A zinc sulfate leaching device and leaching method

Abstract

The application belongs to the technical field of zinc sulfate leaching, in particular to a zinc sulfate leaching device and a leaching method, which comprise a plurality of uniformly arranged leaching assemblies; the leaching assembly comprises an inner tank; a pair of partition plates are fixedly connected to the outer wall of the inner tank, and the partition plates are arranged in a ring shape; an outer tank is fixedly connected to the partition plates away from the inner tank; a pair of symmetrically arranged steam pipes are fixedly connected to the surface of the outer tank between the two partition plates, and the two steam pipes are connected with an external steam generator; the overflow pipe and the connecting assembly are connected in series, so that the slurry can continuously pass through a plurality of inner tanks for reaction, thereby enabling the slurry to fully react, and at the same time, ore pulp is continuously injected into the entire series of leaching assemblies, zinc sulfate is continuously produced, thereby realizing continuous leaching operation of zinc sulfate, avoiding the need for cleaning of the container after each leaching operation in the traditional leaching operation, and thereby improving the preparation efficiency of zinc sulfate.

Description

Technical Field

[0001] This invention belongs to the field of zinc sulfate leaching technology, specifically a zinc sulfate leaching apparatus and leaching method. Background Technology

[0002] Zinc sulfate is one of the most important zinc salts. It is a colorless orthorhombic crystal or a white powder. Its heptahydrate is commonly known as zinc sulfate. It is widely used in many fields such as industry, agriculture, and medicine. Due to its wide application, zinc sulfate is usually produced industrially by leaching with dilute sulfuric acid.

[0003] In existing technologies, zinc sulfate is usually produced by passing a slurry containing zinc oxide and zinc sulfide into a reaction vessel, adding an appropriate amount of dilute sulfuric acid, stirring, and introducing oxygen during the stirring process. This allows the zinc oxide and zinc sulfate to react with the dilute sulfuric acid and oxygen to obtain a zinc sulfate solution. The remaining slurry is then separated to obtain a pure zinc sulfate solution.

[0004] In the above-mentioned technology, zinc sulfate leaching is carried out in a single reaction vessel to prepare zinc sulfate solution. However, the reaction time of zinc oxide and zinc sulfate with dilute sulfuric acid and oxygen is relatively long, and the reaction vessel needs to be cleaned and maintained after each slurry is taken out before the next leaching operation can be carried out, which affects the preparation efficiency of zinc sulfate.

[0005] Therefore, the present invention provides a zinc sulfate leaching apparatus and leaching method. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A zinc sulfate leaching device according to this invention includes multiple uniformly arranged leaching components; each leaching component includes an inner tank; a pair of partitions are fixedly connected to the outer wall of the inner tank, and the partitions are arranged in a ring; an outer tank is fixedly connected to the two partitions away from the inner tank; a pair of symmetrically arranged steam pipes are fixedly connected to the surface of the outer tank between the two partitions, and the two steam pipes are connected to an external steam generator; a sealing cover is fixedly connected to the top of the outer tank; a pump pipe is fixedly connected to the top surface of the sealing cover, and the pump pipe extends into the inner tank; an overflow pipe is fixedly connected to the side of the sealing cover away from the pump pipe; a stirrer is rotatably connected to the bottom surface inside the inner tank, and the stirrer is connected to an external servo motor via a magnetic coupling; a pair of conveying pipes are fixedly connected to the bottom surface of the outer tank; the two conveying pipes respectively convey oxygen and sulfuric acid; a connecting component is fixedly connected between the pump pipes and pressurizing pipes of adjacent leaching components; the connecting component is used to initially separate the slurry in the overflow pipe and pump it into the pump pipe of the next leaching component. A solenoid valve is installed at one end of the overflow pipe near the sealing cover; a pressure pipe is fixedly connected to the other end of the overflow pipe away from the sealing cover, and the pressure pipe is vertically arranged; a discharge pipe is fixedly connected to the side surface of the pressure pipe near the bottom, and the discharge pipe communicates with the inside of the pressure pipe. The connecting assembly includes a settling tank; the discharge pipe is L-shaped, and the end of the discharge pipe away from the pressurization pipe is fixed to the top surface of the settling tank; a flow guide cover is fixed inside the settling tank near the top, and the flow guide cover is funnel-shaped; a conduit is fixed inside the settling tank to the bottom of the flow guide cover; a slurry discharge pipe is fixed to the bottom of the settling tank, and the slurry discharge pipe is connected to the pumping pipe of the next leaching assembly through a pumping device.

[0008] Preferably, a pressure column is slidably connected to the vertical part of the pressure tube; a flow guide groove is provided inside the pressure column; the flow guide groove is L-shaped, and the two openings of the flow guide groove are located on the bottom surface and the side surface of the pressure column, respectively; a diaphragm is fixedly connected to the bottom surface of the pressure column.

[0009] Preferably, the top surface of the pressure column is provided with a base plate, the base plate is slidably connected to the pressure pipe, and the lowest position of the base plate is located at the lower edge of the discharge pipe; the top surface of the base plate is rotatably connected to a stop rod; the top of the stop rod is slidably connected to a sleeve; a top plate is slidably connected to the sleeve near the bottom position, and the top plate is slidably connected to the pressure pipe; a spring is fixedly connected between the base plate and the top plate; a nut is threadedly connected to the top surface of the top plate on the surface of the sleeve, and the nut is fixedly connected to the top surface of the top plate; a cover plate is fixedly connected to the top surface of the pressure pipe, and the sleeve is rotatably connected to the cover plate.

[0010] Preferably, a rotating rod is rotatably connected to the axis of the guide cover; a scraper is fixedly connected to the top of the rotating rod, and the scraper is adapted to the top surface of the guide cover; a collecting tank is fixedly connected to the bottom surface of the rotating rod, and the diameter of the top of the collecting tank is larger than the diameter of its bottom; the collecting tank is located inside the conduit; a liquid outlet pipe is fixedly connected to the side surface of the bottom of the collecting tank, and the liquid outlet pipe is L-shaped.

[0011] Preferably, one end of the conduit inside the settling tank is fixedly connected to a cover; the surface of the cover has a plurality of evenly spaced notches; a liquid guide plate is fixedly connected to the bottom of the notches on the inner wall of the cover, and the end of the liquid guide plate away from the inner wall of the cover is located at the top of the collecting tank; a gap is left between the top of the collecting tank and the conduit.

[0012] Preferably, the bottom of the settling tank is funnel-shaped; the conduit is L-shaped; and a pair of symmetrically arranged guide plates are fixed to the top surface of the horizontally arranged end of the conduit, and the two guide plates are arranged in an inverted V shape.

[0013] A zinc sulfate leaching method, which uses the aforementioned zinc sulfate leaching apparatus, comprises the following steps: S1: First, crush the zinc-containing ore, and then mix the ore powder with water at a mass ratio of 1:3 to make a slurry; S2: Then the slurry is pumped into the inner tank, and dilute sulfuric acid and oxygen with a concentration of 120-150 g / L are pumped into the inner tank through the delivery pipe. The temperature inside the inner tank is maintained at 95-100℃. Then the inner tank is stirred by the agitator to ensure that the slurry is fully mixed with the dilute sulfuric acid and oxygen. S3: After the slurry is fully mixed and reacted, the slurry inside the inner tank is separated to remove impurities and obtain zinc sulfate solution from the slurry supernatant. Then, the zinc sulfate solution is crystallized by an evaporator.

[0014] Preferably, in step S2, the slurry that has reacted in the inner tank for a period of time is filtered and then passed into another inner tank, where dilute sulfuric acid and oxygen are added to continue the reaction. After filtration, the process of passing the slurry into another inner tank and adding dilute sulfuric acid and oxygen is repeated. This allows the leaching components to be connected in series, thereby achieving continuous leaching of zinc sulfate.

[0015] The beneficial effects of this invention are as follows: 1. The zinc sulfate leaching device and leaching method of the present invention, by connecting overflow pipes and connecting components in series, allows the slurry to continuously pass through multiple inner tanks for reaction, thereby ensuring that the slurry reacts fully. At the same time, the slurry can be continuously injected into the entire series-connected leaching assembly, and zinc sulfate can be continuously produced. This achieves continuous leaching operation of zinc sulfate, thereby avoiding the need to clean the container after each leaching operation in traditional leaching operations, and thus improving the preparation efficiency of zinc sulfate.

[0016] 2. The zinc sulfate leaching device and leaching method of the present invention introduces slurry into a pressure pipe, thereby forming a pressure column inside the pressure pipe, which achieves the effect of pressurizing the inside of the inner tank. That is, only when the pressure inside the inner tank forces the slurry in the pressure column to the position of the discharge pipe can the slurry be discharged from the discharge pipe and enter the next leaching component through the connecting component. This increases the pressure inside the inner tank, thereby increasing the reaction rate of zinc oxide and zinc sulfide with dilute sulfuric acid. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the structure of the outer tank in this invention; Figure 3 This is a cross-sectional view of the outer tank in this invention; Figure 4 This is a cross-sectional view of the pressurization pipe in this invention; Figure 5 This is a cross-sectional view of the pressure column in this invention; Figure 6 This is a schematic diagram of the sleeve structure in this invention; Figure 7 This is a cross-sectional view of the settling tank in this invention; Figure 8 This is a cross-sectional view of the catheter in this invention; Figure 9 This is a cross-sectional view of the flow guide cover in this invention; Figure 10 This is a flowchart of the present invention; In the diagram: 1. Inner tank; 2. Baffle plate; 3. Outer tank; 4. Steam pipe; 5. Sealing cover; 6. Pump feed pipe; 7. Overflow pipe; 8. Agitator; 9. Conveying pipe; 10. Pressurizing pipe; 11. Discharge pipe; 12. Pressurizing column; 13. Guide channel; 14. Diaphragm; 15. Bottom plate; 16. Push rod; 17. Sleeve; 18. Top plate; 19. Spring; 20. Nut; 21. Cover plate; 22. Settling tank; 23. Guide cover; 24. Guide tube; 25. Rotating rod; 26. Scraper; 27. Collecting tank; 28. Liquid outlet pipe; 29. ​​Cover; 30. Notch; 31. Liquid guide plate; 33. Guide plate; 34. Slurry discharge pipe. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] like Figures 1 to 3As shown in the embodiment of the present invention, a zinc sulfate leaching device includes a plurality of uniformly arranged leaching components; each leaching component includes an inner tank 1; a pair of partitions 2 are fixedly connected to the outer wall of the inner tank 1, and the partitions 2 are arranged in a ring; an outer tank 3 is fixedly connected to the two partitions 2 away from the inner tank 1; a pair of symmetrically arranged steam pipes 4 are fixedly connected to the surface of the outer tank 3 between the two partitions 2, and the two steam pipes 4 are connected to an external steam generator; a sealing cover 5 is fixedly connected to the top of the outer tank 3; a pump pipe 6 is fixedly connected to the top surface of the sealing cover 5, and the pump pipe 6 extends into the interior of the inner tank 1; an overflow pipe 7 is fixedly connected to the side of the sealing cover 5 away from the pump pipe 6; the inner tank 1 An agitator 8 is rotatably connected to the bottom surface of the inner tank, and the agitator 8 is connected to an external servo motor via a magnetic coupling. A pair of conveying pipes 9 are fixedly connected to the bottom surface of the outer tank 3. The two conveying pipes 9 respectively convey oxygen and sulfuric acid. A connecting assembly is fixedly connected between the pumping pipe 6 and the pressurizing pipe 10 of adjacent leaching components. The connecting assembly is used to initially separate the slurry in the overflow pipe 7 and then pump it into the pumping pipe 6 of the next leaching component. During operation, in order to improve the preparation efficiency of zinc sulfate, the embodiment of the present invention can be used. First, the slurry containing zinc oxide and zinc sulfide is pumped into the inner tank 1 through the pumping pipe 6, and then dilute sulfuric acid and sulfuric acid are pumped into the inner tank 1 through the two conveying pipes 9. Oxygen is introduced, and then the agitator 8 rotates to mix the slurry, dilute sulfuric acid, and oxygen inside the inner tank 1. During this period, the external steam generator introduces high-temperature steam through the steam pipe 4 into the space formed by the inner tank 1, the outer tank 3, and the two partitions 2, thereby heating the inner tank 1 and maintaining its temperature at 95-100°C. Subsequently, as the pump assembly and conveying pipe 9 continuously introduce slurry and dilute sulfuric acid into the inner tank 1, the liquid level inside the inner tank 1 rises continuously until it reaches the overflow pipe 7. The overflowing slurry is then guided into the connecting assembly by the overflow pipe 7. After initial separation by the connecting assembly, the unreacted slurry is sent to the next inner tank 1. The unreacted slurry is fed into the inner tank 1 through the pump pipe 6, and dilute sulfuric acid and oxygen are introduced to carry out the same reaction process as before. Multiple leaching components are connected in series through the overflow pipe 7 and connecting components, so that the slurry can continuously pass through multiple inner tanks 1 to react, thus ensuring that the slurry reacts fully. At the same time, the slurry can be continuously injected into the entire series-connected leaching components, and zinc sulfate can be continuously produced. This realizes the continuous leaching operation of zinc sulfate, thereby avoiding the need for cleaning and maintenance of the container after each leaching operation in the traditional leaching operation, and thus improving the preparation efficiency of zinc sulfate.

[0021] like Figures 2 to 4As shown, a solenoid valve is installed at the end of the overflow pipe 7 near the sealing cover 5; a pressure pipe 10 is fixedly connected to the end of the overflow pipe 7 away from the sealing cover 5, and the pressure pipe 10 is vertically arranged; a discharge pipe 11 is fixedly connected to the side surface of the pressure pipe 10 near the bottom, and the discharge pipe 11 communicates with the inside of the pressure pipe 10; during operation, when the slurry inside the inner tank 1 overflows into the overflow pipe 7, the overflow pipe 7 will guide the slurry into the pressure pipe 10. Since the pressure pipe 10 is vertically arranged, the slurry entering the pressure pipe 10 will be pressurized by the pressure inside the inner tank 1. Under the influence of the pressure, the slurry rises continuously and eventually enters the discharge pipe 11. From the discharge pipe 11, it is introduced into the connecting assembly. By introducing the slurry into the pressurizing pipe 10, a pressure column is formed inside the pressurizing pipe 10, thereby pressurizing the inside of the inner tank 1. Only when the pressure inside the inner tank 1 forces the slurry in the pressurizing column 12 to the position of the discharge pipe 11 can the slurry be discharged from the discharge pipe 11 and enter the next leaching assembly through the connecting assembly. This increases the pressure inside the inner tank 1, thereby increasing the reaction rate of zinc oxide and zinc sulfide with dilute sulfuric acid.

[0022] like Figure 2 , Figure 7 and Figure 8 As shown, the connecting assembly includes a settling tank 22; the discharge pipe 11 is L-shaped, and the end of the discharge pipe 11 away from the pressurization pipe 10 is fixed to the top surface of the settling tank 22; a guide cover 23 is fixedly connected to the inside of the settling tank 22 near the top, and the guide cover 23 is funnel-shaped; a conduit 24 is fixedly connected to the bottom of the guide cover 23 inside the settling tank 22; a slurry discharge pipe 34 is fixedly connected to the bottom of the settling tank 22, and the slurry discharge pipe 34 is connected to the pump pipe 6 of the next leaching assembly through a pump feeder; during operation, when the slurry in the discharge pipe 11 enters the settling tank 22, it first contacts the guide cover 23 and is guided on the surface of the guide cover 23. The slurry slides down to the bottom of the settling tank 22, and during the settling process, most of the solids in the slurry settle to the bottom, while the required zinc sulfate solution is located in the upper clear liquid at the top, and eventually overflows into the conduit 24 and is discharged to the outside for collection. The slurry that has not been fully reacted at the bottom is directly pumped into the pump pipe 6 of the next leaching component by the pump feeder for further reaction. When the settling tank 22 completes the initial separation of the reacted slurry, the guide cover 23 not only slows down the speed at which the slurry enters the settling tank 22, but also blocks the top of the conduit 24, so that the slurry does not directly fall into the conduit 24, thus preventing poor separation effect.

[0023] like Figures 4 to 5As shown, a pressure column 12 is slidably connected to the vertical part of the pressure pipe 10; a guide groove 13 is provided inside the pressure column 12; the guide groove 13 is L-shaped, and the two openings of the guide groove 13 are located on the bottom surface and side surface of the pressure column 12, respectively; a diaphragm 14 is fixedly connected to the bottom surface of the pressure column 12; during operation, when the slurry in the inner tank 1 enters the pressure pipe 10 through the overflow pipe 7, it will push the pressure column 12 up until it reaches the guide groove on the side surface of the pressure column 12. The 13 slot is connected to the discharge pipe 11, and its diaphragm 14 can seal the gap between the pressure column 12 and the pressure pipe 10. At this time, the slurry can only enter the guide groove 13 inside the pressure column 12 and finally be discharged into the discharge pipe 11. Thus, the gravity of the pressure column 12 provides resistance to the rise of the slurry, so that the pressure environment inside the inner tank 1 can be maintained without setting the pressure column 12 too high, thereby reducing the height of the pressure pipe 10 and making it convenient for users to carry out maintenance.

[0024] like Figures 4 to 6 As shown, a base plate 15 is provided on the top surface of the pressure column 12. The base plate 15 is slidably connected to the pressure pipe 10, and the lowest position of the base plate 15 is located at the lower edge of the discharge pipe 11. A stop rod 16 is rotatably connected to the top surface of the base plate 15. A sleeve 17 is slidably connected to the top of the stop rod 16. A top plate 18 is slidably connected to the sleeve 17 near the bottom, and the top plate 18 is slidably connected to the pressure pipe 10. A spring 19 is fixedly connected between the base plate 15 and the top plate 18. A nut 20 is threadedly connected to the surface of the sleeve 17 and the top surface of the top plate 18, and the nut 20 is fixedly connected to the top surface of the top plate 18. A cover plate 21 is fixedly connected to the top surface of the pressure pipe 10, and the sleeve 17 and the cover plate 21 are connected to each other. Rotary connection; During operation, when the user needs to adjust the pressure inside the inner tank 1, the user needs to screw on the sleeve 17, so that the nut 20 can drive the top plate 18 to descend along the sleeve 17, thereby shortening the distance between the top plate 18 and the bottom plate 15, thereby increasing the initial elastic force of the spring 19. At this time, after the slurry lifts the pressure column 12, the slurry not only has to overcome the weight of the pressure column 12, but also will be squeezed by the pressure column 12 against the bottom plate 15 during the rising process, which will further compress the spring 19. Therefore, it also needs to overcome the elastic force of the spring 19. The elastic force of the spring 19 can be adjusted by screwing on the sleeve 17, so the user can more conveniently adjust the pressure inside the inner tank 1.

[0025] like Figures 7 to 9As shown, a rotating rod 25 is rotatably connected to the axis of the guide cover 23; a scraper 26 is fixedly connected to the top of the rotating rod 25, and the scraper 26 is adapted to the top surface of the guide cover 23; a collecting tank 27 is fixedly connected to the bottom surface of the rotating rod 25, and the diameter of the top of the collecting tank 27 is larger than the diameter of its bottom; the collecting tank 27 is located inside the conduit 24; a liquid outlet pipe 28 is fixedly connected to the side surface of the bottom of the collecting tank 27, and the liquid outlet pipe 28 is L-shaped; during operation, when stationary... After the upper layer of clear liquid in tank 22 overflows into the conduit 24, the clear liquid will flow into the collecting tank 27. Then, due to gravity, the clear liquid in the collecting tank 27 will spray out from the liquid outlet pipe 28 at the bottom of the collecting tank 27 and a backflow phenomenon will occur, which will drive the collecting tank 27 to rotate. The collecting tank 27 will then drive the rotating rod 25 to rotate. Finally, the rotating rod 25 will drive the scraper 26 to rotate, thereby achieving a scraping effect on the top of the guide cover 23 and preventing some slurry from sticking to the top surface of the guide cover 23.

[0026] like Figures 7 to 9 As shown, one end of the conduit 24 located inside the settling tank 22 is fixedly connected to a cover 29; the surface of the cover 29 has a plurality of evenly arranged notches 30; a liquid guide plate 31 is fixedly connected to the bottom of the notch 30 on the inner wall of the cover 29, and the end of the liquid guide plate 31 away from the inner wall of the cover 29 is located at the top of the collecting tank 27; a gap is left between the top of the collecting tank 27 and the conduit 24; during operation, when the clear liquid continuously accumulates in the inner end of the settling tank 22 and rises to the notch 30 on the surface of the cover 29, the clear liquid will flow into the interior of the cover 29 from the notch 30, and under the action of the liquid guide plate 31, it will flow into the collecting tank 27, thereby ensuring that as much clear liquid as possible can enter the collecting tank 27, so as to ensure that the collecting tank 27 can rotate normally afterwards. When too much clear liquid enters the cover 29 and the liquid outlet pipe 28 cannot collect the clear liquid in the collecting tank 27 in time, the clear liquid can also flow out from the gap between the collecting tank 27 and the conduit 24, thus not affecting the discharge efficiency of the conduit 24.

[0027] like Figures 7 to 9 As shown, the bottom of the settling tank 22 is funnel-shaped; the conduit 24 is L-shaped; a pair of symmetrically arranged guide plates 33 are fixed to the top surface of the horizontal end of the conduit 24, and the two guide plates 33 are inverted V-shaped. During operation, when the slurry enters the settling tank 22 for sedimentation, some of the sediment will fall to the horizontal part of the conduit 24. At this time, the two inverted V-shaped guide plates 33 can guide the sediment and prevent it from accumulating in the horizontal part of the conduit 24. The funnel-shaped bottom of the settling tank 22 can also better collect the sediment for the next leaching operation.

[0028] like Figure 10 As shown, a zinc sulfate leaching method is described above, using a zinc sulfate leaching apparatus. The steps of this method are as follows: S1: First, crush the zinc-containing ore, and then mix the ore powder with water at a mass ratio of 1:3 to make a slurry; S2: Then the slurry is pumped into the inner tank 1, and dilute sulfuric acid and oxygen with a concentration of 120-150g / L are pumped into the inner tank 1 through the delivery pipe 9. The temperature inside the inner tank 1 is maintained at 95-100℃. Then the inner tank 1 is stirred by the agitator 8 so that the slurry is fully mixed with the dilute sulfuric acid and oxygen. S3: After the slurry is fully mixed and reacted, the slurry inside the inner tank 1 is separated to remove impurities from the slurry and obtain zinc sulfate solution from the slurry supernatant. Then, the zinc sulfate solution is crystallized by an evaporator.

[0029] like Figure 10 As shown, the slurry that has reacted in inner tank 1 for a period of time in S2 is filtered and then passed into another inner tank 1. Dilute sulfuric acid and oxygen are added to continue the reaction. After filtration, the process is repeated again, passing the slurry into another inner tank and adding dilute sulfuric acid and oxygen. This series connection of the leaching components enables continuous leaching of zinc sulfate. During operation, the slurry continuously passes through each inner tank 1 for reaction. While ensuring sufficient reaction of the slurry, continuous input and output of raw materials and products are achieved. This avoids the cleaning work required after each leaching operation in traditional leaching operations, thereby improving production efficiency.

[0030] In order to improve the preparation efficiency of zinc sulfate during operation, the present invention embodiment can be used. First, a slurry containing zinc oxide and zinc sulfide is pumped into the inner tank 1 through the pump pipe 6. Then, dilute sulfuric acid and oxygen are pumped into the inner tank 1 through two conveying pipes 9. Afterward, the stirrer 8 rotates to mix the slurry, dilute sulfuric acid and oxygen in the inner tank 1. During this period, the external steam generator will pass high-temperature steam into the space formed by the inner tank 1, the outer tank 3 and the two partitions 2 through the steam pipe 4, thereby heating the inner tank 1 and maintaining the temperature of the inner tank 1 at 95-100°C. Subsequently, as the pump assembly and conveying pipes 9 continue to introduce slurry and dilute sulfuric acid into the inner tank 1, the liquid level inside the inner tank 1 will rise continuously until the liquid level reaches the overflow pipe 7, and the overflow pipe 7 will overflow the liquid. The slurry is introduced into the connecting assembly. After initial separation by the connecting assembly, the incompletely reacted slurry is sent to the pump pipe 6 at the next inner tank 1. The pump pipe 6 then sends the unreacted slurry into the inner tank 1, where dilute sulfuric acid and oxygen are introduced to carry out the same reaction process as before. In this way, multiple leaching units are connected in series through the overflow pipe 7 and the connecting assembly, allowing the slurry to continuously pass through multiple inner tanks 1 for reaction. This ensures that the slurry reacts fully, while the slurry is continuously injected into the entire series of leaching units, and zinc sulfate is continuously produced. This achieves continuous leaching of zinc sulfate, thus avoiding the need to clean the container after each leaching operation, which is required in traditional leaching operations, thereby improving the production efficiency of zinc sulfate.

[0031] When the slurry inside the inner tank 1 overflows into the overflow pipe 7, the overflow pipe 7 will guide the slurry into the pressurizing pipe 10. Since the pressurizing pipe 10 is vertically set, the slurry entering the pressurizing pipe 10 will continuously rise under the pressure inside the inner tank 1 and eventually enter the discharge pipe 11. Then, it will be guided into the connecting assembly from the discharge pipe 11. By guiding the slurry into the pressurizing pipe 10, a pressure column is formed inside the pressurizing pipe 10, thereby achieving the effect of pressurizing the inside of the inner tank 1. That is, only when the pressure inside the inner tank 1 forces the slurry in the pressurizing column 12 to the position of the discharge pipe 11 can the slurry be discharged from the discharge pipe 11 and enter the next leaching assembly through the connecting assembly. This increases the pressure inside the inner tank 1, thereby increasing the reaction rate of zinc oxide and zinc sulfide with dilute sulfuric acid.

[0032] When the slurry in the inner tank 1 enters the pressure pipe 10 through the overflow pipe 7, it will push the pressure column 12 up until the opening of the guide groove 13 on the side surface of the pressure column 12 is aligned with the discharge pipe 11. The spacer 14 can seal the gap between the pressure column 12 and the pressure pipe 10. At this time, the slurry can only enter the guide groove 13 inside the pressure column 12 and finally be discharged into the discharge pipe 11. Thus, the gravity of the pressure column 12 provides resistance to the rise of the slurry, so that the pressure environment inside the inner tank 1 can be maintained without setting the pressure column 12 too high, thereby reducing the height of the pressure pipe 10 and making it convenient for users to perform maintenance.

[0033] When the user needs to adjust the pressure inside the inner tank 1, the user needs to screw on the sleeve 17 so that the nut 20 can drive the top plate 18 to descend along the sleeve 17, thereby shortening the distance between the top plate 18 and the bottom plate 15, thus increasing the initial elastic force of the spring 19. At this time, after the slurry lifts the pressure column 12, the slurry not only has to overcome the weight of the pressure column 12, but also has to overcome the elastic force of the spring 19 because the pressure column 12 will squeeze the bottom plate 15 during the rise. The elastic force of the spring 19 can be adjusted by screwing on the sleeve 17, so the user can adjust the pressure inside the inner tank 1 more conveniently.

[0034] When the slurry in the discharge pipe 11 enters the settling tank 22, it first contacts the guide cover 23 and slides down to the bottom of the settling tank 22 under the guidance of the guide cover 23. During the settling process, most of the solids in the slurry settle to the bottom, while the required zinc sulfate solution is located in the upper clear liquid at the top and eventually overflows into the conduit 24 and is discharged to the outside for collection. The slurry that has not been fully reacted at the bottom is directly pumped into the pump pipe 6 of the next leaching component by the pump feeder for further reaction. When the settling tank 22 completes the initial separation of the reacted slurry, the guide cover 23 not only slows down the speed at which the slurry enters the settling tank 22, but also shields the top of the conduit 24, preventing the slurry from directly hitting the conduit 24 and thus causing poor separation effect.

[0035] When the upper layer of clear liquid in the settling tank 22 overflows into the conduit 24, the clear liquid will flow into the collecting tank 27. Then, due to gravity, the clear liquid in the collecting tank 27 will spray out from the liquid outlet pipe 28 at the bottom of the collecting tank 27 and a backflow phenomenon will occur, which will drive the collecting tank 27 to rotate. The collecting tank 27 will then drive the rotating rod 25 to rotate, and finally the rotating rod 25 will drive the scraper 26 to rotate, thereby achieving a scraping effect on the top of the guide cover 23 and preventing some slurry from sticking to the top surface of the guide cover 23.

[0036] When the clear liquid accumulates continuously at the inner end of the settling tank 22 and rises to the notch 30 on the surface of the cover 29, the clear liquid will flow into the interior of the cover 29 through the notch 30 and flow into the collecting tank 27 under the action of the guide plate 31, thereby ensuring that as much clear liquid as possible can enter the collecting tank 27, so as to ensure that the collecting tank 27 can rotate normally afterwards. When too much clear liquid enters the cover 29 and the liquid outlet pipe 28 cannot collect the clear liquid in the collecting tank 27 in time, the clear liquid can also flow out from the gap between the collecting tank 27 and the guide pipe 24, thus not affecting the discharge efficiency of the guide pipe 24.

[0037] When the slurry enters the settling tank 22 for sedimentation, some of the sediment will fall to the horizontal part of the guide tube 24. At this time, the two inverted V-shaped guide plates 33 can guide the sediment and prevent it from accumulating in the horizontal part of the guide tube 24. The funnel-shaped bottom of the settling tank 22 can also better collect the sediment, so that the next leaching operation can be carried out.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zinc sulfate leaching apparatus, characterized in that: The system includes multiple uniformly arranged leaching components. Each leaching component includes an inner tank. A pair of baffles are fixedly connected to the outer wall of the inner tank, and the baffles are arranged in a ring. An outer tank is fixedly connected to the two baffles away from the inner tank. A pair of symmetrically arranged steam pipes are fixedly connected to the surface of the outer tank between the two baffles, and the two steam pipes are connected to an external steam generator. A sealing cover is fixedly connected to the top of the outer tank. A pump pipe is fixedly connected to the top surface of the sealing cover, and the pump pipe extends into the inner tank. An overflow pipe is fixedly connected to the side of the sealing cover away from the pump pipe. An agitator is rotatably connected to the bottom surface inside the inner tank, and the agitator is connected to an external servo motor via a magnetic coupling. A pair of conveying pipes are fixedly connected to the bottom surface of the outer tank. The two conveying pipes respectively convey oxygen and sulfuric acid. A connecting component is fixedly connected between the pump pipes and pressurizing pipes of adjacent leaching components. The connecting component is used to initially separate the slurry in the overflow pipe and pump it into the pump pipe of the next leaching component. A solenoid valve is installed at one end of the overflow pipe near the sealing cover; a pressure pipe is fixedly connected to the other end of the overflow pipe away from the sealing cover, and the pressure pipe is vertically arranged; a discharge pipe is fixedly connected to the side surface of the pressure pipe near the bottom, and the discharge pipe communicates with the inside of the pressure pipe. The connecting assembly includes a settling tank; the discharge pipe is L-shaped, and the end of the discharge pipe away from the pressurization pipe is fixed to the top surface of the settling tank; a flow guide cover is fixed inside the settling tank near the top, and the flow guide cover is funnel-shaped; a conduit is fixed inside the settling tank to the bottom of the flow guide cover; a slurry discharge pipe is fixed to the bottom of the settling tank, and the slurry discharge pipe is connected to the pumping pipe of the next leaching assembly through a pumping device.

2. The zinc sulfate leaching apparatus according to claim 1, characterized in that: A pressure column is slidably connected to the vertical part of the pressure tube; a flow guide groove is opened inside the pressure column; the flow guide groove is L-shaped, and the two openings of the flow guide groove are located on the bottom surface and the side surface of the pressure column, respectively; a diaphragm is fixedly connected to the bottom surface of the pressure column.

3. The zinc sulfate leaching apparatus according to claim 2, characterized in that: The top surface of the pressure column is provided with a base plate, which is slidably connected to the pressure pipe, and the lowest position of the base plate is located at the lower edge of the discharge pipe; the top surface of the base plate is rotatably connected to a stop rod; the top of the stop rod is slidably connected to a sleeve; a top plate is slidably connected to the sleeve near the bottom, and the top plate is slidably connected to the pressure pipe; a spring is fixedly connected between the base plate and the top plate; a nut is threadedly connected to the top surface of the top plate on the surface of the sleeve, and the nut is fixedly connected to the top surface of the top plate; a cover plate is fixedly connected to the top surface of the pressure pipe, and the sleeve is rotatably connected to the cover plate.

4. The zinc sulfate leaching apparatus according to claim 1, characterized in that: A rotating rod is rotatably connected to the axis of the flow guide cover; a scraper is fixedly connected to the top of the rotating rod, and the scraper is adapted to the top surface of the flow guide cover; a collecting tank is fixedly connected to the bottom surface of the rotating rod, and the diameter of the top of the collecting tank is larger than the diameter of its bottom; the collecting tank is located inside the conduit; a liquid outlet pipe is fixedly connected to the side surface of the bottom of the collecting tank, and the liquid outlet pipe is L-shaped.

5. A zinc sulfate leaching apparatus according to claim 4, characterized in that: The conduit is fixed to a cover at one end inside the settling tank; the surface of the cover has multiple evenly spaced notches; a liquid guide plate is fixed to the bottom of the notches on the inner wall of the cover, and the end of the liquid guide plate away from the inner wall of the cover is located at the top of the collecting tank; a gap is left between the top of the collecting tank and the conduit.

6. A zinc sulfate leaching apparatus according to claim 5, characterized in that: The bottom of the settling tank is funnel-shaped; the conduit is L-shaped; a pair of symmetrically arranged guide plates are fixed to the top surface of the horizontally arranged end of the conduit, and the two guide plates are arranged in an inverted V shape.

7. A zinc sulfate leaching method, wherein the method uses a zinc sulfate leaching apparatus according to any one of claims 1-6, characterized in that: The steps of this method are as follows: S1: First, crush the zinc-containing ore, and then mix the ore powder with water at a mass ratio of 1:3 to make a slurry; S2: Then the slurry is pumped into the inner tank, and dilute sulfuric acid and oxygen with a concentration of 120-150 g / L are pumped into the inner tank through the delivery pipe. The temperature inside the inner tank is maintained at 95-100℃. Then the inner tank is stirred by the agitator to ensure that the slurry is fully mixed with the dilute sulfuric acid and oxygen. S3: After the slurry is fully mixed and reacted, the slurry inside the inner tank is separated to remove impurities and obtain zinc sulfate solution from the slurry supernatant. Then, the zinc sulfate solution is crystallized by an evaporator.

8. The zinc sulfate leaching method according to claim 7, characterized in that: The slurry that has reacted in the inner tank of S2 for a period of time is filtered and then passed into another inner tank. Dilute sulfuric acid and oxygen are added to continue the reaction. After filtration, the process of passing the slurry into another inner tank and adding dilute sulfuric acid and oxygen is repeated. This allows the leaching components to be connected in series, thereby achieving continuous leaching of zinc sulfate.

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