Acid supernatant iron ion reduction treatment tank

Abstract

The application discloses an acid supernatant iron ion reduction treatment tank, and belongs to the technical field of reaction kettles. The main purpose is to improve the mixing uniformity of acid supernatant and reducing agent in the tank body, and reduce the local reaction insufficiency or reducing agent deposition phenomenon. The main technical scheme of the application is as follows: the acid supernatant iron ion reduction treatment tank comprises a tank body, a tank top cover and a stirring device; the tank body is a hollow structure with an open top end; the tank top cover is detachably arranged at the open end of the tank body; the stirring device is arranged on the tank top cover, a rotatable part of the stirring device extends into the tank body, the rotatable part comprises a stirring shaft and at least two groups of stirring paddles, the at least two groups of stirring paddles are arranged in the axial direction of the stirring shaft at intervals, and each group of stirring paddles is inclined downward relative to the radial direction of the stirring shaft.

Description

Technical Field

[0001] This application belongs to the field of reaction vessel technology, specifically relating to an acid supernatant iron ion reduction treatment vessel. Background Technology

[0002] In industrial fields such as hydrometallurgy, chemical wastewater treatment, and metal surface treatment, the treatment of acid supernatant (i.e., the supernatant obtained after solid-liquid separation of acidic solutions) is a crucial step. These solutions often contain high concentrations of iron ions (such as Fe). 3+ Direct discharge or reuse of iron ions in acid supernatant not only wastes resources but may also damage downstream equipment due to the oxidizing and corrosive properties of iron ions, potentially causing environmental pollution. Therefore, reducing iron ions in the acid supernatant (e.g., removing Fe) is necessary. 3+ Reduced to Fe, which is easier to separate or recover 2+ This is an important step in improving the utilization rate of solution resources and reducing environmental risks.

[0003] Currently, the reduction of iron ions in acid supernatants is often achieved by adding a reducing agent (such as sodium sulfite or iron powder) to the treatment tank and using a stirring device to ensure sufficient contact between the reducing agent and the solution, thereby promoting efficient reduction reaction. However, the impellers of traditional stirring devices are mostly horizontal or vertically positioned. During stirring, the solution is prone to local circulation, resulting in uneven mixing of the solution at different depths within the tank. In particular, the bottom area of ​​the tank is prone to reducing agent deposition or incomplete reaction, affecting the iron ion reduction efficiency. Utility Model Content

[0004] In view of this, this application provides an acid supernatant iron ion reduction treatment tank, the main purpose of which is to improve the mixing uniformity of acid supernatant and reducing agent in the tank and reduce local incomplete reaction or reducing agent deposition.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] This application provides an acid supernatant iron ion reduction treatment vessel, comprising:

[0007] The tank body is a hollow structure with an open top;

[0008] A tank top cover, which is detachably disposed at the open end of the tank body;

[0009] A stirring device is disposed on the top cover of the tank. The rotatable part of the stirring device extends into the tank body. The rotatable part includes a stirring shaft and at least two sets of stirring blades. The at least two sets of stirring blades are spaced apart along the axial direction of the stirring shaft, and each set of stirring blades is radially downward relative to the stirring shaft.

[0010] Optionally, the angle between the blade surface of each of the stirring blades and the radial plane of the stirring shaft is 20 degrees to 40 degrees.

[0011] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0012] The feed pipe has one end connected to a gas cylinder and the other end connected to the interior of the tank. The gas cylinder is used to inject a reducing gaseous medium into the tank through the feed pipe, and the outlet end of the feed pipe inside the tank is located between two adjacent sets of stirring blades.

[0013] Optionally, at least two feed pipes are provided, and the at least two feed pipes are circumferentially symmetrically distributed with the axis of the stirring shaft as the center of symmetry.

[0014] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0015] A feeding hopper is provided on and connected to the feed pipe; a first valve is provided at the outlet of the feeding hopper, and a sealing cover is provided at the top opening of the feeding hopper; the feeding hopper is used to feed a reducing solid medium into the tank through the feed pipe.

[0016] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0017] An exhaust pipe is provided on the top cover of the tank, and the exhaust pipe passes through the top cover of the tank and is connected to the interior of the tank body; a pressure gauge and a pressure reducing valve are provided on the exhaust pipe.

[0018] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0019] The inlet pipe is installed on the top cover of the tank and passes through the top cover of the tank and is connected to the interior of the tank body; a second valve is installed on the inlet pipe.

[0020] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0021] The liquid outlet pipe is located at the bottom of the tank and penetrates the bottom wall of the tank and is connected to the interior of the tank; a third valve is provided on the liquid outlet pipe.

[0022] Optionally, the acid supernatant iron ion reduction treatment vessel further includes:

[0023] A sealing ring is provided at the contact surface between the tank body and the tank top cover, and the tank top cover is sealed to the tank body through the sealing ring.

[0024] Optionally, each set of stirring blades includes at least three blades, and the at least three blades are evenly spaced along the circumference of the stirring shaft.

[0025] By employing the above technical solution, this application has at least the following beneficial effects:

[0026] The acid supernatant iron ion reduction treatment tank provided in the embodiments of this application has at least two sets of stirring blades spaced apart along the stirring shaft, which can simultaneously act on the acid supernatant at different depths within the tank. Furthermore, the stirring blades are radially downward inclined relative to the stirring shaft, generating a downward thrust during rotation, driving the upper layer of solution towards the bottom of the tank, while simultaneously causing the solution at the bottom to surge upward, creating a convection effect of vertical circulation. This overcomes the limitations of localized circulation in traditional stirring, reduces solution stratification and reducing agent deposition, ensures sufficient contact between iron ions and the reducing agent, and significantly improves the reduction reaction rate and the completeness of the reaction. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an acid supernatant iron ion reduction treatment vessel according to an optional embodiment of this application.

[0028] The reference numerals in the attached figures are as follows:

[0029] 1. Tank body; 2. Tank top cover; 3. Agitator; 31. Agitator shaft; 32. Agitator blades; 4. Feed pipe; 5. Feed hopper; 51. Sealing cover; 6. Exhaust pipe; 7. Liquid inlet pipe; 8. Liquid outlet pipe; 9. Sealing ring; 10. Pressure reducing valve; 11. Pressure gauge; 12. First valve; 13. Second valve; 14. Third valve. Detailed Implementation

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0034] See Figure 1 As shown, according to an embodiment of this application, an acid supernatant iron ion reduction treatment tank is provided, including a tank body 1, a tank top cover 2, and a stirring device 3; the tank body 1 is a hollow structure with an open top; the tank top cover 2 is detachably disposed at the open end of the tank body 1; the stirring device 3 is disposed on the tank top cover 2, and the rotatable part of the stirring device 3 extends into the tank body 1. The rotatable part includes a stirring shaft 31 and at least two sets of stirring blades 32. The at least two sets of stirring blades 32 are spaced apart along the axial direction of the stirring shaft 31, and each set of stirring blades 32 is radially inclined downward relative to the stirring shaft 31.

[0035] The acid supernatant iron ion reduction treatment tank provided in the embodiments of this application has at least two sets of stirring blades 32 arranged axially along the stirring shaft 31, which can simultaneously act on the acid supernatant at different depths within the tank 1. Furthermore, the stirring blades 32 are radially inclined downwards relative to the stirring shaft 31, generating a downward thrust during rotation, driving the upper layer of solution towards the bottom of the tank, while simultaneously causing the solution at the bottom to surge upwards, creating a convection effect of vertical circulation. This breaks through the limitations of localized circulation in traditional stirring, reduces solution stratification and reducing agent deposition, ensures sufficient contact between iron ions and the reducing agent, and significantly improves the reduction reaction rate and the completeness of the reaction.

[0036] The treatment tank mainly consists of a tank body 1, a tank top cover 2, and a stirring device 3. These three components work together to form a sealable reaction space. Simultaneously, the stirring action enhances the mixing reaction between the acid supernatant and the reducing agent, achieving efficient reduction of iron ions. It should be noted that, in addition to the mixing reaction of the acid supernatant and the reducing agent, the treatment tank can also be used for the reduction treatment of other acidic solutions containing metal ions, chemical transformation reactions of specific components in acidic waste liquids, or reactions in acidic systems requiring multiphase mixing, etc. This application does not limit its application to these applications.

[0037] The tank 1 can be a hollow container with no closed top, forming an open reaction chamber. In practical applications, tank 1 serves as the main reaction site, containing the acid supernatant to be treated and the added reducing agent, providing space for the iron ion reduction reaction. The hollow design ensures sufficient volume to hold the treatment liquid, while the open top facilitates the installation and removal of the tank top cover 2, as well as subsequent maintenance and cleaning operations.

[0038] The tank top cover 2 is connected to the tank body 1 using a non-fixed connection, such as bolted or snap-fit ​​connections, allowing for easy disassembly and assembly as needed. In practical applications, the tank top cover 2 serves two purposes: firstly, it seals the top of the tank body 1, creating a relatively closed reaction environment and reducing solution splashing or volatile substance escape during processing; secondly, it acts as a mounting carrier for the stirring device 3, providing stable support for it.

[0039] The stirring device 3 includes a driving part and a rotatable part. The driving part is fixedly installed on the tank top cover 2, and its output shaft is connected to the rotatable part for transmission. The rotatable part extends into the tank body 1, and its bottom end is suspended in the inner cavity of the tank body 1. The driving part is used to drive the rotatable part to rotate around the axis through the output shaft, so as to realize the stirring and mixing of acid supernatant and reducing agent in the tank body 1.

[0040] Specifically, the drive unit includes, but is not limited to, power equipment such as a motor and a reducer, which is fixed to the tank top cover 2 by bolts or flanges; the rotatable part includes a coaxially arranged stirring shaft 31 and at least two sets of stirring blades 32. The top end of the stirring shaft 31 is connected to the output shaft of the drive unit through a coupling, and the bottom end extends into the reaction zone inside the tank 1. In the working state, the torque output by the drive unit is transmitted to the stirring blades 32 through the stirring shaft 31, causing the acid supernatant and reducing agent in the tank 1 to form axial or radial flow, thereby achieving uniform mixing and chemical reaction of the acid supernatant and reducing agent.

[0041] In this design, each set of stirring blades 32 is spaced apart from each other along the length of the stirring shaft 31. This allows them to simultaneously act on the acid supernatant at different depths within the tank 1, avoiding the limitation of traditional single-set stirring blades 32 which can only stir a localized area. It is understood that two, three, or four sets of stirring blades 32 can be provided, and this application does not impose any restrictions on this.

[0042] Each set of stirring blades 32 is not set horizontally or vertically, but is tilted downward at a certain angle relative to the direction perpendicular to the stirring shaft 31. When the stirring blades 32 rotate, they generate a downward thrust, causing the upper layer of solution to flow towards the bottom of the tank, while simultaneously causing the solution at the bottom of the tank to surge upward, forming a convection effect of vertical circulation.

[0043] In the above embodiments, see Figure 1 As shown, each set of stirring blades 32 includes at least three blades, and the at least three blades are evenly spaced along the circumference of the stirring shaft 31.

[0044] Here, at least three blades are evenly distributed circumferentially, generating 360° radial thrust without dead angles when the stirring shaft 31 rotates, resulting in more balanced force on the solution at the same horizontal cross-section within tank 1. Compared to the unilateral stirring or localized flow lag problems easily caused by two-blade impellers, this layout effectively avoids uneven mixing of the solution in the radial direction, ensuring rapid contact and reaction between the reducing agent and iron ions in the acid supernatant in the horizontal dimension. Furthermore, the evenly distributed multi-blade design creates denser cutting and disturbance to the solution during rotation, promoting a more complex turbulent flow state rather than simple laminar flow. Turbulence significantly improves the mixing efficiency of solutions in different regions, shortens the diffusion path of iron ions and the reducing agent, accelerates the kinetics of the reduction reaction, and thus improves overall processing efficiency.

[0045] The number of stirring blades in each group is no less than three, such as three, four or more.

[0046] Specifically, in the scenario where the stirring blade 32 consists of three blades, when the three inclined blades rotate, they can generate a spiral downward thrust, which drives the solution to spread from the center to the surroundings and then sink, and then surge from the tank wall back to the center, further enhancing the synergistic effect of "radial uniform mixing and axial up-and-down circulation" and avoiding local solution stagnation.

[0047] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the angle between the blade surface of each stirring blade 32 and the radial plane of the stirring shaft 31 is 20 degrees to 40 degrees.

[0048] In this embodiment, the tilt angle of 20 to 40 degrees is the optimal range that balances downward thrust and radial agitation. This angle range allows the stirring blade 32 to generate moderate axial convection and radial diffusion simultaneously when rotating, achieving a synergistic effect of up-and-down churning and horizontal diffusion.

[0049] The angle between the blade surface of each impeller 32 and the radial plane of the agitator shaft 31 can be 20 degrees, 21 degrees, 22 degrees, 23 degrees, 24 degrees, 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees, 31 degrees, 32 degrees, 33 degrees, 34 degrees, 35 degrees, 36 degrees, 37 degrees, 38 degrees, 39 degrees, or 39 degrees. It is understood that the angle between the blade surface of each impeller 32 and the radial plane of the agitator shaft 31 can also be other values ​​besides those mentioned above, as long as the angle between the blade surface of each impeller 32 and the radial plane of the agitator shaft 31 is within the range of 20 degrees to 40 degrees. It should be noted that if the angle is too small, such as less than 20 degrees, the stirring blade 32 will be close to horizontal. Although this can enhance the radial stirring range, the downward force pushing the solution is insufficient, making it difficult to form an effective vertical circulation. If the angle is too large, such as greater than 40 degrees, the downward force will be too strong, causing the solution to accumulate excessively at the bottom of the tank, which will weaken the radial mixing effect.

[0050] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the tank 1 includes a reduced diameter section located at the bottom of the tank 1. The cross-sectional area of ​​the reduced diameter section gradually decreases along the vertical direction, and at least part of the projection of the stirring blades 32 on the tank 1 is located in the reduced diameter section.

[0051] In this embodiment, the cross-sectional area of ​​the narrowed section gradually decreases in the vertical direction, and at least part of the projection of the stirring blade 32 covers this area, so that when the stirring blade 32 rotates, it can directly act on the narrow space at the bottom of the tank, which can significantly improve the turbulence in the bottom area of ​​the tank, avoid the accumulation of precipitates that may be generated in the iron ion reduction reaction at the bottom of the tank, and ensure a more complete reaction.

[0052] The reduced diameter section is part of the lower end of tank 1, not the entire tank 1.

[0053] The narrowing section is shaped like a funnel, extending downwards from the middle of tank 1. Its horizontal cross-section gradually decreases, eventually forming a relatively narrow area at the bottom of tank 1. This spatial contraction guides the solution towards the center of the tank bottom, providing a structural basis for subsequent functions such as enhanced stirring and solution discharge.

[0054] Specifically, with the stirring shaft 31 as the center, the stirring blades 32 are projected radially onto the inner wall contour of the tank 1, and the resulting projection area must cover at least a portion of the narrowed section. That is, the rotation range of at least one set of stirring blades 32 overlaps with the spatial range of the narrowed section in the vertical direction. It is understandable that the entire projection of the bottommost set of stirring blades 32 may fall within the narrowed section, or only a portion of the projection of the bottommost set of stirring blades 32 may cover the narrowed section, as long as the stirring blades 32 can directly act on the solution within the narrowed section during rotation. In practical applications, the rotation radius of the bottommost stirring blade 32 is slightly smaller than the diameter of the upper part of the narrowed section. When the stirring blades 32 rotate, their tips can approach the inclined wall of the narrowed section, both agitating the solution in the central area and flushing the wall to prevent sediment accumulation. Simultaneously, the structure of the narrowed section guides the solution to form a circulating flow.

[0055] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes a feed pipe 4. One end of the feed pipe 4 is connected to a gas cylinder, and the other end is connected to the interior of the tank body 1. The gas cylinder is used to inject a reducing gaseous medium into the tank body 1 through the feed pipe 4, and the outlet end of the feed pipe 4 inside the tank body 1 is located between two adjacent sets of stirring blades 32.

[0056] The reducing gaseous medium can be hydrogen, sulfur dioxide, etc., as long as it can react with the iron ions in the acid supernatant in the liquid phase. This application does not limit this.

[0057] Specifically, a strong turbulent zone exists between two adjacent sets of stirring blades 32. In practical applications, the upper stirring blade 32 pushes the solution downwards as it rotates, while the lower stirring blade 32 agitates the solution upwards. This creates a complex vertical circulation and horizontal shear flow, forming a mixing-enhancing zone. It should be noted that placing the outlet of the feed pipe 4 in this region allows the reducing gaseous medium, once ejected from the outlet, to be immediately sheared and broken into smaller bubbles by the high-speed flowing solution, similar to a gas-liquid emulsification effect. This increases the specific surface area of ​​the bubbles, significantly improving their contact efficiency with the solution and thus accelerating the kinetics of the reduction reaction. In addition, the solution pushed downward by the upper stirring blades 32 carries some bubbles downward, and the solution pushed upward by the lower stirring blades 32 carries some bubbles upward, forming a bubble diffusion path that circulates up and down. At the same time, in conjunction with the radial stirring of the stirring blades 32, that is, the pushing flow along the radius of the stirring shaft 31, the bubbles can diffuse from the outlet end of the feed pipe 4 to the surrounding area of ​​the tank 1, avoiding uneven reaction caused by excessively high bubble concentration in local areas, and ensuring a more uniform iron ion reduction reaction throughout the entire tank.

[0058] In the above embodiments, see Figure 1 As shown, at least two feed pipes 4 are provided, and the at least two feed pipes 4 are circumferentially symmetrically distributed with the axis of the stirring shaft 31 as the center of symmetry.

[0059] Here, at least two feed pipes 4 are symmetrically distributed, allowing the reducing gaseous medium to be injected into the turbulent zone from different radial positions within the tank 1. This avoids problems such as excessively high local concentrations or uneven distribution caused by a single feed. Simultaneously, the symmetrical arrangement of at least two feed pipes 4 enables the reducing gaseous medium to diffuse more rapidly under stirring, forming a more uniform gas-liquid contact with the solution, reducing bubble aggregation or unreacted areas, and improving the utilization rate of the gaseous reducing agent.

[0060] With the central axis of the stirring shaft 31 as the center, at least two feed pipes 4 are evenly arranged along the circumference of the tank 1 at the same or similar horizontal height. For example, when two feed pipes 4 are provided, they will be symmetrically distributed at 180° on both sides of the stirring shaft 31; if four feed pipes 4 are provided, they will be arranged at 90° intervals along the circumference, forming a symmetrical structure around the stirring shaft 31. The outlet ends of these feed pipes 4 all lead to the turbulent zone between two adjacent sets of stirring blades 32.

[0061] Specifically, the circumferentially symmetrically distributed feed pipes 4 outlets, combined with the turbulent environment between adjacent stirring blades 32, allow the reducing gaseous medium to be uniformly distributed radially within the tank 1. Whether in the central region or near the inner wall of the tank 1, the reducing gaseous medium can be contacted more evenly, avoiding incomplete local reactions caused by differences in medium distribution and ensuring the consistency of the iron ion reduction reaction throughout the entire tank. Simultaneously, the bubbles ejected from the symmetrically distributed feed pipes 4, under the radial shear force and circumferential rotational force generated by the stirring blades 32, are subjected to a more balanced external impact, making them easier to break into smaller bubbles. These smaller bubbles have a larger specific surface area, allowing for more thorough contact with iron ions in the solution, accelerating the reaction rate and shortening the processing time.

[0062] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes a feeding hopper 5, which is installed on and connected to the feed pipe 4; a first valve 12 is installed at the outlet of the feeding hopper 5, and a sealing cover plate 51 is installed at the top opening of the feeding hopper 5; the feeding hopper 5 is used to feed a reducing solid medium into the tank 1 through the feed pipe 4.

[0063] In this embodiment, a feeding hopper 5 provides temporary storage space for the reducing solid medium. A certain amount of the reducing solid medium can be pre-loaded into the feeding hopper 5, and then the quantitative or timed addition of the reducing solid medium into the tank 1 can be achieved by controlling the opening and closing of the first valve 12. This avoids the problem of uncontrolled addition that may occur when directly pouring the reducing solid medium into the feed pipe 4, and allows for precise adjustment of the amount of reducing solid medium added according to reaction requirements, ensuring that the iron ion reduction reaction proceeds at a suitable medium concentration, thereby improving reaction efficiency and effectiveness.

[0064] The reducing solid medium can be iron powder, sulfite, etc., as long as it can react with the iron ions in the acid supernatant in the liquid phase. This application does not limit this.

[0065] Among them, the feeding hopper 5 can be used as a container for temporarily storing reducing solid media. It is installed on the feed pipe 4 and connected to the inside of the pipe, forming a feeding channel from the feeding hopper 5 to the feed pipe 4 and then to the tank 1.

[0066] The first valve 12 is installed at the connection between the outlet of the feeding hopper 5 and the feed pipe 4. It can be opened / closed manually or automatically to precisely control the timing and flow rate of the reducing solid medium entering the feed pipe 4. Here, the first valve 12 can be a gate valve or a stop valve.

[0067] The sealing cover 51 is located at the top opening of the feeding hopper 5 and can be tightly closed to form a closed structure. It can be understood that the sealing cover 51 can be tightly closed when no reducing solid medium is added, effectively preventing the backflow of gas, mist or liquid that may be generated in the tank 1 to the outside, avoiding pollution to the operating environment; at the same time, the sealing cover 51 can also prevent dust, impurities and other external substances from entering the feeding hopper 5 and the feed pipe 4, thereby contaminating the acid supernatant in the tank 1 and ensuring the purity of the reaction system.

[0068] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes an exhaust pipe 6, which is installed on the tank top cover 2 and passes through the tank top cover 2 and is connected to the interior of the tank body 1; a pressure gauge 11 and a pressure reducing valve 10 are installed on the exhaust pipe 6.

[0069] In this embodiment, excess gas can be discharged in time by setting an exhaust pipe 6. With the help of pressure reducing valve 10 and pressure gauge 11, the pressure inside tank 1 can be maintained at a stable state suitable for the reaction, avoiding problems such as solution splashing and uneven distribution of reducing agent caused by sudden pressure changes, and ensuring that the iron ion reduction reaction can be carried out efficiently in a controllable environment.

[0070] The exhaust pipe 6 is installed on the top cover 2 of the treatment tank and passes through the top cover 2, connecting with the internal space of the tank body 1, so that the gas inside the tank body 1 can be discharged to the outside through the exhaust pipe 6.

[0071] Pressure gauge 11 is installed on exhaust pipe 6 to monitor the gas pressure inside tank 1 in real time. By reading the pressure gauge 11, the operator can determine whether the pressure inside tank 1 is within a preset range. Here, the preset range refers to the low-pressure zone suitable for the reduction reaction to occur.

[0072] The pressure reducing valve 10 is also installed on the exhaust pipe 6. Its function is to automatically open or manually adjust when the internal pressure of the tank 1 exceeds the preset range, release some gas, reduce the internal pressure of the tank 1, and keep the internal pressure of the tank 1 in a stable state suitable for the reaction.

[0073] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes an inlet pipe 7, which is installed on the tank top cover 2 and passes through the tank top cover 2 and is connected to the interior of the tank body 1; a second valve 13 is installed on the inlet pipe 7.

[0074] In this embodiment, the inlet pipe 7 serves as the channel for the acid supernatant awaiting treatment to enter the tank 1. Combined with the second valve 13, the timing, flow rate, and total amount of the acid supernatant awaiting treatment can be precisely controlled. It is understood that operators can adjust the opening degree or switching frequency of the second valve 13 according to the tank 1 volume and reaction requirements to achieve quantitative and timed addition of the acid supernatant awaiting treatment, avoiding reaction imbalance or overflow problems caused by a large-scale injection at once.

[0075] The inlet pipe 7 is a pipe used to transport the liquid to be processed. It is installed on the tank top cover 2 and penetrates the entire thickness of the tank top cover 2, so that one end of the inlet pipe 7 is connected to the outside of the tank body 1 and the other end is directly connected to the inside of the tank body 1, forming a liquid input channel from the external storage to the inlet pipe 7 and then to the tank body 1.

[0076] The second valve 13 is installed on the inlet pipe 7 and can be opened and closed manually or automatically to precisely control the time, flow rate, and total amount of liquid entering the tank 1. Here, the second valve 13 can be a ball valve or a gate valve, etc.

[0077] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes an outlet pipe 8, which is located at the bottom of the tank body 1 and penetrates the bottom wall of the tank body 1 and is connected to the interior of the tank body 1; a third valve 14 is provided on the outlet pipe 8.

[0078] In this embodiment, by setting a liquid outlet pipe 8 at the bottom of the tank 1, the solution after the reaction is completed can be naturally collected by gravity and discharged through the liquid outlet pipe 8. Compared with the liquid discharge structure set on the side or top of the tank 1, the solution in the tank 1 can be emptied more thoroughly, reducing the amount of residue.

[0079] Among them, the liquid outlet pipe 8 is a pipe used to discharge the solution after the reaction. It is set at the bottom of the tank 1 and the pipe passes through the bottom wall of the tank 1, so that one end of the liquid outlet pipe 8 is connected to the inside of the tank 1 and the other end is connected to the outside of the tank 1, forming a liquid discharge channel from the tank 1 to the liquid outlet pipe 8 and then to the outside.

[0080] The third valve 14 is installed on the outlet pipe 8 and can be opened and closed manually or automatically to precisely control the time, flow rate, and discharge volume of the solution discharged from the tank 1 after the reaction. Here, the third valve 14 can be a solenoid valve, etc.

[0081] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the acid supernatant iron ion reduction treatment tank also includes a sealing ring 9. The sealing ring 9 is located at the contact surface between the tank body 1 and the tank top cover 2. The tank top cover 2 is sealed to the tank body 1 through the sealing ring 9.

[0082] The sealing ring 9 can be made of elastic materials such as rubber. When the top cover 2 and the tank body 1 are attached, it is compressed to fill the tiny gaps between them and form a reliable sealing interface. This effectively prevents gas or mist inside the tank from escaping from the contact surface, while also preventing external air, dust, and other impurities from entering the tank, ensuring the purity and sealing of the reaction system.

[0083] Specifically, the sealing ring 9 is installed on the mating surface between the opening edge at the top of the tank body 1 and the bottom edge of the tank top cover 2, that is, at the plane gap where the tank body 1 and the tank top cover 2 come into contact. In practical applications, when the tank top cover 2 is installed onto the tank body 1 by bolts, clips, or other means, the tank top cover 2 will compress the sealing ring 9, causing it to undergo elastic deformation, thereby filling the tiny gap between the tank body 1 and the tank top cover 2.

[0084] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0085] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A treatment vessel for reducing iron ions in acid supernatant, characterized in that, include: The tank body is a hollow structure with an open top; A tank top cover, which is detachably disposed at the open end of the tank body; A stirring device is disposed on the top cover of the tank. The rotatable part of the stirring device extends into the tank body. The rotatable part includes a stirring shaft and at least two sets of stirring blades. The at least two sets of stirring blades are spaced apart along the axial direction of the stirring shaft, and each set of stirring blades is radially downward relative to the stirring shaft.

2. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, The angle between the blade surface of each of the stirring blades and the radial plane of the stirring shaft is 20 degrees to 40 degrees.

3. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Also includes: The feed pipe has one end connected to a gas cylinder and the other end connected to the interior of the tank. The gas cylinder is used to inject a reducing gaseous medium into the tank through the feed pipe, and the outlet end of the feed pipe inside the tank is located between two adjacent sets of stirring blades.

4. The acid supernatant iron ion reduction treatment tank according to claim 3, characterized in that, At least two feed pipes are provided, and the at least two feed pipes are circumferentially symmetrically distributed with the axis of the stirring shaft as the center of symmetry.

5. The acid supernatant iron ion reduction treatment tank according to claim 3, characterized in that, Also includes: A feeding hopper is provided on and connected to the feed pipe; a first valve is provided at the outlet of the feeding hopper, and a sealing cover is provided at the top opening of the feeding hopper; the feeding hopper is used to feed a reducing solid medium into the tank through the feed pipe.

6. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Also includes: An exhaust pipe is provided on the top cover of the tank, and the exhaust pipe passes through the top cover of the tank and is connected to the interior of the tank body; a pressure gauge and a pressure reducing valve are provided on the exhaust pipe.

7. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Also includes: The inlet pipe is installed on the top cover of the tank and passes through the top cover of the tank and is connected to the interior of the tank body; a second valve is installed on the inlet pipe.

8. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Also includes: The liquid outlet pipe is located at the bottom of the tank and penetrates the bottom wall of the tank and is connected to the interior of the tank; a third valve is provided on the liquid outlet pipe.

9. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Also includes: A sealing ring is provided at the contact surface between the tank body and the tank top cover, and the tank top cover is sealed to the tank body through the sealing ring.

10. The acid supernatant iron ion reduction treatment tank according to claim 1, characterized in that, Each set of stirring blades includes at least three blades, and the at least three blades are evenly spaced along the circumference of the stirring shaft.

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