecting pipe 305. The upper side of the frame 303 is open to facilitate the unblocking and cleaning of the clogged second filter screen 304. The third solenoid valve can be closed. Then, the impurities remaining inside the filter frame 301 can be discharged by opening the second valve in the first sewage discharge structure 4.

[0034] The working principle of the above embodiments is as follows:

[0035] (1) Connect the left side of the second inlet pipe to the pipe for discharging pickling wastewater. Then, open the third solenoid valve in the inlet structure 306. The pickling wastewater flows into the filter frame 301 and then passes through the second filter screen 304 to filter out large particles of impurities. After that, it flows into the treatment tank 1 through the connecting pipe 305. The upper side of the frame 303 is open so that the blocked second filter screen 304 can be cleared. The third solenoid valve can be closed. Then, the impurities inside the filter frame 301 can be discharged by opening the second valve in the first sewage discharge structure 4.

[0036] (2) The motor 201, aerator 208, first solenoid valve 210 and two electrocoagulation devices 214 can be turned on, and no less than two stirring paddles 203 can be rotated to stir the pickling wastewater inside the treatment tank 1. No less than two air outlets 213 can release oxygen to convert iron and manganese ions in the wastewater into high-valence oxides and hydroxides. During the electrocoagulation reaction, the left and right electrocoagulation devices 214 generate OH ions in the wastewater, which combine with iron and manganese ions to form insoluble substances that precipitate out. Hydrochloric acid can be added to the treatment tank 1 to ensure that the pH value of the acid water remains normal. After that, the treated pickling wastewater can be returned by opening the second solenoid valve in the return structure 207 for subsequent pickling work.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 said element.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A cold-rolled stainless steel annealing pickling line wastewater treatment device comprising a treatment tank (1), characterized in that: The lower surface of the processing box (1) is provided with a processing mechanism (2), the left side of the processing box (1) is provided with a filtering assembly (3), and the lower side of the left side of the processing box (1) is communicated with a first blowdown structure (4); The processing mechanism (2) comprises a motor (201) arranged on the lower surface of the processing box (1), a rotating rod (202) rotatably connected to the bottom wall of the inner cavity of the processing box (1) through a sealing bearing, the bottom end of the rotating rod (202) rotatably penetrates the processing box (1) and is fixedly connected to the outer side of the output shaft of the motor (201), the outer side of the rotating rod (202) is provided with a plurality of stirring paddles (203), the inside of the processing box (1) is provided with a supporting plate (204), a plurality of flow-through holes (205) are formed in the lower surface of the supporting plate (204), a first filter screen (206) is fixedly arranged on the upper surface of the supporting plate (204) through bolts, and the upper side of the right side of the processing box (1) is communicated with a backflow structure (207). The processing mechanism (2) further comprises an aerator (208) arranged on the right side of the processing box (1), a first connecting pipe (209) is fixedly arranged on the air outlet end of the aerator (208), a first electromagnetic valve (210) is communicated with the outer side of the end of the first connecting pipe (209) away from the aerator (208), a second connecting pipe (211) is communicated in the first electromagnetic valve (210), an annular air outlet pipe (212) is arranged on the lower surface of the supporting plate (204), a plurality of air outlet nozzles (213) are communicated with the lower surface of the annular air outlet pipe (212), the left side of the second connecting pipe (211) penetrates the processing box (1) and is communicated with the right side of the annular air outlet pipe (212), and electric flocculation devices (214) are arranged on the left and right sides of the lower surface of the supporting plate (204).

2. The cold rolled stainless steel annealing and pickling line wastewater treatment plant as claimed in claim 1 wherein: The backflow structure (207) comprises a first backflow pipe, a second electromagnetic valve is communicated with the outer side of the right side of the first backflow pipe, and a second backflow pipe is communicated in the second electromagnetic valve.

3. The apparatus for treating wastewater from an annealing and pickling line for cold-rolled stainless steel according to claim 1, characterized in that: The filtering assembly (3) comprises a filtering frame (301) arranged on the left side of the processing box (1), a second blowdown structure (302) is communicated with the lower side of the left side of the filtering frame (301), a frame body (303) is arranged on the right side wall in the inner cavity of the filtering frame (301), a filtering opening is formed in the left side of the frame body (303), a second filter screen (304) is arranged in the filtering opening, a communication pipe (305) is communicated with the right side of the filtering frame (301), the right side of the communication pipe (305) penetrates the processing box (1) and extends into the inner cavity, and a liquid inlet structure (306) is communicated with the upper side of the left side of the filtering frame (301).

4. The apparatus for treating wastewater from an annealing and pickling line for cold-rolled stainless steel according to claim 1, characterized in that: The first blowdown structure (4) comprises a first blowdown pipe, a first valve is communicated with the outer side of the left side of the first blowdown pipe, and a second blowdown pipe is communicated in the first valve.

5. The apparatus for treating wastewater from an annealing and pickling line for cold-rolled stainless steel according to claim 3, characterized in that: The second blowdown structure (302) comprises a third blowdown pipe, a second valve is communicated with the outer side of the left side of the third blowdown pipe, and a fourth blowdown pipe is communicated in the second valve.

6. The apparatus for treating wastewater from an annealing and pickling line for cold-rolled stainless steel according to claim 3, characterized in that: The liquid inlet structure (306) comprises a first liquid inlet pipe, an outer side of a left side of the first liquid inlet pipe is communicated with a third electromagnetic valve, and an inner side of the third electromagnetic valve is communicated with a second liquid inlet pipe.

7. The apparatus for treating wastewater from an annealing and pickling line for cold-rolled stainless steel according to claim 1, characterized in that: The plurality of gas outlet nozzles (213) are uniformly distributed on the lower surface of the annular gas outlet pipe (212).

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