Waste steel pickling solution recycling device

Abstract

The invention discloses a steel pickling liquid waste recovery treatment device, and relates to the technical field of pickling liquid waste recovery, the steel pickling liquid waste recovery treatment device comprises a recovery cylinder body, a driving mechanism is assembled above the recovery cylinder body, the recovery cylinder body is formed by combining an inner cylinder body and an outer cylinder body, and an interlayer space is formed between the inner cylinder body and the outer cylinder body and is used for accommodating a thermal insulation material; the pre-mixing assembly realizes high-speed turbulent flow pre-mixing through a waste liquid feeding pipe and a neutralizer feeding pipe which are obliquely and oppositely sprayed, and the stirring magnetic guiding assembly is linked with a lifting strong magnetic core block through a hollow stirring shaft to circularly enhance the magnetic field intensity; the stepped magnetic attraction assembly forms graded adsorption through magnetic attraction blocks which are gradually increased from top to bottom in a gradient mode, the problem that an existing pickling waste liquid treatment device is insufficient in mixing reaction is solved, efficient premixing of pickling waste liquid and effective guiding and stable adsorption of metal impurities are achieved, and the service life of the pickling waste liquid treatment device is prolonged. The thoroughness of waste liquid treatment and the resource recycling efficiency of metal impurities are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of pickling waste liquid recycling technology, specifically to a steel pickling waste liquid recycling and treatment device. Background Technology

[0002] The recycling of pickling wastewater from steel is a core step in achieving the harmless treatment and resource recovery of steel pickling wastewater. It is widely used in industrial scenarios such as steel metallurgy and machining that generate pickling wastewater. It is a key link in industrial wastewater treatment and solid waste resource utilization, directly affecting the environmental compliance level and raw material recovery efficiency of enterprises. Pickling wastewater with different components and impurity contents has significant differences in treatment processes and impurity removal precision. In scenarios with high requirements for treatment effect, such as deep purification of steel pickling wastewater, efficient recovery of metal impurities, and resource reuse of neutralization products, integrated premixing is often required. However, in the treatment environment of conventional pickling wastewater with simple components and low impurity content, a simple neutralization reaction device can meet the basic environmental emission requirements.

[0003] In the prior art, such as the patent with patent number CN216273588U and title "A Steel Pickling Wastewater Recycling and Treatment Equipment", the core of the patent is to use the magnetic sleeve, rotating column, rotating shaft and other structures in the impurity removal device to adsorb and clean the steel material impurities in the waste liquid, and then use the filtration device to realize the wastewater recycling, so as to achieve the effect of environmental protection and resource recycling. While this technology can achieve preliminary removal of metal impurities from pickling wastewater, it has significant drawbacks: First, its impurity removal device relies on a magnetic sleeve fixedly installed on a rotating column for adsorption. Metal impurities are directly adsorbed onto the surface of the stirring element. As the running time increases, impurities accumulate and clump on the stirring element, severely disrupting the uniformity of the stirring flow field. This leads to a significant decrease in the mixing efficiency of the waste liquid and the neutralizing agent, exacerbating localized over-alkali or over-acidity, and consequently affecting the formation of metal hydroxide precipitates and subsequent adsorption effects. Second, its impurity removal device relies on a fixed magnetic sleeve for adsorption. The magnetic field strength is uniformly distributed and cannot be gradient-guided according to the sedimentation path of impurities in the waste liquid, resulting in impurity accumulation and clumping at the bottom and incomplete slag removal. In addition, the device only achieves mixing of waste liquid and neutralizing agent through mechanical stirring, resulting in limited mixing uniformity and a tendency for localized over-alkali or over-acidity, affecting the formation efficiency and purity of metal hydroxide precipitates.

[0004] As can be seen, the above-mentioned defects, when combined, not only greatly reduce the impurity removal effect and leave residues in the discharge, but also continuously undermine the stability of the neutralization reaction, fundamentally reducing the overall efficiency and quality of pickling waste liquid treatment. Furthermore, the caking of impurities can pose a hidden danger to the continuous operation of the equipment, making it difficult to achieve efficient and stable completion of waste liquid impurity removal and neutralization precipitation.

[0005] Therefore, this invention proposes a steel pickling solution waste liquid recycling and treatment device to make up for and improve the shortcomings of the prior art. Summary of the Invention

[0006] In view of the deficiencies of the existing technology, the present invention provides a thickness measuring device for acid-resistant low-carbon seamless steel pipes, which can effectively solve the related technical problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a steel pickling solution waste liquid recycling and treatment device, including a recycling cylinder, and a driving mechanism is installed on the top of the recycling cylinder. The recycling cylinder is characterized in that it is composed of an inner cylinder and an outer cylinder, with a sandwich space between them for accommodating insulation material. It also includes a mixing and recycling mechanism located inside the inner cylinder; The mixing and recycling mechanism includes a premixing component, which divides the inner cylinder into an upper premixing area and a lower mixing reaction area. It includes a waste liquid inlet pipe and a neutralizing agent inlet pipe symmetrically assembled on the top of the recycling cylinder. The waste liquid inlet pipe and the neutralizing agent inlet pipe are both arranged at an incline to allow the waste liquid and the neutralizing agent to enter the inner cylinder in a concentrated spray manner during high-speed output, forming a high-speed turbulent premixing. Below the drive mechanism is a stirring magnetic guide assembly, which is located in the mixing reaction area inside the inner cylinder. It includes a hollow stirring shaft and a strong magnetic core block. The strong magnetic core block is slidably assembled inside the hollow stirring shaft and is driven by the external drive mechanism to lift and lower, thereby cyclically enhancing the magnetic field strength of the mixing reaction area inside the inner cylinder. Combined with the centrifugal force generated by stirring, it further guides metal impurities to the side wall of the recovery cylinder to accumulate. A stepped magnetic attraction assembly is provided between the inner cylinder and the outer cylinder. It includes a magnetic attraction unit, which is composed of at least two magnetic attraction blocks. The magnetic attraction blocks are arranged at equal intervals with increasing magnetic field strength from top to bottom. This assembly is used to work with the stirring magnetic attraction assembly to stably adsorb metal impurities onto the inner wall of the recovery cylinder.

[0008] Compared with the known prior art, the technical solution provided by this invention has at least one of the following beneficial effects: This steel pickling waste liquid recycling and treatment device integrates a premixing component, a stirring and magnetic attraction component, and a stepped magnetic attraction component into a mixing and recycling mechanism. The premixing component achieves high-speed turbulent premixing through an inclined, opposite-spraying waste liquid inlet pipe and a neutralizing agent inlet pipe. The stirring and magnetic attraction component enhances the magnetic field strength through a hollow stirring shaft that links and lifts a strong magnetic core block. The stepped magnetic attraction component forms a graded adsorption using magnetic blocks that increase in gradient from top to bottom. This device solves the problems of insufficient mixing reaction, low metal impurity separation efficiency, and easy residue that affect the treatment effect in existing pickling waste liquid treatment devices. It achieves efficient premixing of pickling waste liquid, effective guidance and stable adsorption of metal impurities, significantly improving the thoroughness of waste liquid treatment and the resource recovery efficiency of metal impurities, and is suitable for industrial continuous processing applications.

[0009] By designing a differentiated length for the waste liquid inlet pipe, which is shorter than that for the neutralizing agent inlet pipe, a discharge position layout is formed that adapts to the conveying volume of both. The short waste liquid inlet pipe design allows a large flow of waste liquid to form a diffusion flow field after being sprayed out, avoiding local liquid accumulation. The long neutralizing agent inlet pipe design allows a small amount of neutralizing agent to be sprayed into the core area of ​​the waste liquid diffusion flow field. This solves the problem of uneven mixing and local concentration imbalance caused by the difference in flow rate between waste liquid and neutralizing agent in the existing premixing structure. It achieves sufficient preliminary mixing of the two before impacting the guide cone seat, laying the foundation for subsequent multi-stage premixing.

[0010] By using guide plates evenly arranged on the cone surface of the guide cone seat and adapted to the cone surface curvature, and in conjunction with the guide cone seat that rotates synchronously with the stirring shaft, the mixture of waste liquid and neutralizing agent is guided to the surrounding area along the cone surface. This solves the problems of chaotic liquid flow, poor swirling effect, and insufficient mixing after the mixture impacts. It realizes the radial diffusion of the mixture and the formation of strong turbulence and initial swirling, further enhancing the swirling effect in the premixing zone.

[0011] By using spiral stirring blades with increasing size from top to bottom, combined with the rotation of the hollow stirring shaft, a centrifugal force field with a stronger force at the bottom and a weaker force at the top is formed inside the cylinder. The large-sized blades at the bottom generate stronger radial thrust, which can efficiently drive high-density metal impurities to migrate to the lower side of the cylinder wall, while the small-sized blades at the top can stably maintain the circulation of the liquid in the upper part, preventing the settled impurities from being resuspended. This solves the problems of uneven centrifugal force distribution, incomplete impurity separation, and easy secondary suspension caused by the uniform size of traditional stirring blades. It realizes the directional guidance and efficient sedimentation of metal impurities, laying a good foundation for the adsorption and separation of subsequent stepped magnetic adsorption components.

[0012] By moving the strong magnetic core block up and down inside the hollow stirring shaft, this structure can flexibly adjust the magnetic field strength distribution in the mixing reaction area without an additional power source. This solves the problem that the magnetic field strength of the traditional magnetic attraction structure is fixed and cannot adapt to the different working conditions of reaction and slag discharge. During the reaction, the strong magnetic core block moves down to enhance the adsorption effect, and moves up to demagnetize during slag discharge, which facilitates the release and discharge of impurities. This greatly improves the ease of operation of the device and the flexibility of impurity separation.

[0013] By using adsorption blades fixed to the upper part of the hollow stirring shaft and positioned above the liquid surface in the mixing reaction zone, a pressure difference is created between the upper and lower surfaces of the blades as the shaft rotates synchronously, generating a negative pressure zone. Combined with the upward flow of the hot gas generated by the reaction between the pickling waste liquid and the neutralizing agent, the generated gases such as carbon dioxide and volatile acid mist can be quickly drawn and collected to the connecting cover position, and then discharged through the side exhaust outlet. This solves the problem of increased internal pressure and unstable reaction caused by the inability to discharge reaction gases and hot gas in a timely manner, achieving efficient collection and discharge of waste gas.

[0014] The sliding baffle can slide vertically along the inside of the sandwich shell, switching between overlapping and offset states with the magnetic suction unit. During the reaction, the sliding baffle is offset from the magnetic suction unit, and the strong magnetic field generated by the magnetic suction unit penetrates the inner cylinder and acts on the reaction area. Combined with the centrifugal force field formed by the stirring blades (strong at the bottom and weak at the top), high-density metal impurities migrate to the cylinder wall and are adsorbed, solving the problem that traditional magnetic suction structures cannot stably adsorb and migrate impurities and that impurity separation is incomplete. Attached Figure Description

[0015] Figure 1 This is a front-view perspective structural diagram of the present invention; Figure 2 This is an axial three-dimensional structural view of the interior of the recovery cylinder in this invention; Figure 3 This is a frontal plan view of the internal structure of the recovery cylinder in this invention; Figure 4 This is a top-view perspective view of the premixed component in this invention. Figure 5 This is a planar structural diagram of the internal structure of the connecting cover in this invention; Figure 6 This is a partial three-dimensional structural diagram of the relevant components of the stirring magnetic guide assembly in this invention; Figure 7 This is a partial three-dimensional structural diagram of the relevant components inside the hollow stirring shaft in this invention; Figure 8 This is a partially exploded three-dimensional structural diagram of the relevant components of the stirring magnetic traction assembly in this invention; Figure 9 This is a three-dimensional structural diagram of the relevant components of the stepped magnetic attraction assembly in this invention; Figure 10This is a three-dimensional structural diagram of the stepped magnetic suction component in use according to the present invention; Figure 11 This is a partially exploded three-dimensional structural diagram of the relevant components of the stepped magnetic attraction assembly in this invention.

[0016] The numbers on the map are: 1. Recycling cylinder; 11. Inner cylinder; 12. Outer cylinder; 2. Drive mechanism; 21. Drive motor; 22. Speed ​​transmission component; 3. Mixed recycling facilities; 31. Premixing component; 311. Waste liquid inlet pipe; 312. Neutralizing agent inlet pipe; 313. Flow guide cone; 314. Flow guide ramp; 315. Connecting cover; 32. Stirring magnetic traction assembly; 321. Hollow stirring shaft; 322. Stirring blade; 323. Adsorption blade; 324. Bidirectional threaded shaft; 325. Nut collar; 326. Limiting rod; 327. Strong magnetic core block; 33. Stepped magnetic attraction assembly; 331. Sandwich shell; 332. Magnetic attraction unit; 333. Sliding baffle. Detailed Implementation

[0017] The present invention will be further described below with reference to embodiments.

[0018] Example 1: like Figures 1 to 7 as well as Figure 9 As shown, a steel pickling waste liquid recycling and treatment device includes a recycling cylinder 1, with a drive mechanism 2 mounted on top of the recycling cylinder 1. The recycling cylinder 1 is composed of an inner cylinder 11 and an outer cylinder 12, forming a sandwich space between them for accommodating insulation material. Specifically, the insulation material can be one or more of rock wool, glass wool, polyurethane foam, and aluminum silicate fiber wool, which are suitable for the installation requirements of the sandwich space of the recycling cylinder 1 and all have excellent thermal insulation performance and corrosion resistance, and can be stably adapted to the temperature environment during the pickling waste liquid reaction process for a long time. Further implementation also includes a mixing and recycling mechanism 3 located inside the inner cylinder 11; The mixing and recycling mechanism 3 includes a premixing component 31, which divides the interior of the inner cylinder 11 into an upper premixing area and a lower mixing reaction area. It includes a waste liquid inlet pipe 311 and a neutralizing agent inlet pipe 312 symmetrically assembled on the top of the recycling cylinder 1. Both the waste liquid inlet pipe 311 and the neutralizing agent inlet pipe 312 are arranged at an inclination to allow the waste liquid and the neutralizing agent to enter the interior of the inner cylinder 11 in a concentrated spray manner during high-speed output, forming a high-speed turbulent premixing. Below the drive mechanism 2, there is a stirring magnetic guide assembly 32. The stirring magnetic guide assembly 32 is located in the mixing reaction area inside the inner cylinder 11. It includes a hollow stirring shaft 321 and a strong magnetic core block 327. The strong magnetic core block 327 is slidably assembled inside the hollow stirring shaft 321 and is driven by the external drive mechanism 2 to lift and lower, thereby cyclically enhancing the magnetic field strength of the mixing reaction area of ​​the inner cylinder 11. Combined with the centrifugal force generated by stirring, it further guides metal impurities to the side wall of the recovery cylinder 1 for accumulation. A stepped magnetic attraction assembly 33 is provided between the inner cylinder 11 and the outer cylinder 12. It includes a magnetic attraction unit 332. The magnetic attraction unit 332 is composed of at least two magnetic attraction blocks. The magnetic field strength of each magnetic attraction block increases from top to bottom and is arranged at equal intervals. It is used to cooperate with the stirring magnetic attraction assembly 32 to stably adsorb metal impurities onto the inner wall of the recovery cylinder 1.

[0019] It should be noted that the drive mechanism 2 includes a drive motor 21 and a speed changer 22. The output end of the drive motor 21 is connected to the input end of the speed changer 22. The output end of the speed changer 22 is fixedly connected to the hollow stirring shaft 321 of the stirring magnetic traction assembly 32, which is used to adjust the stirring speed to adapt to different working conditions.

[0020] Specifically, the driving mechanism 2 provides power for the entire mixing reaction process: the high-speed rotational motion output by the drive motor 21 is transmitted to the hollow stirring shaft 321 after the torque and speed are matched and adjusted by the speed change component 22, which drives the stirring magnetic traction assembly 32 to rotate synchronously. The stirring speed can be flexibly adjusted by the speed change component 22. When the waste liquid concentration is high and the impurity content is large, the speed can be increased to enhance the mixing and centrifugation effect. In the later stage of the reaction, the speed can be reduced to facilitate sludge settling, so as to ensure reaction efficiency and product quality under different working conditions.

[0021] like Figures 2 to 5 As shown, the premixing component 31 includes a guide cone seat 313, which is fixedly connected to the outer wall of the output end of the drive motor 21. Several guide inclined plates 314 are uniformly fixedly connected on its cone surface. The distribution trajectory of each guide inclined plate 314 is adapted to the arc of the cone surface of the guide cone seat 313, which is used to guide the mixture of waste liquid and neutralizing agent to the surrounding area and enhance the swirling effect of the premixing area. A connecting cover 315 is fixedly connected to the bottom of the guide cone seat 313. The top opening size of the connecting cover 315 is adapted to the bottom outer diameter of the guide cone seat 313. Its top outer edge is integrally set with the bottom outer edge of the connecting cover 315, thereby forming an annular liquid flow channel between it and the inner wall of the inner cylinder 11, which is used to guide the mixture of waste liquid and neutralizing agent to the surrounding area and enhance the swirling effect of the premixing area.

[0022] Specifically, the premixing component 31 serves to achieve efficient premixing of the waste liquid and neutralizing agent: after the waste liquid and neutralizing agent are sprayed from the feed pipe, they first impact the guide cone seat 313, which rotates synchronously with the stirring shaft. Guided by the guide inclined plate 314, they diffuse radially outwards along the cone surface, forming strong turbulence and initial swirling flow. Subsequently, the mixture enters the annular liquid flow channel connecting the casing 315 and the inner cylinder 11, where it is further mixed evenly under the action of swirling flow before smoothly entering the mixing reaction zone below. This structure, through a multi-stage mixing mechanism of "impact-guide-swirling flow," significantly improves the premixing uniformity, avoids local over-alkaliness or over-acidity, lays a good foundation for subsequent reactions and impurity removal, and also reduces liquid splashing and energy loss.

[0023] It should be added that, such as Figure 3 As shown, the length of the waste liquid inlet pipe 311 is shorter than the length of the neutralizing agent inlet pipe 312, forming a differentiated outlet position layout to suit the conveying volume and mixing requirements of both: Since the conveying volume of pickling waste liquid is relatively large, the waste liquid inlet pipe 311 is set as a short pipe, so that its outlet is far from the guide cone seat 313, which allows the large flow of waste liquid to form a diffusion flow field after being sprayed out, avoiding local liquid accumulation; while the amount of neutralizing agent added is relatively small, the neutralizing agent inlet pipe 312 is set as a long pipe, so that its outlet is close to the center of the cone surface of the guide cone seat 313, which can achieve the appropriate amount of neutralizing agent added, allowing a small amount of neutralizing agent to directly cut into the core area of ​​the diffusion flow field of the waste liquid, ensuring that the two are initially mixed before impacting the guide cone seat 313.

[0024] like Figure 2 , Figures 5 to 9 As shown, a stirring blade 322 is fixedly connected to the outer wall of the hollow stirring shaft 321. The stirring blade 322 has a spiral structure, and the blade size increases from top to bottom. When the hollow stirring shaft 321 rotates, the rotational motion of the blades forms a composite flow field of axial and radial directions, which in turn forms a centrifugal force field that is stronger at the bottom and weaker at the top, causing high-density metal impurities to migrate towards the lower side of the cylinder wall. An adsorption blade 323 is fixedly connected to the upper part of the hollow stirring shaft 321. The height of the adsorption blade 323 is higher than the liquid level in the mixing reaction area of ​​the recovery cylinder 1. When the adsorption blade 323 rotates, a pressure difference is formed on the upper and lower surfaces of the blade, which draws the gas generated by the reaction toward the connecting cover 315 to facilitate the discharge of waste gas. The hollow stirring shaft 321 has a bidirectional threaded shaft 324 inside. A nut collar 325 is threadedly connected to the outer side of the bidirectional threaded shaft 324. A limit rod 326 is slidably connected to the outer wall of the nut collar 325. The limit rod 326 is slidably connected to the inner wall of the hollow stirring shaft 321. When the bidirectional threaded shaft 324 rotates with the hollow stirring shaft 321, the limit rod 326 restricts the circumferential rotation of the nut collar 325, converting the rotational motion into the linear reciprocating motion of the nut collar 325. A strong magnetic core block 327 is fixedly connected to the outer wall of the nut collar 325. The strong magnetic core block 327 moves up and down synchronously with the nut collar 325. By changing its position in the hollow stirring shaft 321, the magnetic field strength distribution in the mixing reaction zone is adjusted to facilitate subsequent slag discharge.

[0025] It should be added that pickling waste liquid contains a large number of free hydrogen ions and residual acid radicals. When it reacts with neutralizing agents such as alkaline agents, it will rapidly release a large amount of heat and generate carbon dioxide gas. At the same time, the volatile acid mist dissolved in the waste liquid will also escape more rapidly due to the increase in temperature and agitation. The heat released by the reaction will cause these gases to heat up rapidly and form hot gas. Hot gas itself follows the physical principle of upward flow and will spontaneously converge towards the upper area. If these hot gases and reaction gases cannot be discharged in time, it will not only lead to an increase in pressure inside the cylinder and damage the stability of the reaction system, but also cause leakage due to the diffusion of acid mist with the hot gas, which will corrode the equipment structure and threaten the safety of the operating environment.

[0026] Specifically, when the hollow stirring shaft 321 rotates, the spiral stirring blades 322, whose size increases from top to bottom, transform the rotational motion into a composite flow field of axial pushing and radial thrashing, forming a centrifugal force field with a stronger force at the bottom and a weaker force at the top inside the cylinder. The large-sized blades at the bottom generate a stronger radial thrust, causing high-density metallic impurities to migrate to the lower side of the cylinder wall. The small-sized blades at the top maintain the circulation of the liquid in the upper part, preventing the settled impurities from being resuspended. At this time, the adsorption blades 323 located above the liquid surface rotate synchronously with the shaft, forming a pressure difference between the upper and lower surfaces of the blades, creating a negative pressure zone. This draws and collects the acid mist, CO2, and other gases generated by the reaction towards the connecting cover 315, and then discharges them through the exhaust outlet on the side of the connecting cover 315. This not only avoids gas leakage but also improves the efficiency of exhaust gas collection. Furthermore, it can continuously draw, concentrate, and quickly discharge spontaneously rising hot gas and gases during the reaction process.

[0027] like Figure 2 as well as Figures 9 to 11As shown, the stepped magnetic attraction assembly 33 includes a sandwich shell 331, which is fixedly attached between the inner cylinder 11 and the outer cylinder 12. The sandwich shell 331 forms a closed chamber inside to accommodate the magnetic attraction unit 332. A sliding baffle 333 is slidably connected to its top. The sliding baffle 333 can slide vertically along the interior of the sandwich shell 331. When the sliding baffle 333 moves down to its end position, it overlaps with the magnetic attraction unit 332, achieving magnetic shielding of the magnetic attraction function of the magnetic attraction unit 332. When plate 333 moves to the starting position, it is offset from magnetic unit 332. The strong magnetic field generated by magnetic unit 332 can penetrate the inner cylinder 11 and act on the mixing reaction area, so as to perform the magnetic adsorption function normally. Magnetic unit 332 is made of neodymium iron boron permanent magnet material. It is adsorbed and fixed with the metal impurities in the cylinder by strong magnetic field adsorption force. Sliding baffle 333 is made of magnetic shielding material. After it overlaps with magnetic unit 332, it blocks the magnetic adsorption effect of magnetic unit 332 through magnetic shielding.

[0028] Specifically, such as Figure 10 As shown, during the mixing reaction, the sliding baffle 333 is offset from the magnetic unit 332. The strong magnetic field generated by the neodymium iron boron magnetic unit 332 penetrates the inner cylinder 11 and acts on the reaction area. Combined with the centrifugal force field formed by the stirring blade 322 (strong at the bottom and weak at the top), high-density metal impurities migrate towards the cylinder wall and are gradually adsorbed by the magnetic unit 332, whose magnetic field strength increases from top to bottom, and finally guided to the bottom area of ​​the reactor, achieving efficient separation of impurities from the reaction liquid. When the reaction ends and the slag discharge process begins, the sliding baffle 333 slides vertically along the inside of the jacket shell 331 and completely overlaps with the magnetic unit 332. The high-permeability stainless steel sliding baffle 333 blocks the magnetic field of the magnetic unit 332 from being transmitted outward through magnetic shielding, so that the metal impurities adsorbed on the cylinder wall lose their magnetic binding force and are discharged from the slag discharge port along with the bottom sludge, avoiding equipment scaling and reduced processing efficiency caused by impurity residue.

[0029] It should be added that the magnetic unit 332 is composed of at least two magnetic blocks, with the magnetic field strength of each block increasing from top to bottom. The corresponding magnetic field strength can be set to 1500Gs or 3500Gs, which corresponds to the centrifugal force field of the stirring blade 322, which is stronger at the bottom and weaker at the top. During the reaction, metal impurities tend to settle to the bottom of the vessel under the action of gravity and centrifugal force. The lower part of the stirring blade 322 is larger and occupies more concentrated space. When the strong magnetic core block 327 moves with the nut collar 325 to the stirring blade 322, In the lower region, the magnetic field strength is significantly increased, and the horizontal distance between the lower part of the impeller and the inner cylinder 11 is closer, which can more efficiently adsorb metal impurities that migrate with the liquid flow. When the strong magnetic core block 327 moves upward away from the lower region of the stirring impeller 322, the magnetic field in this region weakens and demagnetization is achieved. At this time, the rotational and slinging action of the stirring impeller 322 can more easily guide the metal impurities to the lower part of the cylinder with a higher magnetic field strength, so that the impurities are firmly adsorbed by the stronger magnetic block, which further improves the thoroughness of impurity separation and the smoothness of subsequent slag discharge. The sliding baffle 333 is made of high magnetic permeability stainless steel. When the sliding baffle 333 and the magnetic attraction unit 332 are offset from each other, the magnetic field of the magnetic attraction unit 332 can normally penetrate the inner cylinder 11 and act on the reaction area to maintain the adsorption effect on metal impurities.

[0030] The complete working principle of the above implementation method is as follows: Waste liquid and neutralizing agent enter the premixing zone through waste liquid inlet pipe 311 and neutralizing agent inlet pipe 312, respectively. Since waste liquid inlet pipe 311 is a short pipe, a large flow of waste liquid forms a diffusion flow field after being sprayed out. Neutralizing agent inlet pipe 312 is a long pipe, and a small amount of neutralizing agent is sprayed into the core of the flow field. The two are initially mixed before impacting the guide cone seat 313. The mixed liquid impacts the guide cone seat 313, which rotates synchronously with the stirring shaft, and is guided by the guide inclined plate 314 to diffuse radially along the cone surface, forming strong turbulence and initial swirling flow. Then it enters the annular liquid flow channel connecting the cover 315 and the inner cylinder 11, where it is further mixed evenly under the action of swirling flow, and then smoothly enters the mixing reaction zone below. This stage, through the multi-stage mixing mechanism of "differentiated discharge + impact - guide - swirling flow", greatly improves the premixing uniformity and avoids local over-alkali or over-acidity, laying the foundation for subsequent reactions.

[0031] After the drive motor 21 starts and its speed is adjusted by the speed changer 22, it drives the hollow stirring shaft 321 to rotate. The spiral stirring blades 322, whose size increases from top to bottom, convert the rotational motion into a composite flow field of axial pushing and radial thrashing, forming a centrifugal force field with a stronger force at the bottom and a weaker force at the top inside the cylinder. The larger blades at the bottom generate a stronger radial thrust, causing high-density metallic impurities to migrate to the lower side of the cylinder wall. The smaller blades at the top maintain the circulation of the liquid in the upper part, preventing the settled impurities from being resuspended. At the same time, since the bidirectional threaded shaft 324 and the nut collar 325 form a ball screw transmission structure, and the limiting rod 326 passes through the interior of the hollow stirring shaft 321 and slides with the nut collar 325, when the bidirectional threaded shaft 324 rotates with the hollow stirring shaft 321, the limiting rod 326 restricts the nut collar 325, converting the continuous rotational motion of the bidirectional threaded shaft 324 into the reciprocating motion of the nut collar 325 along the axis of the hollow stirring shaft 321. Specifically, the linear movement involves the bidirectional threaded shaft 324 continuously rotating in one direction. The threaded engagement drives the nut collar 325 to move axially downwards, causing the strong magnetic core block 327 to move down to the lower region of the stirring blade 322, thus enhancing the magnetic field strength in that region. When the strong magnetic core block 327 reaches its lowest point, the threaded engagement continues to drive the nut collar 325 to move axially upwards, causing the strong magnetic core block 327 to move upwards away from that region, weakening the magnetic field and achieving demagnetization. Therefore, as the strong magnetic core block 327 moves with the nut collar 325 to the lower region of the stirring blade 322, the magnetic field strength in that region is significantly increased, and the horizontal distance between the lower part of the blade and the inner cylinder 11 is closer, allowing for efficient adsorption of metal impurities migrating with the liquid flow. When the strong magnetic core block 327 moves upwards away from that region, the magnetic field weakens, achieving demagnetization. The rotational and swaying action of the stirring blade 322 more easily guides the metal impurities to the lower part of the cylinder with a higher magnetic field strength, allowing the impurities to be firmly adsorbed by the stronger magnetic blocks.

[0032] When the pickling waste liquid reacts with the neutralizing agent, it releases a large amount of heat and generates carbon dioxide gas. At the same time, the volatile acid mist is accelerated to escape due to the increase in temperature and the agitation. The hot gas formed spontaneously converges to the top of the cylinder following the principle of upward flow. The adsorption blades 323 located above the liquid surface rotate synchronously with the shaft, forming a pressure difference between the upper and lower surfaces of the blades, creating a negative pressure zone. This draws the acid mist, CO2 and other gases generated by the reaction to the connecting cover 315 and then discharges them through the side exhaust outlet. This stage effectively avoids gas leakage and pressure rise inside the cylinder, ensuring the safety and controllability of the reaction and the cleanliness of the operating environment.

[0033] When the reaction is complete and the slag discharge process begins, such as Figure 2 and Figure 3As shown, the device first opens the supernatant outlet on the side of the recovery cylinder 1 to smoothly discharge the clarified upper layer of treated liquid after the mixing reaction, completing the recovery of liquid products and freeing up sufficient space for subsequent slag discharge operations; then, it opens the slag discharge port at the bottom of the recovery cylinder 1, and with the thrust generated by the low-speed rotation of the stirring blade 322, the sludge settled at the bottom of the vessel is discharged first, completing the initial slag discharge; after the sludge is initially discharged, the sliding baffle 333 slides vertically along the inside of the jacket shell 331, completely aligning with the magnetic attraction unit 332. The high-permeability stainless steel sliding baffle 333 immediately performs a magnetic shielding function, blocking the magnetic field of the magnetic attraction unit 332 from being transmitted to the inner cylinder 11, so that the metal impurities previously adsorbed on the inner wall of the inner cylinder 11 completely lose their magnetic force. The magnetic core 327 moves upward to the area below the stirring blade 322, where the magnetic field weakens. The continuous rotation of the stirring blade 322 causes a swaying and pushing action, guiding all the metal impurities that have fallen off the cylinder wall and remain on the blades to the bottom of the vessel. At this point, the released metal impurities can be discharged directly through the bottom slag discharge port, or an aqueous solution can be introduced into the cylinder through the top feed pipe for rinsing. The flushing action of the water flow cleans the trace amounts of residual impurities on the cylinder wall and blades. The rinsing liquid carries all the metal impurities and is discharged from the bottom slag discharge port. This step-by-step operation process achieves the complete release and efficient discharge of impurities, fundamentally avoiding the scaling problem caused by residual metal impurities, and ensuring the long-term processing efficiency and stability of the device.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel pickling solution waste liquid recycling and treatment device, comprising a recycling cylinder (1), wherein a driving mechanism (2) is mounted on the top of the recycling cylinder (1), characterized in that, The recycling cylinder (1) is composed of an inner cylinder (11) and an outer cylinder (12), with a sandwich space between them for accommodating insulation materials; It also includes a mixing and recycling mechanism (3) located inside the inner cylinder (11). The mixing and recycling mechanism (3) includes a premixing component (31), which divides the interior of the inner cylinder (11) into an upper premixing area and a lower mixing reaction area. It includes a waste liquid inlet pipe (311) and a neutralizer inlet pipe (312) symmetrically mounted on the top of the recycling cylinder (1). The waste liquid inlet pipe (311) and the neutralizer inlet pipe (312) are both arranged at an inclination to allow the waste liquid and the neutralizer to enter the interior of the inner cylinder (11) in a concentrated spray manner when outputting at high speed, forming a high-speed turbulent premixing. Below the drive mechanism (2) is a stirring magnetic guide assembly (32). The stirring magnetic guide assembly (32) is located in the mixing reaction area inside the inner cylinder (11). It includes a hollow stirring shaft (321) and a strong magnetic core block (327). The strong magnetic core block (327) is slidably assembled inside the hollow stirring shaft (321) and is driven by the external drive mechanism (2) to lift and lower, thereby cyclically enhancing the magnetic field strength of the mixing reaction area of ​​the inner cylinder (11). Combined with the centrifugal force generated by stirring, it further guides the metal impurities to the side wall of the recovery cylinder (1) for accumulation. A stepped magnetic attraction assembly (33) is provided between the inner cylinder (11) and the outer cylinder (12), which includes a magnetic attraction unit (332). The magnetic attraction unit (332) is composed of at least two magnetic attraction blocks, and the magnetic field strength of each magnetic attraction block increases from top to bottom and is arranged at equal intervals. It is used to cooperate with the stirring magnetic attraction assembly (32) to stably adsorb metal impurities onto the inner wall of the recovery cylinder (1).

2. The steel pickling solution waste liquid recycling and treatment device according to claim 1, characterized in that, The drive mechanism (2) includes a drive motor (21) and a speed changer (22). The output end of the drive motor (21) is connected to the input end of the speed changer (22). The output end of the speed changer (22) is fixedly connected to the hollow stirring shaft (321) of the stirring magnetic traction assembly (32) to adjust the stirring speed.

3. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, The premixing component (31) includes a guide cone seat (313), which is fixedly connected to the outer wall of the output end of the drive motor (21), and several guide inclined plates (314) are uniformly fixedly connected on its cone surface. The distribution trajectory of each guide inclined plate (314) is adapted to the taper of the guide cone seat (313) to guide the mixture of waste liquid and neutralizing agent to the surrounding area and enhance the swirling effect of the premixing area.

4. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, A connecting cover (315) is fixedly connected to the bottom of the flow guide cone (313). The top opening size of the connecting cover (315) is adapted to the bottom outer diameter of the flow guide cone (313). Its top outer edge is integrally set with the bottom outer edge of the connecting cover (315), thereby forming an annular liquid flow channel between it and the inner wall of the inner cylinder (11) to guide the mixture of waste liquid and neutralizing agent to the surrounding area and enhance the swirling effect of the premixed area.

5. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, The outer wall of the hollow stirring shaft (321) is fixedly connected with stirring blades (322). The stirring blades (322) have a spiral structure and the blade size increases from top to bottom. As the hollow stirring shaft (321) rotates, the rotational motion of the blades forms a composite flow field of axial and radial directions.

6. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, The upper part of the hollow stirring shaft (321) is fixedly connected to an adsorption blade (323). The height of the adsorption blade (323) is higher than the liquid level in the mixing reaction area of ​​the recovery cylinder (1). When the adsorption blade (323) rotates, a pressure difference is formed on the upper and lower surfaces of the blade, which draws the gas generated by the reaction to the connecting cover (315) to facilitate the discharge of waste gas.

7. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, The hollow stirring shaft (321) is provided with a bidirectional threaded shaft (324) inside. The outer side of the bidirectional threaded shaft (324) is threaded with a nut collar (325). The outer wall of the nut collar (325) is slidably connected to a limit rod (326). The limit rod (326) is slidably connected to the inner wall of the hollow stirring shaft (321). When the bidirectional threaded shaft (324) rotates with the hollow stirring shaft (321), the limit rod (326) restricts the circumferential rotation of the nut collar (325), converting the rotational motion into the linear reciprocating motion of the nut collar (325).

8. The steel pickling solution waste liquid recovery and treatment device according to claim 7, characterized in that, A strong magnetic core block (327) is fixedly connected to the outer wall of the nut collar (325). The strong magnetic core block (327) moves up and down synchronously with the nut collar (325). By changing its position in the hollow stirring shaft (321), the magnetic field strength distribution in the mixing reaction area is adjusted, which facilitates subsequent slag discharge.

9. The steel pickling solution waste liquid recovery and treatment device according to claim 1, characterized in that, The stepped magnetic attraction component (33) includes a sandwich shell (331), which is fixedly attached between the inner cylinder (11) and the outer cylinder (12). The interior of the sandwich shell (331) forms a closed chamber for accommodating the magnetic attraction unit (332). A sliding baffle (333) is slidably connected to the top of the sandwich shell (331). The sliding baffle (333) can slide vertically along the interior of the sandwich shell (331). When the sliding baffle (333) moves down to the end position, it overlaps with the magnetic attraction unit (332) to achieve magnetic shielding of the magnetic attraction function of the magnetic attraction unit (332). When the sliding baffle (333) moves up to the beginning position, it is offset from the magnetic attraction unit (332). The strong magnetic field generated by the magnetic attraction unit (332) can penetrate the inner cylinder (11) and act on the mixing reaction area to perform the magnetic attraction function normally.

10. The steel pickling solution waste liquid recycling and treatment device according to claim 1, characterized in that, The magnetic unit (332) is made of neodymium iron boron permanent magnet material. It is attracted and fixed to the metal impurities in the cylinder by strong magnetic field attraction. The sliding baffle (333) is made of magnetic shielding material. After it overlaps with the magnetic unit (332), it blocks the magnetic attraction of the magnetic unit (332) through magnetic shielding.

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