Multi-channel mixed acid dynamic feeding and proportioning device and control method

Abstract

The application discloses a kind of multi-channel mixed acid dynamic dosing proportioning device and control method, it is related to metal acid solution stirring mixing field, specifically including support frame and the proportioning barrel being installed in its inside, support frame is provided with driving motor, and the output end of driving motor is connected with lower drive shaft;The application is by cylinder control half-round plate and bowl-shaped plate form liquid storage groove, part of sulfuric acid flows into proportioning barrel through groove strip, while stirring rod is premixed to metal powder and catalyst, and the uniform adhesion of catalyst on the surface of powder is enhanced, the synergistic effect of bowl-shaped plate and circular screen is controlled by cylinder extension and contraction, metal powder is centrifuged into proportioning barrel in two times, and the residual powder is flushed by using remaining sulfuric acid, which avoids local concentration caused by one-time feeding of metal, and batch feeding significantly reduces the intensity of reaction heat release, combined with mechanical type phased mixing, effectively avoids the risk of violent heat release caused by reaction of sulfuric acid and metal.

Description

Technical Field

[0001] The present invention relates to the technical field of stirring and mixing of metal acid solutions, and more particularly to a multi-channel mixed acid dynamic feeding and proportioning device and a control method thereof. Background Art

[0002] Manganese sulfate, nickel sulfate, and iron sulfate are raw materials for lithium batteries. The preparation method is to add the above raw materials and sulfuric acid solution into a mixing container and mix them thoroughly. However, due to the large specific gravity of most metals, the metal raw materials accumulate at the bottom of the container after being added to the mixing container. It is difficult to stir the metal raw materials using direct mechanical stirring, and the mixing with the acid solution is not sufficient, which is not conducive to the mixing reaction.

[0003] For example, the patent document for a mixing mechanism for continuously producing a metal acid solution, disclosed in publication number CN117643837B, controls the metal raw materials to disperse and evenly fall along the discharge gap of a material storage box. During the falling process, the stirring blades drive the acid liquid to rotate, making it easier for the acid liquid to suspend the dispersed metal raw materials, greatly improving the mixing degree of the metal raw materials and the acid liquid, and improving the mixing efficiency.

[0004] However, the aforementioned patent document describes continuously adding metal powder to the mixing vessel to mix it with sulfuric acid. However, if metal powder is continuously added to the mixing vessel, a large amount of metal will come into instantaneous contact with the sulfuric acid solution, resulting in a rapid and intense reaction, generating a large amount of heat and hydrogen, which may cause local overheating and affect the normal progress of the reaction.

[0005] In the conventional mixing process, the mixing reaction can be promoted by adding a catalyst. It is impossible to mix the catalyst and metal powder in advance to change the electronic structure and chemical properties of the metal powder surface and increase the active sites of the metal powder, thereby accelerating the mixing reaction rate. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-channel mixed acid dynamic feeding and proportioning device and a control method.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a multi-channel mixed acid dynamic feeding and proportioning device, comprising a support frame and a proportioning barrel installed therein, wherein a drive motor is provided on the support frame, an output end of the drive motor is connected to a lower drive shaft, a top of the lower drive shaft extends into the proportioning barrel and is provided with a proportioning feeding assembly for dynamically feeding the mixed acid raw materials;

[0008] The proportioning and feeding assembly includes a concave circular plate fixedly connected to the inner top wall of the proportioning barrel, an upper drive shaft connected to the top of the lower drive shaft is provided at the center of the concave circular plate, a mounting groove is provided above the inner wall of the upper drive shaft, a cylinder is provided in the mounting groove, and a lifting shaft is connected to the top of the cylinder to slide with the mounting groove;

[0009] A bowl-shaped plate is connected to the top of the upper drive shaft, and a circular screen for feeding the mixed acid powder raw material is provided on the outer wall of the upper side of the bowl-shaped plate. An outer convex circular plate 1 is rotatably provided on the circumferential top wall of the bowl-shaped plate, and the back of the outer convex circular plate 1 is fixedly connected to the inner wall of the proportioning barrel through a support rod. A plurality of groups of grooves are provided on the circumferential side wall of the outer convex circular plate 1, and a convex strip is provided on the outer wall of the lifting shaft that contacts the bowl-shaped plate, and the convex strip is engaged with the inner wall of the bowl-shaped plate.

[0010] Furthermore, a pressure sensor 1 for weighing the mixed acid powder raw material is provided on the top inner wall where the upper drive shaft contacts the bowl-shaped plate, and a convex circular plate 2 is installed on the bottom wall of the bowl-shaped plate, and the end of the convex circular plate 2 is arranged toward the concave circular plate.

[0011] Furthermore, a plurality of stirring rods for stirring the mixed acid powder raw material are staggered on the outer wall of the middle part of the lifting shaft, a semicircular plate is fixedly installed on the top of the lifting shaft, a blocking rod is fixed on the top of the semicircular plate, a blocking cone is fixed on the top of the blocking rod, and a drainage pipe for outputting the mixed acid liquid is provided on the outside of the blocking rod, and the blocking cone conflicts with the inner wall of the drainage pipe.

[0012] Furthermore, a liquid tank and a metal powder tank are respectively provided on both sides of the top wall of the mixing barrel, a liquid pump is installed on the top wall of the mixing barrel, a measuring tank is provided at the center of the top wall of the mixing barrel, and a pressure sensor 2 is provided on the top where the measuring tank is connected to the mixing barrel.

[0013] Furthermore, the input end of the drainage pipe passes through the proportioning barrel and is connected to the measuring tank, the input end of the liquid pump is connected to the liquid tank through a pipe, and the output end of the liquid pump is connected to the measuring tank through an infusion tube.

[0014] Furthermore, a catalyst tank is installed on the top wall of the proportioning barrel, and a powder conveying pump is arranged between the catalyst tank and the metal powder tank. The input end of the powder conveying pump is connected to a powder feeding pipe and a catalyst feeding pipe. The powder feeding pipe is connected to the metal powder tank, and the catalyst feeding pipe is connected to the catalyst tank, and a control valve is provided on the outer wall of the powder feeding pipe and the catalyst feeding pipe.

[0015] Furthermore, a powder discharge pipe is provided at the output end of the powder delivery pump, and the output end of the powder discharge pipe faces the gap between the semicircular plate and the bowl-shaped plate.

[0016] The present invention also provides a control method for a multi-channel mixed acid dynamic feeding and proportioning device, comprising the following steps:

[0017] S1: Metal powder feeding: Metal powder and catalyst are quantitatively discharged onto the bowl-shaped plate;

[0018] S2: Sulfuric acid feeding: Sulfuric acid is quantitatively delivered to the measuring tank through the infusion tube, and then the extended end of the cylinder is controlled to retract halfway. At this time, the semicircular plate and the bowl-shaped plate are fitted together, and a circular liquid storage groove is formed between the outer walls of the two. The stirring rod moves into the metal powder pile, and the discharge pipe is opened. A portion of the sulfuric acid is first discharged into the concave circular plate through multiple groups of grooves, and then into the proportioning barrel. At the same time, the drive motor controls the rotation of the upper and lower drive shafts to prepare for the mixing of the mixed acid raw materials and mix and stir the metal powder and catalyst inside the bowl-shaped plate to increase the active sites of the metal powder;

[0019] S3: Batch mixing: first control the extended end of the cylinder to extend upward, the discharge pipe is blocked and the convex strip is engaged with the bowl-shaped plate, the mixture of metal powder and catalyst inside the bowl-shaped plate performs centrifugal motion, and half of the metal powder is thrown into the top of the concave circular plate through the circular screen and discharged through the discharge port; then control the extended end of the cylinder to retract half downward, so that half of the remaining sulfuric acid is discharged into the concave circular plate, flushing the small amount of metal powder above the concave circular plate, and then entering the proportioning barrel through the discharge port for mixing; again control the extended end of the cylinder to extend upward and reset, centrifugally discharge the remaining metal powder and catalyst mixture, use the cylinder to retract, discharge the remaining sulfuric acid into the proportioning barrel, and discharge the small amount of metal powder and catalyst mixture remaining above the concave circular plate into the proportioning barrel, completing the dynamic batch loading of the mixed acid raw materials.

[0020] Technical effects and advantages of the present invention:

[0021] The present invention is to quantitatively deliver sulfuric acid into a measuring tank through an infusion tube, and then control the extended end of the cylinder to retract halfway. At this time, the semicircular plate and the bowl-shaped plate are in contact, and a circular liquid storage groove is formed between the outer walls of the two. The stirring rod is moved into the metal powder pile, and the discharge pipe is opened. A portion of the sulfuric acid is first discharged into the concave circular plate through multiple groups of grooves, and then into the proportioning barrel. At the same time, the drive motor controls the rotation of the upper drive shaft and the lower drive shaft to prepare for mixing the mixed acid raw materials, and mix and stir the metal powder and catalyst inside the bowl-shaped plate, thereby increasing the active sites of the metal powder and allowing the catalyst to evenly adhere to the surface of the metal powder. This adhesion changes the electronic structure and chemical properties of the metal powder surface, increases the active sites of the metal powder, and thus accelerates the mixing reaction rate of the catalyst and sulfuric acid.

[0022] The present invention controls the extended end of the cylinder to extend upward, the discharge pipe is blocked and the convex strip is engaged with the bowl-shaped plate, so that the mixture of metal powder and catalyst in the bowl-shaped plate performs centrifugal motion, and half of the metal powder is thrown into the concave gathering circular plate through the circular screen and discharged through the discharge port; then controls the extended end of the cylinder to contract downward by half, so that half of the remaining sulfuric acid is discharged into the concave gathering circular plate, flushing a small amount of metal powder above the concave gathering circular plate, and then entering the proportioning barrel through the discharge port for mixing; and controls the extended end of the cylinder to extend upward and reset again, centrifugally discharge the remaining metal powder and catalyst mixture, utilize the cylinder contraction to discharge the remaining sulfuric acid into the proportioning barrel, and discharge the small amount of metal powder and catalyst mixture remaining above the concave gathering circular plate into the proportioning barrel, and add the metal powder in batches to avoid the problem of local excessive concentration or uneven reaction caused by all-in addition, so that the metal powder and the sulfuric acid solution are more fully in contact and react, and the violent heat release caused by adding a large amount of metal powder at one time is avoided, thereby improving the operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional diagram of the appearance of the overall structure of the present invention.

[0024] Figure 2 It is a three-dimensional diagram of the external structure of the proportioning component in the present invention.

[0025] Figure 3 This is a front view of the internal structure of the proportioning barrel in the present invention.

[0026] Figure 4 It is a three-dimensional diagram of the overall structure of the proportioning component in the present invention.

[0027] Figure 5 It is a three-dimensional diagram of the blocking rod and the blocking cone in the present invention.

[0028] Figure 6 This is a front view of the structure of the multi-channel feeding part in the present invention.

[0029] Figure 7 It is a process flow chart of the present invention.

[0030] The accompanying drawings are:

[0031] 1. Support frame; 2. Proportioning barrel; 3. Proportioning feeding assembly; 31. Upper drive shaft; 32. Concave circular plate; 33. Convex circular plate 2; 34. Feeding port; 35. Cylinder; 36. Convex circular plate 1; 37. Grooved strips; 38. Bowl-shaped plate; 39. Circular screen; 310. Semicircular plate; 311. Lifting shaft; 312. Stirring rod; 313. Raised strips; 314. Blocking rod; 315. Blocking cone; 4. Drive motor; 41. Lower drive shaft; 42. Stirring plate; 5. Discharge pipe; 61. Liquid tank; 62. Liquid pump; 63. Infusion tube; 64. Measuring tank; 65. Catalyst tank; 66. Metal powder tank; 67. Powder delivery pump; 68. Powder discharge pipe; 69. Powder loading pipe; 610. Catalyst loading pipe. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1-Figure 7 As shown, the following solutions can be used to solve the problem of not being able to mix the catalyst and metal powder in advance to speed up the mixing reaction rate and continuously feeding the metal powder so that it mixes with sulfuric acid, causing local overheating and affecting the normal progress of the reaction;

[0034] A multi-channel mixed acid dynamic feeding and proportioning device in this embodiment includes a support frame 1 and a proportioning barrel 2 installed therein. A drive motor 4 is provided at the bottom of the support frame 1. The output end of the drive motor 4 is connected to a lower drive shaft 41. The top of the lower drive shaft 41 extends into the proportioning barrel 2 and is provided with a proportioning feeding component 3 for dynamically feeding the mixed acid raw materials.

[0035] It should be noted that: a plurality of stirring plates 42 are provided in a circular array on the outer wall of the lower driving shaft 41 for stirring the mixed liquid;

[0036] The proportioning and feeding assembly 3 includes a concave circular plate 32 fixedly connected to the inner top wall of the proportioning barrel 2. An upper drive shaft 31 connected to the top of the lower drive shaft 41 is provided at the center of the concave circular plate 32. A mounting groove is provided above the inner wall of the upper drive shaft 31. A cylinder 35 is provided in the mounting groove. A lifting shaft 311 that slides in the mounting groove is connected to the top of the cylinder 35. A bowl-shaped plate 38 is connected to the top of the upper drive shaft 31.

[0037] A pressure sensor 1 for weighing the mixed acid powder raw material is provided on the top inner wall where the upper drive shaft 31 contacts the bowl-shaped plate 38. A circular screen 39 for feeding the mixed acid powder raw material is provided on the upper outer wall of the bowl-shaped plate 38. An outer convex circular plate 1 36 is rotatably provided on the circumferential top wall of the bowl-shaped plate 38. The back of the outer convex circular plate 1 36 is fixedly connected to the inner wall of the proportioning barrel 2 via a support rod. Multiple groups of grooves 37 are provided on the circumferential side walls of the outer convex circular plate 1 36.

[0038] A plurality of groove strips 37 are arranged in a circular array relative to the center line of the outer convex circular plate 1 36;

[0039] A ridge 313 is provided on the outer wall of the lifting shaft 311 that contacts the bowl-shaped plate 38. The ridge 313 is engaged with the inner wall of the bowl-shaped plate 38.

[0040] The cylinder 35 is a standard actuator in the field of industrial automation. Its extension and contraction are usually achieved through a solenoid valve, PLC (programmable logic controller) or microcontroller. That is, after the solenoid valve receives an electrical signal from the PLC or controller, it switches the direction of the air path and drives the cylinder piston to move. In the present application, the cylinder 35 is installed in the mounting groove of the upper drive shaft 31. Its extension and contraction are achieved by an external control system (such as a PLC) sending a signal to the solenoid valve. By controlling the protruding end of the cylinder 35 to extend upward, the blocking cone 315 blocks the drain pipe. At this time, the ridge 313 engages with the middle part of the bowl-shaped plate 38. As the upper drive shaft 31 rotates, the bowl-shaped plate 38 rotates at high speed. The mixture of metal powder and catalyst inside the bowl-shaped plate 38 undergoes centrifugal motion and is thrown into the top of the concave circular plate 32 through the circular screen 39 and discharged through the discharge port 34.

[0041] A second convex circular plate 33 is mounted on the bottom wall of the bowl-shaped plate 38, with the end of the second convex circular plate 33 facing the concave circular plate 32. A plurality of stirring rods 312 for stirring the mixed acid powder raw material are staggered on the outer wall of the middle portion of the lifting shaft 311. A semicircular plate 310 is fixedly mounted on the top of the lifting shaft 311. A blocking rod 314 is fixedly mounted on the top of the semicircular plate 310. A blocking cone 315 is fixedly mounted on the top of the blocking rod 314. A drainage pipe for discharging the mixed acid liquid is disposed on the outer side of the blocking rod 314, and the blocking cone 315 contacts the inner wall of the drainage pipe.

[0042] The extended end of the control cylinder 35 is retracted halfway. At this time, the semicircular plate 310 and the bowl-shaped plate 38 are in contact with each other, and a circular liquid storage groove is formed between the outer walls of the two. The stirring rod 312 moves into the metal powder, and the blocking rod 314 drives the blocking cone 315 to move downward. The sulfuric acid falls onto the top of the semicircular plate 310 through the discharge pipe, and then flows through the multiple groups of grooves 37 on the outer convex circular plate 36 into the concave circular plate 32 and enters the mixing barrel 2.

[0043] A liquid tank 61 and a metal powder tank 66 are respectively provided on both sides of the top wall of the proportioning barrel 2. A liquid pump 62 is installed on the top wall of the proportioning barrel 2. A measuring tank 64 is provided at the center of the top wall of the proportioning barrel 2. A pressure sensor 2 is provided on the top where the measuring tank 64 is connected to the proportioning barrel 2. The pressure sensor is used to weigh the sulfuric acid liquid inside the proportioning barrel 2. The input end of the discharge pipe passes through the proportioning barrel 2 and is connected to the measuring tank 64. The input end of the liquid pump 62 is connected to the liquid tank 61 through a pipe 1, and the output end of the liquid pump 62 is connected to the measuring tank 64 through a liquid infusion pipe 63.

[0044] A catalyst tank 65 is also installed on the top wall of the proportioning barrel 2. A powder delivery pump 67 is provided between the catalyst tank 65 and the metal powder tank 66. The input end of the powder delivery pump 67 is connected to a powder feeding pipe 69 and a catalyst feeding pipe 610. The powder feeding pipe 69 is connected to the metal powder tank 66, and the catalyst feeding pipe 610 is connected to the catalyst tank 65. A control valve 1 is provided on the outer wall of the powder feeding pipe 69 and the catalyst feeding pipe 610.

[0045] The powder delivery pump 67 is controlled to deliver the metal powder in the metal powder tank 66 to the bowl-shaped plate 38 through the powder discharge pipe 68. The metal powder is weighed by the pressure sensor 1. At this time, the control valve 1 on the outer wall of the powder feeding pipe 69 is opened. After the quantitative feeding of the metal powder is completed, the feeding is stopped. Then the control valve 1 on the catalyst feeding pipe 610 is opened to complete the quantitative feeding of the catalyst.

[0046] The output end of the powder delivery pump 67 is provided with a powder discharge pipe 68 , and the output end of the powder discharge pipe 68 faces the gap between the semicircular plate 310 and the bowl-shaped plate 38 ;

[0047] A discharge pipe 5 is inserted below the proportioning barrel 2, and a control valve 2 is provided on the outer wall of the discharge pipe 5;

[0048] It should be noted that pressure sensor 1 and pressure sensor 2 are connected to an external weighing monitoring system to accurately monitor the weight ratio of sulfuric acid and metal powder.

[0049] Example 2: Please refer to Figure 1-Figure 7 As shown, a control method for a multi-channel mixed acid dynamic feeding and proportioning device includes the following steps:

[0050] Step 1: Metal powder discharge: Control the powder delivery pump 67 to deliver the metal powder in the metal powder tank 66 to the bowl-shaped plate 38 through the powder discharge pipe 68. The metal powder is weighed by the pressure sensor 1. At this time, the control valve 1 on the outer wall of the powder feeding pipe 69 is opened. After the quantitative feeding of the metal powder is completed, the feeding is stopped, and the control valve 1 on the catalyst feeding pipe 610 is opened to complete the quantitative feeding of the catalyst.

[0051] Step 2: Sulfuric acid discharge: Control the liquid pump 62 to transport the sulfuric acid in the liquid tank 61 into the measuring tank 64 through the liquid infusion tube 63. The sulfuric acid is weighed and measured by the second pressure sensor. After the sulfuric acid is quantitatively fed into the measuring tank 64, the extended end of the cylinder 35 is controlled to retract halfway. At this time, the semicircular plate 310 and the bowl-shaped plate 38 are in contact with each other, and a circular liquid storage groove is formed between the outer walls of the two. The stirring rod 312 moves into the metal powder, and the blocking rod 314 drives the blocking cone 315 to move downward. The sulfuric acid falls onto the top of the semicircular plate 310 through the discharge pipe, and then is discharged into the concave circular plate 32 through the multiple groups of groove strips 37 on the outer convex circular plate 1 36, and enters the proportioning barrel 2;

[0052] At the same time, the drive motor 4 controls the upper drive shaft 31 and the lower drive shaft 41 to rotate, preparing to stir the mixed acid raw materials. At this time, the stirring rod 312 rotates to mix and stir the metal powder and catalyst inside the bowl-shaped plate 38, allowing the catalyst to evenly adhere to the surface of the metal powder. This adhesion changes the electronic structure and chemical properties of the metal powder surface, increases the active sites of the metal powder, and thus accelerates the mixing reaction rate of the catalyst and sulfuric acid.

[0053] Step 3: Mix in batches:

[0054] S1: The extended end of the control cylinder 35 extends upward, and the blocking cone 315 blocks the drain pipe. At this time, the ridge 313 engages with the middle part of the bowl-shaped plate 38. As the upper drive shaft 31 rotates, the bowl-shaped plate 38 rotates at high speed. The mixture of metal powder and catalyst inside the bowl-shaped plate 38 undergoes centrifugal motion, is thrown through the circular screen 39, and is discharged above the concave circular plate 32 through the discharge port 34.

[0055] S2: After discharging part of the metal powder, such as half of the metal powder and catalyst mixture, the extended end of the cylinder 35 is again controlled to retract half downward, allowing part of the remaining sulfuric acid, such as half of the remaining sulfuric acid, to be discharged through the groove strips 37 onto the top of the concave gathering circular plate 32, thereby washing away a small amount of metal powder above the concave gathering circular plate 32, and then entering the proportioning barrel 2 through the discharge port 34 for mixing;

[0056] S3: The extended end of the cylinder 35 is again extended upward and reset, and the convex strip 313 engages with the bowl-shaped plate 38, and the remaining metal powder and catalyst mixture are completely centrifuged and discharged. The extended end of the cylinder 35 is retracted halfway downward, and the remaining sulfuric acid is completely discharged into the proportioning barrel 2. The small amount of metal powder and catalyst mixture remaining above the concave circular plate 32 is flushed and discharged into the proportioning barrel 2.

[0057] At this point, the metal powder, catalyst, and sulfuric acid are loaded in batches according to the above steps. Adding the metal powder in batches can avoid the problem of local excessive concentration or uneven reaction caused by adding all at once, allowing the metal powder and sulfuric acid solution to contact and react more fully, avoiding the violent heat release caused by adding a large amount of metal powder at one time, and improving operational safety.

[0058] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-channel mixed acid dynamic feeding and proportioning device, comprising a support frame (1) and a proportioning barrel (2) installed inside the support frame, characterized in that: A driving motor (4) is provided on the support frame (1), and an output end of the driving motor (4) is connected to a lower driving shaft (41). The top of the lower driving shaft (41) extends into the proportioning barrel (2) and is provided with a proportioning feeding component (3) for dynamically feeding the mixed acid raw material. The proportioning feeding assembly (3) includes a concave round plate (32) fixedly connected to the inner top wall of the proportioning barrel (2), an upper drive shaft (31) connected to the top of the lower drive shaft (41) is provided at the center of the concave round plate (32), a mounting groove is provided above the inner wall of the upper drive shaft (31), a cylinder (35) is provided in the mounting groove, and a lifting shaft (311) that is slidably matched with the mounting groove is connected to the top of the cylinder (35); The top of the upper driving shaft (31) is connected to a bowl-shaped plate (38), and a circular screen (39) for feeding the mixed acid powder raw material is provided on the outer wall of the upper side of the bowl-shaped plate (38). An outer convex circular plate (36) is rotatably provided on the circumferential top wall of the bowl-shaped plate (38), and the back of the outer convex circular plate (36) is fixedly connected to the inner wall of the proportioning barrel (2) through a support rod. A plurality of groups of grooves (37) are provided on the circumferential side wall of the outer convex circular plate (36), and a convex strip (313) is provided on the outer wall of the lifting shaft (311) in contact with the bowl-shaped plate (38), and the convex strip (313) is engaged with the inner wall of the bowl-shaped plate (38); A plurality of stirring rods (312) for stirring the mixed acid powder raw material are staggered on the outer wall of the middle part of the lifting shaft (311); a semicircular plate (310) is fixedly installed on the top of the lifting shaft (311); a blocking rod (314) is fixedly installed on the top of the semicircular plate (310); a blocking cone (315) is fixedly installed on the top of the blocking rod (314); a drainage pipe for outputting the mixed acid liquid is provided on the outer side of the blocking rod (314); the blocking cone (315) is in conflict with the inner wall of the drainage pipe; When the extended end of the control cylinder (35) is retracted, the semicircular plate (310) and the bowl-shaped plate (38) are fitted together, and a liquid storage circular groove is formed between the outer walls of the two. The stirring rod (312) moves into the metal powder pile, and the discharge pipe is opened. A portion of the sulfuric acid is first discharged into the concave circular plate (32) through the multiple groups of groove strips (37), and then enters the proportioning barrel (2). At the same time, the drive motor (4) controls the upper drive shaft (31) and the lower drive shaft (41) to rotate, preparing to mix the mixed acid raw materials and mix and stir the metal powder and catalyst inside the bowl-shaped plate (38); When the extended end of the control cylinder (35) extends upward, the drain pipe is blocked and the convex strip (313) is engaged with the bowl-shaped plate (38), and the mixture of metal powder and catalyst inside the bowl-shaped plate (38) undergoes centrifugal motion, and half of the metal powder is thrown into the top of the concave circular plate (32) through the circular screen (39).

2. A multi-channel mixed acid dynamic feeding and proportioning device according to claim 1, characterized in that: A pressure sensor for weighing the mixed acid powder raw material is provided on the top inner wall where the upper drive shaft (31) contacts the bowl-shaped plate (38), and a second convex circular plate (33) is installed on the bottom wall of the bowl-shaped plate (38), and the end of the second convex circular plate (33) is arranged toward the concave circular plate (32).

3. A multi-channel mixed acid dynamic feeding and proportioning device according to claim 2, characterized in that: A liquid tank (61) and a metal powder tank (66) are respectively provided on both sides of the top wall of the proportioning barrel (2), a liquid pump (62) is installed on the top wall of the proportioning barrel (2), a measuring tank (64) is provided at the center of the top wall of the proportioning barrel (2), and a second pressure sensor is provided on the top of the measuring tank (64) connected to the proportioning barrel (2).

4. A multi-channel mixed acid dynamic feeding and proportioning device according to claim 3, characterized in that: The input end of the liquid discharge pipe passes through the proportioning barrel (2) and is connected to the measuring tank (64); the input end of the liquid pump (62) is connected to the liquid tank (61) through a pipe 1; and the output end of the liquid pump (62) is connected to the measuring tank (64) through a liquid infusion pipe (63).

5. A multi-channel mixed acid dynamic feeding and proportioning device according to claim 4, characterized in that: A catalyst tank (65) is also installed on the top wall of the proportioning barrel (2), and a powder delivery pump (67) is provided between the catalyst tank (65) and the metal powder tank (66). The input end of the powder delivery pump (67) is connected to a powder feeding pipe (69) and a catalyst feeding pipe (610). The powder feeding pipe (69) is connected to the metal powder tank (66), and the catalyst feeding pipe (610) is connected to the catalyst tank (65). A control valve 1 is provided on the outer wall of each of the powder feeding pipe (69) and the catalyst feeding pipe (610).

6. A multi-channel mixed acid dynamic feeding and proportioning device according to claim 5, characterized in that: The output end of the powder delivery pump (67) is provided with a powder discharge pipe (68), and the output end of the powder discharge pipe (68) faces the gap between the semicircular plate (310) and the bowl-shaped plate (38).

7. A control method for a multi-channel mixed acid dynamic feeding and proportioning device, applied to a multi-channel mixed acid dynamic feeding and proportioning device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Metal powder feeding: Metal powder and catalyst are quantitatively discharged onto the bowl-shaped plate (38); S2: Sulfuric acid feeding: Sulfuric acid is quantitatively delivered to the measuring tank (64) through the infusion tube (63), and then the extended end of the cylinder (35) is controlled to retract half. At this time, the semicircular plate (310) and the bowl-shaped plate (38) are fitted together, and a liquid storage circular groove is formed between the outer walls of the two. The stirring rod (312) moves into the metal powder pile, and the discharge pipe is opened. A part of the sulfuric acid is first discharged into the concave circular plate (32) through the multiple groups of groove strips (37), and then enters the proportioning barrel (2). At the same time, the driving motor (4) controls the upper drive shaft (31) and the lower drive shaft (41) to rotate, preparing to mix the mixed acid raw materials, and mixing and stirring the metal powder and catalyst inside the bowl-shaped plate (38) to increase the active sites of the metal powder; S3: Batch mixing: First, the extended end of the cylinder (35) is controlled to extend upward, the discharge pipe is blocked and the convex strip (313) is engaged with the bowl-shaped plate (38), and the mixture of metal powder and catalyst inside the bowl-shaped plate (38) is subjected to centrifugal motion, and half of the metal powder is thrown into the concave round plate (32) through the circular screen (39) and discharged through the discharge port (34); then the extended end of the cylinder (35) is controlled to retract half downward, so that half of the remaining sulfuric acid is discharged into the concave round plate (32), and the mixture is discharged. A small amount of metal powder above the concave gathering circular plate (32) is washed away and then enters the proportioning barrel (2) through the discharge port (34) for mixing; the extended end of the cylinder (35) is controlled to extend upward and reset again, and the remaining metal powder and catalyst mixture are centrifugally discharged. The cylinder (35) is contracted to discharge the remaining sulfuric acid into the proportioning barrel (2), and the small amount of metal powder and catalyst mixture remaining above the concave gathering circular plate (32) is discharged into the proportioning barrel (2), thereby completing the dynamic batch feeding of the mixed acid raw material.

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