Cadmium removal purification tank

Abstract

The utility model provides a cadmium removal purification tank which comprises a reaction tank, a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is arranged on the lower portion of the reaction tank, the liquid outlet pipe is arranged on the upper portion of the reaction tank, the reaction tank is of a hollow structure, a purification area communicated with the liquid inlet pipe and an overflow area communicated with the liquid outlet pipe are arranged in the reaction tank, and the passing area of the purification area is smaller than that of the overflow area. In the application, the passage area of the overflow area is larger than that of the purification area, so that the thrust of the solution on the metal cadmium removal material moving from the purification area to the overflow area is reduced, the flow velocity is reduced, and the metal cadmium removal material can fall back to the purification area under the action of self gravity. In this way, the utilization rate of the metal cadmium removal material can be increased, it is guaranteed that the content of the metal cadmium removal material in the solution in the purification area is in an excessive state compared with the theoretical dosage, and the stable cadmium removal effect of the purification area can be maintained; meanwhile, the content of the metal cadmium removal material in the solution in the overflow area can be reduced, and loss of the metal cadmium removal material is avoided.

Description

Technical Field

[0001] This application belongs to the technical field of reaction vessels, and particularly relates to a cadmium removal and purification tank. Background Art

[0002] Cadmium removal is carried out under certain temperature conditions. Utilizing the property that the standard electrode potential of zinc is more negative than that of cadmium, zinc powder is added to the solution to displace cadmium, and a flocculant is added to control a certain reaction rate, so as to displace and separate cadmium from the solution, thereby achieving the purpose of purifying the solution. However, when the traditional purification tank is used for cadmium removal from the solution, the consumption of zinc powder is large, the production cost is high, and the economic benefit is poor. In the cadmium removal stage, the consumption of zinc powder is at least twice the theoretical value. If the cadmium in the solution is to be completely displaced, the consumption of zinc powder is at least three times the theoretical value. Utility Model Content

[0003] Therefore, the technical problem to be solved by this application is to provide a cadmium removal and purification tank that can reduce the consumption of zinc powder and improve economic benefits.

[0004] To solve the above problems, this application provides a cadmium removal and purification tank, including a reaction tank, a liquid inlet pipe, and a liquid outlet pipe. The liquid inlet pipe is arranged at the lower part of the reaction tank, and the liquid outlet pipe is arranged at the upper part of the reaction tank. The reaction tank is of a hollow structure, and is internally provided with a purification area communicated with the liquid inlet pipe and an overflow area communicated with the liquid outlet pipe. The passage area of the purification area is smaller than that of the overflow area.

[0005] Optionally, the ratio of the inner diameter of the overflow area to the inner diameter of the purification area is 1.5 - 1.8.

[0006] Optionally, a first stirring mechanism is arranged in the purification area. The first stirring mechanism includes at least two first stirring paddles, and at least two of the first stirring paddles are arranged at equal intervals in the vertical direction, and the length of each first stirring paddle is greater than half of the inner diameter of the purification area.

[0007] Optionally, the distance between the one of the at least two first stirring paddles that is far from the overflow area and the bottom surface of the reaction tank is 20 mm - 50 mm.

[0008] Optionally, a second stirring mechanism is arranged in the overflow area. The second stirring mechanism includes a second stirring paddle, and the length of the second stirring paddle is greater than that of the first stirring paddle, and at least one second stirring paddle is arranged.

[0009] Optionally, the cadmium removal and purification tank further includes an upper cover, the upper cover is detachably arranged on the reaction tank, and the second stirring mechanism is arranged on the upper cover.

[0010] Optionally, an annular groove is formed on the surface of the upper cover that contacts the reaction tank, and an elastic pad is arranged in the annular groove to form a sealing structure.

[0011] Optionally, an observation window is further arranged at the lower part of the reaction tank. At least two observation windows are provided, and at least two observation windows are arranged oppositely along the radial direction of the purification area.

[0012] Optionally, the heights of at least two of the observation windows are different.

[0013] Optionally, the cadmium removal purification tank further includes a slag discharge pipe. The slag discharge pipe is arranged on the bottom surface of the reaction tank, and the slag discharge pipe is communicated with the purification area.

[0014] Beneficial effects

[0015] In the cadmium removal purification tank provided in the embodiment of the present utility model, by setting the passage area of the overflow area to be larger than that of the purification area, the thrust of the solution on the metal cadmium removal material moving from the purification area to the overflow area is reduced, and the flow rate is decreased. Then, under the action of its own gravity, the metal cadmium removal material can fall back to the purification area. In this way, the utilization rate of the metal cadmium removal material can be improved, ensuring that the content of the metal cadmium removal material in the solution in the purification area is in an excessive state compared with the theoretical dosage, which is beneficial to maintaining the stable cadmium removal effect in the purification area. At the same time, it can also reduce the content of the metal cadmium removal material in the solution in the overflow area and avoid the loss of the metal cadmium removal material. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of a cadmium removal purification tank according to an optional embodiment of the present application.

[0017] The reference signs are shown as:

[0018] 1. Reaction tank; 11. Purification area; 12. Overflow area; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. First stirring mechanism; 41. First stirring paddle; 5. Second stirring mechanism; 51. Second stirring paddle; 6. Upper cover; 7. Sealing structure; 8. Observation window; 9. Slag discharge pipe. Detailed implementation manners

[0019] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0021] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] The preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model and are not used to limit the present utility model.

[0023] See Figure 1 As shown, according to an embodiment of the present application, a cadmium removal purification tank is provided, which includes a reaction tank 1, a liquid inlet pipe 2, and a liquid outlet pipe 3. The liquid inlet pipe 2 is arranged at the lower part of the reaction tank 1, and the liquid outlet pipe 3 is arranged at the upper part of the reaction tank 1. The reaction tank 1 is a hollow structure, and a purification area 11 communicated with the liquid inlet pipe 2 and an overflow area 12 communicated with the liquid outlet pipe 3 are arranged inside. The passage area of the purification area 11 is smaller than that of the overflow area 12.

[0024] It can be understood that in the present application, since the passage area of the overflow area 12 is larger than that of the purification area 11, the thrust of the solution on the cadmium-removing metal material moving from the purification area 11 to the overflow area 12 is reduced, and the flow rate is decreased. As a result, under the action of its own gravity, the cadmium-removing metal material can fall back into the purification area 11. In this way, the utilization rate of the cadmium-removing metal material can be improved, ensuring that the content of the cadmium-removing metal material in the solution in the purification area 11 is in an excessive state compared with the theoretical dosage, which is beneficial to maintaining the stability of the cadmium-removing effect in the purification area 11. At the same time, it can also reduce the content of the cadmium-removing metal material in the solution in the overflow area 12 and avoid the loss of the cadmium-removing metal material.

[0025] Among them, the cadmium-removing purification tank includes a reaction tank 1, and the reaction tank 1 is a cadmium-removing reaction container, into which a cadmium-removing metal material and a solution to be purified can be added.

[0026] Among them, the cadmium-removing metal material can be zinc powder or other metal powders or materials with cadmium-removing functions.

[0027] Among them, the solution to be purified can be a zinc sulfate solution or other cadmium-containing solutions.

[0028] Specifically, in this embodiment, the reaction tank 1 is a reaction container for zinc powder and zinc sulfate solution. It can be understood that zinc powder has good selectivity for cadmium, can effectively remove cadmium from the solution, and has relatively little influence on the zinc ions in the zinc sulfate solution, retaining the valuable components to the greatest extent.

[0029] Among them, the cadmium-removing purification tank further includes a liquid inlet pipe 2, and the liquid inlet pipe 2 is communicated with the reaction tank 1.

[0030] Specifically, the liquid inlet pipe 2 is arranged in the lower half area of the reaction tank 1, close to the bottom surface of the reaction tank 1, and is used to inject a mixed solution of a cadmium-removing metal material and a solution to be purified into the reaction tank 1. It should be noted that the mixed solution enters the reaction tank 1 from the lower part, which can push the original liquid in the reaction tank 1 from bottom to top, forming a more uniform flow field, helping the cadmium-removing metal material and the solution to be purified to fully contact and mix. At the same time, it avoids the short-circuit flow phenomenon that may occur when the mixed solution is injected from the top or middle, that is, the mixed solution flows out of the reaction tank 1 directly without sufficient reaction, thereby improving the reaction efficiency and cadmium-removing effect. At the same time, entering from the lower part can reduce the direct impact of the mixed solution on the internal structure of the reaction tank 1, such as stirring devices, heating elements, etc., and extend the service life of the equipment. At the same time, this liquid inlet method is conducive to more precisely controlling the starting point and process of the reaction, because the solution diffuses upward from the bottom gradually, and the changes in the reaction are easier to monitor and regulate.

[0031] Among them, the cadmium-removing purification tank further includes a liquid outlet pipe 3, and the liquid outlet pipe 3 is communicated with the reaction tank 1.

[0032] Specifically, the liquid outlet pipe 3 is arranged in the upper half area of the reaction tank 1, close to the top surface of the reaction tank 1, and is used to discharge the solution after cadmium removal. It should be noted that due to the action of gravity, the impurities and precipitates after the reaction will settle downward, and the upper layer of the solution is relatively clear and pure. Discharging the liquid from the upper part can preferentially discharge the solution after cadmium removal with better quality, improving the efficiency and effect of subsequent treatment; at the same time, the impurity content in the solution after cadmium removal is relatively low, and discharging the liquid from the upper part can reduce the accumulation of impurities in the pipeline and reduce the possibility of pipeline blockage.

[0033] Among them, the reaction tank 1 is a hollow structure. The lower half area of the reaction tank 1 is the purification area 11, and the upper half area of the reaction tank 1 is the overflow area 12.

[0034] Among them, the passage area of the overflow area 12 is larger than that of the purification area 11. It should be noted that when both the overflow area 12 and the purification area 11 are cylindrical, the inner diameter of the overflow area 12 is larger than that of the purification area 11.

[0035] Specifically, in order to ensure that the metal cadmium removal material entering the reaction tank 1 through the liquid inlet pipe 2 can stably suspend in the purification area 11 of the reaction tank 1, that is, stay in the purification area 11 for a long period of time to carry out the cadmium removal reaction without drifting out from the liquid outlet pipe 3 at the upper part of the reactor, the reaction tank 1 is set as a stepped shape, and the diameter of the step corresponding to the overflow area 12 is larger than the diameter of the step corresponding to the purification area 11. It should be noted that when the liquid inlet pipe 2 continuously injects the mixed solution into the reaction tank 1, the metal cadmium removal material in the mixed solution is in force balance in the purification area 11 of the reaction tank 1 and remains in a suspended state. When the liquid inlet pipe 2 is closed, the force balance of the suspended metal cadmium removal material in the purification area 11 is broken, and it may move downward and / or upward. When the metal cadmium removal material moves upward from the purification area 11 into the overflow area 12, due to the larger passage area of the overflow area 12 than that of the purification area 11, the flow rate of the solution slows down. At this time, the thrust of the solution on the metal cadmium removal material weakens, and under the action of gravity, the metal cadmium removal material will fall back to the purification area 11 again.

[0036] Among them, it should be noted that in order to prevent the suspended metal cadmium removal material in the purification area 11 from moving downward and sinking to the bottom when the force balance is broken, a stirrer can be arranged at the bottom of the reaction tank 1.

[0037] In the above embodiment, the ratio of the inner diameter of the overflow area 12 to the inner diameter of the purification area 11 is 1.5 - 1.8.

[0038] Among them, in this embodiment, the reaction tank 1 is an inverted convex structure, and both the overflow area 12 and the purification area 11 are cylindrical.

[0039] Specifically, the inner diameter of the overflow area 12 can be 1.5 to 1.8 times the inner diameter of the purification area 11. For example, the ratio of the inner diameter of the overflow area 12 to the inner diameter of the purification area 11 is 1.5, or 1.6, or 1.7, or 1.8. It should be noted that the ratio of the inner diameter of the overflow area 12 to the inner diameter of the purification area 11 can also be other values outside the above-mentioned values, as long as the ratio of the inner diameter of the overflow area 12 to the inner diameter of the purification area 11 is 1.5 to 1.8.

[0040] In some possible embodiments provided by the present application, a first stirring mechanism 4 is arranged in the purification area 11. The first stirring mechanism 4 includes at least two first stirring paddles 41. The at least two first stirring paddles 41 are arranged at equal intervals in the vertical direction, and the length of each first stirring paddle is greater than one-half of the inner diameter of the purification area 11.

[0041] It can be understood that in the present application, by arranging the first stirring mechanism 4 in the purification area 11, it helps the metal cadmium removal material and the cadmium ions in the solution to be purified to diffuse and contact more quickly and evenly, speeds up the reaction rate, and improves the cadmium removal effect; at the same time, the at least two first stirring paddles 41 arranged at equal intervals in the vertical direction can stir the solution at different height layers, avoiding the situation of uneven stirring of the solution in the vertical direction.

[0042] Among them, the first stirring mechanism 4 includes a first stirring motor, a first stirring shaft and a first stirring paddle. The first stirring paddle is arranged on the first stirring shaft. The first stirring shaft is connected to the output end of the first stirring motor. The first stirring motor is used to drive the first stirring shaft to rotate, so as to drive the first stirring paddle to rotate through the first stirring shaft.

[0043] Specifically, the first stirring motor is arranged at the bottom of the reaction tank 1. The first stirring shaft penetrates the bottom surface of the reaction tank 1 and extends into the purification area 11. The first stirring paddle is adapted to rotate in the purification area 11.

[0044] Among them, the number of the first stirring paddles can be two, three or four, etc., and this embodiment does not make further limitations.

[0045] Specifically, in this embodiment, two first stirring paddles are arranged, and the two first stirring paddles are arranged at equal intervals in the vertical direction.

[0046] Among them, the rotation center of the first stirring paddle can be the axis line of the purification area 11.

[0047] Among them, the length of the first stirring paddle is greater than one-half of the inner diameter of the purification area 11, so that the first stirring paddle can touch a wider area of the purification area 11, reduce the stirring dead angle, and ensure that all parts of the solution can be fully stirred.

[0048] Among them, the first stirring paddle can be composed of at least two first paddle blades, and the at least two first paddle blades are evenly arranged along the circumferential direction of the first stirring shaft.

[0049] In the above embodiment, the spacing distance between the one of the at least two first stirring paddles that is far from the overflow area 12 and the bottom surface of the reaction tank 1 is 20 mm to 50 mm.

[0050] It can be understood that in the present application, there is a gap of 20 mm to 50 mm between the first stirring paddle close to the bottom surface of the reaction tank 1 and the bottom surface of the reaction tank 1, which can prevent sediment from accumulating at the bottom of the reaction tank 1 and at the same time can avoid the first stirring paddle directly contacting the bottom surface and causing wear.

[0051] Among them, the spacing distance between the one of the at least two first stirring paddles that is far from the overflow area 12 and the bottom surface of the reaction tank 1 is less than the height of the sediment. On the one hand, it helps to resuspend the substances deposited at the bottom so that they can participate in the reaction or purification process more fully. On the other hand, it can reduce the possibility of the sediment accumulating at the bottom for a long time to form a solid lump and keep it in a relatively loose state.

[0052] Specifically, the height of the sediment is greater than 50 mm. For example, the spacing distance between the one of the at least two first stirring paddles that is far from the overflow area 12 and the bottom surface of the reaction tank 1 is 20 mm, or 21 mm, or 22 mm, or 23 mm, or 24 mm, or 25 mm, or 26 mm, or 27 mm, or 28 mm, or 29 mm, or 30 mm, or 31 mm, or 32 mm, or 33 mm, or 34 mm, or 35 mm, or 36 mm, or 37 mm, or 38 mm, or 39 mm, or 40 mm, or 41 mm, or 42 mm, or 43 mm, or 44 mm, or 45 mm, or 46 mm, or 47 mm, or 48 mm, or 49 mm, or 50 mm. It should be noted that the spacing distance between the one of the at least two first stirring paddles that is far from the overflow area 12 and the bottom surface of the reaction tank 1 can also be other values outside the above values, as long as the spacing distance between the one of the at least two first stirring paddles that is far from the overflow area 12 and the bottom surface of the reaction tank 1 is 20 mm to 50 mm.

[0053] In some possible embodiments provided by the present application, a second stirring mechanism 5 is arranged in the overflow area 12. The second stirring mechanism 5 includes a second stirring paddle 51. The length of the second stirring paddle 51 is greater than the length of the first stirring paddle, and at least one second stirring paddle 51 is provided.

[0054] It can be understood that in the present application, by arranging the second stirring mechanism 5 in the overflow area 12, it can assist in driving the first stirring mechanism 4 and reduce the resistance when the first stirring mechanism 4 works.

[0055] Among them, when the second stirring mechanism 5 works, it can drive the solution in the reaction tank 1 to move, thereby reducing the resistance when the first stirring mechanism 4 works.

[0056] Among them, the second stirring mechanism 5 includes a second stirring motor, a second stirring shaft, and a second stirring paddle 51. The second stirring paddle 51 is arranged on the second stirring shaft. The second stirring shaft is connected to the output end of the second stirring motor. The second stirring motor is used to drive the second stirring shaft to rotate, so as to drive the second stirring paddle 51 to rotate through the second stirring shaft.

[0057] Specifically, the second stirring motor is arranged on the top of the reaction tank 1. The second stirring shaft penetrates the top surface of the reaction tank 1 and extends into the overflow area 12. The second stirring paddle 51 is adapted to rotate in the overflow area 12.

[0058] Among them, the second stirring paddle 51 can be provided with one, two, three, etc. This embodiment does not make further limitations.

[0059] Specifically, in this embodiment, the second stirring paddle 51 is provided with one.

[0060] Among them, the rotation center of the second stirring paddle 51 coincides with the rotation center of the first stirring paddle.

[0061] Among them, the length of the second stirring paddle 51 is greater than the length of the first stirring paddle, so as to achieve the purpose of assisting in driving the first stirring mechanism 4.

[0062] Among them, the second stirring paddle 51 can be composed of at least two second blades, and the at least two second blades are evenly arranged along the circumferential direction of the second stirring shaft.

[0063] In the above embodiment, the cadmium removal purification tank further includes an upper cover 6. The upper cover 6 is detachably arranged on the reaction tank 1, and the second stirring mechanism 5 is placed on the upper cover 6.

[0064] It can be understood that in this application, the detachable design of the upper cover 6 enables the upper cover 6 to be easily opened for operation when maintenance, repair, or replacement of the inside of the reaction tank 1, the stirring mechanism, or other components is required; at the same time, by placing the second stirring mechanism 5 on the upper cover 6, when installing and debugging the stirring mechanism, the upper cover 6 part can be processed separately without affecting the structure and existing settings of the main body of the reaction tank 1.

[0065] Among them, in order to achieve the detachable connection of the upper cover 6, the upper cover 6 and the reaction tank 1 can be connected by bolts, clamps, flanges, quick clamps, or a combination of hinges and locks, etc. This embodiment does not make further limitations.

[0066] In some possible embodiments provided by this application, the surface of the upper cover 6 in contact with the reaction tank 1 is provided with an annular groove, and an elastic pad is arranged in the annular groove to form a sealing structure 7.

[0067] It is understandable that in this application, the elastic pad can fill the tiny gap between the upper cover 6 and the reaction tank 1, effectively preventing the leakage of the reaction solution or the entry of external gases and impurities into the interior of the reaction tank 1.

[0068] Among them, the elastic pad can be an O-ring seal. For example, the elastic pad can be a high-temperature resistant O-ring seal, or a normal-temperature O-ring seal, or a low-temperature O-ring seal, which can be selected according to the actual situation.

[0069] Specifically, after the upper cover 6 is fixed on the reaction tank 1, the elastic pad is compressed in the annular groove. At this time, the elastic pad will generate a resilience force, so that the elastic pad always keeps in close contact with the surfaces of the reaction tank 1 and the upper cover 6 in contact, and even under the condition of vibration, the sealing performance can be maintained.

[0070] In some possible implementation embodiments provided by this application, an observation window 8 is further provided at the lower part of the reaction tank 1, and at least two observation windows 8 are provided, and at least two observation windows 8 are arranged oppositely along the radial direction of the purification area 11.

[0071] It is understandable that in this application, at least two observation windows 8 are arranged oppositely along the radial direction of the purification area 11, so that the interior of the reaction tank 1 can be observed from different angles to obtain more comprehensive information; at the same time, the oppositely arranged observation windows 8 can compare the situations on both sides, and it is easier to find abnormal phenomena such as uneven solution and local blockage. For example, during the reaction process, it is possible to more clearly see the accumulation of precipitates at the bottom and the distribution of impurities, which helps to judge the treatment effect in time.

[0072] Among them, the observation window 8 is arranged on the side wall of the reaction tank 1 corresponding to the purification area 11.

[0073] Among them, the observation window 8 can be made of fiberglass.

[0074] Specifically, in this embodiment, two observation windows 8 are provided.

[0075] In the above embodiment, the heights of at least two observation windows 8 are different.

[0076] It is understandable that in this application, the heights of at least two observation windows 8 are different, so that the interior of the reaction tank 1 can be observed at different height levels, and the changes and distributions of the solution in the vertical direction can be understood more comprehensively.

[0077] Among them, the high observation window 8 can observe the initial reaction situation, while the low observation window 8 can view the final state of the precipitate.

[0078] In some possible embodiments provided by the present application, the cadmium removal purification tank further includes a slag discharge pipe 9, which is arranged on the bottom surface of the reaction tank 1 and is connected to the purification area 11.

[0079] It can be understood that by arranging the slag discharge pipe 9 on the bottom surface of the reaction tank 1, the precipitates and waste residues can be directly discharged from the bottom of the reaction tank 1. Utilizing the gravity, the slag discharge process becomes smoother and more thorough; at the same time, discharging slag from the bottom reduces the agitation of the solution during the reaction and decreases the impact of the slag discharge operation on the reaction.

[0080] In the cadmium removal purification tank provided in the embodiments of the present application, in the actual production process, multiple cadmium removal purification tanks can be connected in parallel for production. First, open the valves on the liquid inlet pipes 2 of each cadmium removal purification tank, and inject the mixed solution of the metal cadmium removal material and the solution to be purified into the reaction tank 1. After the reaction tank 1 is filled with the solution, close the valves on the liquid inlet pipes 2, then start the second stirring mechanism 5 to rotate the second stirring paddle 51 blades, and then start the first stirring mechanism 4 to rotate the first stirring paddle to carry out the displacement reaction. When the reaction time reaches one hour, open the valves on the liquid outlet pipe 3 and the liquid inlet pipes 2, and use the mixed solution of the new metal cadmium removal material and the solution to be purified injected from the lower part of the reaction tank 1 to discharge the solution after cadmium removal from the upper part of the reaction tank 1. The mixed solution of the new metal cadmium removal material and the solution to be purified enters the purification area 11 to start the next round of displacement reaction. During the reaction, observe the running situation of the slag in the purification layer through the observation window 8, such as the color of the slag, the dispersion situation of the slag, the caking situation, etc. When the color of the slag becomes darker, the dispersion becomes worse, and the slag cakes, close the valves on the liquid outlet pipe 3 and the liquid inlet pipes 2 of the cadmium removal purification tank, open the valve on the slag discharge pipe 9, and carry out slag discharge through the slag discharge pipe 9. At the same time, other cadmium removal purification tanks continue to operate normally. In addition, multiple cadmium removal purification tanks can also be produced in a combined way of series and parallel connection.

[0081] Those skilled in the art can easily understand that on the premise of no conflict, the above advantageous ways can be freely combined and superimposed.

[0082] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in the technical field of the present application, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A cadmium removal and purification tank, characterized in that, It includes a reaction tank (1), a liquid inlet pipe (2) and a liquid outlet pipe (3). The liquid inlet pipe (2) is arranged at the lower part of the reaction tank (1), and the liquid outlet pipe (3) is arranged at the upper part of the reaction tank (1). The reaction tank (1) is of a hollow structure, and is internally provided with a purification area (11) communicated with the liquid inlet pipe (2) and an overflow area (12) communicated with the liquid outlet pipe (3). The passage area of the purification area (11) is smaller than that of the overflow area (12).

2. The cadmium removal and purification tank according to claim 1, wherein The ratio of the inner diameter of the overflow area (12) to the inner diameter of the purification area (11) is 1.5 - 1.

8.

3. The cadmium removal and purification tank according to claim 1, characterized in that, A first stirring mechanism (4) is arranged in the purification area (11). The first stirring mechanism (4) includes at least two first stirring paddles (41). At least two of the first stirring paddles (41) are arranged at equal intervals in the vertical direction, and the length of each first stirring paddle (41) is greater than half of the inner diameter of the purification area (11).

4. The cadmium removal and purification tank according to claim 3, characterized in that, The distance between the one of at least two first stirring paddles that is far from the overflow area (12) and the bottom surface of the reaction tank (1) is 20 mm - 50 mm.

5. The cadmium removal and purification tank according to claim 3, characterized in that, A second stirring mechanism (5) is arranged in the overflow area (12). The second stirring mechanism (5) includes a second stirring paddle (51). The length of the second stirring paddle (51) is greater than that of the first stirring paddle, and at least one second stirring paddle (51) is provided.

6. The cadmium-removing purification tank according to claim 5, characterized in that, The cadmium removal purification tank further includes an upper cover (6). The upper cover (6) is detachably arranged on the reaction tank (1), and the second stirring mechanism (5) is placed on the upper cover (6).

7. The cadmium removal and purification tank according to claim 6, wherein, The surface of the upper cover (6) that contacts the reaction tank (1) is provided with an annular groove, and an elastic pad is arranged in the annular groove to form a sealing structure (7).

8. The cadmium removal and purification tank according to claim 1, characterized in that, An observation window (8) is further arranged at the lower part of the reaction tank (1). At least two observation windows (8) are provided, and at least two observation windows (8) are arranged oppositely along the radial direction of the purification area (11).

9. The cadmium removal and purification tank according to claim 8, wherein, The heights of at least two observation windows (8) are different.

10. The cadmium removal and purification tank according to claim 1, characterized in that, The cadmium removal purification tank further includes a slag discharge pipe (9). The slag discharge pipe (9) is arranged on the bottom surface of the reaction tank (1), and the slag discharge pipe (9) is communicated with the purification area (11).

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