Electric flocculation defluorination recycling device

Abstract

The utility model provides an electric flocculation defluorination recycling device, and relates to the technical field of electric flocculation defluorination. The electric flocculation defluorination recycling device comprises a sewage tank, a pretreatment tank, an electric flocculation reaction tank, a sedimentation tank, a collection tank, a concentration tank, a filter press, a drying machine and an electrolytic aluminum reaction tank which are sequentially connected, water in the sedimentation tank is recycled, and a waste aluminum electrode plate of the electric flocculation reaction tank is sent back to the electrolytic aluminum reaction tank. The fluorine-containing sewage of the electrolytic aluminum reaction tank is sent back to the sewage pool. The solid waste generated in the electric flocculation defluorination process can be recycled, environmental pollution is avoided, and the treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrocoagulation defluorination, and more specifically, to an electrocoagulation defluorination recycling device. Background Art

[0002] Currently, electrolytic aluminum enterprises generally have processes for treating fluorine-containing rainwater and sewage. Among them, a large number of electrolytic aluminum enterprises use the electrocoagulation defluorination process to treat fluorine-containing rainwater and sewage. However, in this process, fluorine-containing solid waste will be generated, and the fluorine-containing solid waste will cause secondary pollution to the environment.

[0003] The existing electrocoagulation defluorination processes generally focus on the defluorination effect and process economy, and do not explore the reuse of solid waste generated in the process. The generated solid waste has problems such as high moisture content, secondary environmental pollution, and high entrusted disposal costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an electrocoagulation defluorination recycling device, which can recycle the solid waste generated in the electrocoagulation defluorination process, avoid environmental pollution, and reduce the treatment cost.

[0005] The embodiments of the utility model are realized through the following technical solutions:

[0006] An electrocoagulation defluorination recycling device includes a sewage tank, a pretreatment tank, an electrocoagulation reaction tank, a sedimentation tank, a collection tank, a concentration tank, a filter press, a dryer, and an electrolytic aluminum reaction tank connected in sequence. The water body of the sedimentation tank is recycled, the waste aluminum electrode plates of the electrocoagulation reaction tank are sent back to the electrolytic aluminum reaction tank, and the fluorine-containing sewage of the electrolytic aluminum reaction tank is sent back to the sewage tank.

[0007] Further, the electrocoagulation reaction tank includes a first outlet and a second outlet. The first outlet is connected to the sedimentation tank, and the second outlet is connected to the collection tank.

[0008] Further, the materials in the collection tank are transported to the concentration tank by a lift pump.

[0009] Further, the materials in the concentration tank are transported to the filter press by a screw pump.

[0010] Further, the outlet of the filter press is also connected to a wet material bin. The outlet of the wet material bin is connected to a movable feeding trough. The outlet of the movable feeding trough is connected to the inlet of the dryer. The movable feeding trough is inclined, and the inclination angle is 75 - 85°.

[0011] Furthermore, an exhaust fan is provided at the inlet of the dryer, a screw conveyor is provided inside the dryer, and a reducer is installed on the screw conveyor.

[0012] Furthermore, the outlet of the dryer is also connected to a movable dry material bin, and the movable dry material bin transports the materials to the electrolytic aluminum reaction tank.

[0013] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0014] In the utility model, the sewage pool collects the sewage and fluorine-containing rainwater generated by the electrolytic aluminum reaction tank, and the pretreatment tank pretreats the sewage in the sewage pool to remove pollutants such as BOD, COD and suspended matter in the sewage. Aluminum plates are used as electrode plates in the electrocoagulation reaction tank. The aluminum electrodes produce floccules to remove or adsorb fluoride ions in the water. A large amount of floccules are precipitated at the bottom, and scum is produced on the top. The fluorine content of both is ≥50%. The floccules and scum are separated from water in a timely and effective manner to improve the efficiency of electrocoagulation fluoride removal. The sedimentation tank discharges the floccules and scum to the collection tank for collection. The materials in the collection tank enter the concentration tank for concentration to reduce the water content in the materials. The concentrated materials enter the filter press for filtration, and the liquid becomes solid, and the water content is between 50-70%. The materials after filtration enter the dryer, and the dryer dries the materials to remove moisture. Since fluorine needs to be added during the production process of the electrolytic aluminum process, the dried fluorine-containing materials are transported to the electrolytic aluminum reaction tank for production and use, thereby achieving the purpose of recycling. At the same time, the waste aluminum electrode plates replaced in the electrocoagulation reaction tank can be directly added to the electrolytic aluminum reaction tank after natural drying to achieve the recycling of the aluminum electrode plates; the water in the sedimentation tank can be collected and recycled. In addition, the fluorine-containing wastewater generated by the electrolytic aluminum reaction tank can be returned to the sewage pool to achieve the recycling treatment of the fluorine-containing wastewater. The device can realize the recycling of solid waste, aluminum electrode plates and water bodies, and can also realize the recycling treatment of fluorine-containing wastewater, which can effectively avoid environmental pollution and reduce treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of the electro-flocculation defluorination recycling device provided in Example 1 of the utility model.

[0017] Icons: 1 - sewage pond, 2 - pretreatment pond, 3 - electrocoagulation reaction pond, 4 - sedimentation pond, 5 - collection pond, 6 - lift pump, 7 - thickening pond, 8 - screw pump, 9 - filter press, 10 - wet material bin, 11 - material conveying trough, 12 - dryer, 13 - dry material bin, 14 - electrolytic aluminum reaction tank, 31 - first outlet, 32 - second outlet. Detailed implementation mode

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this application is normally placed. It 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 cannot be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can 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 in specific situations.

[0023] Embodiment 1

[0024] As shown Figure 1 in the figure, this embodiment provides an electrocoagulation defluorination recycling device, which includes a sewage tank 1, a pretreatment tank 2, an electrocoagulation reaction tank 3, a sedimentation tank 4, a collection tank 5, a concentration tank 7, a filter press 9, a dryer 12 and an electrolytic aluminum reaction tank 14 connected in sequence. The water body of the sedimentation tank 4 is recycled. The waste aluminum electrode plates of the electrocoagulation reaction tank 3 are sent back to the electrolytic aluminum reaction tank 14, and the fluorine-containing sewage of the electrolytic aluminum reaction tank 14 is sent back to the sewage tank 1.

[0025] The sewage tank 1 collects the sewage generated by the electrolytic aluminum reaction tank 14 and the fluorine-containing rainwater. The pretreatment tank 2 pretreats the sewage in the sewage tank 1 to remove pollutants such as BOD, COD and suspended solids in the sewage. In the electrocoagulation reaction tank 3, aluminum plates are used as electrode plates. The aluminum electrodes generate flocs to remove or adsorb fluoride ions in the water. A large amount of flocs precipitate at the bottom and scum is generated at the upper part, and the fluorine content of both is ≥50%. The timely and effective separation of the flocs and scum from the water can improve the electrocoagulation defluorination efficiency. The sedimentation tank 4 discharges the flocs and scum to the collection tank 5 for collection. The materials in the collection tank 5 enter the concentration tank 7 for concentration to reduce the water content in the materials. The concentrated materials enter the filter press 9 for filtration, changing from liquid to solid, with a water content between 50-70%. The filtered materials enter the dryer 12, and the dryer 12 dries the materials to remove moisture. Since fluorine needs to be added during the production process of the electrolytic aluminum process, the dried fluorine-containing materials are transported to the electrolytic aluminum reaction tank 14 for production use, so as to achieve the purpose of recycling. The water body of the sedimentation tank 4 is collected and recycled after collection.

[0026] In the electrocoagulation defluorination process for fluorine-containing wastewater in the electrolytic aluminum industry, generally aluminum plates are selected as electrode plates. When the aluminum electrode plates are consumed (passivated) to a certain extent, the aluminum electrode plates need to be replaced. The replaced waste aluminum electrode plates can be directly added to the electrolytic aluminum reaction tank 14 after natural drying, realizing the recycling of the aluminum electrode plates. In addition, the fluorine-containing sewage generated by the electrolytic aluminum reaction tank 14 can be sent back to the sewage tank 1 to realize the recycling treatment of the fluorine-containing sewage. This device can realize the recycling of solid waste, aluminum electrode plates and water bodies, etc., and can also realize the recycling treatment of fluorine-containing sewage, which can effectively avoid environmental pollution and reduce the treatment cost.

[0027] In this embodiment, the electrocoagulation reaction tank 3 includes a first outlet 31 and a second outlet 32. The first outlet 31 is connected to the sedimentation tank 4, and the second outlet 32 is connected to the collection tank 5. The sediment at the bottom and the scum at the upper part of the electrocoagulation reaction tank 3 can be directly discharged to the collection tank 5 through the second outlet 32 for collection. The reaction liquid in the reaction tank is transported to the sedimentation tank 4 for sedimentation, and the sediment generated by the sedimentation tank 4 is then discharged to the collection tank 5. This can accelerate the collection speed of the sediment and scum.

[0028] In this embodiment, the materials in the collection tank 5 are transported to the concentration tank 7 by a lift pump 6. The lift pump 6 lifts the materials to the concentration tank 7, which can accelerate the concentration efficiency.

[0029] In this embodiment, the materials in the concentration tank 7 are transported to the filter press 9 by a screw pump 8. Pressurizing the concentrated materials through the screw pump 8 and feeding them into the filter press 9 can achieve rapid dehydration.

[0030] In this embodiment, the outlet of the filter press 9 is also connected to a wet material bin 10. The outlet of the wet material bin 10 is connected to a movable material conveying trough 11. The outlet of the movable material conveying trough 11 is connected to the inlet of the dryer 12. The movable material conveying trough 11 is inclined at an angle of 75 - 85°. After filtration, the fluorine-containing materials enter the wet material bin 10. By electrically adjusting the opening degree of the bin door of the wet material bin 10 and cooperating with the inclined movable material conveying trough 11, the materials can quickly enter the dryer 12 along the inclined direction, which can effectively reduce the labor intensity and completely avoid manual shoveling of materials.

[0031] In this embodiment, a suction fan is provided at the inlet of the dryer 12. A screw conveyor is provided inside the dryer 12, and a speed reducer is installed on the screw conveyor. The materials in the wet material bin 10 enter the dryer 12. Since the materials are viscous, in a cake shape, and have a high moisture content, they are rolled by the screw conveyor. The speed reducer is used to adjust the screw conveyor, feeding forward and discharging in reverse. Electric heating is used as the heat source. Since hydrogen fluoride gas will be formed when aluminum fluoride is at a temperature > 300°C, the dryer 12 can be equipped with an automatic temperature control system, and the drying temperature ≤ 200°C. During the drying process, the suction fan is used to extract moisture, enabling the materials to be quickly dried.

[0032] In this embodiment, the outlet of the dryer 12 is also connected to a movable dry material bin 13. The movable dry material bin 13 transports the materials to the electrolytic aluminum reaction tank 14. The movable dry material bin 13 is used to collect the dried materials and then send them for use in electrolytic aluminum production, achieving the purpose of recycling.

[0033] The working principle of an electrocoagulation defluorination recycling device is as follows: The sewage tank 1 collects the sewage generated by the electrolytic aluminum reaction tank 14 and the fluorine-containing rainwater. The sewage in the sewage tank 1 enters the pretreatment tank 2 to remove pollutants such as BOD, COD, and suspended solids in the sewage. The pretreated sewage enters the electrocoagulation reaction tank 3 to remove or adsorb fluoride ions in the water. A large amount of flocculants precipitate at the bottom, and scum is generated at the top. The flocculants and scum enter the collection tank 5, and the reaction liquid enters the sedimentation tank 4. The sediment in the sedimentation tank 4 also enters the collection tank 5. The lift pump 6 lifts the materials in the collection tank 5 to the concentration tank 7 for concentration. The concentrated materials are pressurized by the screw pump 8 and enter the filter press 9 for filtration. The fluorine-containing materials after filtration enter the wet material bin 10. By electrically adjusting the opening of the bin door of the wet material bin 10 and cooperating with the inclined movable feeding trough 11, the materials quickly enter the dryer 12 along the inclined direction for drying. The materials are fed in the forward rotation and discharged in the reverse rotation. The dried materials are collected in the movable dry material bin 13, and the movable dry material bin 13 sends the materials to the electrolytic aluminum reaction tank 14 to realize the recycling of fluorine-containing solid materials.

[0034] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electro-flocculation defluorination recycling device, characterized in that: The method comprises a sewage pool, a pretreatment pool, an electrocoagulation reaction pool, a sedimentation pool, a collection pool, a concentration pool, a filter press, a dryer and an electrolytic aluminum reaction tank which are connected in sequence. The water in the sedimentation pool is recycled, the waste aluminum electrode plates of the electrocoagulation reaction pool are returned to the electrolytic aluminum reaction tank, and the fluorine-containing wastewater of the electrolytic aluminum reaction tank is returned to the sewage pool.

2. The electro-flocculation defluorination recycling device according to claim 1, characterized in that: The electric flocculation reaction tank comprises a first outlet and a second outlet, wherein the first outlet is connected to the sedimentation tank, and the second outlet is connected to the collection tank.

3. The electro-flocculation defluorination recycling device according to claim 1, characterized in that: The material in the collecting tank is transported to the concentrating tank through a lifting pump.

4. The electro-flocculation defluorination recycling device according to claim 1, characterized in that: The material in the concentration tank is transported to the filter press via a screw pump.

5. The electro-flocculation defluorination recycling device according to claim 1, characterized in that: The outlet of the filter press is also connected to a wet material bin, the outlet of the wet material bin is connected to a movable feed trough, the outlet of the movable feed trough is connected to the inlet of the dryer, and the movable feed trough is inclined with an inclination angle of 75-85°.

6. The electro-flocculation defluorination recycling device according to claim 5, characterized in that: An exhaust fan is arranged at the inlet of the dryer, a screw conveyor is arranged inside the dryer, and a reducer is installed on the screw conveyor.

7. The electro-flocculation defluorination recycling device according to claim 1, characterized in that: The outlet of the dryer is also connected to a movable dry material bin, and the movable dry material bin transports the materials to the electrolytic aluminum reaction tank.

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