A stainless steel production pickling wastewater treatment system and its treatment process

Abstract

This invention discloses a stainless steel production pickling wastewater treatment system and its treatment process. The system includes a filter chamber, a neutralization mechanism, a coagulation mechanism, and an activated carbon adsorption mechanism arranged sequentially. The filter chamber performs preliminary filtration of the pickling wastewater, followed by acid-base neutralization in the neutralization mechanism, then flocculation and sedimentation in the coagulation mechanism, and finally, the wastewater is discharged while the sludge is dewatered and transferred. The specific process steps include: 1) preliminary filtration in the filter chamber; 2) neutralization treatment in the neutralization mechanism; 3) flocculation treatment in the coagulation mechanism; 4) activated carbon adsorption treatment; and 5) post-treatment of wastewater and sludge. This invention can effectively remove impurities from the wastewater through filtration in the filter chamber and promptly address blockages. The neutralization mechanism lowers the pH value of the wastewater and achieves rapid and uniform mixing of the water bodies during neutralization. Combined with subsequent activated carbon adsorption, this achieves the final purification effect of the wastewater.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel pickling wastewater technology, and specifically relates to a stainless steel production pickling wastewater treatment system and its treatment process. Background Technology

[0002] Stainless steel requires numerous processing steps during production, including pickling. Pickling is a process that removes impurities and debris such as oxide scale from the surface of stainless steel. Therefore, the acidic wastewater after pickling still contains metal ions and oxide slag, so the wastewater needs to be treated before being discharged. The treatment of acidic wastewater mostly involves using alkaline neutralizing agents to neutralize the acidity, followed by the removal of impurities from the wastewater, including flocculation and sedimentation.

[0003] A search revealed a stainless steel pickling wastewater treatment process and system with publication number CN117865416A. The process includes the following steps: multi-stage wastewater mixing and sedimentation, and ammonia stripping.

[0004] Furthermore, CN113321343A discloses a treatment device and method for pickling wastewater from a stainless steel strip processing line, comprising a collection tank, a sedimentation tank, and a Parshall tank. The collection tank has an inlet on one side, a coarse screen above the inside of the collection tank, a fine screen below the coarse screen, and a support shaft in the middle of the collection tank. However, in this design, when clogging occurs after long-term filtration, the accumulated blockage cannot be cleaned in a timely and effective manner. Therefore, even with preliminary cleaning, the goal of reducing clogging cannot be achieved, necessitating shutdown and replacement, thus affecting the wastewater treatment process.

[0005] Furthermore, a stainless steel pickling wastewater treatment device with announcement number CN217650926U aims to solve the problem that in the existing technology, wastewater treatment devices can only add reagents to fixed points within the treatment device, resulting in poor mixing between the reagents and wastewater. However, based on the attached drawings, it can be clearly seen that the exchange efficiency and effect between the upper and lower water bodies during the mixing process are low, and the mixing effect is only concentrated in the surrounding area of ​​the stirring blades, lacking interference with the upper water body, resulting in poor overall mixing effect between the upper and lower water bodies. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stainless steel production pickling wastewater treatment system and its treatment process. The wastewater is filtered in the filter chamber, which can initially filter and remove impurities in the wastewater to a large extent and can deal with blockages in a timely manner. Then, the wastewater is neutralized by the neutralization mechanism to reduce the pH value of the wastewater. During neutralization, the water body can be quickly and evenly stirred. Combined with subsequent activated carbon adsorption, the final treatment and purification effect of the wastewater is achieved.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A treatment process for pickling wastewater from stainless steel production includes the following steps:

[0009] 1) Preliminary filtration in the filter chamber: Wastewater enters the filter chamber through the first inlet pipe and passes through the filter plates to perform preliminary filtration of larger impurities in the pickling wastewater; during the filtration process, the regulating plate can be driven by the first motor to rotate around the first rotating shaft, so that the regulating plate pushes the filter plates for alternating use; the filter plate has a hole diameter of 2-3mm, and under continuous water intake filtration, the interval between alternating use of the two filter plates is 1.5-2 hours. The first motor speed is 80r / min, and through the coupling and reducer, the regulating plate completes the rotation and pushes the filter plates for alternating use within 30-35 seconds;

[0010] The angle between the installed filter plate and the side wall of the filter chamber is 45-55°, with the optimal angle being 50°.

[0011] The pipe head completes the switching in 8-10 seconds, allowing wastewater to flush the alternating filter plates.

[0012] 2) Neutralization treatment: The pre-filtered acidic wastewater enters the neutralization tank through the second inlet pipe; then an alkaline neutralizing agent, sodium hydroxide, is added, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 40-50 r / min; the mixing time is set to 20-30 min; after mixing and neutralization, the mixture is allowed to stand for 8-10 min to allow some impurities to settle; then the pH value is monitored by a monitoring instrument, and if it meets the requirements, it proceeds to the next treatment process;

[0013] 3) Flocculation treatment by coagulation mechanism: Flocculants are added to the coagulation mechanism to flocculate and precipitate fine impurities in wastewater; the coagulation tank adopts a conventional open square tank with a mixing and stirring mechanism inside. The flocculant dosage is set at 50-200mg / L, and the intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing.

[0014] Mix for 20-25 minutes, then let stand for 5 minutes.

[0015] The two-stage mixing time is 15-25 minutes, and the settling time is 5-10 minutes.

[0016] The three-stage mixing time is 10-15 minutes. After the three-stage mixing and stirring are completed, let it stand until sedimentation is complete. The standing treatment is to give the flocculant sufficient time to combine with the fine impurities in the wastewater.

[0017] 4) Activated carbon adsorption treatment: Wastewater after coagulation is pumped into an activated carbon adsorption unit for adsorption treatment. The activated carbon adsorption uses a conventional square adsorption tank combined with activated carbon adsorption plates for filtration and adsorption. The activated carbon adsorption plates are constructed by filling them with activated carbon granules; this is a conventional and existing technology. The particle size of the activated carbon granules is 0.5-2.55 mm; the bulk density of the activated carbon granules is 0.4-0.5 g / cm³. 3 The thickness of the activated carbon adsorption plate is 50-90mm; the activated carbon adsorption plate is regenerated using high-temperature steam at 800-950℃.

[0018] 5) Wastewater and sludge post-treatment: Qualified wastewater enters the discharge procedure and is discharged in sequence. Then, the sediment in the coagulation sedimentation and neutralization tank is dewatered.

[0019] A stainless steel production pickling wastewater treatment system includes a filter chamber, a neutralization mechanism, a coagulation mechanism, and an activated carbon adsorption mechanism arranged in sequence. The pickling wastewater is initially filtered through the filter chamber, then enters the neutralization mechanism for acid-base neutralization, then enters the coagulation mechanism for flocculation and sedimentation, and finally the wastewater is discharged and the sludge is dewatered and transferred.

[0020] The filter chamber has a first guide groove and a second guide groove on its inner wall. An adjusting plate is installed inside the filter chamber. First rotating shafts are located on both sides of the bottom of the adjusting plate, rotatably connecting to the side walls of the filter chamber. A first worm gear is mounted on the first rotating shaft. A first motor, fixed to the outer wall of the filter chamber via a motor mount, is located on the outer wall of the filter chamber. A first worm gear, fixed to the end of the motor shaft via a bearing mount, meshes with the first worm gear. First discharge ports, capable of opening and closing, are located on both sides of the adjusting plate. Filter plates are symmetrically arranged on both sides of the adjusting plate. Each filter plate has a limiting shaft and a second rotating shaft. A guide plate is located below the filter plate to collect any missed filter material. The guide plate is aligned with the first discharge port. The filter plates are aligned with the first discharge port. The second rotating shaft is located within the first guide groove, and the limiting shaft is located within the second guide groove. The filter plate is installed by sliding the second rotating shaft and the limiting shaft smoothly within the first guide groove. The filter plate can rotate around the second rotating shaft as its axis. The second guide groove is arc-shaped and uses the second rotating shaft on the installed filter plate as its axis, allowing the limiting shaft to slide within the second guide groove.

[0021] A mounting plate is provided on the side wall of the filter chamber. The mounting plate is equipped with a fixed first water inlet pipe. The first water inlet pipe is equipped with a pipe head connected by a rotary joint. The outer wall of the pipe head is provided with teeth. A third motor is provided on the mounting plate. The output shaft of the third motor is equipped with a gear that meshes with the teeth on the outer wall of the pipe head. The third motor drives the pipe head to rotate so that the pipe head aligns with the filter plate. A drain pipe is provided at the bottom of the filter chamber.

[0022] When the filter chamber initially filters out larger impurities in the wastewater, the wastewater enters through the first inlet pipe and washes the filter plate along the pipe head. When a large amount of impurities accumulate on the filter plate, the first motor drives the first worm gear to rotate, which in turn drives the first worm wheel to rotate, causing the adjusting plate to rotate around the first rotating shaft. This pushes the filter plate with accumulated impurities to rotate and rise around the second rotating shaft, and at the same time, the first discharge port opens, allowing the impurities on the filter plate to be discharged through the first discharge port. At this time, when the adjusting plate pushes one side of the filter plate, the filter plate on the other side will slide along the second guide groove due to its own gravity until it stops. The third motor drives the pipe head to rotate so that the pipe head is aligned with the opened filter plate and then water is released for filtration. Furthermore, when the filter plate is severely clogged, the filter plate can be pushed until the limiting shaft and the second rotating shaft are synchronously located in the first guide groove, and then the filter plate can be lifted vertically to be removed for quick replacement.

[0023] The neutralization mechanism includes a neutralization tank, a main shaft, a second motor, a control mechanism, an adjustment mechanism, and a stirring mechanism. A pair of control mechanisms are symmetrically located on both sides of the neutralization tank. The main shaft is located inside the neutralization tank and is rotatably connected to it. The second motor is located on the top of the neutralization tank and fixed by a motor mount; the output shaft of the second motor is connected to the top of the main shaft. The adjustment mechanism is located on the top of the neutralization tank and connected to the control mechanisms. A pair of stirring mechanisms are located on the main shaft. The second motor provides power to drive the adjustment mechanism and the control mechanism, thereby controlling the stirring mechanism to accelerate the neutralization effect. The top of the neutralization tank also has a feeding pipe, a pumping pipe, and a second water inlet pipe. The feeding pipe is used to add neutralizing agent, the second water inlet pipe is connected to the drain pipe for water inlet, and the pumping pipe is close to the inner wall of the neutralization tank, with its opening adjustable in depth for pumping water into the next processing stage.

[0024] The neutralization tank has a conical platform at the bottom and a second discharge port that can be opened and closed. The main shaft is rotatably connected to the top wall of the neutralization tank and the conical platform. The main shaft has an installation groove and is composed of two semi-cylinders fixed together with bolts. The top of the main shaft has a bevel gear. A monitoring instrument for pH value monitoring is provided on the side wall of the neutralization tank.

[0025] The control mechanism includes an installation chamber, a first wedge block, a second wedge block, a top shaft, and a first spring. The installation chamber is fixed to the side wall of the neutralization tank and has a first through groove. The first and second wedge blocks are arranged vertically and fixedly connected by a connecting plate. The connecting plate has a limiting block that is positioned within the first through groove for limiting movement. The wedge surfaces of the first and second wedge blocks are opposite each other, with the wedge surface of the first wedge block facing the side wall of the neutralization tank. The second wedge block has a second through groove to avoid the top shaft. The first wedge block has a fixing rod that is slidably connected to the top wall of the installation chamber. The top shaft has a pair of components that are respectively positioned opposite to the side wall of the neutralization tank. The device comprises a first wedge block and a second wedge block; the top shaft passes through the side wall of the neutralization tank and is slidably connected, and a ball head is provided on the top shaft, which contacts the wedge surface of the first wedge block and the second wedge block; one end of the top shaft at the second wedge block also passes through the side wall of the installation chamber and is slidably connected; the first spring is sleeved on the top shaft, and the first spring on the top shaft corresponding to the first wedge block contacts the side wall of the neutralization tank and the ball head, and the first spring on the top shaft corresponding to the second wedge block contacts the ball head and the side wall of the installation chamber; by setting the contact position of the first spring, the sliding directions of the top shaft at the first wedge block and the top shaft at the second wedge block are opposite when they move at the same time.

[0026] The adjustment mechanism includes a power shaft, a first adjusting arm, a first connecting rod, a third rotating shaft, and a fixed plate. A pair of fixed plates are fixed to the top of the neutralization tank. The power shaft is rotatably connected to the fixed plates at both ends and has sprockets. A pair of first adjusting arms are fixed to both ends of the power shaft. One end of the first connecting rod is hinged to the end of the first adjusting arm, and the other end is hinged to the end of the fixed rod. The third rotating shaft is rotatably connected to the motor base and the fixed plate. A bevel gear is mounted on the third rotating shaft and meshes with a bevel gear on the main shaft. A sprocket is also mounted on the third rotating shaft and connected to the sprocket on the power shaft via a chain. A second motor drives the third rotating shaft to rotate, which in turn drives the power shaft to rotate, thereby using the first connecting rod to operate the control mechanism.

[0027] The stirring mechanism includes a first fixed shaft, a mounting block, a second fixed shaft, and arc-shaped arms. The mounting block has a pair of first fixed shafts inserted into it, and the mounting block and the first fixed shaft are slidably connected. The mounting block and the first fixed shaft are located in a mounting groove. The first fixed shaft is fixedly connected to a main shaft. A second spring is sleeved on the first fixed shaft, and the second spring contacts the mounting block. The mounting block has two fixedly connected second fixed shafts at both ends. The second fixed shaft has a first fan plate and a second fan plate rotatably connected to it. A crossbar is also provided on the second fixed shaft, located between the first and second fan plates. The arc-shaped arms are a pair symmetrically arranged, located between the mounting blocks. A second connecting rod is hinged on the arc-shaped arms, with one end of the second connecting rod hinged to the end of the crossbar. The arc-shaped arms push the top shaft. A control mechanism controls the top shaft to push out, thereby pushing the arc-shaped arms to move, which in turn, in conjunction with the second connecting rod, pushes the second fixed shaft up and down along the first fixed shaft.

[0028] Furthermore, the second fan plate is simultaneously slidably connected to and rotatably connected to the second fixed shaft. A third spring is provided on one side of the second fan plate to sleeve the second fixed shaft, and a limiting plate is fixed to the end of the second fixed shaft by bolts. The third spring touches the limiting plate and the second fan plate, pushing the second fan plate to slide on the second fixed shaft.

[0029] Furthermore, the arc-shaped arm section is provided with a guide block, and the maximum distance that one end of the top shaft extends into the neutralization tank can touch the guide block. When the stirring mechanism rotates with the main shaft, the top shaft can smoothly slide and touch the side wall of the arc-shaped arm after disengaging from the arc-shaped arm through the top contact of the guide block.

[0030] Furthermore, a circular plate is provided on one side of the second panel to contact the third spring and facilitate the bearing of the spring's thrust.

[0031] Furthermore, a lever is provided at the bottom of the main shaft. The lever is arc-shaped. When the main shaft rotates, the debris settled at the bottom of the neutralization tank is agitated by the protruding arc surface on the lever and finally discharged at the second discharge port.

[0032] Furthermore, the top end of the top shaft is provided with a top block to increase the contact area between the top shaft and the arc-shaped arm, which can effectively ensure smooth contact between the top shaft and the arc-shaped arm.

[0033] The advantages of this invention compared to existing technologies are as follows:

[0034] 1) This solution includes a filter chamber for preliminary filtration of wastewater. Wastewater enters through the first inlet pipe and washes the filter plate along the pipe head. When a lot of debris accumulates on the filter plate, the first motor drives the first worm gear to rotate, which in turn drives the first worm wheel to rotate, causing the adjusting plate to rotate around the first rotating shaft. This pushes the filter plate with accumulated debris to rotate and rise around the second rotating shaft, and at the same time, the first discharge port opens, allowing the debris on the filter plate to be discharged through the first discharge port. This repeated operation can remove the debris from the filter plate without the need to frequently replace the filter plate, maintaining the continuous use of the filter plate and reducing the clogging of debris. At the same time, the inclined filter plate also helps the filtered debris to accumulate at the bottom of the filter plate during filtration, reducing the clogging of the water receiving part of the filter plate.

[0035] Furthermore, when the adjusting plate pushes one side of the filter plate, the filter plate on the other side will slide along the second guide groove due to its own gravity until it stops. The third motor can drive the pipe head to rotate so that the pipe head is aligned with the opened filter plate and then water is released for filtration. This enables the rapid alternation of filter plates to maintain the continuous filtration effect of wastewater. Furthermore, when the filter plate is severely clogged, the filter plate can be pushed up so that the limiting shaft and the second rotating shaft are synchronously located in the first guide groove. Then, the filter plate can be vertically lifted out for quick replacement to ensure filtration efficiency.

[0036] 2) In the neutralization mechanism, the control mechanism, in conjunction with the adjustment mechanism, drives the stirring mechanism to stir the wastewater and neutralizing agent, accelerating the mixing process. The power shaft in the adjustment mechanism drives the first and second wedge blocks in the control mechanism to move up and down reciprocally within the installation chamber, thereby pushing the top shaft to reciprocate in and out of the neutralization tank. This pushes the arc arm, and with the thrust of the second spring, the arc arm moves back and forth. The reciprocating movement of the arc arm can pull the second fixed shaft up and down in the installation slot via the second connecting rod, ultimately driving the first and second plates to move up and down in the neutralization tank. This causes the stirring area and position of the first and second plates to constantly change up and down, realizing a mixing mechanism based on the positional differences between the upper and lower areas. This results in alternating rapid mixing and relatively slowed mixing in the upper and lower areas. When mixing is slowed down, sufficient time is provided for the neutralization reaction. When mixing is accelerated, the mixing efficiency of the neutralizing agent and wastewater is improved. The combination of both ultimately increases the neutralization rate.

[0037] 3) The second plate can also slide and rotate on the second fixed shaft. Combined with the push of the third spring and the centrifugal force generated when the main shaft rotates, it can not only rotate on the second fixed shaft but also slide. This allows the mixing area to be changed during the rotation and stirring process, increasing the mixing area of ​​the first and second plates in the neutralization tank and improving the mixing effect and rate. Furthermore, the flocculation treatment of the coagulation mechanism uses a three-stage intermittent mixing and stirring method to mix the flocculant and wastewater. There are different time periods for settling between each mixing stage, which can give the flocculant and fine impurities in the wastewater sufficient time to combine. Attached Figure Description

[0038] Appendix Figure 1 This invention relates to a stainless steel production pickling wastewater treatment system and its treatment process flow diagram.

[0039] Appendix Figure 2 This is a structural diagram of the filter chamber. Figure 1 ;

[0040] Appendix Figure 3 This is a structural diagram of the filter chamber. Figure 2 ;

[0041] Appendix Figure 4 This is a schematic diagram of the filter chamber. Figure 3 ;

[0042] Appendix Figure 5 This is a schematic diagram of the neutralization mechanism. Figure 1 ;

[0043] Appendix Figure 6 This is a schematic diagram of the neutralization mechanism. Figure 2 ;

[0044] Appendix Figure 7 This is a schematic diagram of the internal structure of the neutralization tank. Figure 1 ;

[0045] Appendix Figure 8 This is a schematic diagram of the internal structure of the neutralization tank. Figure 2 ;

[0046] Appendix Figure 9 This is a schematic diagram of the stirring mechanism. Figure 1 ;

[0047] Appendix Figure 10 This is a schematic diagram of the stirring mechanism. Figure 2 ;

[0048] Appendix Figure 11 This is a schematic diagram of the top shaft structure;

[0049] In the diagram: 1. Filter chamber; 11. First guide groove; 12. Second guide groove; 13. First discharge port; 131. Guide plate; 14. Adjusting plate; 141. First rotating shaft; 142. First worm gear; 15. First motor; 151. First worm; 16. Filter plate; 161. Limiting shaft; 162. Second rotating shaft; 17. First water inlet pipe; 18. Pipe head; 181. Tooth; 19. Third motor; 191. Mounting plate; 101. Drain pipe;

[0050] 2. Neutralization mechanism; 21. Neutralization tank; 211. Second discharge port; 212. Conical platform; 22. Main shaft; 221. Mounting groove; 222. Lever; 23. Second motor;

[0051] 24. Control mechanism; 241. Installation chamber; 2411. First through slot; 242. First wedge block; 2421. Connecting plate; 2422. Limiting block; 2423. Fixing rod; 243. Second wedge block; 2431. Second through slot; 244. Top shaft; 2441. Ball head; 245. First spring; 246. Top block;

[0052] 25. Adjustment mechanism; 251. Power shaft; 252. First adjusting arm; 253. First connecting rod; 254. Third rotating shaft; 255. Fixing plate;

[0053] 26. Stirring mechanism; 261. First fixed shaft; 2611. Second spring; 262. Mounting block; 263. Second fixed shaft; 2631. First fan plate; 2632. Second fan plate; 26321. Circular plate; 2633. Crossbar; 2635. Third spring; 2636. Limiting plate; 264. Arc arm; 2641. Second connecting rod; 2642. Guide block;

[0054] 3. Pumping pipe; 4. Feeding pipe; 5. Second water inlet pipe; 6. Monitoring instrument. Detailed Implementation

[0055] To facilitate understanding by those skilled in the art, the following is in conjunction with the appendix. Figure 1-11 The technical solution of the present invention will be further described in detail below.

[0056] Example 1:

[0057] The specific steps of the processing technology are as follows:

[0058] 1) Preliminary filtration in the filter chamber: Wastewater enters the filter chamber through the first inlet pipe and is initially filtered by the filter plates to remove larger impurities from the pickling wastewater. During the filtration process, the regulating plate is driven by the first motor to rotate around the first shaft, allowing the regulating plate to push the filter plates for alternating use. The filter plates have a pore size of 2mm. Under continuous filtration, the interval between the alternation of the two filter plates is 1.5 seconds. The first motor rotates at 80r / min, and through the coupling and reducer, the regulating plate completes the rotation and pushes the filter plates for alternating use within 30 seconds.

[0059] The angle between the installed filter plate and the side wall of the filter chamber is 50°.

[0060] The pipe head completes the switching in 8 seconds, allowing wastewater to flush the alternating filter plates.

[0061] 2) Neutralization treatment: The pre-filtered acidic wastewater enters the neutralization tank through the second inlet pipe; then an alkaline neutralizing agent, sodium hydroxide, is added, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 40 r / min; the mixing time is set to 20 min; after mixing and neutralization, it is allowed to stand for 8 min to allow some impurities to precipitate; then the pH value is monitored by a monitoring instrument, and if it meets the requirements, it enters the next treatment process;

[0062] 3) Flocculation treatment by coagulation mechanism; fine impurities in wastewater are flocculated and precipitated by adding flocculant to the coagulation mechanism; the coagulation tank adopts a conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 50mg / L, and the intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing.

[0063] Mix for 20 minutes, then let stand for 5 minutes.

[0064] The two-stage mixing time is 15 minutes, and the settling time is [min].

[0065] The three-stage mixing time is 10 minutes. After the three-stage mixing and stirring are completed, the mixture should be allowed to stand until sedimentation is complete. The standing treatment is to give the flocculant sufficient time to combine with the fine impurities in the wastewater.

[0066] 4) Activated carbon adsorption treatment: Wastewater after coagulation is pumped into the activated carbon adsorption unit for adsorption treatment. The activated carbon adsorption uses a conventional square adsorption tank combined with activated carbon adsorption plates for filtration and adsorption. The activated carbon adsorption plates are constructed by filling them with activated carbon granules; this is a conventional, existing technology. The particle size of the activated carbon granules is 0.5 mm; the bulk density of the activated carbon granules is 0.4 g / cm³. 3 The activated carbon adsorption plate is 50mm thick; the activated carbon adsorption plate is regenerated using 800℃ high-temperature steam.

[0067] 5) Wastewater and sludge post-treatment: Qualified wastewater enters the discharge procedure and is discharged in sequence. Then, the sediment in the coagulation sedimentation and neutralization tank is dewatered.

[0068] A stainless steel production pickling wastewater treatment system includes a filter chamber 1, a neutralization mechanism 2, a coagulation mechanism, and an activated carbon adsorption mechanism arranged in sequence. The pickling wastewater is initially filtered through the filter chamber 1, then enters the neutralization mechanism 2 for acid-base neutralization, then enters the coagulation mechanism for flocculation and sedimentation, and finally the wastewater is discharged and the sludge is dewatered and transferred.

[0069] The filter chamber 1 has a first guide groove 11 and a second guide groove 12 on its inner wall. An adjusting plate 14 is installed inside the filter chamber 1. First rotating shafts 141 are located on both sides of the bottom of the adjusting plate 14, rotatably connecting to the side walls of the filter chamber 1. A first worm gear 142 is mounted on the first rotating shaft 141. A first motor 15, fixed to the outer wall of the filter chamber 1 via a motor mount, is installed on the shaft end of the first motor 15, with a first worm gear 151 fixed to the shaft via a bearing mount. The first worm gear 151 meshes with the first worm gear 142. First discharge ports 13, capable of opening and closing, are located on both sides of the adjusting plate 14. Filter plates 16 are symmetrically arranged on both sides of the adjusting plate 14. The filter plate 16 is provided with a limiting shaft 161 and a second rotating shaft 162. A guide plate 131 is provided below the filter plate 16 to receive any missed filter material. The guide plate 131 is aligned with the first discharge port 13. The filter plate 16 is aligned with the first discharge port 13. The second rotating shaft 162 is located in the first guide groove 11, and the limiting shaft 161 is located in the second guide groove 12. The filter plate is installed by sliding the second rotating shaft and the limiting shaft smoothly in the first guide groove. The filter plate can rotate around the second rotating shaft as its axis. The second guide groove is arc-shaped and uses the second rotating shaft on the filter plate after installation as its axis, so that the limiting shaft can slide in the second guide groove.

[0070] A mounting plate 191 is provided on the side wall of the filter chamber 1. The mounting plate 191 is provided with a fixed first water inlet pipe 17. The first water inlet pipe 17 is provided with a pipe head 18 connected by a rotary joint. The outer wall of the pipe head 18 is provided with teeth 181. A third motor 19 is provided on the mounting plate 191. The output shaft of the third motor 19 is provided with a gear that meshes with the teeth 181 on the outer wall of the pipe head 18. The third motor 19 drives the pipe head 18 to rotate so that the pipe head 18 aligns with the filter plate 16. A drain pipe 101 is provided at the bottom of the filter chamber 1.

[0071] When the filter chamber 1 initially filters larger impurities from the wastewater, the wastewater enters through the first inlet pipe 17 and washes the filter plate 16 along the pipe head 18. When a large amount of impurities accumulate on the filter plate 16, the first motor 15 drives the first worm gear 151 to rotate, which in turn drives the first worm wheel 142 to rotate. This causes the adjusting plate 14 to rotate around the first rotating shaft 141, pushing the filter plate 16 with accumulated impurities to rotate and rise around the second rotating shaft 162. The limiting shaft slides in the second guide groove, and at the same time, the first discharge port 13 is opened, allowing the impurities on the filter plate 16 to flow along the second guide groove. Discharge is discharged from the discharge port 13. At this time, when the adjusting plate 14 pushes the filter plate 16 on one side, the filter plate 16 on the other side will slide along the second guide groove 12 due to its own gravity until it stops. The third motor 19 drives the tube head 18 to rotate so that the tube head 18 is aligned with the opened filter plate 16 and then water is discharged for filtration. Furthermore, when the filter plate 16 is severely blocked, the filter plate 16 can be pushed so that the limiting shaft 161 and the second rotating shaft 162 are synchronously located in the first guide groove 11, and then the filter plate 16 can be lifted vertically to be taken out for quick replacement.

[0072] The neutralization mechanism 2 includes a neutralization tank 21, a main shaft 22, a second motor 23, a control mechanism 24, an adjustment mechanism 25, and a stirring mechanism 26. A pair of control mechanisms 24 are symmetrically arranged on both sides of the neutralization tank 21. The main shaft 22 is located inside the neutralization tank 21 and is rotatably connected to it. The second motor 23 is located on the top of the neutralization tank 21 and fixed by a motor mount. The output shaft of the second motor 23 is connected to the top of the main shaft 22. The adjustment mechanism 25 is located on the top of the neutralization tank 21 and connected to the control mechanism 24. A pair of stirring mechanisms 26 are located on the main shaft 22. The second motor 23 provides power to drive the adjustment mechanism 25 and the control mechanism 24, thereby controlling the stirring mechanism 26 to accelerate the neutralization effect. The top of the neutralization tank 21 is also equipped with a feeding pipe 4, a water suction pipe 3, and a second water inlet pipe 5. The feeding pipe 4 is used to add neutralizing agent. The second water inlet pipe 5 is connected to the drain pipe 101 for water intake. The water suction pipe 3 is close to the inner wall of the neutralization tank 21, and its opening can be adjusted vertically to pump water into the next processing stage.

[0073] The neutralization tank 21 has a conical platform 212 at its bottom and a second discharge port 211 that can be opened and closed. The main shaft 22 is rotatably connected to the top wall of the neutralization tank 21 and the conical platform 212. The main shaft 22 has a mounting groove 221. The main shaft 22 is composed of two semi-cylinders and is fixed with bolts. The top of the main shaft 22 is provided with a bevel gear. The side wall of the neutralization tank 21 is provided with a pH monitoring instrument 6. This monitoring instrument 6 is purchased from the market and is model PHS-3C.

[0074] The control mechanism 24 includes an installation chamber 241, a first wedge block 242, a second wedge block 243, a top shaft 244, and a first spring 245. The installation chamber 241 is fixed to the side wall of the neutralization tank 21 and has a first through groove 2411. The first wedge block 242 and the second wedge block 243 are arranged vertically and fixedly connected by a connecting plate 2421. The connecting plate 2421 has a limiting block 2422, which is located in the first through groove 2411 for limiting movement. The wedge surfaces of the first wedge block 242 and the second wedge block 243 are arranged opposite each other, with the wedge surface of the first wedge block 242 facing the side wall of the neutralization tank 21. The second wedge block 243 has a second through groove 2431 to avoid the top shaft 244. The first wedge block 242 has a fixing rod 2423, which is slidably connected to the top wall of the installation chamber 241. The top shaft 244 has a pair of parallel... The first wedge block 242 and the second wedge block 243 are respectively connected; the top shaft 244 passes through the side wall of the neutralization tank 21 and is slidably connected; the top shaft 244 is provided with a ball head 2441, which touches the wedge surface of the first wedge block 242 and the second wedge block 243; one end of the top shaft 244 at the second wedge block 243 also passes through the side wall of the installation chamber 241 and is slidably connected; the first spring 245 is sleeved on the top shaft 244; the first spring 245 on the top shaft 244 corresponding to the first wedge block 242 touches the side wall of the neutralization tank 21 and the ball head 2441, and the first spring 245 on the top shaft 244 corresponding to the second wedge block 243 touches the ball head 2441 and the side wall of the installation chamber 241; by setting the position of the first spring 245, the sliding directions of the top shaft at the first wedge block 242 and the top shaft 244 at the second wedge block 243 are opposite when they move at the same time.

[0075] The adjusting mechanism 25 includes a power shaft 251, a first adjusting arm 252, a first connecting rod 253, a third rotating shaft 254, and a fixing plate 255. A pair of fixing plates 255 are fixed to the top of the neutralization tank 21. The two ends of the power shaft 251 are rotatably connected to the fixing plates 255, and a sprocket is mounted on the power shaft 251. A pair of first adjusting arms 252 are respectively fixed to both ends of the power shaft 251. One end of the first connecting rod 253 is hinged to the end of the first adjusting arm 252, and the other end is hinged to the end of the fixing rod 2423. The third rotating shaft 254 rotatably connects to the motor base and the fixing plate 255. A bevel gear is mounted on the third rotating shaft 254 and meshes with the bevel gear on the main shaft 22. A sprocket is also mounted on the third rotating shaft 254 and connected to the sprocket on the power shaft 251 via a chain. The second motor 23 drives the third rotating shaft 254 to rotate, which in turn drives the power shaft 251 to rotate, thereby using the first connecting rod 253 to drive the control mechanism 24 to operate.

[0076] The stirring mechanism 26 includes a first fixed shaft 261, a mounting block 262, a second fixed shaft 263, and an arc-shaped arm 264. The mounting block 262 has a pair of first fixed shafts 261 inserted into it, and the mounting block 262 and the first fixed shafts 261 are slidably connected. The mounting block 262 and the first fixed shafts 261 are located in a mounting groove 221. The first fixed shaft 261 is fixedly connected to the main shaft 22. A second spring 2611 is sleeved on the first fixed shaft 261, and the second spring 2611 contacts the mounting block 262. The mounting block 262 has two fixedly connected second fixed shafts 263 at both ends, and a first fan-shaped plate 2631 is rotatably connected to the second fixed shaft 263. The second panel 2632; the second fixed shaft 263 is also provided with a crossbar 2633, which is located between the first panel 2631 and the second panel 2632. The arc-shaped arms 264 are provided in pairs and symmetrically arranged, and are located between the mounting blocks 262. The arc-shaped arms 264 are provided with a hinged second connecting rod 2641, one end of which is hinged to the end of the crossbar 2633. The arc-shaped arms 264 push the top shaft 244. The top shaft 244 is controlled by the control mechanism 24 to push out, thereby pushing the arc-shaped arms 264 to move, which in turn cooperates with the second connecting rod 2641 to push the second fixed shaft 263 to move up and down along the first fixed shaft 261.

[0077] Furthermore, the second fan plate 2632 is simultaneously slidably connected to and rotatably connected to the second fixed shaft 263. A third spring 2635 is provided on one side of the second fan plate 2632 to sleeve the second fixed shaft 263, and a limiting plate 2636 is fixed to the end of the second fixed shaft 263 by bolts. The third spring 2635 touches the limiting plate 2636 and the second fan plate 2632, pushing the second fan plate 2632 to slide on the second fixed shaft 263.

[0078] Furthermore, the arc-shaped arm 264 section is provided with a guide block 2642. The maximum distance that one end of the top shaft 244 extends into the neutralization tank 21 can touch the guide block 2642. When the stirring mechanism 26 rotates with the main shaft 22, after the top shaft 244 disengages from the arc-shaped arm 264, it can smoothly slide and touch the side wall of the arc-shaped arm 264 through the top contact of the guide block 2642.

[0079] Furthermore, a circular plate 26321 is provided on one side of the second panel 2632 for contacting the third spring 2635 to facilitate receiving the spring's thrust.

[0080] Furthermore, a lever 222 is provided at the bottom of the main shaft 22. The lever 222 is arc-shaped. When the main shaft 22 rotates, the debris settled at the bottom of the neutralization tank 21 is agitated by the protruding arc surface on the lever 222 and finally discharged at the second discharge port 211.

[0081] Furthermore, the top end of the top shaft 244 is provided with a top block 246 to increase the contact area between the top shaft 244 and the arc-shaped arm 264, which can effectively ensure that the top shaft 244 and the arc-shaped arm 264 make smooth contact.

[0082] When neutralization mechanism 2 neutralizes the acid and alkali of wastewater, neutralizing agent is added through feeding pipe 4. Then, second motor 23 drives main shaft 22 to rotate, which in turn drives power shaft 251 in adjustment mechanism 25 to rotate. This, in turn, moves first connecting rod 253 to pull fixed rod 2423, causing first wedge block 242 and second wedge block 243 to move up and down reciprocally within installation chamber 241. This causes first wedge block 242 and second wedge block 243 to push one end of top shaft 244 to extend and retract inside neutralization tank 21. Because the wedge surfaces of first wedge block 242 and second wedge block 243 are set opposite to each other, the sliding directions of the pair of top shafts 244 are always opposite. Finally, the top shafts 244 push the arc arm 264 to move. The arc-shaped arm 264, in conjunction with the second connecting rod 2641, moves the second fixed shaft 263 within the mounting groove 221. When the top shaft 244 retracts, the mounting block 262 slides downward under the push of the second spring 2611, thereby changing the rotational positions of the first fan plate 2631 and the second fan plate 2632. Furthermore, the centrifugal force generated by the rotation of the main shaft 22 and the cooperation of the third spring 2635 enable the second fan plate 2632 to slide on the second fixed shaft 263, changing the stirring range. As the main shaft 22 rotates, the first fan plate 2631 and the second fan plate 2632 rotate along the second fixed shaft 263 under the resistance of the water flow, continuously changing their positions within the neutralization tank 21, effectively accelerating the mixing and neutralization process.

[0083] Example 2:

[0084] The difference compared to Example 1 is:

[0085] Step 2) Neutralization treatment by neutralization mechanism: The acidic wastewater that has been preliminarily filtered enters the neutralization tank through the second inlet pipe; then an alkaline neutralizing agent, sodium hydroxide, is added, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 50 r / min; the mixing and stirring time is set to 30 min; after mixing and neutralization, the mixture is allowed to stand for 10 min to allow some of the impurities to precipitate.

[0086] Step 3) Flocculation treatment by coagulation mechanism; fine impurities in wastewater are flocculated and precipitated by adding flocculant to the coagulation mechanism; the coagulation tank adopts a conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 200mg / L, and the intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing.

[0087] Mix for 25 minutes, then let stand for 5 minutes.

[0088] The two-stage mixing time is 125 minutes, and the settling time is 10 minutes.

[0089] The three-stage mixing time is 15 minutes. After the three-stage mixing and stirring are completed, the mixture should be allowed to stand until sedimentation is complete. The standing treatment is to give the flocculant sufficient time to combine with the fine impurities in the wastewater.

[0090] 4) Activated carbon adsorption treatment: Wastewater after coagulation is pumped into the activated carbon adsorption unit for adsorption treatment. The activated carbon adsorption uses a conventional square adsorption tank combined with activated carbon adsorption plates for filtration and adsorption. The activated carbon adsorption plates are constructed by filling them with activated carbon granules; this is a conventional, existing technology. The particle size of the activated carbon granules is 2.55 mm; the bulk density of the activated carbon granules is 0.5 g / cm³. 3 The activated carbon adsorption plate is 90mm thick; the activated carbon adsorption plate is regenerated using high-temperature steam at 950℃.

[0091] Example 3:

[0092] The difference compared to Example 1 is:

[0093] 2) Neutralization treatment by neutralization mechanism: The acidic wastewater that has been initially filtered enters the neutralization tank through the second inlet pipe; then an alkaline neutralizing agent, sodium hydroxide, is added, and neutralization is carried out by rotating the main shaft; the main shaft speed is set to 45 r / min; the mixing time is set to 25 min, and after mixing and neutralization, it is allowed to stand for 9 min to allow some of the impurities to precipitate.

[0094] 3) Flocculation treatment by coagulation mechanism; fine impurities in wastewater are flocculated and precipitated by adding flocculant to the coagulation mechanism; the coagulation tank adopts a conventional open square tank with a mixing and stirring mechanism inside, the flocculant dosage is set at 100mg / L, and the intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing.

[0095] The mixing time is 22 minutes, followed by a 5-minute resting period.

[0096] The two-stage mixing time is 20 minutes, and the settling time is 8 minutes.

[0097] The three-stage mixing time is 13 minutes. After the three-stage mixing and stirring are completed, the mixture should be allowed to stand until sedimentation is complete. The standing treatment is to give the flocculant sufficient time to combine with the fine impurities in the wastewater.

[0098] 4) Activated carbon adsorption treatment: Wastewater after coagulation is pumped into the activated carbon adsorption unit for adsorption treatment. The activated carbon adsorption uses a conventional square adsorption tank combined with activated carbon adsorption plates for filtration and adsorption. The activated carbon adsorption plates are constructed by filling them with activated carbon granules; this is a conventional and existing technology. The particle size of the activated carbon granules is 1 mm; the bulk density of the activated carbon granules is 0.45 g / cm³. 3 The activated carbon adsorption plate is 70mm thick; the activated carbon adsorption plate is regenerated using high-temperature steam at 850℃.

[0099] Comparative Example 1:

[0100] The difference compared to Example 1 is in step 2) the neutralization process: the spindle speed is set to 30 r / min; the mixing time is set to 15 min; and after mixing and neutralization, the mixture is allowed to stand for 8 min.

[0101] Comparative Example 2:

[0102] The difference compared to Example 1 is as follows: Step 2) Neutralization process: The spindle speed is set to 65 r / min; the mixing time is set to 40 min; after mixing and neutralization, the mixture is allowed to stand for 15 min.

[0103] Comparative Example 3:

[0104] The difference compared to Example 1 is that: Step 3) flocculation treatment of the coagulation mechanism, the flocculant dosage is set at 40mg / L, and an intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing;

[0105] Mix for 15 minutes, then let stand for 5 minutes.

[0106] The two-stage mixing time is 10 minutes, and the settling time is 5 minutes.

[0107] The three-stage mixing time is 8 minutes;

[0108] Comparative Example 4:

[0109] The difference from Example 1 is that in step 3), the flocculation treatment of the coagulation mechanism is carried out with a flocculant dosage of 220 mg / L, and an intermittent mixing and stirring method is adopted, which is divided into 3 stages of mixing.

[0110] Mix for 30 minutes, then let stand for 5 minutes.

[0111] The two-stage mixing time is 30 minutes, and the settling time is 15 minutes.

[0112] The three-stage mixing time is 20 minutes;

[0113] Test Example 1: The difference from Example 1 is that this implementation did not use the initial filtration in step 1), but directly introduced step 2).

[0114] Test Example 2: The difference from Example 1 is that in step 3), the flocculation treatment of the coagulation mechanism adopts a one-stage mixing method; the mixing time is 55 minutes.

[0115] The results of the above-mentioned examples, comparative examples, and test cases were checked and measured according to GB13456-2012 "Emission Standard of Water Pollutants for Iron and Steel Industry".

[0116] pH value (6-9) iron ions mg / L Suspended matter mg / L Fluoride mg / L in conclusion Example 1 7 1.4 18 8.6 qualified Example 2 7.5 1.35 17.5 7.4 qualified Example 3 8.5 1.5 16 8.2 qualified Comparative Example 1 5.3 2.2 22.5 11.5 Unqualified Comparative Example 2 6.8 1.95 18.3 9 qualified Comparative Example 3 7.2 3.1 24.6 8.6 Unqualified Comparative Example 4 7.3 2.35 26.8 11.5 Unqualified Test Example 1 8.2 1.62 27.3 9.2 Unqualified Test Example 2 7.8 1.54 26.2 10.6 Unqualified

[0117] Based on the above standards and implementation results, the following summary is made:

[0118] Examples 1-3 were implemented according to the established process standards, and the wastewater treatment results obtained met all the requirements of the "Water Pollutant Discharge Standard for Iron and Steel Industry".

[0119] The neutralization time of Comparative Example 1 was less than the set range of the process neutralization treatment time. The pH value of the treatment result was lower than the standard, and the treatment values ​​of iron ions, suspended solids and fluorides were higher than the standard.

[0120] In Comparative Example 2, the neutralization time was longer than the set neutralization time of the process. All test values ​​met the standard requirements, but the working time was longer than the set neutralization time, and the processing time was too long.

[0121] In Comparative Example 3, the amount of flocculant added was less than the standard dosage set in the process, and the treatment data for suspended solids was much higher than the wastewater treatment standard.

[0122] In Comparative Example 4, the amount of flocculant added was greater than the standard dosage set in the process. The data for the treatment of suspended solids was much higher than the wastewater treatment standard. The experimental data for suspended solids and iron ions increased instead of decreasing. The reason is that the excessive amount of flocculant added caused suspended solids and iron ions to redissolve, resulting in excessively high data.

[0123] In Example 1, the absence of preliminary filtration resulted in suspended solids levels in the experimental data that did not meet the standards and were significantly higher than in other examples. Therefore, preliminary filtration is necessary to reduce the burden of subsequent processing.

[0124] The suspended solids values ​​in the experimental data of Example 2 did not meet the standards. Using a one-time mixing method was clearly beneficial for observing the treatment process and making timely adjustments.

[0125] Based on the above summary, the process of the present invention has good treatment effect and efficiency for the treatment of stainless steel pickling wastewater.

[0126] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and 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 of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0127] In summary, the electronic or electrical components, including but not limited to motors and monitoring instruments, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0128] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A process for treating pickling wastewater from stainless steel production, characterized in that: The wastewater treatment system comprises a filtration chamber, a neutralization mechanism, a coagulation mechanism, and an activated carbon adsorption mechanism arranged sequentially. The acid washing wastewater undergoes preliminary filtration in the filtration chamber, followed by acid-base neutralization in the neutralization mechanism, then flocculation and sedimentation in the coagulation mechanism. Finally, the wastewater is discharged, and the sludge is dewatered and transferred. The specific treatment process steps are as follows: 1) Preliminary filtration in the filter chamber: Wastewater enters the filter chamber through the first inlet pipe and passes through the filter plates to perform preliminary filtration of larger impurities in the pickling wastewater; during the filtration process, the regulating plate can be driven by the first motor to rotate around the first rotating shaft, so that the regulating plate pushes the filter plates for alternating use; the filter plate has a hole diameter of 2-3mm, and under continuous water intake filtration, the interval between alternating use of the two filter plates is 1.5-2 hours. The first motor speed is 80r / min, and through the coupling and reducer, the regulating plate completes the rotation and pushes the filter plates for alternating use within 30-35 seconds; The angle between the installed filter plate and the side wall of the filter chamber is 45-55°, with the optimal angle being 50°. The pipe head completes the switching in 8-10 seconds, allowing wastewater to flush the alternating filter plates. 2) Neutralization treatment: The acidic wastewater that has been initially filtered enters the neutralization tank through the second inlet pipe; then an alkaline neutralizing agent, sodium hydroxide, is added, and neutralization is carried out by rotating the main shaft; 3) Flocculation treatment by coagulation mechanism: Fine impurities in wastewater are flocculated and precipitated by adding flocculants to the coagulation mechanism; the coagulation tank adopts a conventional open square tank, equipped with a mixing and stirring mechanism, and the flocculant dosage is set at 50-200 mg / L. 4) Activated carbon adsorption treatment: Wastewater after coagulation treatment is pumped into the activated carbon adsorption unit for adsorption treatment. The activated carbon adsorption adopts a conventional square adsorption tank, and the activated carbon adsorption plate is composed of activated carbon particles. 5) Wastewater and sludge post-treatment: Qualified wastewater enters the discharge procedure and is discharged in sequence. Then, the sediment in the coagulation sedimentation and neutralization tank is dewatered. In step 1), the inner wall of the filter chamber is provided with a first guide groove and a second guide groove. An adjusting plate is provided inside the filter chamber. A first rotating shaft is provided on both sides of the bottom of the adjusting plate. The first rotating shaft is rotatably connected to the side wall of the filter chamber. A first worm gear is provided on the first rotating shaft. A first motor is fixed to the outer wall of the filter chamber by a motor seat. A first worm is fixed to the end of the first motor shaft by a bearing seat. The first worm meshes with the first worm gear. A first discharge port that can be opened and closed is provided on both sides of the filter chamber. Filter plates are symmetrically arranged on both sides of the adjusting plate. A limiting shaft and a second rotating shaft are provided on the filter plates. A guide plate is provided below the filter plates to receive the leaked filter material. The guide plate is aligned with the first discharge port. The filter plates are aligned with the first discharge port. The second rotating shaft is located in the first guide groove, and the limiting shaft is located in the second guide groove. The filter plates are installed by sliding the second rotating shaft and the limiting shaft in the first guide groove. The filter plates can rotate around the second rotating shaft as the axis. The second guide groove is arc-shaped and uses the second rotating shaft on the installed filter plate as the axis, so that the limiting shaft can slide in the second guide groove.

2. The stainless steel production pickling wastewater treatment process according to claim 1, characterized in that... In step 2), the spindle speed is set to 40-50 r / min; the mixing time is set to 20-30 min; after mixing and neutralization, the mixture is allowed to stand for 8-10 min to allow some of the impurities to settle; then the pH value is monitored by a monitoring instrument, and if it meets the requirements, the process proceeds to the next step. Step 3) employs an intermittent mixing method, divided into three stages of mixing; Mix for 20-25 minutes, then let stand for 5 minutes. The two-stage mixing time is 15-25 minutes, and the settling time is 5-10 minutes. The three-stage mixing time is 10-15 minutes. After the three-stage mixing and stirring are completed, let it stand until sedimentation is complete. The standing treatment is to give the flocculant sufficient time to combine with the fine impurities in the wastewater. In step 4), the particle size of the granular activated carbon is 0.5-2.55 mm; the bulk density of the activated carbon particles is 0.4-0.5 g / cm³. 3 The thickness of the activated carbon adsorption plate is 50-90mm; the activated carbon adsorption plate is regenerated using high-temperature steam at 800-950℃.

3. The stainless steel production pickling wastewater treatment process according to claim 1, characterized in that... The filter chamber has a mounting plate on its side wall, and the mounting plate has a fixed first water inlet pipe. The first water inlet pipe has a pipe head connected by a rotary joint, and the outer wall of the pipe head has teeth. The mounting plate has a third motor. The output shaft of the third motor has a gear that meshes with the teeth on the outer wall of the pipe head. The third motor drives the pipe head to rotate so that the pipe head aligns with the filter plate. The bottom of the filter chamber has a drain pipe.

4. The stainless steel production pickling wastewater treatment process according to claim 1, characterized in that... The neutralization mechanism in step 2) includes a neutralization tank, a main shaft, a second motor, a control mechanism, an adjustment mechanism, and a stirring mechanism. A pair of control mechanisms are symmetrically located on both sides of the neutralization tank. The main shaft is located inside the neutralization tank and is rotatably connected to it. The second motor is located on the top of the neutralization tank and fixed by a motor mount; the output shaft of the second motor is connected to the top of the main shaft. The adjustment mechanism is located on the top of the neutralization tank and connected to the control mechanism. A pair of stirring mechanisms are located on the main shaft. The second motor provides power to drive the adjustment mechanism and the control mechanism, thereby controlling the stirring mechanism to accelerate the neutralization effect. The top of the neutralization tank also has a feeding pipe, a pumping pipe, and a second water inlet pipe. The feeding pipe is used to add neutralizing agent, the second water inlet pipe is connected to the drain pipe for water inlet, and the pumping pipe is close to the inner wall of the neutralization tank, with its opening adjustable in depth for pumping water into the next processing stage. The neutralization tank has a conical platform at the bottom and a second discharge port that can be opened and closed. The main shaft is rotatably connected to the top wall of the neutralization tank and the conical platform. The main shaft has an installation groove and is composed of two semi-cylinders fixed together with bolts. The top of the main shaft has a bevel gear. A monitoring instrument for pH value monitoring is provided on the side wall of the neutralization tank.

5. The stainless steel production pickling wastewater treatment process according to claim 4, characterized in that... The control mechanism includes an installation chamber, a first wedge block, a second wedge block, a top shaft, and a first spring. The installation chamber is fixed to the side wall of the neutralization tank and has a first through groove. The first and second wedge blocks are arranged vertically and fixedly connected by a connecting plate. The connecting plate has a limiting block that is positioned within the first through groove for limiting movement. The wedge surfaces of the first and second wedge blocks are opposite each other, with the wedge surface of the first wedge block facing the side wall of the neutralization tank. The second wedge block has a second through groove to avoid the top shaft. The first wedge block has a fixing rod that is slidably connected to the top wall of the installation chamber. The top shaft has a pair of components that are respectively positioned opposite to the side wall of the neutralization tank. The device comprises a first wedge block and a second wedge block; the top shaft passes through the side wall of the neutralization tank and is slidably connected, and a ball head is provided on the top shaft, which contacts the wedge surface of the first wedge block and the second wedge block; one end of the top shaft at the second wedge block also passes through the side wall of the installation chamber and is slidably connected; the first spring is sleeved on the top shaft, and the first spring on the top shaft corresponding to the first wedge block contacts the side wall of the neutralization tank and the ball head, and the first spring on the top shaft corresponding to the second wedge block contacts the ball head and the side wall of the installation chamber; by setting the contact position of the first spring, the sliding directions of the top shaft at the first wedge block and the top shaft at the second wedge block are opposite when they move at the same time.

6. The stainless steel production pickling wastewater treatment process according to claim 4, characterized in that... The adjustment mechanism includes a power shaft, a first adjusting arm, a first connecting rod, a third rotating shaft, and a fixed plate. A pair of fixed plates are fixed to the top of the neutralization tank. The power shaft is rotatably connected to the fixed plates at both ends and has sprockets. A pair of first adjusting arms are fixed to both ends of the power shaft. One end of the first connecting rod is hinged to the end of the first adjusting arm, and the other end is hinged to the end of the fixed rod. The third rotating shaft is rotatably connected to the motor base and the fixed plate. A bevel gear is mounted on the third rotating shaft and meshes with a bevel gear on the main shaft. A sprocket is also mounted on the third rotating shaft and connected to the sprocket on the power shaft via a chain. A second motor drives the third rotating shaft to rotate, which in turn drives the power shaft to rotate, thereby using the first connecting rod to operate the control mechanism.

7. The stainless steel production pickling wastewater treatment process according to claim 4, characterized in that... The stirring mechanism includes a first fixed shaft, a mounting block, a second fixed shaft, and arc-shaped arms. The mounting block has a pair of first fixed shafts inserted into it, and the mounting block and the first fixed shaft are slidably connected. The mounting block and the first fixed shaft are located in a mounting groove. The first fixed shaft is fixedly connected to a main shaft. A second spring is sleeved on the first fixed shaft, and the second spring contacts the mounting block. The mounting block has two fixedly connected second fixed shafts at both ends. The second fixed shaft has a first fan plate and a second fan plate rotatably connected to it. A crossbar is also provided on the second fixed shaft, positioned between the first and second fan plates. A pair of arc-shaped arms are provided and symmetrically arranged, positioned between the mounting blocks. A second connecting rod is hinged to each arc-shaped arm, with one end of the second connecting rod hinged to the end of the crossbar. The arc-shaped arms push against the top shaft. A control mechanism controls the top shaft to push out, thereby pushing the arc-shaped arms to move, which in turn, in conjunction with the second connecting rod, pushes the second fixed shaft up and down along the first fixed shaft. The arc-shaped arm section is provided with a guide block. The maximum distance that one end of the top shaft extends into the neutralization tank can touch the guide block. When the stirring mechanism rotates with the main shaft, the top shaft can smoothly slide and touch the side wall of the arc-shaped arm after it leaves the arc-shaped arm through the top contact of the guide block.

8. The stainless steel production pickling wastewater treatment process according to claim 7, characterized in that... The second fan plate is simultaneously slidably connected to and rotatably connected to the second fixed shaft. A third spring is provided on one side of the second fan plate, which is sleeved on the second fixed shaft, and a limiting plate is fixed to the end of the second fixed shaft by bolts. The third spring touches the limiting plate and the second fan plate, pushing the second fan plate to slide on the second fixed shaft. A circular plate is provided on one side of the second panel to contact the third spring and facilitate the bearing of the spring's thrust.

9. The stainless steel production pickling wastewater treatment process according to claim 4, characterized in that... A lever is provided at the bottom of the main shaft. The lever is arc-shaped. When the main shaft rotates, the debris settled at the bottom of the neutralization tank is agitated by the protruding arc surface on the lever and finally discharged at the second discharge port.

10. The stainless steel production pickling wastewater treatment process according to claim 7, characterized in that... The top end of the top shaft is provided with a top block to increase the contact area between the top shaft and the arc arm, which can effectively ensure that the top shaft and the arc arm make smooth contact.

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