Acid leaching device for purifying quartz sand by iterative hydrothermal method

Abstract

The utility model discloses an acid leaching device for purifying quartz sand by an iterative hydrothermal method, and relates to the technical field of quartz sand purification. The device comprises a base, a top plate, a rotating plate, an acid pickling cylinder, a cleaning cylinder, a side cylinder, a hollow frame and an adjusting plate, the upper ends of the acid pickling cylinder and the cleaning cylinder are connected with a flow guide disc, processing cavities are formed in the acid pickling cylinder and the cleaning cylinder, the outer wall of the hollow frame is sleeved with a spiral track, and the upper end of the cleaning cylinder of the acid pickling cylinder is provided with a supporting block; side grooves are formed in the pickling cylinder and the cleaning cylinder, side cylinders are mounted in the side grooves, second rotating seats are arranged on the inner walls of the upper ends of the side cylinders, rotating shafts are mounted in the second rotating seats, check blocks are arranged on the outer walls of the rotating shafts, and side rings are arranged on the inner walls of the hollow frames. And the outer side of the rotating shaft is sleeved with a torsional spring. Through the arrangement of the annular flow guide disc and the liquid throwing structure in mechanical linkage operation, the problems of acid liquid recovery rate and later cleaning strength are solved.

Description

Technical Field

[0001] This utility model relates to the field of quartz sand purification technology, and in particular to an acid leaching device for purifying quartz sand using an iterative hydrothermal method. Background Technology

[0002] Quartz sand is a key raw material in photovoltaics, semiconductors, glass and other fields, and its purity and SiO2 content directly affect product performance. Traditional purification processes such as acid washing, magnetic separation and flotation are difficult to completely remove inclusions, gaseous and liquid impurities and trace metal oxides such as Fe and Al from quartz sand. The iterative hydrothermal acid leaching device combines hydrothermal reaction and acid leaching process to achieve deep purification through multi-stage cyclic treatment.

[0003] Chinese patent discloses an acid leaching device for purifying quartz sand using an iterative hydrothermal method (authorization announcement number CN221983335U). This patented technology includes a purification tank, an acid leaching mechanism, an overflow prevention mechanism, and a cleaning mechanism. The acid leaching mechanism is located on one side of the acid leaching tank. The overflow prevention mechanism includes a groove, a liquid collection tank, a first recovery pipe, and a recovery box. A groove is located on one side of the purification tank, and a liquid collection tank is located on one side of the bottom of the purification tank. The liquid collection tank is connected to the groove pipe, and the first recovery pipe is connected below the liquid collection tank. A recovery box is located at the bottom of the purification tank, and the lower end of the first recovery pipe is connected to the recovery box. The groove corresponds to the position of the acid leaching mechanism. A cleaning mechanism is located on the other side of the purification tank. This invention effectively prevents acid overflow during acid leaching by using a groove in the acid leaching tank and a first recovery pipe to collect overflowing acid into the recovery box. A water pump sends water from the tank to a spray pipe, which sprays water from the nozzles to clean the quartz sand within the perforated frame, effectively cleaning the acid adhering to the quartz sand.

[0004] However, this patent still has shortcomings. While it has advantages in design such as preventing acid spillage and cleaning the acid-washed quartz sand to reduce acid content, during use, the hollow frame moves up and down, and during the rotation path, acid still drips from the hollow frame into the environment, resulting in waste and contamination of the processing environment. Therefore, those skilled in the art have provided an iterative hydrothermal acid leaching device for purifying quartz sand to solve the problems mentioned in the background. Utility Model Content

[0005] Technical solution

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to an acid leaching device for purifying quartz sand using an iterative hydrothermal method. It includes a base, a top plate, a rotating plate, an acid washing cylinder, a washing cylinder, side cylinders, and a perforated frame. The acid washing cylinder and the washing cylinder are mounted on the upper end of the base. Annular guide plates are connected to the upper openings of both the acid washing cylinder and the washing cylinder. Both the acid washing cylinder and the washing cylinder have processing chambers inside, and each processing chamber has a perforated frame inside. A spiral track is fitted onto the outer wall of the perforated frame. A support block is provided on one side of the upper end of the washing cylinder. One end of the support block is rotatably mounted with a ball bearing that is rolled inside the spiral track. Both the pickling cylinder and the cleaning cylinder have side grooves located outside the processing chamber. Side cylinders are slidably mounted inside the side grooves. The upper inner wall of the side cylinder is provided with symmetrically distributed rotating seats. A rotating shaft is rotatably mounted inside the rotating seat. A stop is provided on the outer wall of the rotating shaft. A side ring located below the stop is provided on the inner wall of the hollow frame. A torsion spring is sleeved on the outer side of the rotating shaft, with its two ends connected to the rotating seat and the stop, respectively.

[0008] Furthermore, the upper end of the base is provided with symmetrically distributed hydraulic rods, the upper end of the hydraulic rods is provided with a top plate, the lower end of the top plate is provided with a motor, the lower end of the motor is provided with a rotating plate, the lower end of the rotating plate is provided with an adjusting plate, the lower end of the adjusting plate is provided with a bearing seat, the bearing seat is rotatably mounted with a connecting rod connected to the lower inner wall of the hollow frame, and the lower end of the stop block is rotatably mounted with a ball bearing.

[0009] Specifically, the hydraulic rod drives the top plate to rise, and the motor drives the rotating plate to rotate, so that the hollow frame can move longitudinally and rotate, switching between the cleaning tank and the pickling tank.

[0010] Furthermore, a rotating seat is rotatably mounted on one side of the lower end of the rotating plate, and one end of the adjusting plate is rotatably mounted to the rotating seat. A transversely distributed insertion hole is opened on one end of the adjusting plate, and a guide plate is provided at the lower end of the rotating plate. An insertion shaft with one end located inside the insertion hole is slidably inserted into the guide plate.

[0011] Specifically, the hollow frame is supported by a rotating seat and fixed at one end by a shaft. When the shaft is removed from the insertion hole, the hollow frame rotates and tilts, making it easier to pour out the quartz sand inside.

[0012] Furthermore, a handle is provided at one end of the insertion shaft, a limit ring is sleeved on the outer wall of the insertion shaft, and a spring sleeved on the outside of the insertion shaft is provided between the limit ring and the guide plate;

[0013] Specifically, the insertion shaft is used by gripping the handle. During use, the elastic force of the spring acts on the insertion shaft through the limiting ring, so that the insertion shaft is elastically supported in the insertion hole.

[0014] Furthermore, the lower end of the washing cylinder of the pickling cylinder is provided with a recovery chamber, the inner wall of the recovery chamber is provided with a semi-circular filter screen, a valve port is provided between the processing chamber and the recovery chamber, and a flow channel is connected between the side groove and the recovery chamber;

[0015] Specifically, the valve is controlled to open and close by a solenoid valve. After the pickling solution and cleaning water are used, they enter the corresponding recovery chamber through the valve for waste liquid recovery. The filter screen intercepts particulate matter present during the pickling and cleaning process to prevent it from entering the pump system.

[0016] Furthermore, one end of the pickling cylinder is provided with a reflux pump for the internal processing chamber of the pickling cylinder, and the output end of the reflux pump is provided with a reflux pipe located at the upper opening of the processing chamber. Each inner wall of one side of the processing chamber is provided with an inspection port communicating with the outside, and a maintenance plate fixed with screws is provided at the opening of the inspection port.

[0017] Specifically, the pickling solution is returned to the processing chamber inside the pickling tank via a reflux pump and reflux pipe. The filter screen is maintained through the inspection port, and the inspection plate controls the opening and closing of the inspection port.

[0018] Furthermore, the upper end of the cleaning cylinder of the pickling cylinder is provided with a horn-shaped inverted horn, the upper end of the base (1) is provided with a water tank, and the cleaning chamber inside the cleaning tank is provided with a cleaning component that communicates with the water tank. The cleaning component includes a water pump whose suction end is connected to the water tank, a cleaning pipe that is connected to the output end of the water pump and located inside the side of the processing chamber, and a cleaning nozzle that is connected to the cleaning pipe.

[0019] Specifically, the liquid overflowing from the treatment chamber is intercepted through the flared end, and the water tank provides rinsing water to the cleaning components. The water is then delivered through the cleaning pipe and cleaning nozzle to rinse the hollow frame and the quartz sand inside.

[0020] Beneficial effects

[0021] Compared with existing technologies, the advantages of this utility model are:

[0022] This invention follows the existing technology of placing quartz sand inside a hollow frame for acid washing and rinsing. An annular guide plate is set on the rotation path so that the dripping acid will flow back, preventing the acid from continuously dripping to the outside during the rotation. At the same time, a spiral track is fitted on the outer wall of the hollow frame. During the lifting process, it is squeezed by the positioning and installed ball bearings, which causes the hollow frame platform to rotate during the lifting process, thereby generating centrifugal force to throw most of the acid inside the hollow frame to the outside, improving the acid recovery rate.

[0023] Simultaneously, when the perforated frame is in operation, the linkage side cylinder rises synchronously to intercept the splashed acid, preventing it from entering the outside. After reaching the maximum lifting height, the side cylinder outside the perforated frame automatically descends, overcoming the elastic support of the torsion spring. The ball bearings disengage from the spiral track, and the rotation path of the perforated frame becomes unobstructed, ensuring the subsequent rinsing process. This optimizes the processing technology, improves acid recovery efficiency, improves the processing environment, and reduces cleaning work.

[0024] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front-view three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the main sectional three-dimensional structure of this utility model;

[0028] Figure 3 This is a three-dimensional cross-sectional view of the recovery chamber of this utility model;

[0029] Figure 4 This is a three-dimensional cross-sectional view of the processing cavity of this utility model;

[0030] Figure 5 This is a front-view three-dimensional structural diagram of the hollow frame of this utility model;

[0031] Figure 6 This is a front-view three-dimensional structural diagram of the insert shaft of this utility model;

[0032] Figure 7 This is a front-view three-dimensional structural diagram of the stop block of this utility model;

[0033] Figure 8 This is a front-view three-dimensional structural diagram of the ball bearing of this utility model.

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 1. Base; 2. Hydraulic rod; 3. Top plate; 4. Motor; 5. Rotating plate; 6. Pickling cylinder; 7. Cleaning cylinder; 8. Water tank; 9. Guide plate; 10. Side cylinder; 11. Hollow frame; 12. Processing chamber; 13. Support block; 14. Side groove; 15. Valve port; 16. Flow channel; 17. Inspection port; 18. Filter screen; 19. Return pump; 20. Return pipe; 21. Recovery chamber; 22. Trumpet mouth; 23. Spiral track; 24. Connecting rod; 25. Rotating seat one; 26. Adjusting plate; 27. Bearing seat; 28. Insert shaft; 29. ​​Insertion hole; 30. Limiting ring; 31. Handle; 32. Guide plate; 33. Spring; 34. Side ring; 35. Torsion spring; 36. Rotating shaft; 37. Rotating seat two; 38. Stop block; 39. Ball bearing one; 40. Ball bearing two. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0040] Example

[0041] Please see Figure 1-8As shown, this embodiment is an acid leaching device for purifying quartz sand using an iterative hydrothermal method. It includes a base 1, a top plate 3, a rotating plate 5, an acid washing cylinder 6, a cleaning cylinder 7, side cylinders 10, and a perforated frame 11. The acid washing cylinder 6 and the cleaning cylinder 7 are mounted on the upper end of the base 1. Annular guide plates 9 are connected to the upper openings of the acid washing cylinder 6 and the cleaning cylinder 7. Both the acid washing cylinder 6 and the cleaning cylinder 7 have processing chambers 12 inside, and each processing chamber 12 has a perforated frame 11 inside. A spiral track 23 is fitted onto the outer wall of the perforated frame 11. A support block 13 is mounted on one side of the upper end of the cleaning cylinder 7 of the acid washing cylinder 6. 13 has a ball bearing 40 that is rotatably mounted on one end and rolled inside the spiral track 23. Both the pickling cylinder 6 and the cleaning cylinder 7 have side grooves 14 located outside the processing chamber 12. Side cylinders 10 are slidably mounted inside the side grooves 14. The upper inner wall of the side cylinder 10 is provided with symmetrically distributed rotating seats 37. A rotating shaft 36 is rotatably mounted inside the rotating seat 37. A stop block 38 is provided on the outer wall of the rotating shaft 36. A side ring 34 located below the stop block 38 is provided on the inner wall of the hollow frame 11. A torsion spring 35 is sleeved on the outer side of the rotating shaft 36, with both ends connected to the rotating seat and the stop block 38 respectively.

[0042] The upper end of the base 1 is provided with symmetrically distributed hydraulic rods 2, the upper end of the hydraulic rods 2 is provided with a top plate 3, the lower end of the top plate 3 is provided with a motor 4, the lower end of the motor 4 is provided with a rotating plate 5, the lower end of the rotating plate 5 is provided with an adjusting plate 26, the lower end of the adjusting plate 26 is provided with a bearing seat 27, the bearing seat 27 is rotatably installed with a connecting rod 24 connected to the lower inner wall of the hollow frame 11, and the lower end of the stop block 38 is rotatably installed with a ball bearing 39.

[0043] A rotating seat 25 is rotatably mounted on one side of the lower end of the rotating plate 5. One end of the adjusting plate 26 is rotatably mounted to the rotating seat 25. One end of the adjusting plate 26 is provided with horizontally distributed insertion holes 29. A guide plate 32 is provided at the lower end of the rotating plate 5.

[0044] A shaft 28 with one end located inside the insertion hole 29 is slidably inserted into the guide plate 32. A handle 31 is provided at one end of the shaft 28. A limit ring 30 is sleeved on the outer wall of the shaft 28. A spring 33 sleeved on the outside of the shaft 28 is provided between the limit ring 30 and the guide plate 32.

[0045] The washing cylinder 7 of the pickling cylinder 6 is provided with a recovery chamber 21 at the lower end. The inner wall of the recovery chamber 21 is provided with a semi-circular filter screen 18. A valve port 15 is provided between the processing chamber 12 and the recovery chamber 21. A flow channel 16 is connected between the side groove 14 and the recovery chamber 21.

[0046] A reflux pump 19 is provided at one end of the pickling cylinder 6 to the internal processing chamber 12 of the pickling cylinder 6. A reflux pipe 20 is provided at the output end of the reflux pump 19 at the upper opening of the processing chamber 12. An inspection port 17 communicating with the outside is provided on one side of the inner wall of the processing chamber 12. An inspection plate fixed with screws is provided at the opening of the inspection port 17.

[0047] The upper end of the cleaning cylinder 7 of the pickling cylinder 6 is provided with a horn mouth 22 in the shape of an inverted horn. The upper end of the base (1) is provided with a water tank 8. The cleaning chamber 12 inside the cleaning tank is provided with a cleaning component that communicates with the water tank 8. The cleaning component includes a water pump whose suction end is connected to the water tank 8, a cleaning pipe that is connected to the output end of the water pump and located inside the side of the processing chamber 12, and a cleaning nozzle that is connected to the cleaning pipe.

[0048] In this embodiment, the quartz sand to be treated is loaded into the hollow frame 11, and the hydraulic rod 2 drives the top plate 3 to move down, so that the hollow frame 11 is immersed in the treatment chamber 12 of the pickling cylinder 6. The connecting rod 24 rotates through the bearing seat 27, so that the second ball 40 enters the spiral track 23. During the descent of the hollow frame 11, the second ball 40 enters the upper end of the spiral track 23. The hydraulic rod 2 drives the hollow frame 11 to move longitudinally repeatedly. Through the cooperation of the spiral track 23 and the second ball 40, the rotating acid of the hollow frame 11 fully acts on the quartz sand inside the hollow frame 11. The second ball 40 rolls along the spiral track 23, forcing the hollow frame 11 to rotate, forming a compound rotational motion, so that the acid fully penetrates the gaps of the quartz sand.

[0049] After pickling, the hydraulic rod 2 lifts the top plate 3. During the rise of the hollow frame 11, the spiral track 23 and the second ball 40 maintain the rotation state. The centrifugal force throws the residual acid in the pores to the inner wall of the treatment chamber 12. The side cylinder 10 rises synchronously with the hollow frame 11. Its inner wall block 38 is tightly attached to the outer wall of the hollow frame 11 under the action of the torsion spring 35, forming a dynamic sealed chamber to intercept splashed acid. When the hollow frame 11 is raised to the limit height, the side cylinder 10 slides down the side groove 14 under the action of gravity. The second ball 40 is separated from the spiral track 23. When the side ring 34 passes the block 38, the friction and resistance of the contact surface are reduced by the first ball 39. The hollow frame 11 stops rotating. At this time, the valve port 15 is opened. The acid flows into the recovery chamber 21 after being filtered by the filter screen 18. The return pump 19 draws the acid to the top of the treatment chamber 12 for recycling.

[0050] Rotating plate 5 rotates 180° to transfer the hollow frame 11 to the cleaning cylinder 7. The cleaning component uses the cleaning nozzle to high-pressure rinse the quartz sand. The horn mouth 22 collects splash water and guides it into the water tank 8 to achieve water resource circulation. Pulling out the plug shaft 28 releases the locking of the adjusting plate 26. The hollow frame 11 tilts to pour out the quartz sand. Impurities intercepted by the filter screen 18 can be cleaned through the inspection port 17 to ensure long-term stable operation of the system. The rotational motion mode causes the acid to form turbulence between the quartz sand particles, which improves the efficiency compared to traditional static soaking. The mechanical coupling design of the spiral track 23 and the ball bearing 40 converts the vertical lifting motion into controllable rotation without the need for an additional drive source.

[0051] It is worth noting that both the pickling cylinder 6 and the washing cylinder 7 are equipped with drainage pipes that run through the recovery chamber 21 and are controlled by valves to discharge the waste liquid inside the recovery chamber 21. The linkage lifting mechanism between the side cylinder 10 and the hollow frame 11 forms a closed recovery space during the dehydration stage, which improves the acid recovery rate and reduces acid loss compared to open-type treatment. The semi-circular structure design of the filter screen 18 allows solid impurities to automatically settle to the bottom of the recovery chamber 21, avoiding mesh blockage. The stop block 38 driven by the torsion spring 35 provides pre-tightening force when the hollow frame 11 rotates, preventing the side cylinder 10 from accidentally falling off. When subjected to a lifting force greater than the torsional elastic force of the torsion spring 35 during unloading, the stop block 38 automatically deflects and unlocks, realizing a one-button tilting function. This improves the operation efficiency compared to the traditional threaded fixing method and solves the pain points of acid waste, environmental pollution, and cumbersome operation in the traditional quartz sand treatment process. The processing time per batch is shortened, making it suitable for the industrial production of photovoltaic-grade high-purity quartz sand.

[0052] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An acid leaching device for purifying quartz sand using an iterative hydrothermal method, comprising a base (1), a top plate (3), a rotating plate (5), an acid washing cylinder (6), a cleaning cylinder (7), a side cylinder (10), a hollow frame (11), and an adjusting plate (26), characterized in that: The base (1) is provided with an acid pickling cylinder (6) and a cleaning cylinder (7) at its upper end. A ring-shaped guide plate (9) is connected to the upper opening of the acid pickling cylinder (6) and the cleaning cylinder (7). Both the acid pickling cylinder (6) and the cleaning cylinder (7) have processing chambers (12) inside. Each processing chamber (12) has a hollow frame (11) inside. A spiral track (23) is fitted onto the outer wall of the hollow frame (11). A support block (13) is provided on one side of the upper end of the cleaning cylinder (7) of the acid pickling cylinder (6). A ball bearing (40) is rotatably mounted on one end of the support block (13) and is rolled inside the spiral track (23). Both the pickling cylinder (6) and the cleaning cylinder (7) have side grooves (14) located outside the processing chamber (12). Side cylinders (10) are slidably installed inside the side grooves (14). Symmetrically distributed rotating seats (37) are provided on the inner wall of the upper end of the side cylinders (10). A rotating shaft (36) is rotatably installed inside the rotating seats (37). A stop block (38) is provided on the outer wall of the rotating shaft (36). A side ring (34) located below the stop block (38) is provided on the inner wall of the hollow frame (11). A torsion spring (35) with its two ends connected to the rotating seat and the stop block (38) respectively is sleeved on the outer side of the rotating shaft (36).

2. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 1, characterized in that: The base (1) is provided with symmetrically distributed hydraulic rods (2) at the upper end, the hydraulic rods (2) are provided with a top plate (3) at the upper end, the top plate (3) is provided with a motor (4) at the lower end, the motor (4) is provided with a rotating plate (5) at the lower end, the rotating plate (5) is provided with an adjusting plate (26) below, the adjusting plate (26) is provided with a bearing seat (27) at the lower end, the bearing seat (27) is rotatably installed with a connecting rod (24) connected to the lower inner wall of the hollow frame (11), and the stop block (38) is rotatably installed with a ball bearing (39) at the lower end.

3. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 1, characterized in that: A rotating seat (25) is rotatably mounted on one side of the lower end of the rotating plate (5). One end of the adjusting plate (26) is rotatably mounted to the rotating seat (25). One end of the adjusting plate (26) is provided with horizontally distributed insertion holes (29). A guide plate (32) is provided at the lower end of the rotating plate (5).

4. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 3, characterized in that: The guide plate (32) has a sliding insertion shaft (28) with one end located inside the insertion hole (29). One end of the insertion shaft (28) is provided with a handle (31). A limit ring (30) is sleeved on the outer wall of the insertion shaft (28). A spring (33) is sleeved on the outside of the insertion shaft (28) between the limit ring (30) and the guide plate (32).

5. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 1, characterized in that: The washing cylinder (7) of the pickling cylinder (6) is provided with a recovery chamber (21) at the lower end. The inner wall of the recovery chamber (21) is provided with a semi-circular filter screen (18). A valve port (15) is provided between the processing chamber (12) and the recovery chamber (21). A flow channel (16) is connected between the side groove (14) and the recovery chamber (21).

6. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 1, characterized in that: The pickling cylinder (6) is provided with a reflux pump (19) for the internal processing chamber (12) of the pickling cylinder (6) at one end. The output end of the reflux pump (19) is provided with a reflux pipe (20) located at the upper opening of the processing chamber (12). The inner wall of one side of the processing chamber (12) is provided with an inspection port (17) communicating with the outside. The opening of the inspection port (17) is provided with a maintenance plate fixed by screws.

7. The acid leaching apparatus for iterative hydrothermal purification of quartz sand according to claim 1, characterized in that: The upper end of the cleaning cylinder (7) of the pickling cylinder (6) is provided with a horn mouth (22) in the shape of an inverted horn. The upper end of the base (1) is provided with a water tank (8). The cleaning chamber (12) inside the cleaning tank is provided with a cleaning component that communicates with the water tank (8). The cleaning component includes a water pump whose suction end is connected to the water tank (8), a cleaning pipe that is connected to the output end of the water pump and located inside the side of the processing chamber (12), and a cleaning nozzle that is connected to the cleaning pipe.

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