Low-acid-consumption solid solution treatment device for stainless steel production

Abstract

The present application relates to a kind of low acid consumption solid solution treatment device for stainless steel production, belong to waste liquid treatment technical field.The device includes temporary storage tank, concentration tank body, water pump II, annular pipe I, flow guide mechanism and detection mechanism.Concentration tank body is divided into concentration cavity I and temporary storage cavity I by partition plate;Water pump II pumps pickling liquor into concentration cavity I by spraying pipe;Annular pipe I sprays hot air to pickling liquor by hot air jet I;Flow guide mechanism makes pickling liquor slowly overflow and prolongs flow path by flanging structure and flow resistance ball, increases contact time with hot air;Detection mechanism detects acid concentration in real time by online refractometer detection device in detection box, qualified acid liquor is discharged to calcination furnace, unqualified acid liquor is returned to temporary storage cavity I and re-concentrated.The present application prolongs heat exchange time by layered heating and flow guide, improves concentration efficiency, and realizes real-time detection and automatic reflux cycle of acid concentration, effectively reduces acid consumption, improves acid utilization.

Description

Technical Field

[0001] This invention belongs to the field of waste liquid treatment technology and relates to a low acid consumption solid solution treatment device for stainless steel production. Background Technology

[0002] In stainless steel production, the pickling solution produced in the pickling process needs to be concentrated to increase its concentration in order to meet the process requirements of recycling or subsequent roasting. The accurate detection of the concentration of the concentrated acid solution directly determines whether the acid solution is suitable for subsequent processes. Both factors affect the acid consumption cost and process stability of stainless steel production. Although there are applications of pickling solution concentration and concentration detection technologies in the industry, there are still significant technical pain points that make it difficult to meet the needs of efficient and low-consumption production.

[0003] Existing acid concentration devices mostly use a single heating structure (such as a single set of hot air nozzles directly spraying acid). The acid often comes into contact with the hot air in a rapid spray form. The contact time between the two is short and the heat exchange area is limited, resulting in insufficient heat exchange and low concentration efficiency.

[0004] Existing detection methods mostly involve offline sampling and analysis, requiring manual extraction and concentration of acid solution before it is sent to the laboratory for testing. Another method involves directly installing an online refractometer on the delivery pipeline. While this method can achieve detection, the results are significantly delayed. If the acid concentration is not up to standard, the substandard acid solution has already entered the subsequent roasting or discharge stages, resulting in a waste of acid resources and potentially affecting the roasting effect due to insufficient concentration.

[0005] Therefore, we propose a low-acid-consumption solution treatment device for stainless steel production to solve the problems mentioned above. Summary of the Invention

[0006] In view of this, in order to solve the above problems, the present invention provides a low-acid-consumption solution treatment apparatus for stainless steel production.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-acid-consumption solution treatment apparatus for stainless steel production, comprising:

[0008] A temporary storage box, located at the bottom of the pickling unit, is used to receive pickling solution;

[0009] A concentration tank is located on one side of the pickling unit. A partition plate is fixedly installed inside the concentration tank, which divides the concentration tank into a concentration chamber I and a temporary storage chamber I.

[0010] Water pump II is located on one side of the pickling unit. The water inlet end of water pump II is connected to a main water inlet pipe, which is in the shape of a T-junction. The other two ends are connected to temporary storage chamber I and temporary storage tank respectively, and are equipped with valves. The water outlet end of water pump II is connected to a spray pipe, and the top end of the spray pipe extends into the concentration chamber I.

[0011] An annular pipe I is fixedly installed on the outer wall of the concentration tank. Multiple hot air nozzles I are fixedly installed through the outer wall of the concentration tank. One end of each hot air nozzle I is connected to the annular pipe I. The annular pipe I is connected to a hot air source through a connecting pipe I, and the other end of each hot air nozzle I faces the top of the spray pipe.

[0012] A flow guiding mechanism is installed on the concentration tank and located inside concentration chamber I. It is used to guide the falling pickling solution to increase the contact time between the pickling solution and the hot air.

[0013] The detection mechanism is located on the outer wall of the concentration tank. The detection mechanism includes a detection box for receiving the pickling solution falling from the concentration chamber I. The detection box is equipped with an online refractive index detection device for detecting the concentration of the pickling solution. It also includes a drainage component for discharging qualified pickling solution into the roasting furnace and unqualified pickling solution into the temporary storage chamber I.

[0014] The pickling solution is discharged from the top of the spray pipe, guided by the flow guiding mechanism to extend the contact time with the hot air, and concentrated. The concentration is then tested by the testing agency. Qualified pickling solution is discharged to the roasting furnace, while unqualified pickling solution is returned to the temporary storage chamber I and re-pumped back to the concentration chamber I by water pump II for circulation and concentration.

[0015] As a further improvement to the above technical solution:

[0016] The detection chambers are multiple and are all installed on the outer wall of the concentration tank. The multiple detection chambers are divided into two groups for alternating use. The detection chambers are connected to the concentration chamber I through connecting pipe I to receive the falling pickling solution. The connecting pipe I is equipped with an electromagnetic valve.

[0017] The partition plate is conical, and the connecting pipe I is located at the bottom end of the partition plate.

[0018] The drain assembly includes multiple connecting pipes II that are fixedly installed through the outer wall of the concentration tank. One end of each connecting pipe II is connected to the temporary storage chamber I, and the other end of each connecting pipe II is connected to the bottom of the detection box. Each connecting pipe II is equipped with a solenoid valve.

[0019] The outer wall of the concentration tank is fixedly provided with an annular pipe II, and the top end of the annular pipe II is connected to a plurality of connecting pipes III. The top end of the connecting pipes III is connected to the bottom of the detection box, and an electromagnetic valve is provided on the connecting pipes III.

[0020] The annular pipe II is connected to the spray pipe inside the roasting furnace via connecting pipe II.

[0021] The flow guiding mechanism includes a flanged structure, which is formed by flanged top of the spray pipe. A flow-blocking ball is provided at the top of the flanged structure. A telescopic support rod is fixedly provided on the top wall of the concentration tank. The bottom end of the telescopic support rod abuts against the outer wall of the flow-blocking ball. The flow-blocking ball blocks the top of the spray pipe to control the pickling liquid to overflow slowly, and the flow is guided by the flanged structure to extend the heat exchange time.

[0022] The outer wall of the flange structure is fixedly provided with multiple connecting rods, and the bottom of the multiple connecting rods is fixedly provided with the same flow guide rib. The flow guide rib is used to collect the pickling liquid flowing down the wall of the concentration tank to further extend the flow path.

[0023] The top of the flow guide rib has multiple stepped structures. The flow guide rib is hollow. Multiple hot air nozzles II are connected to one side of the stepped structure. The flow guide rib is connected to the annular pipe I through a pipe, so that hot air is sprayed out through the hot air nozzles II to assist in heating the pickling solution.

[0024] It also includes a cleaning mechanism, which includes a support base fixedly installed on one side of the pickling unit. A conveyor unit is provided on the support base. A collection hopper is connected to the top of one side of the temporary storage box. One side of the collection hopper extends to the bottom of the conveyor unit. Multiple scraper plates are fixedly installed on the conveyor belt of the conveyor unit to scrape the impurities on the filter screen plate outward.

[0025] A water pump I is fixedly installed on the support base, and a spray coil is fixedly installed on one side of the conveyor unit. The water inlet of the water pump I is connected to the temporary storage tank through a pipe, and the water outlet of the water pump I is connected to the spray coil through a pipe. Impurities are washed away and acid is recovered to the temporary storage tank through the spray coil.

[0026] The telescopic support rod includes a sleeve rod fixedly installed on the top wall of the concentration tank. A sliding rod is slidably provided at the bottom end of the sleeve rod. An elastic element is provided inside the sleeve rod. The two ends of the elastic element abut against the top end of the sliding rod and the top wall of the sleeve rod respectively through spring seats. A positioning groove adapted to the flow-blocking ball is opened at the bottom of the sliding rod. The elastic element provides pressure to make the flow-blocking ball stably cover the top end of the spray pipe.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The present invention discloses a low-acid-consumption solution treatment device for stainless steel production. By installing a detachable filter screen plate in the collection hopper, it can effectively intercept impurities such as oxide scale debris and metal particles in the pickling solution, avoiding impurities from clogging the subsequent concentration pipeline or affecting the concentration purity of the acid solution. This solves the problem of frequent equipment failures caused by impurity accumulation in traditional devices. At the same time, the cleaning mechanism automatically cleans the impurities on the filter screen plate by driving the scraper plate through the conveyor unit, eliminating the need for frequent manual disassembly and cleaning, and greatly reducing manpower input. With the help of the spray coil to rinse the conveyor unit and scraper plate, it can not only clean the residual acid and impurities on the surface of the parts, but also guide the rinsed acid solution back to the temporary storage tank for recycling, avoiding the waste of acid solution due to adhering to impurities or parts, effectively improving the acid solution recovery rate and directly reducing acid consumption.

[0029] 2. The low-acid-consumption solution treatment device for stainless steel production disclosed in this invention solves the problems of insufficient heat exchange and low concentration efficiency of traditional concentration devices by combining layered heating and precise flow guidance: Hot air nozzle I initially heats and concentrates the acid solution sprayed from the spray pipe; the flow guidance mechanism controls the slow overflow of acid solution through a flanged structure and flow-blocking ball, extending the contact time between acid solution and hot air; the stepped structure of the flow guidance ribs further slows down the flow speed of acid solution, and together with the heating of hot air nozzle II, a concentration system is formed, which significantly improves the concentration efficiency of acid solution and accelerates the speed at which the acid solution reaches the standard concentration; at the same time, the concentration process utilizes the existing hot air source in the factory, eliminating the need for additional heating equipment and reducing energy consumption; unqualified acid solution can be returned to temporary storage chamber I for re-concentration, avoiding the waste of acid consumption caused by direct discharge of unqualified acid solution, thus achieving "low-acid-consumption" production;

[0030] 3. The low-acid-consumption solution treatment device for stainless steel production disclosed in this invention employs multiple detection chambers used alternately, along with an online refractive index detection device, to achieve real-time and accurate detection of acid concentration. This solves the problem of unqualified acid entering the subsequent roasting process due to the lag in detection of traditional devices, resulting in a double waste of acid and energy. Through the cooperation of connecting pipe II and temporary storage chamber I, unqualified acid can be automatically returned to temporary storage chamber I and re-pumped by water pump II to concentration chamber I for circulation, avoiding the direct discarding of unqualified acid. Qualified acid is collected through ring pipe II and transported to the roasting furnace, ensuring that every portion of acid is fully utilized, significantly improving the comprehensive utilization rate of acid and reducing resource waste.

[0031] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0033] Figure 1 This is a three-dimensional structural schematic diagram of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0034] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of the low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0035] Figure 3 This is a cross-sectional view of the material collection hopper of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0036] Figure 4 This is a cross-sectional structural diagram of the concentration tank of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0037] Figure 5 This is a schematic diagram of the flow guiding component of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0038] Figure 6 This is a schematic diagram of the installation position of the hot air nozzle II in a low acid consumption solution treatment device for stainless steel production according to the present invention.

[0039] Figure 7 This is a cross-sectional view of the telescopic support rod of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0040] Figure 8 This is a cross-sectional structural diagram of the detection chamber of a low-acid-consumption solution treatment device for stainless steel production according to the present invention.

[0041] Attached reference numerals: 1. Pickling unit; 2. Temporary storage box; 3. Collection hopper; 31. Filter screen plate; 4. Cleaning mechanism; 41. Support base; 42. Conveyor unit; 43. Scraper plate; 44. Spray coil; 45. Water pump I; 5. Concentration tank; 51. Divider plate; 52. Concentration chamber I; 53. Temporary storage chamber I; 54. Exhaust main pipe; 55. Hot air nozzle I; 56. Circular pipe I; 57. Connecting pipe I; 58. Connection pipe I; 59. Detection box; 591. In Linear refraction detection device; 592, Connecting pipe II; 593, Connecting pipe III; 594, Ring pipe II; 595, Connecting pipe II; 6, Water pump II; 61, Main inlet pipe; 62, Spray pipe; 7, Flow guiding mechanism; 71, Flanged structure; 72, Telescopic support rod; 721, Sleeve rod; 722, Elastic element; 723, Sliding rod; 724, Positioning slot; 73, Flow-blocking ball; 74, Connecting support rod; 75, Flow guiding rib; 76, Stepped structure; 77, Hot air nozzle II. Detailed Implementation

[0042] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0044] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0045] Example 1

[0046] like Figures 1-8As shown, a low-acid-consumption solution treatment device for stainless steel production includes a temporary storage tank 2 located at the bottom of the pickling unit 1. The temporary storage tank 2 is used to receive the pickling solution discharged from the pickling unit 1, avoiding waste or pollution caused by direct discharge of the pickling solution. The pickling solution is highly corrosive; the inner wall of the temporary storage tank 2 is made of acid-resistant stainless steel and passivated to extend the equipment's service life. Simultaneously, the bottom of the temporary storage tank 2 is designed with a slightly inclined structure, the inclination direction facing the connection port of the subsequent collection hopper 3, ensuring that the pickling solution in the tank can flow smoothly into the collection hopper 3, reducing residue. One side of the top of the temporary storage tank 2 is connected to the collection hopper 3 via a flange, and an acid-resistant sealing gasket is installed at the flange connection to prevent pickling solution leakage. A filter screen 31 is bolted into the collection hopper 3. The function of the filter screen 31 is to intercept impurities such as oxide scale debris and metal particles in the pickling solution, preventing impurities from entering the subsequent concentration stage, clogging the pipes, or affecting the concentration effect. For ease of maintenance, the filter screen plate 31 is designed to be detachable. When the screen holes become clogged or worn, workers can remove the bolts and replace the screen plate with a new one. Sealing strips are also installed at the edges of the screen plate where they meet the inner wall of the collection hopper 3 to ensure that all pickling solutions are filtered through the screen plate before flowing out. A cleaning mechanism 4 is located at one end of the pickling unit 1 to promptly remove impurities accumulated on the filter screen plate 31, preventing screen clogging and subsequent decrease in filtration efficiency.

[0047] The cleaning mechanism 4 includes a support base 41 fixed to the ground on one side of the pickling unit 1 by expansion bolts. The support base 41 is welded from structural steel and has reinforcing ribs at the bottom to ensure the stability of the overall structure. A conveyor unit 42 is mounted on the support base 41 via bearing seats. The conveyor unit 42 can be a chain conveyor with anti-slip treatment on the surface of the chain plates to prevent impurities from slipping due to pickling liquid. The conveying direction of the conveyor unit 42 is towards the impurity collection area away from the pickling unit 1, and a receiving tray is provided below the conveying path to collect any occasional falling impurities or acid liquid to prevent ground contamination. One side of the collecting hopper 3 extends directly above the conveyor unit 42, allowing impurities filtered by the filter screen 31 to fall naturally onto the chain plates of the conveyor unit 42. Multiple scraper plates 43 are welded and fixed to the chain plates of the conveyor unit 42. The scraper plates 43 are perpendicular to the surface of the chain plates, and the spacing between adjacent scraper plates 43 is set according to the amount of impurities generated to ensure that impurities on the filter screen 31 are scraped clean in a timely manner. During operation, the conveyor unit 42 starts, and the chain plate drives the scraper plate 43 to move in a cycle. When the scraper plate 43 moves below the filter screen plate 31, it scrapes the impurities accumulated on the screen plate upwards, and then conveys them to the impurity collection area with the chain plate. A water pump I 45 is also fixed to the support base 41 by a bracket. The water pump I 45 is an acid-resistant centrifugal pump to avoid corrosion by acid washing solution. A spray coil 44 is fixed to the side of the conveyor unit 42 near the collection hopper 3 by a clamp. The spray coil 44 is arranged along the length of the conveyor unit 42, and multiple spray holes are evenly distributed on the coil, with the spray holes angled downwards towards the chain plate and scraper plate 43 to ensure that the washing range covers the entire conveying area. The water inlet of the water pump I 45 is connected to the temporary storage tank 2 through an acid-resistant pipe, and the drain end is connected to the spray coil 44 through an acid-resistant pipe. When conveyor unit 42 is operating, water pump I 45 starts synchronously, transporting the pickling solution in temporary storage tank 2 to spray coil 44. The solution is sprayed out through spray holes, washing away residual acid and impurities on the chain plate and scraper plate 43 to reduce acid waste. It also performs preliminary cleaning of impurities, removing acid adhering to their surfaces to prevent them from carrying acid and corroding subsequent equipment. The rinsed acid is collected through a receiving tray and then piped back to temporary storage tank 2, further improving the acid recovery rate.

[0048] The concentration tank 5 is fixed to the ground on one side of the pickling unit 1 by a bracket and is the core component for concentrating the pickling solution. The concentration tank 5 is entirely welded from acid-resistant stainless steel, and the wall thickness is determined according to the tank volume and working pressure to ensure that the structural strength meets the usage requirements. Inside the concentration tank 5, a partition plate 51 is welded and fixed, dividing the interior of the concentration tank 5 into two independent chambers: the upper concentration chamber I 52 and the lower temporary storage chamber I 53. The concentration chamber I 52 is used for heating and concentrating the pickling solution, while the temporary storage chamber I 53 is used to temporarily store pickling solution that is not of the required concentration and needs to be re-concentrated. The partition plate 51 is designed with a conical structure, with the tip of the cone pointing upwards. This design allows the concentrated pickling solution to flow smoothly down the conical surface without accumulating on the plate. Reinforcing ribs are welded to the weld between the partition plate 51 and the inner wall of the concentration tank 5 to enhance the connection strength and prevent deformation caused by long-term bearing of the weight of the pickling solution. A water pump II6 is installed on one side of the pickling unit 1 via a shock-absorbing pad. Water pump II6, also an acid-resistant centrifugal pump, serves as the power source for transporting the pickling solution. The inlet of water pump II6 is connected to a main inlet pipe 61 via a T-junction. The other two ports of the main inlet pipe 61 are connected to temporary storage chamber I 53 and temporary storage tank 2 via acid-resistant pipes, respectively. Each connection port is equipped with a solenoid valve, allowing operators to control the valves to either draw fresh pickling solution from temporary storage tank 2 or draw substandard pickling solution from temporary storage chamber I 53 for re-concentration. The outlet of water pump II6 is connected to a spray pipe 62 via an acid-resistant pipe. The spray pipe 62 extends vertically upwards, its top end passing through partition plate 51 and extending into concentration chamber I 52. The top center of the concentration tank 5 is welded with an exhaust manifold 54, which is used to discharge the waste gas generated by the evaporation of pickling solution during the concentration process and to avoid excessive pressure inside the tank. The outlet end of the exhaust manifold 54 is connected to the factory's waste gas treatment system. The waste gas is treated to meet the standards before being discharged, which complies with environmental protection requirements. In addition, the top of the concentration tank 5 is arc-shaped, which helps the pickling solution splashed on the top wall of the concentration tank 5 to flow downward along the wall.

[0049] An annular tube I56 is fixedly fitted onto the outer wall of the concentration tank 5 via a bracket. A certain gap is left between the annular tube I56 and the outer wall of the concentration tank 5 to prevent structural damage caused by thermal expansion and contraction. Multiple hot air nozzles I55 are welded through the side wall of the concentration tank 5. The multiple hot air nozzles I55 are evenly distributed along the circumference of the annular tube I56 to ensure that hot air can be evenly sprayed into the concentration chamber I52. One end of each hot air nozzle I55 is connected to the annular tube I56, and the other end extends into the concentration chamber I52, with the nozzle outlet facing the top of the spray pipe 62. This allows the sprayed hot air to directly envelop the pickling solution spray, forming sufficient heat exchange and accelerating the evaporation of water in the pickling solution. One side of the annular pipe I56 is connected to the connecting pipe I57 via an acid-resistant pipe. The other end of the connecting pipe I57 is connected to the factory's hot air source. The hot air provided by the hot air source enters the annular pipe I56 through the connecting pipe I57, and is then sprayed into the concentration chamber I52 through each hot air nozzle I55 to provide heat for the concentration of pickling solution.

[0050] The concentration chamber I 52 is equipped with a flow guiding mechanism 7, which is used to guide the pickling liquid falling from the top wall of the concentration tank 5, prolonging the residence time of the pickling liquid in the concentration chamber I 52, further increasing the contact opportunity with hot air, and improving the concentration effect. The flow guiding mechanism 7 includes a flanged structure 71, which is formed by directly folding the pipe wall at the top of the spray pipe 62 outward, and is an integral structure with the spray pipe 62 to ensure a firm connection and no risk of leakage. The top of the flanged structure 71 is equipped with a flow-blocking ball 73, which is made of acid-resistant ceramic material with a smooth surface, which can reduce the adhesion of pickling liquid and prevent it from being corroded by pickling liquid. The inner side of the top wall of the concentration tank 5 is fixed with a telescopic support rod 72 by bolts. The bottom end of the telescopic support rod 72 is in close contact with the outer wall of the flow-blocking ball 73, providing stable pressure to the flow-blocking ball 73. This ensures that the flow-blocking ball 73 can tightly cover the nozzle at the top of the spray pipe 62, controlling the pickling liquid to flow out slowly rather than being sprayed directly, thus extending the contact time with the hot air.

[0051] Multiple connecting rods 74 are welded to the outer wall of the flange structure 71. These connecting rods 74 are evenly distributed along the circumference of the flange structure 71 to ensure balanced force. The bottom of all connecting rods 74 is welded to the same guide rib 75. The guide rib 75 is annular, horizontally arranged within the concentration chamber I 52, and located directly above the partition plate 51, precisely to collect the pickling solution flowing down the conical surface of the partition plate 51. Multiple stepped structures 76 are formed on the top surface of the guide rib 75. These stepped structures 76 slow down the flow rate of the pickling solution, allowing it to remain on each step for a period of time, ensuring sufficient contact with the hot air. Simultaneously, the edges of the steps are rounded to prevent the pickling solution from accumulating at corners. The guide rib 75 has a hollow structure inside. One side of it is connected to the annular pipe I 56 through an acid-resistant pipe. Multiple connecting holes are opened through one side wall of the stepped structure 76. A hot air nozzle II 77 is welded to each connecting hole. The outlet of the hot air nozzle II 77 faces the direction of the pickling liquid flow, so that some of the hot air in the annular pipe I 56 can enter the interior of the guide rib 75 and then be sprayed onto the pickling liquid on the guide rib 75 through the hot air nozzle II 77, thereby concentrating the pickling liquid falling along the top wall of the concentration tank 5.

[0052] A detection mechanism is installed on the outer wall of the concentration tank 5 to monitor the concentration of the concentrated pickling solution in real time and to divert the pickling solution based on the detection results. The detection mechanism includes multiple detection chambers 59, all of which are fixed to the outer wall of the concentration tank 5 by brackets and are used in two groups alternately. While one group of detection chambers 59 receives and detects the pickling solution, the other group is in standby mode, ensuring continuous and uninterrupted detection without affecting production efficiency. Each detection chamber 59 has a connecting pipe I 58 connected to its top via an acid-resistant pipe. The other end of the connecting pipe I 58 passes through the side wall of the concentration tank 5 and connects to the concentration chamber I 52. The inlet end of the connecting pipe I 58 is located at the bottom edge of the partition plate 51, just enough to receive the concentrated pickling solution flowing down from the partition plate 51. A solenoid valve is installed on the connecting pipe I 58 to control whether the pickling solution enters the detection chamber 59. The detection chamber 59 houses an online refractive index detection device 591. The detection probe of the online refractive index detection device 591 extends into the detection chamber 59, directly contacting the pickling solution to detect its concentration in real time and transmit the detection data to the equipment control system. To prevent contamination of the detection probe by impurities, a perforated protective cover is fitted over the probe. The cover intercepts impurities while allowing the pickling solution to contact the probe. The protective cover can be periodically removed and cleaned to ensure detection accuracy.

[0053] The testing facility also includes a drainage assembly for guiding qualified and unqualified pickling solutions to different areas. The drainage assembly includes multiple connecting pipes II592. One end of each connecting pipe II592 passes through the side wall of the concentration tank 5 and connects to the temporary storage chamber I53, while the other end connects to the bottom of the corresponding testing chamber 59. Each connecting pipe II592 is equipped with a solenoid valve to guide unqualified pickling solutions back to the temporary storage chamber I53. An annular pipe II594 is also fixed to the outer wall of the concentration tank 5 via a bracket. The top of the annular pipe II594 is connected to connecting pipes III593 via multiple acid-resistant pipes. The other end of each connecting pipe III593 connects to the bottom of the corresponding testing chamber 59. Each connecting pipe III593 is also equipped with a solenoid valve to guide qualified pickling solutions into the annular pipe II594. One side of the annular pipe II 594 is connected to a connecting pipe II 595, and the other end of the connecting pipe II 595 is connected to a spray pipe inside the roasting furnace. Qualified pickling solution is collected through the annular pipe II 594 and then transported to the roasting furnace for further processing through the connecting pipe II 595. When the online refractive index detection device 591 detects that the concentration of the pickling solution is qualified, the control system opens the solenoid valve on the connecting pipe III 593 and closes the solenoid valve on the connecting pipe II 592. The qualified pickling solution enters the annular pipe II 594 and is transported to the roasting furnace. If the concentration is not qualified, the solenoid valve on the connecting pipe II 592 is opened and the solenoid valve on the connecting pipe III 593 is closed. The unqualified pickling solution flows back to the temporary storage chamber I 53, waiting to be pumped back to the concentration chamber I 52 by the water pump II 6 for re-concentration.

[0054] The telescopic support rod 72 includes a connecting rod 721, which is bolted to the inner side of the top wall of the concentration tank 5. The connecting rod 721 is a hollow tubular structure with a lubricated inner wall to facilitate the sliding of internal components. A sliding rod 723 is slidably inserted into the bottom end of the connecting rod 721, allowing the sliding rod 723 to slide up and down within the connecting rod 721 to achieve the telescopic function. An elastic element 722, a compression spring, is provided inside the connecting rod 721. Its top end abuts against the inner side of the top wall of the connecting rod 721 via a spring seat, and its bottom end abuts against the top end of the sliding rod 723 via a spring seat. The spring force provides downward pressure to the sliding rod 723, ensuring that the bottom end of the sliding rod 723 stably abuts against the flow-blocking ball 73. The bottom of the sliding rod 723 is provided with a positioning slot 724. The shape of the positioning slot 724 is adapted to the shape of the flow-blocking ball 73, which can stably lock the flow-blocking ball 73 at the bottom of the sliding rod 723, preventing the flow-blocking ball 73 from shifting under the impact of the pickling liquid, and ensuring a stable blocking effect on the spray nozzle of the spray pipe 62.

[0055] The working process of this invention is as follows: The pickling liquid generated by the pickling unit 1 flows naturally into the temporary storage tank 2. Part of the pickling liquid in the temporary storage tank 2 enters the collection hopper 3 through a pipe. When the pickling liquid flows through the filter screen plate 31, impurities such as oxide scale debris are filtered out and remain on the filter screen plate 31. The filtered pickling liquid continues to flow downwards and enters the subsequent concentration stage. As filtration proceeds, the impurities on the filter screen plate 31 gradually increase. At this time, the conveyor unit 42 is started. The conveyor unit 42 drives the scraper plate 43 to move, scraping the impurities on the filter screen plate 31 onto the conveyor belt and transporting them to the designated impurity collection area. At the same time, the water pump I 45 is started, transporting the pickling liquid in the temporary storage tank 2 to the spray coil 44. The pickling liquid sprayed from the spray coil 44 washes the impurities on the conveyor belt and the scraper plate 43, recovering the residual acid and reducing waste.

[0056] According to production needs, the corresponding valve on the main water inlet pipe 61 is opened. The pickling solution in the temporary storage tank 2 or temporary storage chamber I 53, under the action of water pump II 6, enters the spray pipe 62 through the main water inlet pipe 61 and is sprayed from the top of the spray pipe 62 into the concentration chamber I 52. At this time, the hot air source is activated, and hot air enters the annular pipe I 56 through the connecting pipe I 57, and then is sprayed into the concentration chamber I 52 through the hot air nozzle I 55, contacting the pickling solution sprayed from the spray pipe 62 and initiating the concentration process. The pickling solution slowly overflows from the top of the spray pipe 62 under the obstruction of the flow-blocking ball 73, flowing downwards along the flanged structure 71. During this flow, it continuously contacts the hot air sprayed from the hot air nozzle I 55, and the moisture continuously evaporates.

[0057] The pickling solution on the flanged structure 71 flows to the bottom and falls onto the partition plate 51, while the pickling solution on the inner wall of the concentration tank 5 flows onto the guide ribs 75. The stepped structure 76 on the guide ribs 75 slows down the flow rate of the pickling solution. At the same time, hot air from the annular pipe I 56 enters the guide ribs 75 and is sprayed onto the pickling solution through the hot air nozzle II 77 to concentrate the pickling solution. The concentrated pickling solution flows down from the guide ribs 75, falls onto the partition plate 51, and enters the detection chamber 59 through the connecting pipe I 58. All the solenoid valves on the connecting pipes II 592 and III 593 are closed. When the pickling solution in the detection chamber 59 reaches a certain amount, the valve on the connecting pipe I 58 is closed, and the valves on another set of connecting pipes I 58 are opened to continue receiving the concentrated pickling solution.

[0058] The online refractive index detection device 591 detects the concentration of the pickling solution in the detection chamber 59. If the concentration is qualified, the control system opens the solenoid valve on the connecting pipe Ⅲ 593. The qualified pickling solution enters the annular pipe Ⅱ 594 through the connecting pipe Ⅲ 593 and is then transported to the roasting furnace through the connecting pipe Ⅱ 595. If the concentration is not qualified, the control system opens the solenoid valve on the connecting pipe Ⅱ 592. The unqualified pickling solution flows into the temporary storage chamber Ⅰ 53 through the connecting pipe Ⅱ 592, waiting to be pumped by the water pump Ⅱ 6 to the concentration chamber Ⅰ 52 for re-concentration.

[0059] During operation, the exhaust manifold 54 at the top of the concentration tank 5 continuously discharges the waste gas generated during concentration, ensuring stable pressure inside the tank.

[0060] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A low-acid-consumption solution treatment apparatus for stainless steel production, characterized in that, include: Temporary storage box (2) is set at the bottom of pickling unit (1) to receive pickling solution; A concentration tank (5) is set on one side of the pickling unit (1). A partition plate (51) is fixedly installed inside the concentration tank (5). The partition plate (51) divides the concentration tank (5) into a concentration chamber I (52) and a temporary storage chamber I (53). Water pump II (6) is located on one side of pickling unit (1). The water inlet end of water pump II (6) is connected to water inlet main pipe (61). The water inlet main pipe (61) is in the shape of a three-way valve. The other two ends are connected to temporary storage chamber I (53) and temporary storage box (2) respectively, and are equipped with valves. The water outlet end of water pump II (6) is connected to spray pipe (62). The top end of spray pipe (62) extends into concentration chamber I (52). An annular pipe I (56) is fixedly installed on the outer wall of the concentration tank (5). Multiple hot air nozzles I (55) are fixedly installed through the outer wall of the concentration tank (5). One end of each of the multiple hot air nozzles I (55) is connected to the annular pipe I (56). The annular pipe I (56) is connected to the hot air source through the connecting pipe I (57). The other end of each hot air nozzle I (55) faces the top of the spray pipe (62). The flow guiding mechanism (7) is set on the concentration tank (5) and located in the concentration chamber I (52) to guide the falling pickling liquid to increase the contact time between the pickling liquid and the hot air. The detection mechanism is set on the outer wall of the concentration tank (5). The detection mechanism includes a detection box (59) for receiving the pickling liquid falling from the concentration chamber I (52). The detection box (59) is equipped with an online refractive index detection device (591) for detecting the concentration of the pickling liquid. It also includes a drain assembly for discharging qualified pickling liquid into the roasting furnace and unqualified pickling liquid into the temporary storage chamber I (53). The pickling solution is discharged from the top of the spray pipe (62), and the flow guide mechanism (7) extends the contact time with the hot air. After concentration, the concentration is detected by the testing mechanism. Qualified pickling solution is discharged to the roasting furnace, and unqualified pickling solution is returned to the temporary storage chamber I (53) and pumped back to the concentration chamber I (52) by the water pump II (6) for circulation concentration.

2. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 1, characterized in that, There are multiple detection boxes (59), all of which are installed on the outer wall of the concentration tank (5). The multiple detection boxes (59) are divided into two groups for alternating use. The detection boxes (59) are connected to the concentration chamber I (52) through the connecting pipe I (58) to receive the falling pickling liquid. The connecting pipe I (58) is equipped with an electromagnetic valve.

3. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 2, characterized in that, The partition plate (51) is conical, and the connecting pipe I (58) is located at the bottom end of the partition plate (51).

4. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 2 or 3, characterized in that, The drain assembly includes multiple connecting pipes II (592) that are fixedly installed through the outer wall of the concentration tank (5). One end of the connecting pipe II (592) is connected to the temporary storage chamber I (53), and the other end of the connecting pipe II (592) is connected to the bottom end of the detection box (59). The connecting pipe II (592) is equipped with an electromagnetic valve. The outer wall of the concentration tank (5) is fixedly provided with an annular pipe II (594), and the top end of the annular pipe II (594) is connected to multiple connecting pipes III (593). The top end of the connecting pipes III (593) is connected to the bottom of the detection box (59), and an electromagnetic valve is provided on the connecting pipes III (593). The annular pipe II (594) is connected to the spray pipe inside the roasting furnace via the connecting pipe II (595).

5. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 1, characterized in that, The flow guiding mechanism (7) includes a flanged structure (71), which is made by flanged top of the spray pipe (62). The top of the flanged structure (71) is provided with a flow-blocking ball (73). The top wall of the concentration tank (5) is fixedly provided with a telescopic support rod (72). The bottom end of the telescopic support rod (72) abuts against the outer wall of the flow-blocking ball (73). The flow-blocking ball (73) blocks the top of the spray pipe (62) to control the pickling liquid to slowly overflow, and the flow is guided by the flanged structure (71) to prolong the heat exchange time.

6. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 5, characterized in that, The outer wall of the flange structure (71) is fixed with multiple connecting rods (74), and the bottom of the multiple connecting rods (74) is fixed with the same guide rib (75). The guide rib (75) is used to collect the pickling liquid flowing down the wall of the concentration tank (5) to further extend the flow path.

7. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 6, characterized in that, The top of the guide rib (75) is provided with multiple stepped structures (76). The guide rib (75) is hollow. Multiple hot air nozzles II (77) are connected to one side of the stepped structure (76). The guide rib (75) is connected to the annular pipe I (56) through a pipe, so that hot air is sprayed out through the hot air nozzles II (77) to assist in heating the pickling solution.

8. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 1, characterized in that, It also includes a cleaning mechanism (4), which includes a support base (41) fixedly installed on one side of the pickling unit (1), a conveyor unit (42) is provided on the support base (41), a collection hopper (3) is connected to the top of one side of the temporary storage box (2), and one side of the collection hopper (3) extends to the bottom of the conveyor unit (42). Multiple scraper plates (43) are fixedly provided on the conveyor belt of the conveyor unit (42), and the scraper plates (43) are used to scrape the impurities on the filter screen plate (31) outward.

9. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 8, characterized in that, A water pump I (45) is fixedly installed on the support base (41), and a spray coil (44) is fixedly installed on one side of the conveyor unit (42). The water inlet of the water pump I (45) is connected to the temporary storage tank (2) through a pipe, and the water outlet of the water pump I (45) is connected to the spray coil (44) through a pipe. Impurities are washed away and acid is recovered to the temporary storage tank (2) through the spray coil (44).

10. The low-acid-consumption solution treatment apparatus for stainless steel production according to claim 5, characterized in that, The telescopic support rod (72) includes a sleeve rod (721) fixedly installed on the top wall of the concentration tank (5). A sliding rod (723) is slidably provided at the bottom end of the sleeve rod (721). An elastic element (722) is provided inside the sleeve rod (721). The two ends of the elastic element (722) respectively abut against the top end of the sliding rod (723) and the top wall of the sleeve rod (721) through spring seats. A positioning groove (724) adapted to the flow-blocking ball (73) is opened at the bottom of the sliding rod (723). The pressure provided by the elastic element (722) makes the flow-blocking ball (73) stably cover the top end of the spray pipe (62).

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