Treatment device for recovering arsenic from arsenic sulfide residue

Abstract

The utility model discloses a kind of arsenic sulfide slag recovery arsenic with processing device, including reduction tank, liquid inlet and outlet are respectively arranged in the two sides of reduction tank, top is communicated with liquid inlet pipe and feed pipe, and storage tank and the storage tank of bottom with liquid inlet pipe intercommunication are supported in upper portion;The bottom of storage tank is communicated with the blanking pipe of electromagnetic valve, weighing device and the weighing tank of top end and blanking pipe bottom end contact are equipped below blanking pipe;Weighing tank one side top end is equipped with material receiving port, and the other side is equipped with automatic adjusting mechanism;The bottom plate of weighing tank is movable plate, upper end is equipped with material level meter, and driving part that movable plate is opened and closed is connected outside weighing tank;Storage tank top is equipped with feed inlet and water inlet pipe with flowmeter, arsenic analysis detector is equipped in reduction tank top with probe located in reduction tank, lifting mechanism that driving weighing device lifts and conveying mechanism that conveying weighing tank to feed inlet pipe, feed inlet upper portion;Overall degree of automation is high, labor intensity is low, reduction agent is put with high precision and low in cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of arsenic-containing hazardous waste treatment, and more specifically, it relates to a treatment device for arsenic recovery from arsenic sulfide slag. Background Technology

[0002] With the rapid development of my country's industry, a large amount of arsenic-containing wastewater is generated during chemical and metallurgical production processes. The treatment of this wastewater typically involves sulfidation to remove arsenic, resulting in a large amount of arsenic sulfide slag. The arsenic sulfide in this slag can leach into the soil, posing a serious threat to the environment and human health. Although arsenic sulfide is highly toxic, it is still used in the pharmaceutical and metallurgical industries. Therefore, the treatment of arsenic sulfide slag is a challenging problem that needs to be solved in the fields of environmental protection and resource recycling. Due to the high arsenic content in arsenic sulfide slag, in recent years, its treatment has gradually shifted from "arsenic fixation" to arsenic recovery.

[0003] Currently, common methods for recovering arsenic from arsenic sulfide slag often involve adding a reducing agent to the slag to convert soluble arsenic ions into less soluble metallic arsenic through a reduction reaction. In practice, the amount of powdered reducing agent added depends on the arsenic content of the arsenic sulfide slag in the reduction tank. This requires operators to weigh the reducing agent. However, to avoid overdosing, after manually testing the arsenic content, the reducing agent is often manually weighed and added two or more times using a single weighing device. This manual weighing and addition is not only time-consuming and labor-intensive, but also highly susceptible to errors due to human measurement or insufficient power in the weighing device. Due to reasons such as lack of calibration, large weighing errors may occur, resulting in excessive or insufficient addition of reducing agent, leading to problems of low accuracy and high cost in reducing agent addition. In addition, when using liquid reducing agents that require quantitative proportioning, manual proportioning and mixing requires a lot of manpower from operators, resulting in high labor costs. Existing automatic proportioning and mixing methods often require a separate reducing tank with a liquid inlet and a mixing device that integrates the powder tank and liquid tank through pipelines. The material in the dispensing tank is susceptible to moisture from the liquid tank, which increases the overall cost. Overall, there are problems of high labor intensity, low accuracy in reducing agent addition, and high cost. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a treatment device for arsenic recovery from arsenic sulfide slag, which has a high degree of automation and advantages such as low labor intensity, high precision in reducing agent dosing, and low cost.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A treatment device for recovering arsenic from arsenic sulfide slag includes a reduction tank. The reduction tank has an inlet and an outlet, both equipped with valves, on both sides. The top of the tank is connected to an inlet pipe and a feed pipe, both also equipped with valves. A storage tank and a liquid storage tank are mounted above the reduction tank. A discharge pipe is connected to the bottom of the storage tank, and a solenoid valve is installed on the discharge pipe. A weighing device and a weighing box with its top end in contact with the bottom end of the discharge pipe are located below the discharge pipe. A receiving port is located on one top side of the weighing box, and an automatic adjustment mechanism for adjusting its storage capacity is located on the other side. The bottom plate of the weighing box is a movable plate, with a level gauge inside the upper end. A drive unit for opening and closing the movable plate is connected to the outside of the weighing box. The top of the liquid storage tank has an inlet with a valve and a water inlet pipe with a flow meter, and its bottom is connected to the inlet pipe. An arsenic analyzer with a probe located inside the reduction tank, a lifting mechanism for driving the weighing device to move up and down, and a conveying mechanism for transporting the weighing box to the feed pipe and above the inlet are installed on the top of the reduction tank.

[0007] Further configuration: The conveying mechanism includes a turntable and a rotary drive device for driving the turntable to rotate. The turntable is mounted on top of the reduction tank. Both sides of the bottom of the weighing box have outwardly extending connecting parts. The connecting parts are detachably connected to the upper end face of the turntable by bolts. The upper end face of the turntable has a through hole for material to be discharged from the bottom of the weighing box. The cross-section of the through hole is larger than the cross-section of the bottom opening of the weighing box and smaller than the cross-section of the feed inlet and the feed pipe. The discharge pipe is located above the turntable, and the feed pipe and the feed inlet are both located below the turntable. The discharge pipe, the feed pipe, and the feed inlet are arranged sequentially along the conveying direction of the turntable.

[0008] Further configuration: The driving component is a rotary motor, a rotating shaft is fixedly connected to one side of the movable plate, and the bottom side of the weighing box is rotatably connected to both ends of the rotating shaft. The movable plate is located in the through hole; the driving end of the rotary motor is fixedly connected to one end of the rotating shaft and is used to drive the movable plate to rotate downward 90° in the through hole until the other side of the movable plate rotates into the feed inlet or feed pipe.

[0009] Further configuration: A baffle is connected to the bottom side of the storage tank and the top of the liquid storage tank, and the baffle extends along the conveying direction of the conveying mechanism; the baffle is located above the weighing box and is used to prevent foreign objects from entering the receiving port or powdered reducing agent from overflowing out of the receiving port.

[0010] Further configuration: The automatic adjustment mechanism includes an adjustment plate, a threaded rod, a set of guide rods, a sliding plate located on the other side of the weighing box, a stepper motor, and a support; the support is U-shaped, with its two vertical ends connected to the other side of the weighing box; the two ends of the threaded rod are rotatably connected to the horizontal end of the support and the other side of the weighing box, respectively; the stepper motor is fixedly installed on the horizontal end of the support and is used to drive the threaded rod to rotate; the sliding plate is threadedly connected to the threaded rod and is located between the horizontal end of the support and the other side of the weighing box; the adjustment plate is located inside the other side of the weighing box, and its side closest to the support is fixedly connected to the sliding plate through the guide rod; the other side of the weighing box has a guide hole for the guide rod to pass through; a material cavity is formed between the other side of the adjustment plate and the five sides of the weighing box away from the support.

[0011] Further configuration: The remaining four sides of the adjustment plate are fitted to the inner wall of the weighing box and are embedded with sealing gaskets.

[0012] Further configuration: Several weighing boxes are provided, each for powder reducing agents of different densities. The outer length, width and height of each weighing box are the same, and the maximum capacity inside each weighing box is different. Each weighing box is equipped with the automatic adjustment mechanism, and the conveying end of the conveying mechanism is detachably connected to the weighing box.

[0013] Further features: The reduction tank, the liquid storage tank, and the material storage tank are all equipped with automatic stirring devices.

[0014] Further configuration: The arsenic analyzer is an X-ray fluorescence spectrometer.

[0015] Further configuration: The weighing device includes a tray and a strain gauge load cell, wherein the strain gauge load cell is embedded in the tray.

[0016] In summary, this invention, through an inlet, a reduction tank, and an arsenic analyzer, automatically and repeatedly detects the arsenic content in arsenic sulfide slag. Through a weighing tank, an automatic adjustment mechanism, a storage tank, a level gauge, a solenoid valve, and a discharge pipe, the system automatically adjusts the volume of the storage tank to the volume corresponding to the mass of the coarsely added reducing agent based on the detected arsenic content. The solenoid valve then discharges the powdered reducing agent from the storage tank into the weighing tank until the level gauge indicates the tank is full, thus achieving the function of weighing the mass of the coarsely added reducing agent. A conveying mechanism, a drive unit, and a movable plate automatically transport and dispense the weighed reducing agent into the storage tank or reduction tank. A lifting mechanism and a weighing device are used to weigh the mass of the finely added reducing agent that falls into the weighing tank. When water is needed to inject the reducing agent into a pre-mixed solution, a flow meter controls the amount of water or liquid injected into the storage tank through the water inlet pipe.

[0017] This invention boasts a high degree of automation, combining a weighing box, automatic adjustment mechanism, lifting mechanism, and weighing device to perform pre- and post-coarse and fine-tuning of the reducing agent. The pre- and post-composition methods ensure precise control of the reducing agent dosage based on real-time arsenic content monitoring. Furthermore, the powder reducing agent conveying system employs an open conveying mechanism, avoiding the problems of traditional integrated pipelines, such as inconvenience in cleaning, susceptibility to moisture in the storage tank, and the high cost of multiple sets of equipment. It is suitable for adding both powdered and liquid reducing agents, and offers advantages such as low labor intensity, high accuracy in reducing agent dispensing, and low cost. Attached Figure Description

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

[0019] Figure 2 This is a partial cross-sectional view of Embodiment 1 of the present utility model;

[0020] Figure 3 for Figure 2 A magnified view of part A;

[0021] Figure 4 This is a partial exploded view of Embodiment 1 of the present invention;

[0022] Figure 5 This is a schematic diagram of the weighing box receiving structure according to Embodiment 1 of this utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the weighing box in Embodiment 1 of this utility model;

[0024] Figure 7 This is a cross-sectional view of a weighing box with different internal cavities according to Embodiment 2 of this utility model;

[0025] Figure 8 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model;

[0026] Figure 9 for Figure 8 A magnified view of part B;

[0027] Figure 10 This is a schematic diagram of the overall structure of Embodiment 4 of this utility model.

[0028] In the diagram: 1. Reduction tank; 2. Inlet; 3. Outlet; 4. Inlet pipe; 5. Feed pipe; 6. Storage tank; 7. Storage tank; 8. Discharge pipe; 9. Solenoid valve; 10. Weighing device; 11. Weighing box; 12. Material inlet; 13. Movable plate; 14. Level gauge; 15. Drive component; 16. Feed inlet; 17. Water inlet pipe; 18. Arsenic analyzer; 19. Lifting mechanism; 20. Turntable; 21. Rotary drive device; 2. Connecting part; 23. Through hole; 24. Rotating shaft; 25. Baffle; 26. Adjusting plate; 27. Threaded rod; 28. Guide rod; 29. ​​Slide plate; 30. Stepper motor; 31. Support; 32. Guide hole; 33. Material chamber; 34. Sealing gasket; 35. Automatic stirring device; 36. Support plate; 37. Strain gauge sensor; 38. Platform; 39. Linear guide rail; 40. Clearance hole; 41. Transfer hopper; 42. Tension sensor. Detailed Implementation

[0029] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. It should be noted that the terms "upper" and "lower" used in the following description refer to the attached drawings. Figure 2 The direction in the middle, the words "bottom" and "top" refer to the attached Figure 2 The direction towards the geometric center of a specific component.

[0030] Please refer to Figures 1 to 6 As shown, the first embodiment provided by this utility model is as follows:

[0031] A treatment device for recovering arsenic from arsenic sulfide slag includes a reduction tank 1. The reduction tank 1 has an inlet 2 and an outlet 3, both equipped with valves, on both sides. The top of the tank is connected to an inlet pipe 4 and a feed pipe 5, both also equipped with valves. A storage tank 6 and a liquid storage tank 7 are mounted above the reduction tank 1. The bottom of the storage tank 6 is connected to a discharge pipe 8, which is equipped with a solenoid valve 9. Below the discharge pipe 8 are a weighing device 10 and a weighing box 11 whose top end contacts the bottom end of the discharge pipe 8. The weighing box 11 has a receiving port 12 on one side at the top, and a device for adjusting its storage capacity on the other side. The weighing box 11 has an automatic adjustment mechanism for material capacity; the bottom plate of the weighing box 11 is a movable plate 13, and a material level gauge 14 is installed inside the upper end. The weighing box 11 is connected to a drive unit 15 that drives the movable plate 13 to open and close. The top of the liquid storage tank 7 is provided with a feed port 16 with a valve and a water inlet pipe 17 with a flow meter, and the bottom is connected to the liquid inlet pipe 4. The top of the reduction tank 1 is equipped with an arsenic analyzer 18 with a probe located inside the reduction tank 1, a lifting mechanism 19 that drives the weighing device 10 to rise and fall, and a conveying mechanism that transports the weighing box 11 to the feed pipe 5 and above the feed port 16.

[0032] As described above, when it is necessary to recover arsenic from arsenic sulfide slag using a powdered reducing agent, firstly, the arsenic sulfide slag enters the reduction tank 1 through the inlet 2. An arsenic analyzer 18 is used to perform a preliminary detection of the arsenic content in the arsenic sulfide slag in the reduction tank 1, and the preliminary arsenic content is sent to an external control system (not shown in the figure, but the same applies throughout). Based on the arsenic content, the external control system finds the preset mass of the corresponding type of powdered reducing agent. The external control system then selects the nearest integer value from the required mass of the powdered reducing agent. The mass of reducing agent added for coarse adjustment is used as the mass of reducing agent added for fine adjustment (for example, if the required mass of reducing agent is 109 kg, the mass of reducing agent added for coarse adjustment is 100 kg, and the mass of reducing agent added for fine adjustment is 9 kg; or if the required mass of reducing agent is 92.5 kg, the mass of reducing agent added for coarse adjustment is 90 kg, and the mass of reducing agent added for fine adjustment is 2.5 kg). Using the weighing box 11 and the automatic adjustment mechanism, the mass of reducing agent added for coarse adjustment is first weighed, and then the mass of reducing agent added for fine adjustment is weighed through the weighing box 11 and the weighing device 10.

[0033] When it is necessary to weigh the reducing agent for coarse adjustment, firstly, the external control system controls the automatic adjustment mechanism to increase or decrease the volume of the reducing agent in the weighing tank 11 according to the corresponding preset integer mass value. When the volume of the powdered reducing agent reaches the integer mass value, the solenoid valve 9 is activated. The powdered reducing agent in the storage tank 6 falls into the weighing tank 11 through the discharge pipe 8. When the level gauge 14 in the weighing tank 11 detects that the reducing agent storage level has reached the preset height, that is, the mass of the reducing agent has reached the integer mass value, based on the principle that mass equals density multiplied by volume, a signal is sent to the external control system. The external control system controls the solenoid valve 9 to close. Before the material is discharged from the storage tank 6, the lifting mechanism 19 has already moved the weighing device 10 to the bottom of the weighing tank 11. At this time, the weighing device 10 will detect the reducing agent in the weighing tank 11. The mass (the weighing value minus the initial weighing value) is sent to the external control system and compared with the mass corresponding to the adjusted volume of the weighing box 11. At this time, the value detected by the weighing device 10 is the same as the corresponding value of the weighing box 11 (i.e., the error between them is within the allowable error range). Then, the lifting mechanism 19 drives the weighing device 10 to descend. Using the conveying mechanism, the weighing box 11 containing the nearest integer value of the reducing agent is moved to the top of the feed pipe 5. After that, the drive component 15 is activated. The drive component 15 drives the movable plate 13 to open the bottom of the weighing box 11. Under the action of gravity, the reducing agent in the weighing box 11 falls into the reduction tank 1. After that, the drive component 15 drives the movable plate 13 to close the bottom of the weighing box 11 again. Finally, the conveying mechanism drives the empty weighing box 11 back to the discharge pipe 8.

[0034] When the conveying mechanism returns the empty weighing box 11 to below the discharge pipe 8, and the amount of reducing agent to be added needs to be finely adjusted, firstly, the lifting mechanism 19 raises the weighing device 10 to the bottom of the weighing box 11. The external control system controls the solenoid valve 9 to open. Under the action of gravity, the powdered reducing agent in the storage box 6 falls into the weighing box 11 through the receiving port 12. The weighing device 10 is used to detect the mass of the reducing agent in the weighing box 11. When the mass of the reducing agent in the weighing box 11 detected by the weighing device 10 reaches the corresponding remaining small value, the external control system receives the numerical signal from the weighing device 10 and controls the solenoid valve 9 to close. The conveying steps are the same as the conveying steps of the reducing agent for coarse adjustment, so they will not be described in detail here.

[0035] When a reducing agent in a pre-mixed solution is required, the powdered reducing agent is weighed in the same way as described above. The difference is that the conveying mechanism transports the weighing box 11 containing the weighed reducing agent to the top of the inlet 16. The driving component 15 is used to drive the movable plate 13 to open the bottom of the weighing box 11. The batches of weighed reducing agent are first and then placed into the storage tank 7 through the inlet 16. External water or liquid is injected into the storage tank 7 by an external pump using the water inlet pipe 17 for mixing. The corresponding amount of water or liquid entering is controlled by a flow meter (not shown in the figure, as in the entire text).

[0036] In addition, when weighing the reducing agent for coarse adjustment, the weighing device 10 also serves to verify whether the weighing box 11 or the automatic adjustment mechanism is malfunctioning or inaccurate. If there is a large error between the two, the staff needs to troubleshoot the fault; to avoid the overall accuracy of reducing agent dosing being affected by inaccurate weighing due to weighing equipment failure. Furthermore, when weighing the reducing agent for fine adjustment, the external control system will, based on the remaining arsenic content detected in real time after the initial dosing, for example, if the required reducing agent mass is 82kg, first dosing 80kg of reducing agent, and then, based on the remaining arsenic content detected in real time after the initial dosing, if the remaining arsenic content to be reduced requires about 2kg of reducing agent, and the error is within the set error allowable range, repeat the above weighing steps. If the error is too large, then the reducing agent is weighed and dosing according to the subsequent detected arsenic content value, and the weighing method and steps remain the same as above.

[0037] Furthermore, the conveying mechanism includes a turntable 20 and a rotary drive device 21 for driving the turntable 20 to rotate. The turntable 20 is mounted on the top of the reduction tank 1. Both sides of the bottom of the weighing box 11 have connecting parts 22 extending outward. The connecting parts 22 are detachably connected to the upper end face of the turntable 20 by bolts. The upper end face of the turntable 20 has a through hole 23 for discharging material from the bottom of the weighing box 11. The cross-section of the through hole 23 is larger than the cross-section of the bottom opening of the weighing box 11 and smaller than the cross-section of the inlet 16 and the feed pipe 5. The discharge pipe 8 is located above the turntable 20, and the feed pipe 5 and the inlet 16 are both located below the turntable 20. The discharge pipe 8, the feed pipe 5, and the inlet 16 are arranged sequentially along the conveying direction of the turntable 20. In addition, the rotary drive device 21 in this embodiment can be composed of a rotary motor or a rotary motor plus a rotary divider. It is not limited to this structure. Any rotary structure that can achieve the function of driving the turntable 20 to rotate at a fixed point is acceptable.

[0038] As described above, when the weighing box 11 needs to be conveyed, the rotary drive device 21 is activated. The rotary drive device 21 drives the turntable 20 to rotate in the direction of the discharge pipe 8, the feed pipe 5, or the feed port 16, thereby rotating the weighing box 11 to directly below the discharge pipe 8, directly above the feed pipe 5, or directly above the feed port 16. The weighing box 11 is configured to be detachably connected to the turntable 20 by bolts using the connecting part 22. When the weighing box 11 needs to be cleaned or replaced, it is only necessary to unscrew the bolts and remove the connecting part 22 from the turntable 20. The cross-section of the through hole 23 is set to be larger than the cross-section of the bottom opening of the weighing box 11 and smaller than the cross-section of the feed port 16 and the feed pipe 5, so that all the powder reducing agent in the weighing box 11 can fall into the feed pipe 5 and the feed port 16 through the through hole 23, avoiding waste of powder reducing agent, and further reducing costs and improving the accuracy of reducing agent dosing.

[0039] Furthermore, the driving component 15 is a rotary motor, and a rotating shaft 24 is fixedly connected to one side of the movable plate 13. The bottom side of the weighing box 11 is rotatably connected to both ends of the rotating shaft 24, and the movable plate 13 is located in the through hole 23. The driving end of the rotary motor is fixedly connected to one end of the rotating shaft 24 and is used to drive the movable plate 13 to rotate downward 90° in the through hole 23 until the other side of the movable plate 13 rotates into the feed inlet 16 or the feed pipe 5. To facilitate the placement of the driving component 15, a synchronous transmission mechanism can be connected between the driving end of the rotary motor and one end of the rotating shaft 24, or a clearance groove can be opened in the turntable 20. It is not limited to the above methods.

[0040] As described above, when the reducing agent in the weighing box 11 needs to be placed into the reduction tank 1 or the storage tank 7, and the conveying mechanism drives the weighing box 11 to the top of the inlet 16 or the feed pipe 5, it is only necessary to start the rotary motor. The drive end of the rotary motor drives the rotating shaft 24 to rotate downward, thereby driving the movable plate 13 to rotate downward in the through hole 23. During the rotation, the powdered reducing agent will fall into the inlet 16 or the feed pipe 5 along with the rotating movable plate 13 until the movable plate 13 rotates downward 90°, and the other side of the movable plate 13 is located in the inlet 16 or the feed pipe 5. After the material is discharged, the rotary motor drives the movable plate 13 to rotate upward and reset to the through hole 23, re-closing the bottom opening of the weighing box 11, thus realizing the automatic control of the opening and closing of the movable plate 13. Setting the movable plate 13 in the through hole 23 makes it easier for all the powdered reducing agent to fall into the inlet 16 or the feed pipe 5.

[0041] Furthermore, a baffle 25 is connected to the bottom side of the storage tank 6 and the top of the liquid storage tank 7. The baffle 25 extends along the conveying direction of the conveying mechanism. The baffle 25 is located above the weighing box 11 and is used to prevent foreign objects from entering the receiving port 12 or the powdered reducing agent from overflowing out of the receiving port 12.

[0042] As can be seen from the above description, during the process of conveying the weighing box 11 for receiving, weighing, adding and mixing with liquid, the baffle 25 prevents dust and other foreign objects from entering the weighing box 11 through the receiving port 12, or prevents the powdered reducing agent in the weighing box 11 from being shaken out of the receiving port 12 due to the slight vibration of the conveying mechanism during the conveying process.

[0043] Furthermore, the automatic adjustment mechanism includes an adjustment plate 26, a threaded rod 27, a set of guide rods 28, a sliding plate 29 located on the other side of the weighing box 11, a stepper motor 30, and a support 31. The support 31 is U-shaped, with its two vertical ends connected to the other side of the weighing box 11. The two ends of the threaded rod 27 are rotatably connected to the horizontal end of the support 31 and the other side of the weighing box 11, respectively. The stepper motor 30 is fixedly installed on the horizontal end of the support 31 and is used to drive the threaded rod 27 to rotate. The sliding plate 29 is threadedly connected to the threaded rod 27 and is located between the horizontal end of the support 31 and the other side of the weighing box 11. The adjustment plate 26 is located inside the other side of the weighing box 11, and its side closest to the support 31 is fixedly connected to the sliding plate 29 via the guide rods 28. The other side of the weighing box 11 has a guide hole 32 for the guide rods 28 to pass through. A material cavity 33 is formed between the other side of the adjustment plate 26 and the five sides of the weighing box 11 away from the support 31.

[0044] As described above, when the external control system receives the arsenic content signal detected by the arsenic analyzer 18, it finds the preset mass of coarse or fine adjustment of the reducing agent based on the detected arsenic content. According to the preset rotation frequency of the stepper motor 30 corresponding to the mass value, the external control system adjusts the rotation frequency of the stepper motor 30. The stepper motor 30 drives the threaded rod 27 to rotate, thereby moving the slide plate 29 towards the receiving port 12. This, in turn, moves the adjusting plate 26 within the weighing box 11 via the guide rod 28, adjusting the capacity of the material chamber 33. When the capacity of the material chamber 33 multiplied by the density of the reducing agent equals the required mass of reducing agent, the stepper motor 30 stops rotating. This achieves automatic adjustment of the material chamber 33 within the weighing box 11, which carries the reducing agent. After all the powdered reducing agent in the weighing box 11 has been added to the reduction tank 1 or the storage tank 7, the external control system or the stepper motor 30 rotates in the opposite direction at the same frequency until the adjusting plate 26 returns to its initial position for the next weighing adjustment.

[0045] Furthermore, the remaining four sides of the adjusting plate 26 are fitted to the inner wall of the weighing box 11 and are fitted with a sealing gasket 34.

[0046] As can be seen from the above description, the sealing gasket 34 is used to prevent the powder reducing agent in the material chamber 33 from entering the other side of the weighing box 11 through the gap between the remaining side of the adjusting plate 26 and the inner wall of the weighing box 11, thereby ensuring the reducing agent dosing rate and avoiding excessive waste of reducing agent.

[0047] Furthermore, automatic stirring devices 35 are provided in the reduction tank 1, the liquid storage tank 7, and the material storage tank 6. The automatic stirring devices 35 in this embodiment are all composed of a motor, stirring blades, and stirring shaft. They are existing technologies and will not be described in detail here. They are not limited to this structure, and other stirring structures are also acceptable.

[0048] As can be seen from the above description, the automatic stirring device 35 in the reduction tank 1 is used to mix the reducing agent and arsenic sulfide slag thoroughly and evenly, thereby accelerating the reaction; the automatic stirring device 35 in the storage tank 7 is used to mix the powdered reducing agent and water in a more uniform ratio; and the automatic stirring device 35 in the storage tank 6 is used to stir the powdered reducing agent in the storage tank 6 to prevent the powdered reducing agent in the discharge tank from clumping.

[0049] Furthermore, the arsenic analyzer 18 is an X-ray fluorescence spectrometer.

[0050] Furthermore, the weighing device 10 includes a tray 36 and a strain gauge load cell, which is embedded in the tray 36.

[0051] As described above, when the weighing box 11 is located below the storage box 6 and waiting to receive material, the lifting mechanism 19 is activated. The lifting end of the lifting mechanism 19 drives the pallet 36 to rise towards the bottom of the turntable 20 until the pallet 36 rises to the preset value. At this time, the pallet 36 enters the through hole 23 and supports the bottom of the movable plate 13. The pallet 36 is subjected to the pressure of the empty weighing box 11 and sends the initial weight value signal to the external control system. Regardless of whether the reducing agent is coarsely added or finely added, when the strain gauge weighing sensor detects that the weight of the reducing agent in the weighing box 11 reaches the required weight value, the external control system controls the solenoid valve 9 to close, so that the weighing device 10 can automatically weigh.

[0052] In this embodiment, the lifting mechanism 19 is a cylinder or an electric push rod, and is not limited to this lifting structure. Other lifting structures that can automatically drive the weighing device 10 to lift are also acceptable. In order to facilitate the cleaning and replenishment of the storage box 6, a pressure sensor can be installed in the storage box 6 and a replenishment pipe with an electric valve can be connected to the top of the storage box 6. When the pressure sensor detects that the height is lower than the preset height, the replenishment pipe (not shown in the figure) is opened to automatically replenish the material. Alternatively, the top of the storage box 6 can be made into a detachable structure or the top of the storage box 6 can be connected to a cleaning pipe (not shown in the figure).

[0053] Example 2 differs from Example 1 in that, as Figure 7 As shown, several weighing boxes 11 are provided, each for a different density of powder reducing agent. The outer length, width, and height of each weighing box 11 are the same, and the maximum capacity of each weighing box 11 is different. Each weighing box 11 is equipped with an automatic adjustment mechanism, and the conveying end of the conveying mechanism is detachably connected to the weighing box 11. By setting weighing boxes 11 with different maximum capacities, it is convenient to weigh powder reducing agents with different seals. The purpose of setting the outer length, width, and height of each weighing box 11 to be the same is to avoid affecting the normal use of the weighing device 10, baffle 25, etc.

[0054] Example 3 differs from Example 1 in that, as Figure 8 and 9 As shown, the conveying mechanism includes a platform 38 and a linear guide rail 39 mounted on the platform 38. The platform 38 is mounted on top of the reduction tank 1. One side of the weighing box 11 is detachably connected to the slider of the linear guide rail 39. In this embodiment, there are two baffles 25, located on both sides of the feed pipe 8, and the baffles 25 are mounted parallel above the platform 38. Figure 8(The middle baffle 25 is not shown). The weighing box 11 is still located between the platform 38 and the baffle 25. The upper end face of the platform 38 has through holes 23 on both sides for the bottom of the weighing box 11 to discharge material. A clearance hole 40 is opened in the middle for the weighing device 10 to pass through. The cross-section of the through hole 23 is larger than the cross-section of the bottom opening of the weighing box 11 and smaller than the cross-section of the feed inlet 16 and the feed pipe 5. The discharge pipe 8 is located above the platform 38. The feed pipe 5 and the feed inlet 16 are located directly below the two through holes 23. The discharge pipe 8 is located between the feed pipe 5 and the feed inlet 16. The movable plate 13 is located above and outside the through hole 23. During operation, the motor of the linear guide 39 is started, which drives the slider of the linear guide 39 and the weighing box 11 to move towards one side or the other side of the platform 38 until the weighing box 11 moves to the through hole 23 of the feed pipe 5 or the feed inlet 16. The material discharge method is the same as in Embodiment 1.

[0055] Example 4 differs from Example 1 in that, as Figure 10 As shown, the upper ends of the feeding pipe 8 are connected to a transfer hopper 41. The lower edge of the storage box 6 is equipped with multiple sets of tension sensors 42 via multiple sets of connecting rods. The top of the feeding pipe 8 is connected to an electric feeding valve (not shown in the figure, same in the text). The transfer hopper 41 is located between the electric feeding valve and the solenoid valve 9. The upper end of the transfer hopper 41 is connected to multiple sets of tension sensors 42 via multiple sets of steel wire ropes. The top of the reduction tank 1 is also equipped with a PLC controller (not shown in the figure, same in the text) and an alarm (not shown in the figure, same in the text).

[0056] To prevent the solid granules and powdered reducing agent stored in storage tank 6 from getting damp due to the opening and closing of the feeding pipe 8, the electric feeding valve can be opened to first feed a portion of the powdered reducing agent from storage tank 6 into the transfer hopper 41. Multiple sets of tension sensors measure the mass change in the transfer hopper 41 and transmit the data to the PLC controller. When the weight in the transfer hopper 41 reaches the preset value, the PLC controller controls the electric feeding valve to close and stop feeding into the transfer hopper 41. Afterwards, when it is necessary to feed the powdered reducing agent into the weighing tank 11, the solenoid valve 9 is opened. The powdered reducing agent in the transfer hopper 41 is fed into the pre-weighing box 11 through the feeding pipe 8. During this process, the PLC controller sends the initial and final mass changes of the transfer hopper 41 detected by the tension sensor 42 to the external control system. The external control system compares the mass of the reducing agent corresponding to the volume change of the weighing box 11 with the mass of the reducing agent detected by the weighing device 10. When the mass comparison error of the three exceeds the preset range, an alarm can be triggered to remind the staff to troubleshoot the problem, thus further ensuring the weighing accuracy of the reducing agent.

[0057] In summary, compared with existing technologies, this utility model has a high degree of automation and advantages such as low labor intensity, high accuracy of reducing agent dosing, and low cost. Through the inlet 2, reduction tank 1, and arsenic analyzer 18, it automatically detects the arsenic content in the arsenic sulfide slag. Through the weighing box 11, automatic adjustment mechanism, storage tank 6, level gauge 14, solenoid valve 9, and discharge pipe 8, based on the detected arsenic content, the corresponding preset reducing agent mass is obtained from the external control system. Using the automatic adjustment mechanism, the storage volume in the weighing box 11 is adjusted to the volume required for the coarse adjustment of the reducing agent dosing mass. Then, the solenoid valve 9 is activated, and the reducing agent in the storage tank 6 falls into the weighing box 11 through the discharge pipe 8 until the level gauge 14 detects a full signal and sends it to the external control system, thus achieving the initial weighing of the reducing agent mass. Through the conveying mechanism, drive component 15, and movable... Plate 13 transports the weighing box 11 containing the weighed reducing agent to the top of the feed pipe 5 of the reduction tank 1 or the feed inlet 16 of the storage tank. Then, the driving component 15 drives the movable plate 13 to open the bottom of the weighing box 11. Under the action of gravity, the reducing agent in the weighing box 11 falls into the reduction tank 1 or the storage tank 7, which plays the role of automatically transporting and dispensing the weighed reducing agent. The lifting mechanism 19 and the weighing device 10 are used to weigh the mass of the fine-tuned reducing agent that falls into the weighing box 11. When the mass of the reducing agent in the weighing box 11 detected by the weighing device 10 reaches the corresponding fine-tuned mass value, the external control system controls the solenoid valve 9 to close. When it is necessary to use the reducing agent in the proportioned solution, the powdered reducing agent is weighed and dispensed in the same way as above. Then, the flow meter is used to control the amount of water or liquid injected into the storage tank 7 through the water inlet pipe 17.

[0058] The device boasts a high degree of automation, utilizing a combination of weighing box 11, automatic adjustment mechanism, lifting mechanism 19, and weighing device 10 to perform pre- and post-coarse and fine-tuning of the reducing agent. This ensures precise control of the reducing agent dosage based on real-time arsenic content monitoring. Furthermore, the powder reducing agent conveying system employs an open conveying method, avoiding the problems associated with traditional integrated pipelines, such as inconvenience in cleaning, susceptibility to moisture in the storage tank 7, and the high cost of multiple sets of equipment. It is suitable for adding both powdered and liquid reducing agents.

[0059] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A treatment device for recovering arsenic from arsenic sulfide slag, characterized in that: The system includes a reduction tank with inlets and outlets, each equipped with a valve, on both sides. The top of the tank is connected to an inlet pipe and a feed pipe, both also equipped with valves. Above the reduction tank are a storage tank and a liquid storage tank. The bottom of the storage tank is connected to a discharge pipe equipped with a solenoid valve. Below the discharge pipe are a weighing device and a weighing box whose top end contacts the bottom end of the discharge pipe. One top of the weighing box has a receiving port, and the other side has an automatic adjustment mechanism for adjusting its storage capacity. The bottom plate of the weighing box is a movable plate with a level gauge inside. A drive unit for opening and closing the movable plate is connected to the outside of the weighing box. The top of the liquid storage tank has an inlet with a valve and a water inlet pipe with a flow meter, and its bottom is connected to the inlet pipe. The top of the reduction tank is equipped with an arsenic analyzer with a probe located inside the tank, a lifting mechanism for raising and lowering the weighing device, and a conveying mechanism for transporting the weighing box to the feed pipe and above the inlet.

2. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: The conveying mechanism includes a turntable and a rotary drive device for driving the turntable to rotate. The turntable is mounted on top of the reduction tank. Both sides of the bottom of the weighing box have outwardly extending connecting parts. The connecting parts are detachably connected to the upper end face of the turntable by bolts. The upper end face of the turntable has a through hole for material to be discharged from the bottom of the weighing box. The cross-section of the through hole is larger than the cross-section of the bottom opening of the weighing box and smaller than the cross-section of the feed inlet and the feed pipe. The discharge pipe is located above the turntable, and the feed pipe and the feed inlet are located below the turntable. The discharge pipe, the feed pipe and the feed inlet are arranged sequentially along the conveying direction of the turntable.

3. The arsenic recovery treatment device for arsenic sulfide slag according to claim 2, characterized in that: The driving component is a rotary motor. A rotating shaft is fixedly connected to one side of the movable plate. The bottom side of the weighing box is rotatably connected to both ends of the rotating shaft. The movable plate is located inside the through hole. The driving end of the rotary motor is fixedly connected to one end of the rotating shaft and is used to drive the movable plate to rotate downwards by 90° inside the through hole until the other side of the movable plate rotates into the feed inlet or feed pipe.

4. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: A baffle is connected to the bottom side of the storage tank and the top of the liquid storage tank. The baffle extends along the conveying direction of the conveying mechanism. The baffle is located above the weighing tank and is used to prevent foreign objects from entering the receiving port or powdered reducing agent from overflowing out of the receiving port.

5. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: The automatic adjustment mechanism includes an adjustment plate, a threaded rod, a set of guide rods, a sliding plate located on the other side of the weighing box, a stepper motor, and a support. The support is U-shaped, with its two vertical ends connected to the other side of the weighing box. The two ends of the threaded rod are rotatably connected to the horizontal end of the support and the other side of the weighing box, respectively. The stepper motor is fixedly installed on the horizontal end of the support and is used to drive the threaded rod to rotate. The sliding plate is threadedly connected to the threaded rod and is located between the horizontal end of the support and the other side of the weighing box. The adjustment plate is located inside the other side of the weighing box, and its side closest to the support is fixedly connected to the sliding plate through the guide rod. A guide hole is provided on the other side of the weighing box for the guide rod to pass through. A material cavity is formed between the other side of the adjustment plate and the five sides of the weighing box away from the support.

6. The arsenic recovery treatment device for arsenic sulfide slag according to claim 5, characterized in that: The remaining four sides of the adjustment plate are fitted to the inner wall of the weighing box and are embedded with sealing gaskets.

7. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: The weighing boxes are provided in several quantities and are used for powder reducing agents of different densities. The outer length, width and height of each weighing box are the same, and the maximum capacity of each weighing box is different. Each weighing box is equipped with the automatic adjustment mechanism, and the conveying end of the conveying mechanism is detachably connected to the weighing box.

8. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: The reduction tank, the liquid storage tank, and the material storage tank are all equipped with automatic stirring devices.

9. The arsenic recovery treatment device for arsenic sulfide slag according to claim 1, characterized in that: The arsenic analyzer is an X-ray fluorescence spectrometer.

10. A treatment device for arsenic recovery from arsenic sulfide slag according to claim 1, characterized in that: The weighing device includes a tray and a strain gauge load cell, wherein the strain gauge load cell is embedded in the tray.

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