A device for concentrating a solution of zinc sulfate heptahydrate

Abstract

The application provides a zinc sulfate heptahydrate solution concentration device, and relates to the technical field of zinc sulfate heptahydrate solution concentration, which comprises a concentration heating cylinder; after concentration is completed, the solution can be kept warm to form crystals through the zinc sulfate heptahydrate solution concentration discharge assembly, the control electric telescopic rod drives the discharge baffle to slide after the crystallization is completed, the discharge baffle cancels the shielding of the concentration heating cylinder, the first motor can be started to drive the first lead screw to rotate, the first lead screw can drive the lifting plate to rise through thread cooperation after the first lead screw rotates, the lifting plate can drive the stirring rod to rise, a plurality of cleaning scraping holes on the movable disc can scrape the crystals on the stirring rod, and the second lead screw can be driven to rotate in the opposite direction through the transmission gear after the first lead screw rotates, the cleaning scraper can scrape the inner side wall of the concentration heating cylinder, the crystals can fall from the bottom of the concentration heating cylinder, and the staff can collect the crystals in the later stage.

Description

Technical Field

[0001] This utility model relates to the field of zinc sulfate heptahydrate solution concentration technology, and in particular to a zinc sulfate heptahydrate solution concentration device. Background Technology

[0002] Zinc sulfate heptahydrate is an inorganic compound, commonly known as zinc sulfate or zinc sulfate. It is a colorless, orthorhombic prismatic crystal, a white crystalline powder, soluble in water and slightly soluble in ethanol. It loses water when heated to 200°C and decomposes at 770°C. Ingestion of zinc sulfate heptahydrate is harmful, causing serious damage to the eyes and exhibiting extremely high toxicity to aquatic organisms, potentially having long-term adverse effects on the aquatic environment. Zinc sulfate heptahydrate is used as a mordant, wood preservative, bleaching agent in the paper industry, and also in pharmaceuticals, synthetic fibers, electrolysis, electroplating, pesticides, and the production of zinc salts. Existing concentration devices require heating to remove water from the zinc sulfate heptahydrate solution. During heating, a stirring device is needed to prevent crystallization and sticking to the walls. However, after concentration, the solution crystallizes, and the crystals adhere to the inner walls of the stirring and heating devices. This requires workers to use tools such as shovels to unload the crystals, which is cumbersome and inconvenient. Therefore, we propose a zinc sulfate heptahydrate solution concentration device. Utility Model Content

[0003] In view of this, this application provides a zinc sulfate heptahydrate solution concentration apparatus, which aims to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A zinc sulfate heptahydrate solution concentration device includes a concentration heating cylinder, a heating electrode fixedly installed on the right side of the concentration heating cylinder, a vacuum pump fixedly installed on the top of the concentration heating cylinder, the suction end of the vacuum pump being connected to the concentration heating cylinder, a steam conveying pipe fixedly installed at the output end of the vacuum pump, and a zinc sulfate heptahydrate solution concentration discharge assembly provided on the concentration heating cylinder. The zinc sulfate heptahydrate solution concentration and discharge assembly includes a fixed frame, a first motor, a first lead screw, a one-way lever, a lifting plate, a second motor, a turntable, and a stirring rod. The fixed frame is fixedly installed on the left side of the concentration heating cylinder. The first motor is fixedly installed on the top of the fixed frame. The first lead screw is fixedly installed on the output end of the first motor. The one-way lever is fixedly installed on the inner side of the fixed frame. The lifting plate is threaded onto the outer side of the first lead screw and slidably installed on the outer side of the one-way lever. The second motor is fixedly installed on the top of the lifting plate. The turntable is fixedly installed on the output end of the second motor. The stirring rod is fixedly installed on the bottom of the turntable.

[0005] Preferably, a support plate is fixedly installed on the right side of the concentration heating cylinder, a preheating cylinder is fixedly installed on the top of the support plate, the other end of the steam conveying pipe is fixedly installed on the inner side of the preheating cylinder, a zinc sulfate heptahydrate solution pH adjustment cylinder is fixedly installed on the inner side of the preheating cylinder, an inlet filter frame is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjustment cylinder, and a zinc sulfate heptahydrate solution concentration pretreatment component is provided on the preheating cylinder, the zinc sulfate heptahydrate solution pH adjustment cylinder, and the inlet filter frame.

[0006] Preferably, a movable disc is rotatably mounted on the top of the concentration heating cylinder, and the top of the movable disc has multiple cleaning scraping holes, with the stirring rod slidably mounted inside the cleaning scraping holes.

[0007] Preferably, the zinc sulfate heptahydrate solution concentration and discharge assembly further includes a second lead screw, a transmission gear, a limiting rod, a sliding plate, a slide rod, and a cleaning scraper. The second lead screw is rotatably mounted on the inner side of the fixed frame. The transmission gears are respectively fixedly mounted on the outer sides of the second lead screw and the first lead screw, with adjacent transmission gears meshing. The limiting rod is fixedly mounted on the inner side of the liquid inlet filter frame. The sliding plate is threaded onto the outer side of the second lead screw and slidably mounted on the outer side of the limiting rod. The slide rod is fixedly mounted on the bottom of the sliding plate. The cleaning scraper is fixedly mounted on the bottom of the slide rod and is in contact with the inner wall of the concentration heating cylinder.

[0008] Preferably, two support frames are fixedly installed at the bottom of the concentration heating cylinder, an electric telescopic rod is fixedly installed on the right side of the concentration heating cylinder, a discharge baffle is fixedly installed at the output end of the electric telescopic rod, a support guide hole is opened on one side of the support frame, the discharge baffle is slidably installed inside the support guide hole, and the top of the discharge baffle is in contact with the bottom of the concentration heating cylinder.

[0009] Preferably, the zinc sulfate heptahydrate solution concentration pretreatment assembly includes a drain pipe, a tail gas discharge pipe, a solenoid valve, a detachable filter plate, and fixing bolts. The drain pipe is fixedly installed inside the preheating cylinder, the tail gas discharge pipe is fixedly installed on the top of the preheating cylinder, the solenoid valve is fixedly installed on the outside of the drain pipe and the tail gas discharge pipe, and the detachable filter plate is installed on the liquid inlet filter frame by fixing bolts.

[0010] Preferably, the zinc sulfate heptahydrate solution concentration pretreatment assembly further includes a solution pH detection probe, a water pump, and a delivery pipeline. The solution pH detection probe is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjustment cylinder, the water pump is fixedly installed on the bottom of the zinc sulfate heptahydrate solution pH adjustment cylinder, the suction end of the water pump is connected to the zinc sulfate heptahydrate solution pH adjustment cylinder, one end of the delivery pipeline is fixedly installed on the output end of the water pump, and the other end of the delivery pipeline is fixedly installed on the inner side of the concentration heating cylinder.

[0011] Preferably, the preheating cylinder is covered with heat-insulating cotton, and the acid-base adjustment cylinder of the zinc sulfate heptahydrate solution is made of thermally conductive copper.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) A zinc sulfate heptahydrate solution concentration device of the present invention, through the zinc sulfate heptahydrate solution concentration discharge component, the solution can be kept warm to form crystals after concentration. After crystallization, the electric telescopic rod is controlled to drive the discharge baffle to slide, so that the discharge baffle can remove the obstruction of the concentration heating cylinder. The first motor can be controlled to start and drive the first screw to rotate. After the first screw rotates, it can drive the lifting plate to rise through the thread engagement. The lifting plate can drive the stirring rod to rise. Multiple cleaning scraping holes on the movable plate can scrape off the crystals on the stirring rod. After the first screw rotates, it can drive the second screw to rotate in the opposite direction through the transmission gear. After the second screw rotates, it can drive the sliding plate, sliding rod and cleaning scraper to fall through the thread engagement. The cleaning scraper can scrape off the inner wall of the concentration heating cylinder, so that the crystals can fall from the bottom of the concentration heating cylinder, which is convenient for the staff to collect later. (2) A zinc sulfate heptahydrate solution concentration device of the present invention uses a zinc sulfate heptahydrate solution concentration pretreatment component to filter the zinc sulfate heptahydrate solution through a detachable filter plate. The filtered solution can enter the interior of the zinc sulfate heptahydrate solution pH adjustment cylinder. The solution pH detection probe can detect the pH of the solution to avoid the zinc sulfate heptahydrate solution from hydrolyzing and generating zinc hydroxide precipitate during the concentration process, which would affect the concentration efficiency and crystal purity. Therefore, dilute sulfuric acid or zinc oxide needs to be added to adjust the pH value to 3-5. The water pump can be turned on to extract the solution and transfer it to the interior of the concentration heating cylinder through the liquid delivery pipeline. The heating electrode is turned on to heat the solution in the concentration heating cylinder. During the heating process, the solution will generate water vapor. The water vapor can be transferred to the preheating cylinder through the air pump and steam delivery pipeline. The water vapor can preheat the solution in the zinc sulfate heptahydrate solution pH adjustment cylinder.

[0013] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a zinc sulfate heptahydrate solution concentration device proposed in this utility model; Figure 2 A schematic diagram of a three-dimensional view of a zinc sulfate heptahydrate solution concentration apparatus provided according to an embodiment of this application is shown. Figure 3 A schematic diagram of the explosion section structure of a zinc sulfate heptahydrate solution concentration apparatus according to an embodiment of this application is shown; Figure 4 A schematic diagram of a three-dimensional view of a partial structure of a zinc sulfate heptahydrate solution concentration and pretreatment assembly provided according to an embodiment of this application is shown.

[0015] Figure label: 1. Zinc sulfate heptahydrate solution concentration and discharge assembly; 2. Zinc sulfate heptahydrate solution concentration and pretreatment assembly; 3. Concentration heating cylinder; 4. Heating electrode; 5. Vacuum pump; 6. Steam delivery pipeline; 7. Support plate; 8. Preheating cylinder; 9. Zinc sulfate heptahydrate solution pH adjustment cylinder; 10. Inlet filter frame; 11. Fixing frame; 12. First motor; 13. First lead screw; 14. One-way rod; 15. Lifting plate; 16. Second motor; 17. Turntable; 18. Stirring rod; 9. Movable disc; 20. Cleaning scraper hole; 21. Second lead screw; 22. Transmission gear; 23. Limiting rod; 24. Sliding plate; 25. Sliding rod; 26. Cleaning scraper; 27. Support frame; 28. Electric telescopic rod; 29. ​​Discharge baffle; 30. Support guide hole; 31. Drainage pipe; 32. Exhaust gas discharge pipe; 33. Solenoid valve; 34. Demountable filter plate; 35. Fixing bolt; 36. Solution pH detection probe; 37. Water pump; 38. Infusion pipeline. Detailed Implementation

[0016] To further understand the invention content, features and effects of this utility model, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings; The structure of this utility model will now be described in detail with reference to the accompanying drawings.

[0017] refer to Figure 1-4 A zinc sulfate heptahydrate solution concentration device includes a concentration heating cylinder 3, a heating electrode 4 fixedly installed on the right side of the concentration heating cylinder 3, a vacuum pump 5 fixedly installed on the top of the concentration heating cylinder 3, the suction end of the vacuum pump 5 being connected to the concentration heating cylinder 3, and a steam conveying pipe 6 fixedly installed at the output end of the vacuum pump 5. A zinc sulfate heptahydrate solution concentration discharge assembly 1 is provided on the concentration heating cylinder 3. The zinc sulfate heptahydrate solution concentration and discharge assembly 1 includes a fixed frame 11, a first motor 12, a first lead screw 13, a one-way rod 14, a lifting plate 15, a second motor 16, a turntable 17, and a stirring rod 18. The fixed frame 11 is fixedly installed on the left side of the concentration heating cylinder 3. The first motor 12 is fixedly installed on the top of the fixed frame 11. The first lead screw 13 is fixedly installed on the output end of the first motor 12. The one-way rod 14 is fixedly installed on the inner side of the fixed frame 11. The lifting plate 15 is threaded on the outer side of the first lead screw 13 and slidably installed on the outer side of the one-way rod 14. The second motor 16 is fixedly installed on the top of the lifting plate 15. The turntable 17 is fixedly installed on the output end of the second motor 16. The stirring rod 18 is fixedly installed on the bottom of the turntable 17.

[0018] In this embodiment, a support plate 7 is fixedly installed on the right side of the concentration heating cylinder 3, a preheating cylinder 8 is fixedly installed on the top of the support plate 7, the other end of the steam conveying pipe 6 is fixedly installed on the inner side of the preheating cylinder 8, a zinc sulfate heptahydrate solution pH adjusting cylinder 9 is fixedly installed on the inner side of the preheating cylinder 8, an inlet filter frame 10 is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjusting cylinder 9, and a zinc sulfate heptahydrate solution concentration pretreatment component 2 is provided on the preheating cylinder 8, the zinc sulfate heptahydrate solution pH adjusting cylinder 9, and the inlet filter frame 10.

[0019] In this embodiment, a movable disc 19 is rotatably mounted on the top of the concentration heating cylinder 3. The top of the movable disc 19 is provided with a plurality of cleaning scraping holes 20, and the stirring rod 18 is slidably mounted on the inner side of the cleaning scraping holes 20.

[0020] In this embodiment, the zinc sulfate heptahydrate solution concentration and discharge assembly 1 further includes a second lead screw 21, a transmission gear 22, a limiting rod 23, a sliding plate 24, a sliding rod 25, and a cleaning scraper 26. The second lead screw 21 is rotatably mounted on the inner side of the fixed frame 11. The transmission gear 22 is fixedly mounted on the outer side of the second lead screw 21 and the first lead screw 13, respectively, with adjacent transmission gears 22 meshing. The limiting rod 23 is fixedly mounted on the inner side of the liquid inlet filter frame 10. The sliding plate 24 is threadedly mounted on the outer side of the second lead screw 21 and slidably mounted on the outer side of the limiting rod 23. The sliding rod 25 is fixedly mounted on the bottom of the sliding plate 24. The cleaning scraper 26 is fixedly mounted on the bottom of the sliding rod 25 and is in contact with the inner wall of the concentration heating cylinder 3.

[0021] In this embodiment, two support frames 27 are fixedly installed at the bottom of the concentration heating cylinder 3, and an electric telescopic rod 28 is fixedly installed on the right side of the concentration heating cylinder 3. A discharge baffle 29 is fixedly installed at the output end of the electric telescopic rod 28. A support guide hole 30 is opened on one side of the support frame 27. The discharge baffle 29 is slidably installed inside the support guide hole 30. The top of the discharge baffle 29 is in contact with the bottom of the concentration heating cylinder 3. The support guide hole 30 can support the discharge baffle 29, so that the discharge baffle 29 is more stable when it blocks and seals the concentration heating cylinder 3.

[0022] In this embodiment, the zinc sulfate heptahydrate solution concentration pretreatment component 2 includes a drain pipe 31, a tail gas discharge pipe 32, a solenoid valve 33, a detachable filter plate 34, and fixing bolts 35. The drain pipe 31 is fixedly installed inside the preheating cylinder 8, the tail gas discharge pipe 32 is fixedly installed on the top of the preheating cylinder 8, and the solenoid valve 33 is fixedly installed on the outside of the drain pipe 31 and the tail gas discharge pipe 32, respectively. The detachable filter plate 34 is installed on the liquid inlet filter frame 10 by fixing bolts 35. The detachable filter plate 34 can be quickly disassembled and assembled by fixing bolts 35, which is convenient for staff to replace the detachable filter plate 34 later.

[0023] In this embodiment, the zinc sulfate heptahydrate solution concentration pretreatment component 2 further includes a solution pH detection probe 36, a water pump 37, and a delivery pipeline 38. The solution pH detection probe 36 is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjustment cylinder 9, and the water pump 37 is fixedly installed on the bottom of the zinc sulfate heptahydrate solution pH adjustment cylinder 9. The suction end of the water pump 37 is connected to the zinc sulfate heptahydrate solution pH adjustment cylinder 9. One end of the delivery pipeline 38 is fixedly installed on the output end of the water pump 37, and the other end of the delivery pipeline 38 is fixedly installed on the inner side of the concentration heating cylinder 3. The water pump 37 can transfer the solution after pH adjustment to the concentration heating cylinder 3 for concentration processing.

[0024] In this embodiment, the preheating cylinder 8 is covered with heat insulation cotton, and the acid-base adjustment cylinder 9 of zinc sulfate heptahydrate is made of thermally conductive copper. The heat insulation cotton can keep the preheating cylinder 8 warm and prevent personnel from being scalded when adding the solution. The thermally conductive copper material can allow the solution in the acid-base adjustment cylinder 9 of zinc sulfate heptahydrate to be preheated by water vapor.

[0025] The first motor 12, the second motor 16, the electric telescopic rod 28, the solenoid valve 33, the solution pH detection probe 36, and the water pump 37 are all mature and standardized existing technology components in the field of industrial equipment. Their internal structure, working principle, and basic functions have been widely disclosed in the industry and have formed general technical specifications, so there is no need to repeat them in this utility model patent document.

[0026] The specific operation involves filtering the zinc sulfate heptahydrate solution through a detachable filter plate 34. The filtered solution then enters the pH adjustment cylinder 9. A pH detection probe 36 detects the pH of the solution to prevent hydrolysis during concentration, which would generate zinc hydroxide precipitate and affect concentration efficiency and crystal purity. Therefore, dilute sulfuric acid or zinc oxide is added to adjust the pH to 3-5. A water pump 37 is activated to extract the solution and transfer it through a delivery pipe 38 to the concentration heating cylinder 3. A heating electrode 4 is activated to heat the solution in the concentration heating cylinder 3. During heating, water vapor is generated. This vapor is transferred to a preheating cylinder 8 via a vacuum pump 5 and a steam delivery pipe 6. The vapor preheats the solution in the pH adjustment cylinder 9, and condenses into water upon cooling. The water is collected and discharged through a drain pipe 31, while excess exhaust gas is discharged through an exhaust gas discharge pipe 32. During the concentration process, a second motor can be controlled. 16 drives the turntable 17 and stirring rod 18 to rotate. The stirring rod 18 can stir the solution to prevent zinc sulfate from adhering to the tank wall and forming hard lumps. After concentration, the solution can be kept warm to form crystals. After crystallization, the electric telescopic rod 28 is controlled to drive the discharge baffle 29 to slide, so that the discharge baffle 29 can remove the obstruction of the concentration heating cylinder 3. The first motor 12 can be controlled to start and drive the first lead screw 13 to rotate. After the first lead screw 13 rotates, it can drive the lifting plate 15 to rise through the thread engagement. The lifting plate 15 can drive the stirring rod 18 to rise. Multiple cleaning scraping holes 20 on the movable plate 19 can scrape off the crystals on the stirring rod 18. After the first lead screw 13 rotates, it can drive the second lead screw 21 to rotate in the opposite direction through the transmission gear 22. After the second lead screw 21 rotates, it can drive the sliding plate 24, sliding rod 25 and cleaning scraper 26 to descend through the thread engagement. The cleaning scraper 26 can scrape off the inner wall of the concentration heating cylinder 3, allowing the crystals to fall from the bottom of the concentration heating cylinder 3, which is convenient for the staff to collect later.

[0027] It should be noted that although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for concentrating zinc sulfate heptahydrate solution, characterized in that, include: A concentration heating cylinder (3) is provided. A heating electrode (4) is fixedly installed on the right side of the concentration heating cylinder (3). A vacuum pump (5) is fixedly installed on the top of the concentration heating cylinder (3). The suction end of the vacuum pump (5) is connected to the concentration heating cylinder (3). One end of a steam conveying pipe (6) is fixedly installed on the output end of the vacuum pump (5). A zinc sulfate heptahydrate solution concentration discharge assembly (1) is provided on the concentration heating cylinder (3). The zinc sulfate heptahydrate solution concentration and discharge assembly (1) includes a fixed frame (11), a first motor (12), a first lead screw (13), a one-way rod (14), a lifting plate (15), a second motor (16), a turntable (17), and a stirring rod (18). The fixed frame (11) is fixedly installed on the left side of the concentration heating cylinder (3). The first motor (12) is fixedly installed on the top of the fixed frame (11). The first lead screw (13) is fixedly installed on the output end of the first motor (12). The one-way rod (14) is fixedly installed on the inner side of the fixed frame (11). The lifting plate (15) is threaded on the outer side of the first lead screw (13) and slidably installed on the outer side of the one-way rod (14). The second motor (16) is fixedly installed on the top of the lifting plate (15). The turntable (17) is fixedly installed on the output end of the second motor (16). The stirring rod (18) is fixedly installed on the bottom of the turntable (17).

2. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 1, characterized in that, A support plate (7) is fixedly installed on the right side of the concentration heating cylinder (3), and a preheating cylinder (8) is fixedly installed on the top of the support plate (7). The other end of the steam conveying pipe (6) is fixedly installed on the inner side of the preheating cylinder (8). A zinc sulfate heptahydrate solution pH adjustment cylinder (9) is fixedly installed on the inner side of the preheating cylinder (8). An inlet filter frame (10) is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjustment cylinder (9). A zinc sulfate heptahydrate solution concentration pretreatment component (2) is provided on the preheating cylinder (8), the zinc sulfate heptahydrate solution pH adjustment cylinder (9), and the inlet filter frame (10).

3. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 1, characterized in that, The top of the concentration heating cylinder (3) is rotatably mounted with a movable disc (19), and the top of the movable disc (19) is provided with multiple cleaning scraping holes (20). The stirring rod (18) is slidably mounted on the inside of the cleaning scraping holes (20).

4. The zinc sulfate heptahydrate solution concentration apparatus according to claim 3, characterized in that, The zinc sulfate heptahydrate solution concentration and discharge assembly (1) further includes a second lead screw (21), a transmission gear (22), a limiting rod (23), a sliding plate (24), a sliding rod (25), and a cleaning scraper (26). The second lead screw (21) is rotatably installed on the inner side of the fixed frame (11). The transmission gear (22) is fixedly installed on the outer side of the second lead screw (21) and the first lead screw (13), respectively. Two adjacent transmission gears (22) mesh with each other. The limiting rod (23) is fixedly installed on the inner side of the liquid inlet filter frame (10). The sliding plate (24) is threaded on the outer side of the second lead screw (21) and slidably installed on the outer side of the limiting rod (23). The sliding rod (25) is fixedly installed on the bottom of the sliding plate (24). The cleaning scraper (26) is fixedly installed on the bottom of the sliding rod (25). The cleaning scraper (26) is in contact with the inner wall of the concentration heating cylinder (3).

5. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 1, characterized in that, Two support frames (27) are fixedly installed at the bottom of the concentration heating cylinder (3). An electric telescopic rod (28) is fixedly installed on the right side of the concentration heating cylinder (3). A discharge baffle (29) is fixedly installed at the output end of the electric telescopic rod (28). A support guide hole (30) is opened on one side of the support frame (27). The discharge baffle (29) is slidably installed inside the support guide hole (30). The top of the discharge baffle (29) is in contact with the bottom of the concentration heating cylinder (3).

6. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 2, characterized in that, The zinc sulfate heptahydrate solution concentration pretreatment component (2) includes a drain pipe (31), a tail gas discharge pipe (32), a solenoid valve (33), a detachable filter plate (34), and fixing bolts (35). The drain pipe (31) is fixedly installed on the inside of the preheating cylinder (8), the tail gas discharge pipe (32) is fixedly installed on the top of the preheating cylinder (8), the solenoid valve (33) is fixedly installed on the outside of the drain pipe (31) and the tail gas discharge pipe (32), and the detachable filter plate (34) is installed on the liquid inlet filter frame (10) by fixing bolts (35).

7. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 6, characterized in that, The zinc sulfate heptahydrate solution concentration pretreatment component (2) also includes a solution pH detection probe (36), a water pump (37), and a delivery pipeline (38). The solution pH detection probe (36) is fixedly installed on the top of the zinc sulfate heptahydrate solution pH adjustment cylinder (9). The water pump (37) is fixedly installed on the bottom of the zinc sulfate heptahydrate solution pH adjustment cylinder (9). The suction end of the water pump (37) is connected to the zinc sulfate heptahydrate solution pH adjustment cylinder (9). One end of the delivery pipeline (38) is fixedly installed on the output end of the water pump (37), and the other end of the delivery pipeline (38) is fixedly installed on the inside of the concentration heating cylinder (3).

8. The apparatus for concentrating zinc sulfate heptahydrate solution according to claim 2, characterized in that, The preheating cylinder (8) is covered with heat-insulating cotton on the outside, and the acid-base adjustment cylinder (9) of the zinc sulfate heptahydrate solution is made of thermally conductive copper.

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